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Bearing maintenance and specs

I realize a bearing and ballnut maintenance guide is on the way but in the meantime the specs for all the bearings and ballscrew parts would be appreciated. I know the outside linear bearings are LM12UU but is there a part number for the ballnut assembly, the seals on the ends, etc.

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I asked what the recommended lubricants are for the Boxzy but never heard back. Ken uses Super Lube. Be sure to use the Super Lube grease, not oil, on the linear bearings. According the other forums, lighter oil ruins linear bearings.

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Thanks. I had previously put some bike chain oil on in an attempt to free things up before realizing one of my linear bearings was completely shot. Probably helped dry the rest of my bearings up.Tomorrow I'll be attempting to repack and reinstall the ball nut I removed previously and will grease everything well then.

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Guides and part numbers are available here:

Trouble Shooting Resources

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By the way, on the subject of tiny set-screws that strip easily - I found that the metric allen wrenches at our local ACE hardware actually fit the cylinder set screws much better than the allen wrenches in the Boxzy kit. These are allen wrenches that are sold singly in the fastener bin area.

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The ballscrews themselves are not an off the shelf part. Only the balls can be interchanged directly, if I understood correctly. The BoXZY team can provide replacement seals for you. I'm experimenting with printing my own seals out of nylon, just to see if I can. I may even try to mill and cast a set of my own design. The team recommends this for lubing the ballscrews:

http://www.amazon.com/Sta-Lube-SL3333-An...

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I bought new balls for the ball nut although the existing ones were probably ok. Repacking the ballnut was slow painstaking work. I wear progressive lenses and ended up using a headlamp over my mouth to be able to see what I was doing. The bottom circuit is the worst. A word of warning, the setscrews that hold the two halves together are tiny and will strip easily. I wouldn't want to do this very often. I noticed there are ports for grease. Are the threads made to take a grease nipple? I replaced the one bad linear bearing with what is supposed to be a nice Japanese one. Cosmetically it looks the same. Ran out of time to test, will be doing that after work.

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They can be used for that purpose, however the BoXZY team doesn't recommend loading the grease using hydraulic pressure. The ports currently have screws internally that need to be backed out for re-greasing from the outside. I'm excited to hear how it all works out, it's impressive that you've gotten the ballscrew back together already. I can't wait to see even more of us dive deep!

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Thanks. I spotted the screws on the ports. If I understand correctly, don't use a grease gun but keep loading up the hole while moving back and forth. Not surprised as the port is right next to the wiper on the end. There are a few youtube videos of packing Linear Motion ballnuts. Basically you just line up the recirculating insert with the end of the ballscrew so that when you drop in a ball it will go down the channel to the back. As you get more in you will have to screw on the ball nut a bit to get things moving. Then back off for the next ball. When the circuit is full it will look like there is almost room for one more. I had some grease in prior to packing which helped the balls stick in the threads but didn't help with vision. I used quick grip clamps and scrap wood to support the ballscrew at a 45 degree angle while still in machine. That way the belt was still lined up when I put things together.

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Things running smoothly now.

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My Y-axis is getting crunchy. Was there a lack of grease in your assembly or was there actual ball/race/seal issues that you were able to fix. What were the symptoms you were seeing? My X-Axis is fine, but my Y-Axis is gritty and bind-y. I've already replaced the front linear bearing and now the main screw assembly seems to be having problems.

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John Hancorn will be eternally grateful.
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