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

Yep! Looks like if you want to using gearing only to set up your lathe for
rifling, you'll have to make other (easy but not cheap) modifications.
Replace the motor with a variable speed DC system (and possibly different
drive pulleys) that will let you run the spindle at VERY slow RPM. Do I
recommend it?...NO. Will it work?...sure. Is it worth it? probably not.

There are a couple of alternatives here which we haven't...and won't (here)
that easily overcome those gearing problems.

Smoke

>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: