RE: [CAD_CAM_EDM_DRO] Re: A "simple" Hexapod project

The mechanical part wouldn't be too expensive. I located about 100
linear actuators that are new but only cost me $60 each. I bought one to
see what the quality was.
The ballscrew is 1" nominal with what looks like a .250 pitch. Located
on either ends are clevis and yoke but would have to be replaced with
gimbals. There is slight end play in the ballscrew but I think this
could easily be fixed by replacing the existing balls with balls that
are ~.0001 over the existing. The worm gear has a 40/1 ratio but that is
good because it would allow use of a small servo motor with encoder to
drive the actuator. As I recall these actuators were to be used on an X
ray table. Each actuator was design to lift 1380 lbs. The inner rod is
stainless and the outer sleeve is aluminum. There is some side clearance
but the sleeve could easily be machined for a close fitted bearing. I
like these because it would really reduce the time it would otherwise
take to make actuators and the prcie is good. I would think that the
actuator would be servo controlled. I can get the matching motors for
another $30 but they are just 24VDC PM brush motors wihtout encoders.
The other limiting factor is the 8" stroke may be a bit limiting.
If anyone is interested in the actuators email me off line and I will
email you some pictures in a zipped file.

Again it seems like the software is the hard part but I need to
investigate further what is out there and check out that cnc Toolkit.
Dan

-----Original Message-----
From: rainnea [mailto:rainnea@...]
Sent: Saturday, June 14, 2003 1:33 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: A "simple" Hexapod project

If I could put together the hardware for a reasonable cost then I'd
probably build a hexapod just for the fun although I'm currently
working on a hybrid design using 3 actuators to tilt the tool
platform in conjunction with 3 linear axes to position it, early
stages but has potential advantages over the 2 rotary axes I'm
currently using on my router.
If you get the hardware together then by all means use my CNC Toolkit
for the software side. It might not be very user friendly but that
could be fixed with some decent documentation and some work on the
user interface.

Regards,
Rab


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