Re: [CAD_CAM_EDM_DRO] mini-mill converson data

On Sat, 28 Jun 2003 15:59:43 -0000, you wrote:

>Hi,
>
>I am looking for data on converting a mini-mill to steppers.
>
>can anyone offer some links ? or recomendations on stepper sizes ?

Direct conversion generally recommends using 200-300 in-oz for X and
Y, and 300-400 for Z. Changing to ball screws will significantly
reduce this, but up your cost.

>
>I was thinking of starting with some NEM34's 150 in-oz because I have
>them and could always swap out for larger units.

If you can find dual shaft models, you can preserve the manual modes,
otherwise, you might consider some sort of coupler mechanism to give
you manual, but it's going to be messy, I think.

>
>Also, what is the best way to automate the Z axis ?
>

Best thing I've heard of is an acme thread down the middle of the
column, seems to be more balanced that way. Also, I've heard of
putting the thread on the right hand side of the mill column. Left
hand side will do if you remove the tension arm and go to a gas lift
system, or counterbalance. You could try to drive the fine feed knob,
which sounds good, but there's a lot of backlash in that system.

Harvey
(who might just do that one day....)

>Dave
>
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