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+--- Thread: Keyway Bushing (/thread-241.html)
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RE: Keyway Bushing - aametalmaster - 04-08-2012
Nope no mill here at that time. I have a small arbor mill but its still in pcs on the floor...Bob
RE: Keyway Bushing - Highpower - 04-08-2012
OK... This is something you don't want to do:
Here we are, set up in the press - ready to cut a key slot.
![[Image: P4080122.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Carbide%20Grinder/P4080122.jpg)
Getting late, tired, and in a hurry to get done. I didn't put the hub back far enough in the press, and then failed to check the underside to make sure the broach would clear the hole on exit.
![[Image: P4080121.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Carbide%20Grinder/P4080121.jpg)
Needless to say, I am going to cut out more of my benchtop for more clearance. My fault though for not checking the path.
RE: Keyway Bushing - aametalmaster - 04-08-2012
Thats good.
I bent my cutter about 15* one night in a hurry but it flattened right out. I thought i was out 50 bucks...Bob
RE: Keyway Bushing - Highpower - 04-08-2012
Bob,
This is the price I paid. Original hub on the left - the replacement hub I made on the right. Notice that after my little faux-pax, I filled in the key slot with stainless steel infused epoxy. Why???
![[Image: P4080119.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Carbide%20Grinder/P4080119.jpg)
Because... when the broach hit the edge of the hole it kicked it out at an angle and proceeded to cut right through the side of one end of the hub.
![[Image: P4080120.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Carbide%20Grinder/P4080120.jpg)
After the epoxy had cured, I re-cut the keyway (straight this time...) leaving the upper portion as filler material in the tapered end. Luckily the "key" only contacts a short area in the back end of the hub where the slot was still straight with solid metal walls.
![[Image: P4080123.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Carbide%20Grinder/P4080123.jpg)
So if this little warning helps to prevent one other person from making the same mistake I did - it will have been worth it.
RE: Keyway Bushing - aametalmaster - 04-09-2012
I have one just like that. And people say you can't cut tapered keyways with a broach LOL. I used to borrow my cousins press and all he had was wooden blocks and i didn't notice the pulley sinking in on one side until it was done. Then i finished my press...Bob