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SGTShop
02-19-2014, 06:03 PM
I am noticing, visuallly, a lot of spindle runout in a Mikini 1610L that is infrequently used for prototyping. I feel a small amount of play if I wriggle the bottom of the spindle in the x-y plane. My conclusion is that the spindle bearings need replacement. Can anyone help with bearing part numbers or sizes? (The user manual indicates they are P4 (ABEC-7) precision tolerance.) If I find replacement bearings, will reassembly result in the same preload? Is there a preload that must be satisfied? I am assuming that Mikini is out of business based on their lack of a website (correct me if I'm wrong).
Thanks!
Scott

slowtwitch
02-20-2014, 09:33 AM
Hi, Here are the bearings....

7004 CYDUP4 Nachi High Speed Bearing ABEC 7 Japan | eBay (http://www.ebay.com/itm/360255114648?_trksid=p2055120.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)

7007 CYDUP4 Nachi High Speed Bearing ABEC 7 Japan | eBay (http://www.ebay.com/itm/360255115488?_trksid=p2055120.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)

I'm probably going to do my spindle soon...I just don't trust what Mikini may have put in there :)

SGTShop
02-20-2014, 10:30 AM
Thanks very much for the info!
Since I posted my question, I did some more digging and came up with a slightly different answer:
7006 P4 (ABEC-7) (2 upper bearings)
7007 P4 (ABEC-7) (2 lower bearings)
Might be model year specific. Ours was made in 2009. My bearing info comes from
http://www.cnczone.com/forums/benchtop_machines/76370-runout_tools_sx3_x3_owners-print.html?pp=40
and also a blog entry from roberto123
CNCzone.com- The Largest Forums for CNC Professional and Hobbyist alike! - roberto123 - Blogs (http://www.cnczone.com/forums/blogs/roberto123/)
Best,
Scott

slowtwitch
02-20-2014, 11:00 AM
Thanks very much for the info!
Since I posted my question, I did some more digging and came up with a slightly different answer:
7006 P4 (ABEC-7) (2 upper bearings)
7007 P4 (ABEC-7) (2 lower bearings)
Might be model year specific. Ours was made in 2009. My bearing info comes from
http://www.cnczone.com/forums/benchtop_machines/76370-runout_tools_sx3_x3_owners-print.html?pp=40
and also a blog entry from roberto123
CNCzone.com- The Largest Forums for CNC Professional and Hobbyist alike! - roberto123 - Blogs (http://www.cnczone.com/forums/blogs/roberto123/)
Best,
Scott

My apologies, your right on the bearing numbers. I also found Allen's post in his VFD and Ac motor replacement post (page 16 post #183) to verify them...

Thanks for double checking, I would have bought the wrong bearing set..... this old age stuff sucks ...lol

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06-28-2014, 04:46 AM
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