Re: Dual Belt Pulley System

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "eastcarolinamortgageplanners" <eastcarolinamortgageplanners@...> wrote:

>
> I've been thinking about machining a new set of pulleys incorporating 2 belts instead of one for my CNC mill. I have found that if I miscalculate and try to hog to much metal, the belt slips and the cutter stops, either breaking the endmill, or marking up my work piece and knocking the mill out of tram. Not to mention I hate to hear the steppers trying to spin when everything is bound up!
> Anybody had any experience, or found any solutions? I'm sure a dual belt pulley will place more stress on the mill, but would like to have some input before proceeding. Thanks, Gray Watts
>

Gray,

It would seem to me that unless your machine has a known weakness with belt slippage, that going to dual belts is really not fixing the issues.

Letting a belt slip is a good "fuse" to protect the motor. Eliminating that fuse could lead to even more expensive failures. A better approach would seem to be to understand the machine's capacity and then program the part within those limits.

But, if you are determined to increase the carrying capacity of the belt drive, you may want to consider going to a toothed belt instead. Lots of messages from years ago on how to make your own toothed belt pulleys. Not sure what the belt series is called, but there is one that has rounded teeth. So the pulley can be made by drilling a series of holes and then turning off the outside until only half holes remain. A toothed belt is what is used on our 20 HP Haas spindle.

Thanks,
Tim Goldstein
A2Z Corp
A2Z CNC division
3955 S Mariposa St
Englewood CO 80110
720 833-9300
Toll Free 877 754-7465

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