Metric Drawing?
Metric Drawing?
(OP)
Looking for some help with reading this print? I have not had to much experience with metric prints, and mostly wondering about the toleranceing? Obviously you can convert the dimm. to inches but what about that tolerances? For instance it has .003 R/O on the cone, is that .003MM or what is that? same with on the Dia 16, -.001/-.005 is that +.001/-.005MM and if you convert that to inches that is really tight? Also in the title block it is in a different language but what is the mean there with +/-.1, +/-.2 etc?
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RE: Metric Drawing?
RE: Metric Drawing?
RE: Metric Drawing?
0-4 = +/- 0.1
4-16 = +/- 0.2
etc
So, dim 13.8 would be +/-0.2, 90 would be +/-0.5, etc
Chris, CSWA
SolidWorks 14
SolidWorks Legion
RE: Metric Drawing?
0.1, 0.2, 0.3 are for dimensions without tolerances, sorted by the size of the feature:
less than 4 mm - 0.1
4 to 16 mm - 0.2
16 to 63 mm - 0.3
So the length of 900 mm on the drawing will have tolerance of +/-0.5
Also 3 triangles mean surface texture of 1.6 micrometers (somebody correct mi if I am wrong)
Good luck!
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Metric Drawing?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Metric Drawing?
RE: Metric Drawing?
RE: Metric Drawing?
As you probably noticed, the drawing goes back to 1981. Back then (now outdated) version of ISO 1101 allowed application of datum symbol to the common axis of suitable features providing that there aren't too many reasonable interpretations. The inspector with common sense then could chose sharp point and center drill as basis for establishing the axis.
As you can see from enclosed picture, 10 years ago it was already considered "former practice"
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Metric Drawing?
RE: Metric Drawing?
If you can still buy one of these for $32.70 go for it, you won't be able to make one for that price!
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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.
RE: Metric Drawing?
RE: Metric Drawing?
I would agree that TWO 16 dia ground surfaces will make better datum.
And, smwdrum, by today standards you have to explicitly specify what are you going to use as datum feature(s)
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Metric Drawing?
RE: Metric Drawing?
Parts are not made "in metric" or "in inches" - the metal and machines have no idea what units are used to measure it. The part exists in its own state and is only measured using a certain system. Parts are made by gear, belt, screw, cutter movements. There's also nothing stopping a shop from taking your metric numbers, converting them to inches, and using those measurements to create the part.
If I'm measuring a part with a digital caliper, a metric-part is only a button-push away from being an inch-part.
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5
RE: Metric Drawing?
Chris, CSWA
SolidWorks 14
SolidWorks Legion
RE: Metric Drawing?
Button push?
I just look on the opposite side of my vernier calipers.
--
JHG
RE: Metric Drawing?
RE: Metric Drawing?
Normally this dimensioning is done with fit classes. It is common with sliding fits.
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Ben Loosli
RE: Metric Drawing?