Re: Servo motor questions

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Randall Wink" <rwwink@...> wrote:

>
> Just a note to say that as a designer of custom machines, I've always
> provided a jack screw to do the adjustments with. Trying to move the
> motor/plate and tighten the bolts is a lot like trying to tighten an
> alternator belt with just a wrench.
>
> R. Wink

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.

cnc4me

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> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
> Sent: Friday, June 11, 2010 11:52 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo motor questions
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> cnc_4_me wrote:
> > Steve said
> >
> > "it's probably easier to slot the motor mounting holes."
> >
> >
> > Thanks for the reply.
> >
> > Do you have an educated guess on how much plus and minus travel would be
> needed for a slotted motor mount from the given center distance on the
> charts. Bridgeport sized machine.
> >
> You need much more than the tension adjustment range, to allow you to
> slip the belt over the flange on the pulley.
> 1/2" slide on the motor usually is needed to allow the belt to be
> placed. Probably 1/4" travel in the other direction will allow for any
> reasonable belt stretch.
>
> Jon
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