Re: Gear question

In article <MPG.1ec2642ed4b4123598974a@xxxxxxxxxxxxxxxxxxxxx>,
Ned Simmons <news@xxxxxxxxxx> wrote:

In article <prestwhich-A893D3.22171602052006@xxxxxxxxxxxxxxxxx>,
prestwhich@xxxxxxxxxxxxx says...
I previously inquired about stepper motor control, and it looks like
we're stuck with using steppers even though I personally don't see why.
So I guess I'll be learning more about that and may have more questions
later. Thanks to all who responded to that thread.

For now I'm working on the gearing to drive the telescoping mechanism.
The stepper shaft will be parallel to the telescoping arm. My original
plan was to use a worm on the stepper motor shaft. The worm drives a
worm gear. Pinned to the worm gear hub, on a common shaft, is a larger
diameter spur gear. The spur gear then drives a rack that is mounted to
the telescoping arm.

Could you use something from this page instead of rolling your own?
http://www.hsimotors.com/linear-actuators/index.htm

Or this? I think, though I'm not sure, these can be ordered with a
stepper and an intermediate reducer...
http://catalog.orientalmotor.com/viewitems/linear-motion--1080/lh-series-linea
r-heads?&plpver=11&forward=1&backtoname=&pane=

Ned Simmons

Thanks, Ned. The short answer is no, partly because the mechanism is
curved. My first query to this group on this project a few months back
was in search of an off-the-shelf curved linear actuator. I got some
good leads on that at the time, but the degree of customization required
made it more attractive to go the homemade route.

The prototype price tag on this one is growing by the day, but the
potential market justifies it, at least in the eyes of the customer. As
long as he keeps writing checks, I'm satisfied.

Jon
.

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