Precision washers were causing slop: what I did to fix it

discussion of design changes / improvements / suggestions
jzhvymetal
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Joined: Thu Nov 22, 2012 1:36 am

Re: Precision washers were causing slop: what I did to fix i

Post by jzhvymetal » Mon Feb 25, 2013 5:06 am

It was never mentioned in the install instructions that the bearings have concave sides. After watching the video from openbuilds http://www.youtube.com/watch?feature=pl ... 3p89twecbQ I think I should have closer monitored the assembly of the v-wheels. Now I have to take them apart and check them. This is also a good time to check the washers.

WillAdams
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Re: Precision washers were causing slop: what I did to fix i

Post by WillAdams » Mon Feb 25, 2013 11:03 am

jzhvymetal wrote:It was never mentioned in the install instructions that the bearings have concave sides. After watching the video from openbuilds http://www.youtube.com/watch?feature=pl ... 3p89twecbQ
Nor in this thead --- is it mentioned in that video? (I'm not patient enough to watch videos).

I'm going to source one more part (a 1/2" -1/4" coupler for drive shaft upgrade) and then do a thorough tear down and rebuild w/ longer Y and double X and belts to outside and inverted and am trying to put together a checklist of things to check.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets

ejs
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Location: Pittsburgh, PA, USA
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Re: Precision washers were causing slop: what I did to fix i

Post by ejs » Mon Mar 11, 2013 1:13 am

WillAdams wrote:Would simply getting some extra precision washers, measuring them, discarding the under sized ones and stoning down the oversized ones work?

Also, what are the tolerances for the bearings? Could it be a classic case of only the people who wind up w/ a set of parts which are all under or oversize have problems?
Hi Lad, the supplied washers are speced at ±0.076 millimeters. My unfinished are consistently just shy of +0.03, making them more accurate out of the box. Finishing down the copper alloy I use takes minutes per washer. Buying extra steel washers and hoping for oversized to grind down would absolutely work, too.

~EJ
Build it better than it was built for you. And give permission for the next guy to do the same. That's how Open Source works.
ShapeOko # 497: http://bit.ly/reactshop producing the Buildlog CNC Stepper Shield

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