timing belts that don't cog

[oxford]

Are there timing belts that don't cog?

Do HTD belts cog less than trapezoidal toothed shaped belts?

Thanks

[RICHARD ZASTROW]

I don't think you can be absolutely free of "cogging".

The newest belts, like Gates GT2 are about state of the art right now. They have a carbon fiber belt that doesn't stretch after initial run-in.

Be sure to use a pulley with matching grooves for the belt tooth profile.

Dick Z

[DareBee]

AFAIK the GT2 is pretty much the same as the HPD and both have a miniscule amount of "cogging".
You will pay for them though.

[RICHARD ZASTROW]

Per Gates catalog "PowerGrip GT 2 belts must run in PowerGrip GT 2 sprockets. PowerGrip GT 2 belts are not compatible with PowerGrip HTD sprockets, or any other sprockets on the market."

HTD sprockets have greater clearance for the belt teeth. HTD teeth have a different profile than GT 2's which have little or no clearance. GT 2 teeth have an involute form similar to gear teeth, which makes for smoother engagement and disengagement with the sprocket.

Dick Z

Add: You may find Gates' belt/sprocket interchange brochure informative. It compares Gates belts to their own sprockets as well as others proprietary tooth forms.

[surfit]

Does anyone know where I can find the gt 2 power grip pulley tooth profile specs? I looked on thier website but they are not published. They have the O.D. and the pitch diameter but thats it.

[Al_The_Man]

Did you check out GoodYear Eagle pd style?
Goodyear® Engineered Products :: Eagle NRG
They are available at alot of suppliers.
Al.

[RICHARD ZASTROW]

Check prices on the Eagle pd's. $$$$$$$$$$$$$$$

Dick Z

[surfit]

Originally Posted by Al_The_Man Did you check out GoodYear Eagle pd style? Goodyear® Engineered Products :: Eagle NRG They are available at alot of suppliers. Al.

I want to machine the pulleys myself I plan to have a form tool made to use on a fourth axis to index the number of teeth needed.