Thread: Re: [Emc-users] howto linear encoder (Page 3) (2024)

On Thu, 15 Nov 2012, Ralph Stirling wrote:> The AS5306 magnetic encoder module A and B outputs> will certainly connect to the the parallel port fine. You> can configure Hal to do quadrature decoding from the> parallel port, but your linear stage can't go very fast.> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.> If I recall correctly, LinuxCNC can typically read maybe> a couple thousand pulses per second from a quadrature> encoder via the parallel port, so you would be limited to> ~100-200mm/sec in speed.>> -- RalphIs there hardware to go between the encoder and the parallel port to improve the resolution and speedI see some break out boards have inputs for encoders> ________________________________________> From: Richard Ray [kqt...@gm...]> Sent: Thursday, November 15, 2012 11:36 AM> To: Enhanced Machine Controller (EMC)> Subject: Re: [Emc-users] howto linear encoder>> On Thu, 15 Nov 2012, andy pugh wrote:>>> On 15 November 2012 19:13, <kqt...@gm...> wrote:>>> How might I connect this, or something similar, via a parallel port>>> inexpensively, no MESA, to provide feedback for a stepper all running>>> linuxcnc>>>> Is it quadrature output?>>>> Yes> The "this" above was suposed to be http://wiki.makerbot.com/mle> Had a brain fart>> ------------------------------------------------------------------------------> Monitor your physical, virtual and cloud infrastructure from a single> web console. Get in-depth insight into apps, servers, databases, vmware,> SAP, cloud infrastructure, etc. Download 30-day Free Trial.> Pricing starts from $795 for 25 servers or applications!> http://p.sf.net/sfu/zoho_dev2dev_nov> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users>> ------------------------------------------------------------------------------> Monitor your physical, virtual and cloud infrastructure from a single> web console. Get in-depth insight into apps, servers, databases, vmware,> SAP, cloud infrastructure, etc. Download 30-day Free Trial.> Pricing starts from $795 for 25 servers or applications!> http://p.sf.net/sfu/zoho_dev2dev_nov> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users>

FPGA boards like those from Mesa (7I43 etc) will removethe parallel port as a limiting factor on speed,but the resolution is dependent on the encodersensor and magnet. If you want better resolution, youwould need to switch to the AS5311, which gives you512 counts per mm. I use that part with the 7I43 formy linear motors.-- Ralph________________________________________From: kqt...@gm... [kqt...@gm...]Sent: Monday, November 19, 2012 11:44 AMTo: Enhanced Machine Controller (EMC)Subject: Re: [Emc-users] howto linear encoderOn Thu, 15 Nov 2012, Ralph Stirling wrote:> The AS5306 magnetic encoder module A and B outputs> will certainly connect to the the parallel port fine. You> can configure Hal to do quadrature decoding from the> parallel port, but your linear stage can't go very fast.> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.> If I recall correctly, LinuxCNC can typically read maybe> a couple thousand pulses per second from a quadrature> encoder via the parallel port, so you would be limited to> ~100-200mm/sec in speed.>> -- RalphIs there hardware to go between the encoder and the parallel port to improve the resolution and speedI see some break out boards have inputs for encoders> ________________________________________> From: Richard Ray [kqt...@gm...]> Sent: Thursday, November 15, 2012 11:36 AM> To: Enhanced Machine Controller (EMC)> Subject: Re: [Emc-users] howto linear encoder>> On Thu, 15 Nov 2012, andy pugh wrote:>>> On 15 November 2012 19:13, <kqt...@gm...> wrote:>>> How might I connect this, or something similar, via a parallel port>>> inexpensively, no MESA, to provide feedback for a stepper all running>>> linuxcnc>>>> Is it quadrature output?>>>> Yes> The "this" above was suposed to be http://wiki.makerbot.com/mle> Had a brain fart>> ------------------------------------------------------------------------------> Monitor your physical, virtual and cloud infrastructure from a single> web console. Get in-depth insight into apps, servers, databases, vmware,> SAP, cloud infrastructure, etc. Download 30-day Free Trial.> Pricing starts from $795 for 25 servers or applications!> http://p.sf.net/sfu/zoho_dev2dev_nov> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users>> ------------------------------------------------------------------------------> Monitor your physical, virtual and cloud infrastructure from a single> web console. Get in-depth insight into apps, servers, databases, vmware,> SAP, cloud infrastructure, etc. Download 30-day Free Trial.> Pricing starts from $795 for 25 servers or applications!> http://p.sf.net/sfu/zoho_dev2dev_nov> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users>------------------------------------------------------------------------------Monitor your physical, virtual and cloud infrastructure from a singleweb console. Get in-depth insight into apps, servers, databases, vmware,SAP, cloud infrastructure, etc. Download 30-day Free Trial.Pricing starts from $795 for 25 servers or applications!http://p.sf.net/sfu/zoho_dev2dev_nov_______________________________________________Emc-users mailing listEmc...@li...https://lists.sourceforge.net/lists/listinfo/emc-users

kqt...@gm... wrote:> Is there hardware to go between the encoder and the parallel port to improve the resolution and speed> I see some break out boards have inputs for encoders> Mesa and Pico Systems have boards that will read encoders with index pulse intoLinuxCNC. These are much more than break out boards, they will do theservo or stepper control, too. These can't do anything for resolution ondigital encoders (unless the improved speed allows you to select a higherresolution on adjustable encoders.)Jon

On 12/11/2012 12:14 PM, ed wrote:> kqt...@gm... wrote:>> how stable is concrete>> i have my small mill in a spare bedroom in a wooden enclosure>> this is a old house that shifts and moves>> nothing ever stays level>> my mill is mdf so quite light>> if i set the acceleration to fast it dances around>> so my question is if i build a table and a concrete top will it remain flat and stable>> that would be a cheap way to gain rigidity and mass>>>> richard>> > Find a place that does granite counter tops and see if they have drop> out from sink cutout or a left over remnant that is big enough for your use.>> Ed.>Clever. I like the re-use of material that is so commonly available. I kept the cutout from our fake marble sink to use as a poor-man's surface table.In the meantime, Richard, have you tried adding mass to your current table using sandbags (I love ziplock bags for this kind of work!) just to see what happens? Have you tried to stiffen the legs and the table-to-leg joints?Perhaps I should back up and ask, when you say "it dances around" do you mean the whole table or just the superstructure that supports the router (or whatever), or something else?Regards,Kent

On Saturday 25 August 2012 10:34:35 Kent A. Reed did opine:> On 8/25/2012 4:29 AM, Gene Heskett wrote:> > That of course was back in a different day and time, I actually bought> > it off the display shelf of the main downtown Rapid City drug store. > > I had to sign the dangerous chemicals waver book for both it and the> > hydrochloric CP, but it was on the shelf! CVS & Rite Aid will> > probably call the DHS if you even ask about either today.> > When I was a mere lad, my local drug store was chock-a-block with useful> chemical elements and compounds. Besides doing the usual chemistry> experiments, by the time I entered high school I had made quantities of> various substances known to expand rapidly when ignited, all in the name> of amateur rocketry. From gun powder to a version of Thiokol rubber,> pretty much you name it and I made it. Almost every ingredient was> purchased off their shelves. Some of their stock items made sense to me,> others were inexplicable. I never did ask why a pharmacy would need to> carry pound containers of granulated zinc. It's no wonder they're called> "chemist shops" in many parts of the world.Sometimes its best not to ask... > I confess I went straight to the local scientific supply store to buy> some of my reagent-grade chemicals, notably acids, and labware. No> questions were ever asked. I guess the counter clerks figured if I knew> how to specify what I wanted I must know what I was doing, even though I> rode up on a bicycle!Chuckle, I rode a bike to go get parts to fix tv's and such when I was 13 or so, 35 miles one way on what was then US Highway 6 from our place north of Redfield IA to the Gifford-Brown distributer in downtown Des Moines. One of those it needed done so I did it things.> There's a current cartoon series* about two kids> named Phineas and Ferb doing incredible engineering feats, in which> Phineas is often asked by an adult "say, aren't you a little young to be> doing this?" to which Phineas replies "why, yes, yes I am." That would> have been my response too.BTDT, and it was several dozen calendars back up the log, so I wore out the t-shirt already. :-) > My enthusiasm for home rocketry dampened a bit when a friend blew off> various portions of his hands and face in an ill-considered attempt to> brew a fuel which was well known to be unstable. This stuff deserves> respect. Reminds me of my pilot-dad's remark that there are old pilots> and there are bold pilots but there are no old, bold pilots. Substitute> chemist for pilot and I think it still holds true.That it does. > Not just DHS would come a-knocking these days, what with crack labs> blowing up with some regularity.Those idiots will never learn they can't smoke a doobie around 55 gallon drums of acetone. Pisses me off when I go buy a gallon for parts cleaning etc and I get a knowing grin at the counter at Ace Hardware. > And the fertilizer stores are still open for business.Of coarse, the farmers still have to dig ditches. And I can't think of a quicker way than a string of bags, all touching each other, with a little added kerosene in the one on the end, with 1/4 stick of Alfreds finest under it, along with a cap and about a minutes worth of fuse. Light the fuse, walk about 100 feet away, cover ears & get an instant ditch. > Regards,> Kent> > *Oh the things you learn when you take care of grandkids!> Yes. And Yes.Cheers, Gene-- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!In defeat, unbeatable; in victory, unbearable.-- W. Churchill, on General Montgomery

On Sat, 2012-08-25 at 10:50 -0400, Gene Heskett wrote:> On Saturday 25 August 2012 10:34:35 Kent A. Reed did opine:> > > On 8/25/2012 4:29 AM, Gene Heskett wrote:> > > That of course was back in a different day and time, I actually bought> > > it off the display shelf of the main downtown Rapid City drug store. > > > I had to sign the dangerous chemicals waver book for both it and the> > > hydrochloric CP, but it was on the shelf! CVS & Rite Aid will> > > probably call the DHS if you even ask about either today.> > > > When I was a mere lad, my local drug store was chock-a-block with useful> > chemical elements and compounds. Besides doing the usual chemistry> > experiments, by the time I entered high school I had made quantities of> > various substances known to expand rapidly when ignited, all in the name> > of amateur rocketry. From gun powder to a version of Thiokol rubber,> > pretty much you name it and I made it. Almost every ingredient was> > purchased off their shelves. Some of their stock items made sense to me,> > others were inexplicable. I never did ask why a pharmacy would need to> > carry pound containers of granulated zinc. It's no wonder they're called> > "chemist shops" in many parts of the world.> > Sometimes its best not to ask...> > > I confess I went straight to the local scientific supply store to buy> > some of my reagent-grade chemicals, notably acids, and labware. No> > questions were ever asked. I guess the counter clerks figured if I knew> > how to specify what I wanted I must know what I was doing, even though I> > rode up on a bicycle!> > Chuckle, I rode a bike to go get parts to fix tv's and such when I was 13 > or so, 35 miles one way on what was then US Highway 6 from our place north > of Redfield IA to the Gifford-Brown distributer in downtown Des Moines. > One of those it needed done so I did it things.> > > There's a current cartoon series* about two kids> > named Phineas and Ferb doing incredible engineering feats, in which> > Phineas is often asked by an adult "say, aren't you a little young to be> > doing this?" to which Phineas replies "why, yes, yes I am." That would> > have been my response too.> > BTDT, and it was several dozen calendars back up the log, so I wore out the > t-shirt already. :-)> > > My enthusiasm for home rocketry dampened a bit when a friend blew off> > various portions of his hands and face in an ill-considered attempt to> > brew a fuel which was well known to be unstable. This stuff deserves> > respect. Reminds me of my pilot-dad's remark that there are old pilots> > and there are bold pilots but there are no old, bold pilots. Substitute> > chemist for pilot and I think it still holds true.> > That it does.> > > Not just DHS would come a-knocking these days, what with crack labs> > blowing up with some regularity.> > Those idiots will never learn they can't smoke a doobie around 55 gallon > drums of acetone. Pisses me off when I go buy a gallon for parts cleaning > etc and I get a knowing grin at the counter at Ace Hardware.> > > And the fertilizer stores are still open for business.> > Of coarse, the farmers still have to dig ditches. And I can't think of a > quicker way than a string of bags, all touching each other, with a little > added kerosene in the one on the end, with 1/4 stick of Alfreds finest > under it, along with a cap and about a minutes worth of fuse. Light the > fuse, walk about 100 feet away, cover ears & get an instant ditch.Works well in swamp land using poly bags of ammonium nitrate-diesel.IIRC they don't have to touch....several feet of separation. Dave> > > Regards,> > Kent> > > > *Oh the things you learn when you take care of grandkids!> > > Yes. And Yes.> > Cheers, Gene> -- > "There are four boxes to be used in defense of liberty:> soap, ballot, jury, and ammo. Please use in that order."> -Ed Howdershelt (Author)> My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!> In defeat, unbeatable; in victory, unbearable.> -- W. Churchill, on General Montgomery> > ------------------------------------------------------------------------------> Live Security Virtual Conference> Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users

On 8/25/2012 11:48 AM, dave wrote:> Powdered zinc not the granulated mixed with sulfur makes a good rocket> fuel. You partially fill sections of the tube and when it goes it gets> suspended and you get kind of a dust explosion.That, of course, explains why I was searching for zinc but not why the pharmacy was selling granulated zinc. I guess I should have asked my grandmother. She was the one cooking up our home nostrums when I was a kid. Did she need a reducing agent? Did she need to generate hydrogen? Too late to ask.Regards,Kent

On 25.08.12 12:58, Kent A. Reed wrote:> On 8/25/2012 11:48 AM, dave wrote:> > Powdered zinc not the granulated mixed with sulfur makes a good rocket> > fuel. You partially fill sections of the tube and when it goes it gets> > suspended and you get kind of a dust explosion.> > That, of course, explains why I was searching for zinc but not why the > pharmacy was selling granulated zinc. I guess I should have asked my > grandmother. She was the one cooking up our home nostrums when I was a > kid. Did she need a reducing agent? Did she need to generate hydrogen? > Too late to ask.Perhaps they made their own "killed spirits" soldering flux:Zn & HCl, giving a zinc chloride solution. But a cupful of granulatedzinc would last a decade or two, unless you were manufacturing sheetbased goods.If it was for sacrificial anodes for steam engine boilers, it wouldn'tbe granulated, I figure. And I haven't heard of kitchen-scale hot-dipgalvanising. Erik-- The whole aim of practical politics is to keep the populace alarmed (and henceclamorous to be led to safety) by an endless series of hobgoblins. - H.L. Mencken

On Sat, Aug 25, 2012 at 12:18 PM, Peter C. Wallace <pc...@me...> wrote:> http://pipeline.corante.com/archives/things_i_wont_work_with/My favorite thing from this blog was a compound that is stabilized bydissolving in TNT---except that "if you heat those crystals up the twocomponents separate out, and you're left with crystals of pure CL-20soaking in liquid TNT, a situation that will heighten your awarenessof the fleeting nature of life."

On Sun, Aug 26, 2012 at 1:45 PM, Przemek Klosowski<prz...@gm...> wrote:> On Sat, Aug 25, 2012 at 12:18 PM, Peter C. Wallace <pc...@me...> wrote:>>> http://pipeline.corante.com/archives/things_i_wont_work_with/>> My favorite thing from this blog was a compound that is stabilized by> dissolving in TNT---except that "if you heat those crystals up the two> components separate out, and you're left with crystals of pure CL-20> soaking in liquid TNT, a situation that will heighten your awareness> of the fleeting nature of life."Boom. ;-)Mark

On Sunday 26 August 2012 16:43:11 Przemek Klosowski did opine:> On Sun, Aug 26, 2012 at 8:25 AM, Mark Wendt <wen...@gm...> wrote:> >>> I want somma that Hexanitrohexaazaisowurtzitane stuff...> > > > ROFL! I'd only accept it in the correct containment system. ;-)> > I think trying to contain it just makes it worse; a mili-mole of one> of the compounds he described destroyed the stainless steel dewar it> was in. The best containment system is a 100-meter rope that goes> between you and the thing :)> Cheap rope at that... :)Cheers, Gene-- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!"Gotcha, you snot-necked weenies!"-- Post Bros. Comics

A most excellent blog. His other posts are worth reading as well.Go do a search for pentaborane. -PeteOn Aug 25, 2012, at 9:18 AM, Peter C. Wallace wrote:> On Sat, 25 Aug 2012, dave wrote:> > SNIP-------------------------------------------------------------------->> >> Someplace out there ... is a website labeled something like, "things I>> wouldn't try to make in the lab". Fascinating list of unstable compounds>> compiled from the literature.>>> > > http://pipeline.corante.com/archives/things_i_wont_work_with/> >> > > Peter Wallace> Mesa Electronics> > > ------------------------------------------------------------------------------> Live Security Virtual Conference> Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-users

On Mon, Aug 27, 2012 at 2:13 AM, Peter Loron <pe...@st...> wrote:> A most excellent blog. His other posts are worth reading as well.>> Go do a search for pentaborane.>> -PeteNice nasty stuff. The F-16's EPU used hydrazine. More good stuff.Mark

Mark Wendt wrote:> On Sun, Aug 26, 2012 at 1:41 PM, Przemek Klosowski> <prz...@gm...> wrote:> >> On Sun, Aug 26, 2012 at 8:25 AM, Mark Wendt <wen...@gm...> wrote:>> >>>>> I want somma that Hexanitrohexaazaisowurtzitane stuff...>>>>> >>> ROFL! I'd only accept it in the correct containment system. ;-)>>> >> I think trying to contain it just makes it worse; a mili-mole of one>> of the compounds he described destroyed the stainless steel dewar it>> was in. The best containment system is a 100-meter rope that goes>> between you and the thing :)>> >> Yeah, but hexanitrowhatsitsname is designed to blow stuff up... ;-)>> Hexanitrostilbene? I think that is used for explosive welding of tubesheets in boilersand heat exchagers.Jon

On Mon, Aug 27, 2012 at 1:11 PM, Jon Elson <el...@pi...> wrote:> Mark Wendt wrote:>> On Sun, Aug 26, 2012 at 1:41 PM, Przemek Klosowski>> <prz...@gm...> wrote:>>>>> On Sun, Aug 26, 2012 at 8:25 AM, Mark Wendt <wen...@gm...> wrote:>>>>>>>>> I want somma that Hexanitrohexaazaisowurtzitane stuff...>>>>>>>>>> ROFL! I'd only accept it in the correct containment system. ;-)>>>>>>> I think trying to contain it just makes it worse; a mili-mole of one>>> of the compounds he described destroyed the stainless steel dewar it>>> was in. The best containment system is a 100-meter rope that goes>>> between you and the thing :)>>>>>>> Yeah, but hexanitrowhatsitsname is designed to blow stuff up... ;-)>>>>> Hexanitrostilbene? I think that is used for explosive welding of> tubesheets in boilers> and heat exchagers.>> JonNo, the stuff we were talking about is "Hexanitrohexaazaisowurtzitane."I changed it to hexanitrowhatsitsname cuz there were too many vowelsand syllables. ;-)Mark

On Sun, 2012-08-26 at 16:43 -0400, Gene Heskett wrote:> On Sunday 26 August 2012 16:43:11 Przemek Klosowski did opine:> > > On Sun, Aug 26, 2012 at 8:25 AM, Mark Wendt <wen...@gm...> wrote:> > >>> I want somma that Hexanitrohexaazaisowurtzitane stuff...> > > > > > ROFL! I'd only accept it in the correct containment system. ;-)> > > > I think trying to contain it just makes it worse; a mili-mole of one> > of the compounds he described destroyed the stainless steel dewar it> > was in. The best containment system is a 100-meter rope that goes> > between you and the thing :)> > > Cheap rope at that... :)> > Cheers, GeneHey, good way to do detonators, separate the precursors in two glassvials which break on impact. ;-)In one of the WWII sub stories the guys rigged Molotov co*cktails with acontainer of fuming nitric and a vial of sodium which broke on impact. Affixed this to a glass bottle with diesel/av-gas. Pretty muchguaranteed to wreak havoc when it was tossed. I read the comments on your wife; not good just take care of her as muchas you can. :-) Not all things are fixable. Dave

On Thursday 30 August 2012 04:31:37 dave did opine:> On Sun, 2012-08-26 at 16:43 -0400, Gene Heskett wrote:> > On Sunday 26 August 2012 16:43:11 Przemek Klosowski did opine:> > > On Sun, Aug 26, 2012 at 8:25 AM, Mark Wendt <wen...@gm...> wrote:> > > >>> I want somma that Hexanitrohexaazaisowurtzitane stuff...> > > > > > > > ROFL! I'd only accept it in the correct containment system. ;-)> > > > > > I think trying to contain it just makes it worse; a mili-mole of one> > > of the compounds he described destroyed the stainless steel dewar it> > > was in. The best containment system is a 100-meter rope that goes> > > between you and the thing :)> > > > Cheap rope at that... :)> > > > Cheers, Gene> > Hey, good way to do detonators, separate the precursors in two glass> vials which break on impact. ;-)> > In one of the WWII sub stories the guys rigged Molotov co*cktails with a> container of fuming nitric and a vial of sodium which broke on impact.> Affixed this to a glass bottle with diesel/av-gas. Pretty much> guaranteed to wreak havoc when it was tossed.I think I'd want to practice doing the shot put, to get enough distance. :)> > I read the comments on your wife; not good just take care of her as much> as you can. :-) Not all things are fixable.> So true, dammit.Thanks for the kind thoughts.> Dave> > > > > > ------------------------------------------------------------------------> ------ Live Security Virtual Conference> Exclusive live event will cover all the ways today's security and> threat landscape has changed and how IT managers can respond.> Discussions will include endpoint security, mobile security and the> latest in malware threats.> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-usersCheers, Gene-- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!A pretty woman can do anything; an ugly woman must do everything.

How might I connect this, or something similar, via a parallel port inexpensively, no MESA, to provide feedback for a stepper all running linuxcncRichard

On 15 November 2012 19:13, <kqt...@gm...> wrote:> How might I connect this, or something similar, via a parallel port> inexpensively, no MESA, to provide feedback for a stepper all running> linuxcncIs it quadrature output?-- atpIf you can't fix it, you don't own it.http://www.ifixit.com/Manifesto

On Thu, 15 Nov 2012, andy pugh wrote:> On 15 November 2012 19:13, <kqt...@gm...> wrote:>> How might I connect this, or something similar, via a parallel port>> inexpensively, no MESA, to provide feedback for a stepper all running>> linuxcnc>> Is it quadrature output?>YesThe "this" above was suposed to be http://wiki.makerbot.com/mleHad a brain fart

The AS5306 magnetic encoder module A and B outputswill certainly connect to the the parallel port fine. Youcan configure Hal to do quadrature decoding from theparallel port, but your linear stage can't go very fast.The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.If I recall correctly, LinuxCNC can typically read maybea couple thousand pulses per second from a quadratureencoder via the parallel port, so you would be limited to~100-200mm/sec in speed.-- Ralph________________________________________From: Richard Ray [kqt...@gm...]Sent: Thursday, November 15, 2012 11:36 AMTo: Enhanced Machine Controller (EMC)Subject: Re: [Emc-users] howto linear encoderOn Thu, 15 Nov 2012, andy pugh wrote:> On 15 November 2012 19:13, <kqt...@gm...> wrote:>> How might I connect this, or something similar, via a parallel port>> inexpensively, no MESA, to provide feedback for a stepper all running>> linuxcnc>> Is it quadrature output?>YesThe "this" above was suposed to be http://wiki.makerbot.com/mleHad a brain fart------------------------------------------------------------------------------Monitor your physical, virtual and cloud infrastructure from a singleweb console. Get in-depth insight into apps, servers, databases, vmware,SAP, cloud infrastructure, etc. Download 30-day Free Trial.Pricing starts from $795 for 25 servers or applications!http://p.sf.net/sfu/zoho_dev2dev_nov_______________________________________________Emc-users mailing listEmc...@li...https://lists.sourceforge.net/lists/listinfo/emc-users

On Thu, 15 Nov 2012, Ralph Stirling wrote:> The AS5306 magnetic encoder module A and B outputs> will certainly connect to the the parallel port fine. You> can configure Hal to do quadrature decoding from the> parallel port, but your linear stage can't go very fast.> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.> If I recall correctly, LinuxCNC can typically read maybe> a couple thousand pulses per second from a quadrature> encoder via the parallel port, so you would be limited to> ~100-200mm/sec in speed.>That is quite adequate

On 15 November 2012 19:36, Richard Ray <kqt...@gm...> wrote:> The "this" above was suposed to be http://wiki.makerbot.com/mle> Had a brain fartSo, you need to connect it to the parallel port then run an encoder HAL module.That appears to be all there is to it.-- atpIf you can't fix it, you don't own it.http://www.ifixit.com/Manifesto

On Thu, 15 Nov 2012, andy pugh wrote:> On 15 November 2012 19:36, Richard Ray <kqt...@gm...> wrote:>>> The "this" above was suposed to be http://wiki.makerbot.com/mle>> Had a brain fart>> So, you need to connect it to the parallel port then run an encoder HAL module.> That appears to be all there is to it.>Great thanks

On Thursday 15 November 2012 15:00:09 Richard Ray did opine:> On Thu, 15 Nov 2012, andy pugh wrote:> > On 15 November 2012 19:13, <kqt...@gm...> wrote:> >> How might I connect this, or something similar, via a parallel port> >> inexpensively, no MESA, to provide feedback for a stepper all running> >> linuxcnc> > > > Is it quadrature output?> > Yes> The "this" above was suposed to be http://wiki.makerbot.com/mle> Had a brain fart>Thats great, I grabbed the eagle stuff and BOM. But I note that there is no index output on this board, so am I to assume that using the linear strip, cut to length and stuck on a rotating part, it will not generate a meaningful index pulse, and that to do that I would probably need to order a round magnetic wheel from one of the suppliers listed on the AMS page for that chip?However, I note that its companion, the on axis, magnetic rotary encoder also leaves out the index pulse that chip supplies. So other than setting up a mechanical stop, and homing to that, and converting to Christian Science so you can believe it will hold true at 2500 rpms till the next powerdown, this is not going to be usable for a spindle position control. Bummer. > ------------------------------------------------------------------------> ------ Monitor your physical, virtual and cloud infrastructure from a> single web console. Get in-depth insight into apps, servers, databases,> vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial.> Pricing starts from $795 for 25 servers or applications!> http://p.sf.net/sfu/zoho_dev2dev_nov> _______________________________________________> Emc-users mailing list> Emc...@li...> https://lists.sourceforge.net/lists/listinfo/emc-usersCheers, Gene-- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!Toddlers are the stormtroopers of the Lord of Entropy.