Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Jon Elson
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 are

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Jon Elson
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

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Martin Dobbins
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 this.

[Emc-users] It's not an ORAC, but it should do...

2015-03-01 Thread Gregg Eshelman
Picked up a JET 9x20 for only $50 last night. When did JET paint their stuff grey? I've only seen them green or off-white. Should make a decent base for CNC conversion, many 9x20's have been done. Should be able to make it at least as good as an ORAC since those are built on a Compact 8 clone

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Dave Caroline
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 tu...@hotmail.com wrote: If you are interfacing the encoder

[Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Martin Dobbins
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

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread andy pugh
On 1 March 2015 at 17:16, Martin Dobbins tu...@hotmail.com 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

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Jon Elson
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 the

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Dave Caroline
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

Re: [Emc-users] Lathe Spindle Encoder

2015-03-01 Thread Martin Dobbins
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: