Re: [CAD_CAM_EDM_DRO] Going home

Ian Wright wrote:

> Thanks everyone,
>
> Even if there are varying views in positioning of the home switch (as I
> really expected), I (and hopefully others) now have some very useful
> information on setting tool lengths etc. I quite like Smoke's idea of having
> a moving home switch but quite how I could implement that I'm not sure -
> I'll go and find my thinking cap!
>
> Jon, the motor driver are fairly basic L278/279 combinations with current
> setback and running in half step mode. The motors are surplus and, as near
> as I can tell they are about 5volt, 1.5 amp. At the moment it seems that the
> best speed I can get out of them without losing steps is 210 r.p.m. In my
> case this is taken through a 3:1 reduction to a 1mm pitch leadscrew which
> therefore gives me 70mm / min or 2.75" / min!

Well, I think its quite clear that you either have motors that are too small, or
the gear-down ratio is too high for such a fine leadscrew. Do you really
need that much reduction?

Jon