Re: [CAD_CAM_EDM_DRO] John what are the "chinese" drives you are using

In a message dated 10/3/2006 12:49:17 P.M. Eastern Daylight Time,
jeep_32@... writes:

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.



John:

One thing I have learned about Chinese electronics is that they do tend to
"overbuild" and use much heavier traces on their PC boards. However, on the
other front, they tend to use way too small gauge with wiring so be careful if
there is any hardwiring in that drive. They often tend to use solid wire
for interconnections but if 16 gauge is needed they will use more like 20 gauge
(or the metric equivalent). Otherwise, the drives will probably work just
fine. I install a lot of Tiawanese and Chinese woodworking machinery and must
say that it performs very well and is quite reliable. That includes their
CNC machinery.



Randy Abernathy
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
E-mail: cnc002@...

I furnish technical support, repair, and other related services for your
industrial woodworking machinery. My background as Senior Service Engineer for
the SCMI Group for nearly fifteen years with factory training, combines with
my extensive background in electronics, mechanics, pneumatics, electrical and
CNC machinery to offer you needed support for your machinery. Services
include but are not limited to the following:


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