How would you cut this gear?

HSS

HSS

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This gear is on a take-up roll in an offset printing press and has broken. The gear looks more like a hole saw than a gear, but the manufacturer calls it a gear. If you were to make this, how would you go about it. The diameter is about 1 inch and slips into the end of the take-up roll. When the roll is full, it is removed from the press, and the gear is put on an empty take-up roll and starts over again, so it has to be removable.

Patrick

Photo 909 1.jpeg Photo 908.jpeg
 
I would need better pics but it looks like you could cut the teeth with a dovetail cutter if the angle is right
steve
 
Trying to figure that one out Pat., I see something that looks like part of a saw tooth and the other pic
looks like a clutch dog. If it is a clutch dog thats easy but the other pic I cant get a visual on it.
 
GK1918 said:
Trying to figure that one out Pat., I see something that looks like part of a saw tooth and the other pic
looks like a clutch dog. If it is a clutch dog thats easy but the other pic I cant get a visual on it.
Click to expand...

I agree it looks more like a one way clutch than a gear. Ray
 
GK1918 said:
Trying to figure that one out Pat., I see something that looks like part of a saw tooth and the other pic
looks like a clutch dog. If it is a clutch dog thats easy but the other pic I cant get a visual on it.
Click to expand...

No, that is the take up roll where the gear is inserted. The dogs on the roll is how the gear turns the roll. As the film is used from the new roll it is taken up on the empty take up roll. When the new roll is emptied the formerly empty roll is full, the now full roll is removed from the press, the gear pulled off of the full roll and installed on the now empty roll and placed where the now full roll was located. A new roll of film is installed in the press and the process starts over.
The gear is only 1 inch in diameter and the teeth are about .125 tall, so it would have to be a very small dovetail cutter.
I was thinking more along the line of a small grind wheel and use it kind of like sharpening a chain saw chain.
I may have to back away from this one. The operator said the manufacturer wants $750.00 for a new gear.

Pat
 
I'd set it up on a rotary table sitting in vertical mode and grind a shaper tool for it. Provided it is uniform in section across the face, that is. It's probably hardened, also, so better figure in some heat treat expense too.
 
jumps4 said:
i'll make you one for $749.00 lol
steve
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Will that include freight?

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Tony, I haven't seen this gear except what I took the picture of. I don't know if it's hollow like a hole saw or solid across the face.

Patrick
 
If they're serious about an alternate source, I'd be glad to take a look at building it. It's the kind of work my shop does. One off, specials. I'd be far more reasonably on the price.
 
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