Re: [CAD_CAM_EDM_DRO] g320 or g340 for mill setup?

sparkness2001 wrote:

>Heres my deal: cnc for a 10 x 40 american knee mill.
>Im at the point of selecting timing pulleys, encoders and gecko
>drives. I have .200 lead X & Y.My thought on setup is as follows: A
>2:1 pulley ratio, 250 cpr quadrature encoder,gecko g320 and mach1/2
>nc software. my calculations tell me 1 pulse = .0001" so at 25khz I
>should get a rapid of 150. is this resolution too high? should I use
>step multiplying or diferent encoder combo ? Any input would be
>appreciated.
>
>

What about motors? The motors you have determine everything else. if
you haven't
gotten the motors yet, hold off until then, as it may affect everything,
but most especially
the sprocket sizes. If you have high-torque, low-speed motors, you will
only want a
small belt reduction ratio. If you have lower-torque, high-speed
motors, you will
need a greater reduction ratio.

Do you have ballscrews? If not, the inefficiency of the Acme screws
needs to be taken
into account. What linear force do you plan to develop with this
machine? What
spindle taper, speed range and spindle HP do you have?

Jon