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Lapidary / Gemstone Community Forum
January 20, 2019, 03:35:00 am
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Shaft diameter for 8" expando drum?

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Author Topic: Shaft diameter for 8" expando drum?  (Read 393 times)
Northstar
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« on: December 07, 2010, 05:02:33 am »

Well I have a 8" expando drum coming in the mail and I want to buy 2 pillow blocks and make an arbor for it. I was wondering what size shaft would be best and the pros and cons of the different sizes 1/2 5/8 3/4 1" shaft ?  I already have the motor so I'm just going to buy 2 pillow blocks and make an arbor. The only wheel thats going to be on this is probably going to be the expando wheel as I already have a 4 wheel arbor and 2 flat laps.
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Patrick

Michael
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« Reply #1 on: December 07, 2010, 05:18:25 am »

the thicker the shaft you use the less bounce you will have. a more rigid shaft has less wobble in it .
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Taogem
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« Reply #2 on: December 07, 2010, 06:51:15 am »

I can't really think of anything other than what Michael mentioned.

Although the closer you are with the diameter of the arbor to the hole in the expando will result in using fewer of the plastic bushings.



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Northstar
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« Reply #3 on: December 07, 2010, 07:13:05 am »

Thats what I was thinking In that case I will probably be going with 1"
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Patrick
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« Reply #4 on: December 07, 2010, 09:56:41 am »

I use 3/4" shafts on my home made lapidary equipment. It works well for me. When I built it I made sure that the heavier items - grinding wheels - were supported on either side with pillow block bearings. Of course the expando unit has to be on the unsupported end to allow changing belts.
Bob
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johnjsgems
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« Reply #5 on: December 07, 2010, 11:20:31 pm »

3/4" was pretty much standard in the old days but all wheels are made 1" .  If you are buying everything new I'd go with the 1"  for all the reasons mentioned already.
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