On Wed, 2010-09-08 at 13:07 -0500, Igor Chudov wrote:
> - Igor
> 
> 
> 
> On Wed, Sep 8, 2010 at 12:57 PM, Jon Elson <el...@pico-systems.com> wrote:
> > Igor Chudov wrote:
> >> Thanks to all for some clarifications that encouraged me to take some
> >> ginger first steps towards this (read, bought a servo motor on ebay).
> >>
> >> Guys, do you think that this servo motor will "do" to motorize the
> >> knee of my Bridgeport Interact:
> >>
> >> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390233108125
> >>
> >> This is an "Italiano servomotori", with a 15:1 gearbox and a tach. I
> >> think that it can give me about 7 ft-lbs of torque on its chain drive
> >> at 200 RPM. That should be enough to move the knee with air assist.
> >> With 1:1 transmission, it would amount to 40 IPM, probably a bit less
> >> in real life.
> >>
> > Is this just a power elevator or a real servo axis?  If servo, what will
> > you use to measure
> > W position?  Probably not good to put an encoder on the motor, between
> > the worm gear on the motor,
> > the bevel gear in the knee and the Acme screw, the backlash will be large.
> 
> Jon, good question.
> 
> I think that the heavy knee will always sit tight on the acme screw.
> 
> Other backlash may be at least repeatable. I will see. I am not
> totally averse to just putting an encoder on the knee handle shaft.
> 
> i
> 
> > Jon
I have a glass scale on my W (acme screw). It is stable to about 1 or
two tenths on the upstroke. I try to overshoot and come back when
lowering it. 

Dave
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