- 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
>
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