Re: what gear ratio ??? - more

> Let me further say, a 10:1 ratio might be best with those smallish

motors,

> to get decent machining power at typical machining speeds....

however the rapids

> might suffer. Also, to get more than 2.5:1 or 3:1 you'll need more
> than 1 stage of belt drives, which complicates things.
>
> So all in all, try the 2.5 to 3:1 first and see if that works for

you.

> Put the encoder on the motor, not the leadscrew.
>
>
> regards
> Doug Fortune
> http://www.cncKITS.com

Why does the encoder need to be on the motor? For resolution? If he
has 300 PPR encoders thats 1200 lines and 5 pitch screws he is
at .0001666666" per step when its mounted on the screw.
it's .0000555555" per step when mounted on the motor. He will need a
lot of pulses to go 100" per minute.

Or is there some other reason?

Eric