Re: [CAD_CAM_EDM_DRO] Is this too nuts to consider ?

Yes you could but it's not practical because the speed of the gear train relative to the spindle would be too fast for any normal
gearset.
Example: rifle barrel twist of 1/4 turn per foot, and you have a 10 tpi leadscrew on your lathe. The leadscrew must rotate 40
times faster than the spindle rpm. So at 100 RPM on the spindle your leadscrew is MOVIN at 4 grand!
This also means that your pushin 40 times the torque through the geartrain too.

Smoke wrote:

> Personally, I think it would be much simpler, quicker and lots cheaper to
> simply use a differnt gear ratio on one of the compound gears between the
> spindle and the gearbox.
>
> In fact if you change the gearing enough you COULD set up the lathe for
> machining real slow twists required for barrel rifling.
>
> Smoke
>
> >I want/need to cut a MUCH coarser thread than my lathe is capable of.
> >Ruminating upon possible solutions to the problem
> >
> > ( when I as younger, I used to THINK about problems, but now ... )
> >
> >it occurs to me that if I attached a stepper or servo to the lathe
> >SPINDLE ( somehow ) and suitably configured the "steps per inch"
> >parameter based upon the diameter of the material, I could cut threads
> >via CNC !
> >
> >Certainly, math errors could be a problem and it's unlikely to be
> >fast, but it SEEMS like it might work .. any comments ?
> >
> >Alan
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html