Flanged ball bearing will not fit the Z-axis motor mount

Woodworker
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by Woodworker » Thu May 01, 2014 3:18 pm

Thanks Edward, after removing the powder coat from the interior of the hole, i could not push in by hand but by putting it in the vise it went in with very little pressure.
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leem0401
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by leem0401 » Fri May 02, 2014 1:59 am

Thank you for the help! I see that this community is very helpful!

JRDM
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by JRDM » Fri May 02, 2014 11:15 pm

edwardrford wrote:Just to close the loop here:

The OD of the bearing is 22mm.
The ID of the bearing hole is 22.25mm. Tolerance for the laser is (roughly) +/- .02mm - .10mm.
The thickness of the powder coat is .08mm to .127mm.

If all is well, then it's a slip fit. If the laser cuts the hole on the small side, and the powder is on the thick side then we run into this situation.
Mine was cut well out of tolerance then. I'm seeing 22.00mm on my plate after scraping all the powder coating out of the hole, and using a 1/8" grinding bit to clean up the laser lead-in on the hole. So even if it wasn't coated, it wasn't going to fit without some help.

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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by WanderingFool » Mon May 05, 2014 7:26 am

I too had this problem, I had to sand off all the powder coat inside, and then press with a vice to get the bearing in.
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Woodworker
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by Woodworker » Mon May 05, 2014 1:58 pm

Seems like the latest batch of plates were cut out of tolerance? Or the bearing OD is larger.
BRuce - SO2 #4798 - IC's Z axis upgrade, customized Z rail and Z motor mount, spindle Dewalt 611

JRDM
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by JRDM » Wed May 07, 2014 10:46 pm

Woodworker wrote:Seems like the latest batch of plates were cut out of tolerance? Or the bearing OD is larger.
My bearing measured dead on.

SteveVeltema
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by SteveVeltema » Sun May 11, 2014 3:52 am

I ran into the same problem with the Z-axis mount today, and had to sand the hole well past the powder coat and take off a fair amount of aluminium before the bearing would fit with a serious pressing. It still required enough force that I am afraid that I may have slightly damaged the bearing housing (although the bearing still seems ok). YMMV

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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by WillAdams » Sun May 11, 2014 1:57 pm

The z-axis mounts are specked as 12ga steel --- did they change that?
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SteveVeltema
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by SteveVeltema » Tue May 13, 2014 1:36 pm

My bad, not aluminium but steel as you say. Still had to take off a a fair bit to get the bearing to press through.

HoneyBadger
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Re: Flanged ball bearing will not fit the Z-axis motor mount

Post by HoneyBadger » Wed May 14, 2014 1:24 am

Had this same problem this morning. I made a mini vise using both Z axis motors mount as well their screws and some nuts. Then, I slowly tightened the nuts down and brought the mounts together. This worked great for getting the flanged bearing into place.
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