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 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 > > > >

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

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

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

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

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 -- ___

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

[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

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

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 > > > >

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

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

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

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

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

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

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

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