John what are the "chinese" drives you are using

John Stevenson wrote:
No more spare Gecko's to hand so fitted a Chinese 80 volt 7.8 amp
drive and the machine is back up and running.One thing I have noticed is
that the Z axis on a long pecking drill cycle would always loose a few
steps and not return to home at the end of the job, could be 15 thou
out.Never really worried me as these are all thru holes but noting I did
could alter this error.Tried leading edge, traing edge, altering pulse
and dwell timing etc, all to no avail.Since fitting the Chinese drive
on, all I have done is alter the steps per inch as the Gecko is 10
microsteps and the Chinese drive is 8 but this error has dissapeared and
the axis homes every time.This machine although it was made as a CNC
shares dials on it like it's manual counterpart so I can see to a 1/4 of
a thou if there are any errors.I still feel that the crash wasn't enough
of a crash to take a drive out and I have no idea why the second drive
went after only a day and a half.Just time will tell how good these
Chinese drives are, one thing I have noticed when looking inside is that
the printed circuit from the mosfets to the screw connectors is over a
1/4" wide and very robust.
John S.
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