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Lapidary / Gemstone Community Forum
March 26, 2019, 12:26:48 am
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Why wobble

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Author Topic: Why wobble  (Read 512 times)
LynxSphinx
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« on: November 10, 2010, 02:47:08 pm »

I had some nice trimmed slabs of Maury mt. Moss agate I have been eager to polish. I fired up my arbor and started the hard work. I noticed my wheel had a wobble and an uneven grind. I thought it just needed a little bit of dressing. So I though the agate was hard enough to wear the wheel down flat. That was not the case. My very important to me moss agate started to chip and flake away underneath. I was angry and decided to fix the problem before I ruined more material.
  I inspected everything and even my motor shaft. I pulled the wheel off the arbor and the arbor was straight. I started looking at the cheep plastic bushing that came with my wheel to make it fit a 5/8" 1/2" arbor. That was the problem! It was a horrible fit. The bushing is a bad design itself with a truncated shape that only makes contact on a narrow surface. I looked around on Kingsley north and some other suppliers and these bushings are on most of the wheels.
  There has got to be a better alternative. Doesn't look soo hard to make something else work better. bricks
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Taogem
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« Reply #1 on: November 10, 2010, 03:22:57 pm »

I can't say that have ever had a problem with the plastic bushings. Never a loose fit.

Here are some archived threads you can thumb through about dressing your wheel with a dressing tool.



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Steve
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« Reply #2 on: November 10, 2010, 03:25:04 pm »

George, the thread leads to the "search page"........not the threads you mentioned.  hide
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Taogem
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« Reply #3 on: November 10, 2010, 03:34:12 pm »

Hmm.. Thought I could just link to the search results page..  hide

So Linx.. You can type in "dressing stick" to that search box.. Without the quote marks.

Here is a pretty good thread.

Thanks Steve !
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Rockoteer
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« Reply #4 on: November 10, 2010, 11:01:15 pm »


I had the same problem and when the wheel starts to get out of whack it just gets worse.  So I went to the local bearing house here 'Columbia Bearing' and they fixed me up with a brass bushing.  Works GREAAAAT.

TOG
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-Gary

Of all the things I've lost..I miss my mind the most.

Whether you think you can, or you think you can't, you're probably right.
RoyKims
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« Reply #5 on: November 11, 2010, 04:59:06 pm »

what i've been using is a 5/8'' spacer with a 1/2'' hole. cut them down to size and they work great.. i'm pretty sure you can cut them..  lol
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LynxSphinx
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« Reply #6 on: November 12, 2010, 05:42:58 pm »

Yeah, I was back up in running not long after posting. I was able to make a bushing from pvc and some well eqipment tubbing. That particular arbor spins nice and smooth again. ,,,,Thanks
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johnjsgems
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« Reply #7 on: November 12, 2010, 08:58:48 pm »

The Chinese seem stingy with bushings.  If the wheel hub is 1.5" the adapter bushing should be full width (or two 3/4" bushings). 
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RoyKims
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« Reply #8 on: June 08, 2011, 06:45:41 pm »

other than the 5/8'' spacers i've also used copper pipe for the same purpose .. it's not the bushing that holds the wheel, it's the collars..  if they are not tight the bushing will wear..
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Rockoteer
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« Reply #9 on: June 09, 2011, 11:45:21 am »


But the bushing absolutely has to be a good fit....

TOG
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-Gary

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Rockoteer
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« Reply #10 on: June 24, 2011, 07:42:55 pm »


But the bushing absolutely has to be a good fit....

TOG
And I would go a step farther and say if the bushing is not a real good fit the washers are not going to straighten it up.  I could be wrong, not the first time but I don't think so. (And I don't mean to be argumentative)

TOG
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-Gary

Of all the things I've lost..I miss my mind the most.

Whether you think you can, or you think you can't, you're probably right.
RoyKims
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« Reply #11 on: June 24, 2011, 09:27:46 pm »

of course it does to center the wheel.. something else i found to fit well is a bronze bushing that goes from 3/4 - 1/2''. spacers(5/8-1/2) work well also. of course you have to cut everything to length .
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« Reply #12 on: June 25, 2011, 02:31:39 pm »


I bought one brass bushing to fit the wheel/arbor I was working with........tight fit no wobble and no worry about the washers.

TOG
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-Gary

Of all the things I've lost..I miss my mind the most.

Whether you think you can, or you think you can't, you're probably right.
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