Reamer Identification

[ManofkentParticipant @manofkent]

Hello.

I wonder if any of you clever people can help me. I have a box of reamers which were from another model engineer. However the sizes are not all obviously marked but there are other markings.

I wondered if anyone knew if there was a way (other than measuring them) to identify the sizes.

For example – a reamer I measure to be 0.278 inches (7.07mm) is marked:

T.62992

79005

RST TOOLS

Another is a Dormer C4?

Marked T37725

P/N59164

RST TOOLS

On this one the reamer is exactly 0.150 inches 3.78mm – could be 3.7725mm I suppose like the marking? (the shank is 0.250 inches).

They are all marked "RST TOOLS".

I guess they could be specially made items, but it would be nice to know if the numbering helps.

Many thanks in advance

john

[ManofkentParticipant @manofkent]

[CirclipParticipant @circlip]

Would question where he got them from. "T" designations suggest they could have been "Specials" made for a manufacturing company.

Regards Ian.

[ManofkentParticipant @manofkent]

Thanks Ian.

yes I guess they are specials – I think I have come up against some of these before from a diemaker in the car industry.

I am sure some are for a types of fit – so for example one is 14 thou less than 0.25 – and 14 thou is the interference fit at that size. (Usually I would make the hole standard and put the fit on the shaft, but I guess it works the other way as well..)

John

[DustyParticipant @dusty]

John

I fear that 14thou interference fit on .250 would require the services of a 100 ton press .0014 would be nearer the mark is that what you meant.

[Enough!Participant @enough]

Posted by John Hilton on 16/03/2017 16:13:30:

14 thou less than 0.25 – and 14 thou is the interference fit at that size.

Really?

[ManofkentParticipant @manofkent]

Hi Dusty.

Yup. Cock up on the zeros. Thanks

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