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MPH

Woodruf (halfmoon) Key question

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MPH
How nessary is it to use the dog eared keys instead of reg. ones in places like the BGB input shaft. The one on the B-112 been running with no set screw for who knows how long. it's a little hammered out, I have a better one but not a new one. Not available locally. Dog eared on the right.

Thanks for any info

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comet66
I'm not familiar with this particular application, but the only place I have come across the dog eared key, is when the gear it locates slid on the shaft. The moon portion of course kept the key from sliding with the gear. The ears on either side, kept the key from rocking out of the keyway when the gear was at one end or the other. I don't know if this is the only reason for this design or not. This one was in a two speed gear box on an industrial machine in a factory. I don't remember now just what my journeyman called it, (39 years ago). I hope this makes sense. If the gear stays stationary on the shaft, I don't know why you would need that style.

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D-17_Dave
The dog ears are just to help w/ th instalation of the sheave. Some applications with a somewhat loose groove will let the key roll out of the grove if not watched closely when slideing the pulley or sheave up on the shaft. Other than that there is no diff. as the pulley traps the key in place so it doesn't matter where the set screw seats on it.

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HubbardRA
The last time I replaced a dog eared key, I bought a larger size woodruff (same thickness) that was the same width as the dog ears. Then I ground the round part of the key to fit the cut in the shaft. In other words, I made a dog ear key from a larger size woodruff.

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