Re: [CAD_CAM_EDM_DRO] Re: Servo motor questions

On Sat, 12 Jun 2010 22:10:11 -0000, you wrote:

>The problem I see with a jack screw is the ability to measure tension. From what i understand timing belts have specs for tension and i think a 5M belt is 50 LBS? So i was thinking of putting a hook or something on motor to pull it with a pull scale. Well maybe if the jack screw was a finger tighten type thing it would work. Pull 50 LBS on the scale and finger tighten jack screw to hold motor in place. Other wise you would use 1 hand to hold scale, another hand to run ratchet and last hand to hold nut.

Not that simple

Over tensioning causes premature bearing failure ;)

Belt tension is measure by deflection midway between longest span.

Deflection test force (N) Newtons = force to be transmitted (N)/20

At that test force

Deflection (mm) = Drive span length/50

Good info here

http://www.hpcgears.com/technical.htm

Steve Blackmore
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