Re: [CAD_CAM_EDM_DRO] timing belt and 2 pulleys

AL:

Pulleys are on end of two acme screws 42.0156 apart.
Timing belt has trapizod teeth.
32 teeth on identical (standard/stock) pulleys.
counted 200 teeth on belt.

Robert Williams
(Moreno Valley, CA)

----- Original Message -----
From: "aaalfano" <aaalfano@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, August 31, 2002 1:27 PM
Subject: 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)
>
>
>
>
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