AnsweredAssumed Answered

inch vs mm prints and available tooling

Question asked by Derek Eldridge on Feb 5, 2016
Latest reply on Feb 11, 2016 by Anna Wood

I'm being pushed to produce mm sizing on prints rather than inches.

I was looking at available tooling and it would appear that ANSI Metric drills are provided every .05mm. (~0.0019in) in the range from 1mm to 2mm.

ANSI Inch drills on the other hand, are not spaced evenly in the same corresponding range of (.040in to .0785in)

 

But, when you look at reamer sizes available from Mcmaster;

Metric reamers, available in the above range, include only 1, 1.5, 1.6, 1.7 and 2mm.

Inch reamers available in the above range include every .0005" throughout the range. A lot more control on accuracy.

 

With that said, It would appear to me that if you wanted tight locational or reciprocating fits, inch tooling is the only way to get it. (within the sample size range)

 

I'm told that outside the United States, all machine shops are using metric tooling only, and do not have access to inch tooling.

First, is it true that outside the United States, inch tools are not available or used?

Second, are more metric tool sizes available outside the United States?

Is there a different metric standard than ISO or ANSI that includes more drill sizes that may be used outside the United States?

 

Also,

Why are reamers not an option in the solidworks hole wizard?

Outcomes