Pillow Block problem

C

Chucketn

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I ordered what I thought were 1/2" bore bearing pillow blocks from Northern Tool. They have the extended inner race with setscrews to clamp to the shaft. I must have selected the wrong part #, because what I received have 1" bores.
I want to make a belt driven Grinding/sanding arbor with a 1/2" shaft. My question, if I make a 1" to 1/2" sleeve adaptor to put in the pillow blocks and put the 1/2" shaft in that, will I be introduceing extra wobble/vibration?
Chuck
 
Chuck,
I tink that if you turned down the spacers on a small lathe you would be fine as far as play and wobble. The issue I would have is locking the sleeve to the shaft. If you made it a press fit and turned the final outside surface while on the shaft it would be as accurate as your lathe at that point. Just a thought.
Bob
 
Have no idea of the machinery at hand, but you could turn/bore/part off a sleeve that would need to be shrunk onto the 1/2" shaft. Machining complete before partoff results in near zero runout. if the OD of the sleeve turned out to be large because of a slight miscalculation, run the shaft between centers and you will be able to hold the runout to a minimum. I wouldn't worry about vibration doing it that way.
 
If you've got 1" stock on hand to make the bushing why not just make your shaft from it. Just turn it down on the ends to 1/2" .
 
I have a short piece (5") of 1", not enough to make the entire shaft from it. I will turn a set of sleeves and heat them and freeze the shaft to get as tight a fit as possible and turn the assembly between centers. Thanks for all the replies.

Chuck
 
Aw, and :lmao:I was looking forward to handling some cold metal in the heat wave we're predicted to get this week...:lmao::lmao:

Chuck
 
I simply have an aversion to chemicals when I can do without. Plus it's a good learning experience. But of course it's your choice, Chuck.
 
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