Re: [CAD_CAM_EDM_DRO] Re: toothed belt

I am going to chime in here with a different opinion at the risk of
flames with what has worked for me..

I have always used the exact calculated center to center distances for
belt setups and have never had a problem with belts other than physical
damage due to wrecks , chips, etc. This includes 37Kw spindles running
twin 2" wide belts for noise reduction (another story entirely) and a
48,000# planer table driven by a 4" Ball Screw at 200IPM. I have applied
this thinking to a lot of machines with no problems.

I believe that idlers, adjustable motors, etc. not only make the system
more complicated but also provide movement that does result in loose
belts which does strip the teeth. If a belt breaks in tension in normal
service, it was undersized to start with and yes we have pulled belts in
two. With that said breaking an undersized belts is less costly and
easier to repair than a damaged screw or end thrust bearings.

This is the only approach I consider, and find it quite easy to do.

gary

Will wrote:

> Timing belts do not fail in tension, the teeth shear off. This happens
> when the belt skips from inadequate tension. You need a pulley jack to
> put enough tension on the belts unless you are using pretty small sizes.
>
> If you call Gates or any other manufacture and tell them the pulley
> sizes and the belt length they will be happy to tell you the correct
> tension. Tension is measured by deflection at the center of the belt
> at a given force.
>
> BTW Gates will also help you pick pulley sizes, belt lengths and
> center distances if you give them the HP to be transmitted.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>, Jack Ensor <jensor@...> wrote:
> >
> > Does anyone know how to determine the necessary tension to set up on a
> > tooth belt?
> > Jensor
> >
>
>

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