Bought "NEW" rails & blocks on EBAY .... maybe not NEW

[NC_jimbo]

My "NEW" HSR25s arrive with engravings (and some even scratched out and rewritten) on the bottom side of trucks in corners. Obviously hand engraved.

Engravings such as C0 and -2 and 762 on 3 of corners of all of them and then each with a unique 15M,27M,30M,38M in the last corner.

I could blissfully hope this is some kind of factory measurement but I have my
deep doubts.

Looked at ball raceways under a 80 power scope and things look real clean but I'd imagine they could appear that way if they were from a silicon fab or medical enviro. Didn't see any obvious ball scoring. No detectible play in bearings but I doubt I could feel that with just hand applied force.

[NC_jimbo]

Well let me get to the M$ question, do known brand new THK's have any kind of hand engravings on the bottom of blocks?

[vacpress]

i dont have the parts in front of me, but I do actually think some new THK stuff ive got had hand etched numbers.

i assumed these were batch number of some sort.. in addition, i do think essentally all the linear stuff ive seen from nsk, thk, iko, etc. had some sort of hand etched tracking numbers...

maybe that helps you. probably not.

[walter]

Originally Posted by NC_jimbo Well let me get to the M$ question, do known brand new THK's have any kind of hand engravings on the bottom of blocks?

They definitely do. They are custom orders for a specific company/application, sometimes they're in matched pairs, preload, etc. Measuring, matching, hand written numbers- normal procedure.

Just like buying matched tubes for your tube amp- they're hand picked and matched.

Ordinary, off the shelf THK blocks and rails are marked GK.

[lgalla]

Originally Posted by NC_jimbo View Post
Well let me get to the M$ question, do known brand new THK's have any kind of hand engravings on the bottom of blocks?
Al mine do HSR25,HSR15 andHSR27's
Larry

[NC_jimbo]

Thanks for the replies. Looks like I worried too much.