Tips/Techniques Dimensioning and tolerancing

I went searching for info on what H6 meant in relation to a shaft dimension and found this excellent document on dimensioning and tolerancing.

 

[jcdammeyer]

I went searching for info on what H6 meant in relation to a shaft dimension and found this excellent document on dimensioning and tolerancing.

WELL CRAP! Now that I've seen it I can't un-see it and that means I now have to improve how I dimension my drawings. @DavidR8 ... Don't you have something to build in the shop instead of flooding us with useful information?

 

[djberta]

That is a great document.

 

[Susquatch]

I got drowned in that crap when I was required to do it. Now I only do what I feel is needed. But it's always useful to know what the various terms mean when others use them.

 

[CWret]

This rather dates me - but I took drafting and was required to be proficient with a slide rule.
Oh yeah - also learned descriptive geometry and how to use log tables.

 

[ChazzC]

This rather dates me - but I took drafting and was required to be proficient with a slide rule.
Oh yeah - also learned descriptive geometry and how to use log tables.

Join the club: when I say “descriptive geometry” I get blank stares or at best “What’s that?” If I tell them, “It’s figuring out where a line connecting two points on opposite sides of an oblique plane passes through the plane using drawings” and that really bewilders them.

That was 55+ years ago.

 

[ChazzC]

I got drowned in that crap when I was required to do it. Now I only do what I feel is needed. But it's always useful to know what the various terms mean when others use them.

I just rely the old standby of +/- half the least significant figure of a dimension and “free-running fit.”

As a hobbyist (and not an engine builder) these work for me. Now if I were a former Die Maker, I’d probably have a different opinion.

 

[LenVW]

Descriptive Geometry was a topic I was taught back in college in the 1980s.
I rarely used it for work after CAD was introduced in the 1990s.

I just remember the one rule . . .
“Lines must be perpendicular to the plane to be ‘true’ length.
Can in handy for doing ‘flat layouts’ of diverters and bin plates for bulk material processing system projects with grain and cement companies.