Re: [CAD_CAM_EDM_DRO] best type of hub for pulleyts

turbulatordude <dave_mucha@...> wrote:


Hi all,

looking for a XL pulley and it seems they come with a standard bore
that uses set screws, or a type called a Fairloc which looks like an
angled clamp with a screw that clamps on the shaft.

I'm not sure if the forces are too high or if these styles are fine.

I am hoping that I can get a secure clamping action and not dig the
shaft like set screws. I could file a flat if that would work. but
cannot do a keyway.

/// A little trick we use to secure a set screw upon a shaft: position the sheave then remove the set screw and run the largest drill in the tapped hole without damaging the threads and drill a small dimple just the depth of the drill point in the shaft, Then use two short set screws to secure, one on top of the either like a jamnut. Tighten the first one and then back it up with the other, works very well. My Bridgeport sheaves are retained by an 1/8" hole all the way thru the pulley and shaft then secured with a roll pin. /////

I am not sure how much pressure the plastic pulleys can handle with
the pressed in hub.

///Depends where it is. If its on the pinion, not much. If it's on the servo, quite a bit. There should be a rating somewhere for the pulley in horsepower. Take its location in the transmission and calculate the horsepower and that will answer it.///

Any comments ?

Dave





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