What bearings to use in Bridgeport spindles

Ccould someone remind me what bearings (dimensions) go into lower part
of a Bridgeport spindle?
thanks
Reply to
Ignoramus5931
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Pretty sure on the r8 spindle it is 2MM207* in Fafnir
Industry std nomenclature would be 7207*
followed by a letter to designate contact angle, probably B or C
In Barden it would just be 207
SNFA has a bastard numbering system IIRC so you'd have to look it up using the boundry dimenions.
Here's a nice bearing manual in .pdf
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Reply to
PrecisionmachinisT
I've got a set of Fafnir's bought on ebay, waiting for time and motivation to install. Box says 2MM207WI DUL, additional info says 100% tested per ABMA STD 13, ABEC 9-MMV
There's a couple folks selling these and the Barden bearings on ebay. Might do well to price shop. I don't recall what I paid, but it was a lot less than list price in the MSC catalog.
Jon
Reply to
Jon Anderson
Got it. Thanks. I have two pairs of 2MM9107WI, and wonder where they go, I thought Bridgeport.
This is awesome. Thanks
Reply to
Ignoramus5931
Too small at 35X62X28--I would guess they were probably being stocked for a grinding wheel head of some sort and not for something with a through-hole.
They would also be about the right size for a low-load high-speed ball screw thrust bearing depending on actual contact angle.
You're perfectly welcome.
Reply to
PrecisionmachinisT
ABEC 9? That sounds to me like a bearing for a surface grinder. If you got it cheap, you got a real deal. If memory serves a mill usually uses something like an ABEC 3 (Use caution here, It has been something like 20 years since I checked up on bearings) and a table saw would uses the common ABEC 1. Price goes way up in between.
Roger Shoaf
Reply to
RS at work
Yes, I think that these are for Cincinnati #2 grinders.
i
Reply to
Ignoramus14275
IIRC, paid something like $125 for the pair. ABEC9 is more than I need for sure, but it's not like I paid full rate for them. Nothing like a like a little overkill...
Jon
Reply to
Jon Anderson

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