Re: Going home

Hi Ian,
Put the HOME switch at the top. Five Volt steppers run on 35V
with dropping resistors in the two legs I hope! You should be able to
get 15" per minute with no problem. Make sure you set your RAMP
setting in the software.

John

--- In CAD_CAM_EDM_DRO@y..., "Ian Wright" <Ian@i...> wrote:
> Hi,
>
> This may sound like a silly question but where on the 'Z' axis would
one
> normally put a 'Home' switch? The reason I ask is because, on the
little
> mill I am making, the 'Z' axis, like the other two, has about 6" of
travel
> but, like the other two, doesn't move very fast (don't know whether
this is
> due to the computer, P266, the motors, 5volt steppers run on 35
volts, or
> EMC, but all the axes are really quite pedestrian). I assume it
would be
> safest to put the switch at the top of the axis, as far away from
the table
> as possible but, if I then have to home all the axes before starting
a job,
> this could add quite a bit to the processing time. My other thought
would be
> to put the home about half way up as the chances are that most
machining
> will take place near the bottom of the 'Z' travel. What do you think
and
> where is the home switch on your mill?
> Another thought is that I am intending to make two or three
different cutter
> heads for different purposes - a high speed spindle for engraving
and small
> machining, a bigger one for milling etc. As these will undoubtedly
sit at
> different locations on the 'Z' axis travel, is there a way in EMC to
> automatically set different zero positions or would I have to set
this up as
> a whole host of 'tool length' settings? (I assume I am right in
thinking
> that you have 'Home' away from the table but Z 0.000 where the tool
just
> touches the table?)
> Thanks,
>
> Ian
> --
> Ian W. Wright
> Sheffield UK
> www.iw63.freeserve.co.uk