Re: [CAD_CAM_EDM_DRO] timing belt and 2 pulleys

Hi Robert,
I guess that you can not adjust the motor, etc.
Is the belt that you are using a timing belt?
If yes give me the number of teeth in the large & small pulleys & the number
of teeth on the belt.
Maybe I can help you.
AL

> al... thanks for your prompt reply.
> My belt deflection is Zero...too tight. maybe I need a longer belt? If so
> what length do you recommend?
>
> Robert Williams
> (Moreno Valley, CA)
>
>
> > Hi Robert,
> > The Handbook Of Timing Belts, Chains & Friction Drives from Sterling
> > Instrument.
> > The belt Deflection should be 1/64" per inch of span. Span Length is

your

> > distance between centers.
> > 1/64 of an inch is 0.015625 Times 42.0156 (if that is your distance
> between
> > centers?) is 0.6564937 inch
> > Deflection at the center point of your 42.0156 distance at 21.0078

inchs,

> > should be about 0.6564937 inchs
> > using a steel ruler on top the belt, at 21.0078", the deflection should

be

> > 0.6564937".
> > al
> >
> > > I used wmberg.com belt length calculator:
> > > pitch dia large 5.083
> > > pitch dia small 5.083
> > > belt length 100
> > >
> > > The output... center to center distance 42.0156
> > >
> > > Using Martin 32H100SK pulleys (on shaft with bearings) and a Bando
> > 1000H100 Synchro-link belt, the belt is much too tight, so tight must

grab

> > belt with two hands to rotate pulleys. I read somewhere belt tension
> should
> > be 5 pounds. Can someone confirm calculations?
> > >
> > > Robert Williams
> > > (Moreno Valley, CA)