Hi Ronan,
On the subject of bearings for the Bridgeport, i had the same question a few days ago from someone else. I think this is the post you were referring to from 2015, from this thread :
**LINK**
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Posted by Muzzer on 17/02/2015 23:30:42:
These boys seem to be one of the main suppliers in the States for BP parts. It's helpful to know that "ABEC7" refers to the level of precision – I've learned something useful today!
The ABEC7 bearing kit seems to be $325 from them and there's a vid showing how to fit them. Can't say I'm massively impressed by the state of their workshop and their advice for setting the nut is "knock it pretty tight". Presumably that's a technical term. I love the way he "cleans" his hands at 4:55! I'm not convinced Ron Dennis would offer him a job.
All in all, it doesn't look too tricky if you can figure out how to drive the bearings on and off. I'd love to hear how you get on.
Murray
Hi Murray,
Americans like ANSI, and Europeans like ISO. So, ANSI ABEC7 = ISO P4.
Most common contact angle for match pair super precision angular contact bearings is 15 Deg. which is designated by the letter 'C' after the bearing number.
So, if JS is correct about what was fitted to the original Bridgeport, '7207CTRDULP4', then the letter C in this code means 15 Deg. contact angle, DU = duplex matched pair, L = suitable for light preload, P4 = ABEC7 precision.
NACHI – JAPAN price for the match pair 7207CDUP4 = same as above reference number = RHP/NSK reference number for the above = or better than SKF quality….probably…
, currently GBP115.00 including VAT, delivered U.K. Mainland for the NACHI brand.
In the super precision match pair world, SKF by brand is 'less regarded with desirability' than others….in our opinion.
Ketan at ARC
Edited for clarification of brands/quality, and price indication specifically for NACHI brand at time of writing.
Edited By Ketan Swali on 18/02/2015 12:04:04
Edited By Ketan Swali on 18/02/2015 12:06:38
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If so, then I was going to direct you to Simply Bearings or Bearing Boys for NACHI 7207CDUP4 (match pair), however, I was unable to get a clear cross reference whilst surfing their site. We have stopped offering a service to procure bearings which are outside our range. So, in the first instance, I would suggest you do a search to see if you can find them from a reputable U.K. general bearing stockist. If by Monday you fail to find them, at a suitable price, please email me on information@arceurotrade.co.uk and I will speak with my NACHI trade supplier and find price and availability for you.
Ketan at ARC.