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I want to know how to tolerance the straightness of a bore in a shaft properly. I thought it was cylindricity at first, but now thinking its concentricity to the outer diameter. Any help, would be much appreciated. Thanks

When bending tube using an electric bender and former; is the marked radius on the former (1/2 x 3OD), usually to the centre or the outside? Thanks, Mike

ah yes, the Zeus book, that was it! I think its a bit old school now but i'll have a look for it. Thanks!

I used to have a little old school yellow and black book that had tolerances and thread sizes etc etc... very useful! I need one and can't remember where i got it from or who sold them. Any help would be appreciated!