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 are ONLY using software to read the encoder, that is a real problem! I use various hardware to read encoders, so it is no problem, and I forget others may not do that. Jon -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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 solution might just be simpler (less fun?) 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 -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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 this. However, since I don't want or need spindle reverse (screw on chucks!), I'm thinking of trying just a single pulse to begin, or perhaps better something like this: http://linuxcnc.org/docs/html/examples/spindle.html at 6.1 where just phase A and index is used. I hope hardware setup will be easier since I won't need to get phase A-B quadrature alignment setup. If that will work initially I can make it more sophisticated as I learn more. Martin -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] It's not an ORAC, but it should do...
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 and the 9x20 is a slightly larger copy. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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 tu...@hotmail.com wrote: 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. However, since I don't want or need spindle reverse (screw on chucks!), I'm thinking of trying just a single pulse to begin, or perhaps better something like this: http://linuxcnc.org/docs/html/examples/spindle.html at 6.1 where just phase A and index is used. I hope hardware setup will be easier since I won't need to get phase A-B quadrature alignment setup. If that will work initially I can make it more sophisticated as I learn more. Martin -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[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 Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Lathe Spindle Encoder
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 would need a 1:1 belt drive or gearing to keep the spindle through-hole. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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 the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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 bodge...@gmail.com wrote: 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 would need a 1:1 belt drive or gearing to keep the spindle through-hole. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
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/sherline_encoder/ I couldn't find a cheaper one in the US. Dave, 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 solution might just be simpler (less fun?) Thank you for the replies Just to muddy the waters, there is a person posting on the Sherline list that has put together a Pic controlled large (relatively) stepper driven spindle and initial tests suggest that it outperforms the Sherline motor in terms of turning and threading. Martin -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
