Dimensions with M/M

[NBiz]

I am trying to uncover what "M/M" means on dimensions from bearing drawing. It was produced in 1971 but later revisions in 1999 and in 2010 and not sure if revisions added the "M/M". No reference to drawing specification but is an old British drawing so assume BS 308.

Dimensions as follows:

Width:

​

.3937 +0 -.002 10M/M
OD:

​

1.25980 +0 -.00035 DIA. 32M/M
ID:

​

.4724 +0 -.0003 DIA. 12M/M
Corners:

​

.024 RAD. .006M/M

I would be most grateful if anyone can help identify what M/M indicates?

Thank you

 

[pmarc]

Except for the last row, all the numbers directly preceding "M/M" are millimeter equivalents of the nominal inch values.

So perhaps "M/M" is just an acronym for millimeter.

 

[NBiz]

Yes, can't believe I didn't think of that.

The last row is possibly an error on the drawing and should in fact be .6 M/M. I can't think of anything else it could be.

Thank you

 

[dgallup]

Yeah, I saw that as soon as I saw the first number. Incredibly bad practice, with dual dimensioning one set of dimensions should be marked as reference and nobody ever abbreviates millimeters as M/M

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[Hallec]

I find the easiest thing to do is include in a general note "ALL DIMS ARE INCH[MM]" and be done with it.

I'm not a vegetarian because I dislike meat... I'm a vegetarian because I HATE PLANTS!!