Re: [Emc-users] Lathe Spindle Encoder Solution

On Monday 02 September 2019 19:23:01 andy pugh wrote: > On Mon, 2 Sep 2019 at 23:37, Gene Heskett wrote: > > Maybe you have stored a cookie after visiting the german page the > > > > > other day? > > > > I haven't been to their page in ages. > > I thought you were there from a (de.) link from the

Re: [Emc-users] Lathe Spindle Encoder Solution

On Mon, 2 Sep 2019 at 23:37, Gene Heskett wrote: > Maybe you have stored a cookie after visiting the german page the > > other day? > > I haven't been to their page in ages. > I thought you were there from a (de.) link from the IRC a couple of days ago? -- atp "A motorcycle is a bicycle with a

Re: [Emc-users] Lathe Spindle Encoder Solution

On Monday 02 September 2019 17:33:38 andy pugh wrote: > On Mon, 2 Sep 2019 at 22:16, Gene Heskett wrote: > > AliExpress must be pissed at Trump, no English pages available to > > me. > > I think it's just you. > > Have you tried setting the language at the top? > yes, selecting English via the fl

Re: [Emc-users] Lathe Spindle Encoder Solution

On Mon, 2 Sep 2019 at 22:16, Gene Heskett wrote: > > AliExpress must be pissed at Trump, no English pages available to me. I think it's just you. Have you tried setting the language at the top? Maybe you have stored a cookie after visiting the german page the other day? -- atp "A motorcycle

Re: [Emc-users] Lathe Spindle Encoder Solution

On Monday 02 September 2019 16:34:03 andy pugh wrote: > Found on ALiExpress: > > https://caltsensor.aliexpress.com/store/group/Hollow-shaft-encoder/513 >333_511301496.html > > Encoders with bores up to 80mm (though those are expensive). > The 50mm and 45mm bore ones are reasonably priced. AliExpr

[Emc-users] Lathe Spindle Encoder Solution

Found on ALiExpress: https://caltsensor.aliexpress.com/store/group/Hollow-shaft-encoder/51_511301496.html Encoders with bores up to 80mm (though those are expensive). The 50mm and 45mm bore ones are reasonably priced. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is de

Re: [Emc-users] Lathe spindle encoder drive

Opps. Yes I meant an involute hob is a simple trapezoid. No curves;) Cycloidal hob is indeed a funnier shaped thing and far more difficult to make. On Tue, Dec 8, 2015 at 5:14 PM, Dave Caroline wrote: > Hobs can be ground to generate cycloidal teeth as well as involute, > the key word here is

Re: [Emc-users] Lathe spindle encoder drive

Hobs can be ground to generate cycloidal teeth as well as involute, the key word here is "generate" which is the process of making the required curve. Dave Caroline -- ___ Emc-u

Re: [Emc-users] Lathe spindle encoder drive

If you use a divider head its not hobbing. Hobs do not have epicycloidal teeth. They are trapezoidal iirc. The curved tooth comes from rotating both the hob AND the blank together to get multiple angles of attack on the cut. On Tue, Dec 8, 2015 at 2:52 PM, Peter Blodow wrote: > Andy, yes, I'v

Re: [Emc-users] Lathe spindle encoder drive

On Tuesday 08 December 2015 14:30:43 andy pugh wrote: > On 8 December 2015 at 16:31, Gene Heskett wrote: > > The pinion now would be difficult if not impossible without > > obtaining a motorized indexing head, and mounting the tool sideways. > > But that would imply slaving the indexing head to Z

Re: [Emc-users] Lathe spindle encoder drive

Andy, yes, I've seen that video. If it weren't about showing the principle, I dare say there are simpler ways to mill a hob like this. As a matter of fact, I am just now up to make a similar (but larger) hob for a lawn mower drive (but the stone age way with a divider head, for reasons of time)

Re: [Emc-users] Lathe spindle encoder drive

On 8 December 2015 at 16:31, Gene Heskett wrote: > The pinion now would be difficult if not impossible without obtaining a > motorized indexing head, and mounting the tool sideways. But that would > imply slaving the indexing head to Z. Nothing is impossible, but that > would take a very creative

Re: [Emc-users] Lathe spindle encoder drive

On Tuesday 08 December 2015 07:24:43 John Thornton wrote: > Could you "thread" that on a lathe? > > JT > > On 12/7/2015 10:17 AM, andy pugh wrote: > > On 7 December 2015 at 15:54, Sarah Armstrong > > > > wrote: > >> how did your cad turn out > > > > https://picasaweb.google.com/lh/photo/jQREjwevQ

Re: [Emc-users] Lathe spindle encoder drive

Could you "thread" that on a lathe? JT On 12/7/2015 10:17 AM, andy pugh wrote: > On 7 December 2015 at 15:54, Sarah Armstrong > wrote: >> how did your cad turn out > > https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink > --

Re: [Emc-users] Lathe spindle encoder drive

On Monday 07 December 2015 11:17:37 andy pugh wrote: > On 7 December 2015 at 15:54, Sarah Armstrong > > wrote: > > how did your cad turn out > > https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmy >PJy0liipFm0?feat=directlink Nice! Cheers, Gene Heskett -- "There are four box

Re: [Emc-users] Lathe spindle encoder drive

While the index will be in the same place, any tooth form error will affect hobbing. Must write this subject up one day. Dave -- Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app

Re: [Emc-users] Lathe spindle encoder drive

On 7 December 2015 at 16:42, Dave Caroline wrote: > Hobbing it is the easy bit, keeping the backlash and tooth form error > out much harder This might not be as critical as it seems, as the index will occur at the same point with the same gear teeth in contact every time. -- atp If you can't fi

Re: [Emc-users] Lathe spindle encoder drive

On 7 December 2015 at 16:38, Stephen Dubovsky wrote: > Makes cutting the gears really easy. The large gear can be cut w/ a form > tool on a lathe just like you were cutting any other screw and the little > one can be easily bought (or cut using conventional gear cutter and indexer) I can cut a g

Re: [Emc-users] Lathe spindle encoder drive

Hobbing it is the easy bit, keeping the backlash and tooth form error out much harder Dave Caroline -- Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R)

Re: [Emc-users] Lathe spindle encoder drive

I *THINK* if you incline your resolver gear you can use a straight cut gear. IIRC, the sum of helix angles must add up to the shaft angles. In your picture the shaft angles are 90deg so one helix is something like 80deg (the large gear) and the other is 10deg (the small gear). You can do the sam

Re: [Emc-users] Lathe spindle encoder drive

interesting Andy if we can hob one ! On 7 December 2015 at 16:17, andy pugh wrote: > On 7 December 2015 at 15:54, Sarah Armstrong > wrote: > > how did your cad turn out > > > > https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink > > -- > atp > If yo

Re: [Emc-users] Lathe spindle encoder drive

On 7 December 2015 at 15:54, Sarah Armstrong wrote: > how did your cad turn out https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -

Re: [Emc-users] Lathe spindle encoder drive

Clever. Doesn't really need to be 1:1. If the spindle makes 2, or 3, or 4 revs per each rev of the encoder it would still work just fine even for threading. A non-integer would be a problem though. On Mon, Dec 7, 2015, at 10:46 AM, andy pugh wrote: > I have a lathe with a moderately large spind

Re: [Emc-users] Lathe spindle encoder drive

this is on my todo list for my lathe too how did your cad turn out , interesting too On 7 December 2015 at 15:46, andy pugh wrote: > I have a lathe with a moderately large spindle. I want to drive an > encoder (well, actually, a resolver) at a 1:1 ratio from this. > > The obvious way is with a

[Emc-users] Lathe spindle encoder drive

I have a lathe with a moderately large spindle. I want to drive an encoder (well, actually, a resolver) at a 1:1 ratio from this. The obvious way is with a 1:1 gear set, or a belt, but that does involve really quite a large gear on the weeny resolver shaft. I have been thinking about a 200:1 worm

Re: [Emc-users] Lathe Spindle Encoder

Omron sells on Ebay for the same money. Different resolutions, you have to look around. http://www.ebay.com/itm/OMRON-Rotary-Encoder-E6B2-CWZ6C-E6B2CWZ6C-1000P-R-IND002-/301513195266?pt=LH_DefaultDomain_0&hash=item4633963f02 On Mon, Mar 2, 2015 at 11:29 AM, Andy Pugh wrote: > > > > > On 1 Mar 2

Re: [Emc-users] Lathe Spindle Encoder

On 03/02/2015 02:00 AM, Gregg Eshelman wrote: > You could use a timing belt from the motor to the spindle > then put the encoder on the motor. Do the math thing with > the pulley ratio and you can get the spindle RPM. The problem is that for multi-pass threading, you need one index pulse per rev

Re: [Emc-users] Lathe Spindle Encoder

> On 1 Mar 2015, at 22:44, Jon Elson wrote: > > Oh, yes, if you are ONLY using software to read the encoder, > that is a real problem! It isn't a disaster if you lose count at high speeds as long as you keep count at threading speeds. ---

Re: [Emc-users] Lathe Spindle Encoder

On 3/1/2015 10:53 AM, Martin Dobbins wrote: > > Jon, > > Thanks, I'm a little concerned about the count. Back of an envelope > calculations suggest that by the time I put a countershaft on the Sherline > lathe to get useful torque at a low speed it will top out at ~1700 rpm You could use a timi

Re: [Emc-users] Lathe Spindle Encoder

That physical example I showed is actually just an A plus index, it was original fitment on my Starturn cnc lathe that I upgraded to linuxcnc, even the optos are original. Screw on chucks too Dave On 01/03/2015, Martin Dobbins wrote: > > > >> > >> If you are interfacing the encoder directly thro

Re: [Emc-users] Lathe Spindle Encoder

> > > If you are interfacing the encoder directly through the > parallel port, then > Halscope could be used to check the A-B quadrature alignment. > No bulky test gear needed. > > Jon Jon, Thank you, all I have to do is learn how to use Halscope rather than buy an oscilloscope just for th

Re: [Emc-users] Lathe Spindle Encoder

On 03/01/2015 11:53 AM, Martin Dobbins wrote: > > > That was my first thought and a much less expensive method, but I concluded I > might need an oscilloscope to get A and B pulses set up correctly and then I > might have to think about what to do about debounce and decided an off the > shelf so

Re: [Emc-users] Lathe Spindle Encoder

On 03/01/2015 11:53 AM, Martin Dobbins wrote: > Jon, > > Thanks, I'm a little concerned about the count. Back of an envelope > calculations suggest that by the time I put a countershaft on the Sherline > lathe to get useful torque at a low speed it will top out at ~1700 rpm > > Oh, yes, if you a

Re: [Emc-users] Lathe Spindle Encoder

Jon, Thanks, I'm a little concerned about the count. Back of an envelope calculations suggest that by the time I put a countershaft on the Sherline lathe to get useful torque at a low speed it will top out at ~1700 rpm Andy, I'm planning to copy this person: http://www.grifftek.com/images/s

Re: [Emc-users] Lathe Spindle Encoder

If using a parallel port I would say that has a rather high count, This sort can he home brewed (48 slot) :- http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_08_04_starturn_encoder/IMG_1631.JPG and still give the through hole Dave Caroline On 01/03/2015, andy pugh wrote: > On 1 M

Re: [Emc-users] Lathe Spindle Encoder

On 1 March 2015 at 17:16, Martin Dobbins wrote: > Would this be any use as a headstock spindle encoder? It could be used, and it has an index (without which there isn't much point). But that isn't a particularly spectacular price, and the coupling is likely to not be useful. You would need a 1:1

Re: [Emc-users] Lathe Spindle Encoder

On 03/01/2015 10:16 AM, Martin Dobbins wrote: > Would this be any use as a headstock spindle encoder? > > https://www.sparkfun.com/products/11102 > > Yup, looks fine. I made sure it has the index pulse. Jon -- Dive into

[Emc-users] Lathe Spindle Encoder

Would this be any use as a headstock spindle encoder? https://www.sparkfun.com/products/11102 Martin -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 18 December 2013 19:07, Kirk Wallace wrote: > > I noticed your sensors don't have matching sensor planes? > http://wallacecompany.com/tmp/image2826.pn > g Indeed not. In fact all three are in different planes. The top ones wrap around a bevel gear

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 12/18/2013 09:11 AM, andy pugh wrote: > On 18 December 2013 16:55, Kirk Wallace wrote: > >> The >> installations I have seen so far just bed them in a glob of glue. I was >> hoping to use a more formal method. > > Mine are slotted into bores in an aluminium plate, but glue was still > involved

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 12/18/2013 10:55 AM, Kirk Wallace wrote: > On 12/17/2013 09:35 PM, Jon Elson wrote: > > ... snip >> If the gear is steel, you could use the trick I used: >> http://pico-systems.com/bridge_spindle.html > ... snip > > I ordered a batch of these Avago sensors, and now that I have them in > hand it

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

I like all the ideas and suggestions here. Many thanks to all who responded. I think I'll try these automotive gear tooth sensors, and see how that works, Digikey.ca has them available, so I can order them fairly locally. Just FYI, I do like the Acetal nut idea, will try that before going ball-sc

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 18 December 2013 16:55, Kirk Wallace wrote: > The > installations I have seen so far just bed them in a glob of glue. I was > hoping to use a more formal method. Mine are slotted into bores in an aluminium plate, but glue was still involved: https://picasaweb.google.com/lh/photo/pyvsRqIQpQalC

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 12/17/2013 09:35 PM, Jon Elson wrote: ... snip > If the gear is steel, you could use the trick I used: > http://pico-systems.com/bridge_spindle.html ... snip I ordered a batch of these Avago sensors, and now that I have them in hand it looks like they are not the easiest sensors to mount. Th

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 18 December 2013 03:37, John Alexander Stewart wrote: > > Was thinking that, while it was off, I could make up a large disk with > holes for the encoder. Would it be better to read off the 40 tooth gear on > the spindle?? To me, in my novice state, I'd think that was not as good, > but... I

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 18 December 2013 01:11, dave wrote: For the spindle I did something dumb which I will need to fix. Used a > 360 cpr Koyo encoder but geared it (in a moment of dullness) 2:1 so > index pulses are not unique in angular index. > That isn't necessary an impossible problem. If the ratio is exactly

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Wednesday 18 December 2013 01:16:47 John Alexander Stewart did opine: > Hi Gene - by: > > John: You need finer grained control than an index generator will ever > > > allow if you ever intend to use the G33.1 or G76 thread cutting on the > > lathe, and once I had that working, I don't know w

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

I was a little concerned that 20 teeth (80 quadrature) wouldn't be enough resolution. After cutting a couple of 0-80 and 00-90 screws on both the machines and testing with commercial nuts and examining the thread geometry under the microscope I no longer have any reservations about 80 quadrat

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 12/17/2013 09:37 PM, John Alexander Stewart wrote: > The Compact-8 does have a 40 tooth gear on the spindle. Right now spindle > pulley is off, because was doing some measurements on it for someone in > Britain who specializes in threading clutches - he needed a Compact-8 to > measure. > > Was t

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

I used the black "dummy" CD or DVD (cant remember which) that comes in a new stack of disks to make my encoder disk. I cut 20 equally spaced notches about .15 inch deep and made one of them about .45 deep for the index. I used TTL output optical interrupters to read the disk with 2 for quadrat

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tue, 2013-12-17 at 22:37 -0500, John Alexander Stewart wrote: > Hi Andy; > > Thank you for the response - I have seen your little 7x lathe cnc > conversion on a few places - well done. > > I'll readily admit to being a bit "newby" in encoders. > > The Compact-8 does have a 40 tooth gear on th

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

I wonder if the pickup from a Pertronix Ignitor electronic ignition retrofit for vehicles with breaker points ignition would work to read pulses from a gear? In the ignition kit it's used to read the very low amplitude breaker points cam on the distributor shaft. Gear teeth ought to provide a m

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

Hi Gene - by: John: You need finer grained control than an index generator will ever > allow if you ever intend to use the G33.1 or G76 thread cutting on the > lathe, and once I had that working, I don't know why I ever considered not > doing it. I presume you mean the one pulse per rev that M

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

Hi Andy; Thank you for the response - I have seen your little 7x lathe cnc conversion on a few places - well done. I'll readily admit to being a bit "newby" in encoders. The Compact-8 does have a 40 tooth gear on the spindle. Right now spindle pulley is off, because was doing some measurements o

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tuesday 17 December 2013 21:22:48 dave did opine: > On Tue, 2013-12-17 at 20:59 -0500, Gene Heskett wrote: > > On Tuesday 17 December 2013 20:51:20 dave did opine: > > > On Tue, 2013-12-17 at 18:32 -0500, John Alexander Stewart wrote: > > > > Hello all; > > > > > > > > 2014 sees me finishing u

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tue, 2013-12-17 at 20:59 -0500, Gene Heskett wrote: > On Tuesday 17 December 2013 20:51:20 dave did opine: > > > On Tue, 2013-12-17 at 18:32 -0500, John Alexander Stewart wrote: > > > Hello all; > > > > > > 2014 sees me finishing up my lathe conversion to CNC. (Emco > > > Compact-8). > > > >

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tuesday 17 December 2013 20:51:20 dave did opine: > On Tue, 2013-12-17 at 18:32 -0500, John Alexander Stewart wrote: > > Hello all; > > > > 2014 sees me finishing up my lathe conversion to CNC. (Emco > > Compact-8). > > > > I'm a bit "confused" about spindle sensors, and I do see a few > > di

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tue, 2013-12-17 at 18:32 -0500, John Alexander Stewart wrote: > Hello all; > > 2014 sees me finishing up my lathe conversion to CNC. (Emco Compact-8). > > I'm a bit "confused" about spindle sensors, and I do see a few different > designs. > > Question - if you had to do it again, what would Y

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 18 December 2013 00:21, Cecil Thomas wrote: > Andy, > This one has no index. How did you generate your index pulse? I hadn't noticed that, I can't read Chinese. That might not be the end of the world, as it could be geared to the spindle at a more convenient ratio than 1:1 and the index co

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

Andy, This one has no index. How did you generate your index pulse? Cecil Andy Pugh wrote: (Cheap eBay encoder, though not the one I used): http://www.ebay.co.uk/itm/40mm-Outer-Diameter-Incremental-Type-Photoelectric-Encoder-Rotary-Encoder-/281099904847 At that price, if you can find a way to d

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On Tuesday 17 December 2013 18:55:04 John Alexander Stewart did opine: > Hello all; > > 2014 sees me finishing up my lathe conversion to CNC. (Emco Compact-8). > > I'm a bit "confused" about spindle sensors, and I do see a few different > designs. > > Question - if you had to do it again, what

Re: [Emc-users] Lathe spindle encoder, Mesa 7i76.

On 17 December 2013 23:32, John Alexander Stewart wrote: > Question - if you had to do it again, what would YOU do for a modern > spindle encoder? > I am on the 3rd iteration of spindle encoder on my lathe, so feel well qualified opinionate. iteration 1 was a laser-printed target wrapped round

[Emc-users] Lathe spindle encoder, Mesa 7i76.

Hello all; 2014 sees me finishing up my lathe conversion to CNC. (Emco Compact-8). I'm a bit "confused" about spindle sensors, and I do see a few different designs. Question - if you had to do it again, what would YOU do for a modern spindle encoder? (trying to learn from those who have gone be

Re: [Emc-users] Lathe spindle encoder

On Thursday, April 12, 2012 06:35:38 AM Rolf Bredemeier did opine: > Hi all, > > I do not know if it is customary to thank here, but: > > many thnaks for the answers from so many users! Special thanks have to > Gene, the long message must be a lot of time, but also very > interresting. > > @Gen

[Emc-users] Lathe spindle encoder

Hi all, I do not know if it is customary to thank here, but: many thnaks for the answers from so many users! Special thanks have to Gene, the long message must be a lot of time, but also very interresting. @Gene: you wrote, your wheel hast 39 slots. But when i am count out the picture disk4.jp

Re: [Emc-users] Lathe Spindle Encoder Resolution

Chris Radek wrote: > > The quality of the velocity output depends on which encoder counter > you're using. I think the 'encoder' block is currently the best, > pluto is adequate (integer number of counts), and ppmc doesn't have > any at all (but I bet you can use ddt). I don't know about > mesa/

Re: [Emc-users] Lathe Spindle Encoder Resolution

Kirk Wallace wrote: >> Feed per revolution is based on spindle *velocity* feedback. > > Why should feed per revolution be different than threading or > electronically geared? Threading uses spindle position feedback, because threads have to be exactly repeatable from pass to pass, and the pitch

Re: [Emc-users] Lathe Spindle Encoder Resolution

On Thu, 2007-08-09 at 20:59 -0500, Chris Radek wrote: > On Thu, Aug 09, 2007 at 06:32:45PM -0700, Kirk Wallace wrote: > > What are the major points for choosing a lathe spindle encoder > > resolution? My controller has a count limit of 300k counts per second. ... snip > The quality of the velocit

Re: [Emc-users] Lathe Spindle Encoder Resolution

This puts it in a nutshell for me. Thank you. On Thu, 2007-08-09 at 21:59 -0500, Jeff Epler wrote: > When threading, the axis position is electronically geared to the > spindle position -- the index pulse is just used to place the start of > the move at the right spindle angle. > > Constant surfa

Re: [Emc-users] Lathe Spindle Encoder Resolution

When threading, the axis position is electronically geared to the spindle position -- the index pulse is just used to place the start of the move at the right spindle angle. Constant surface speed changes the *commanded* spindle speed depending on tool tip location, so unless you are doing closed-

Re: [Emc-users] Lathe Spindle Encoder Resolution

On Thu, Aug 09, 2007 at 06:32:45PM -0700, Kirk Wallace wrote: > What are the major points for choosing a lathe spindle encoder > resolution? My controller has a count limit of 300k counts per second. > Currently, my encoder has 10k pulses per revolution, so I will have an > RPM limit of 1800 RPM. S

[Emc-users] Lathe Spindle Encoder Resolution

What are the major points for choosing a lathe spindle encoder resolution? My controller has a count limit of 300k counts per second. Currently, my encoder has 10k pulses per revolution, so I will have an RPM limit of 1800 RPM. So, obviously there is an upper limit. Is there a lower limit too? I