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hole dimension tolerances on prints
2

hole dimension tolerances on prints

hole dimension tolerances on prints

(OP)
Might not be in the right forum....I am looking for a good way to put a blanket statement in my title block to cover HOLE dimension tolerances. I currently use linear dimension tolerances as follows:
x.x =  +/- 0.1
x.xx =  +/- 0.015
x.xxx =  +/- 0.005

RE: hole dimension tolerances on prints

bearisle,

   Are you talking about the diameters of the holes, or positional tolerances?

   How about...

UNLESS OTHERWISE SPECIFIED, ALL HOLES ARE...
DIAMETER:  +.005/-0
POSITION:  <DIA>.006 A B C

   I am assuming that you are drilling the holes, and that you are using them for small screws, such as less then #10.  Your datums are going to have to be A, B and C.

   The advantage of standard tolerance notes is speed and convenience.  The disadvantage of them is that they save me having to think about stuff that I really ought to have thought about.  If I were doing a titleblock in my own drafting office, I would be tempted to _not_ do a tolerance note.

   If someone wants to be lazy, they can add their own tolerance note as a note.  At least they thought about it.  I am getting tired of seeing weldment and sheet metal drawings set to three/two decimal places on English/metric drawings, indicated +/-.005/0.1 tolerances respectively.

                         JHG

RE: hole dimension tolerances on prints

2
The are some specs governing drilled hole
size tolerances.  The H28 handbook gives
the tap drill sizes and the expected
high sizes for the different thread sizes
and assumes 3 times the diameter for depths.  
I have seen a Navy spec for holes in steel.  
You can get minus tolerances with aluminum.

RE: hole dimension tolerances on prints

Dia. Hole               Tolerance
.0135 THRU .125   +.003/ -.001
.1260 THRU .25     +.005/ -.001
.2510 THRU .500    +.006/-.001                 
.5010 THRU .750     +.008/ -.001
.7510 THRU 1.000  +.010/ -.001
1 .001  THRU 2.000  +.012/ -.001
See the following and check out the
web searching on drilled hole tolerances.
This looks like a good approach.  
http://websearch.cs.com/cs/boomframe.jsp?query=drilled+hole+tolerances&page=1&offset=0&result_url=redir%3Fsrc%3Dwebsearch%26requestId%3D4a7f652e33eae6a0%26clickedItemRank%3D7%26userQuery%3Ddrilled%2Bhole%2Btolerances%26clickedItemURN%3Dhttp%253A%252F%252Fwww.engineersedge.com%252Fdrill_sizes.htm%26invocationType%3D-%26fromPage%3DCSResults%26amp%3BampTest%3D1&remove_url=http%3A%2F%2Fwww.engineersedge.com%2Fdrill_sizes.htm

RE: hole dimension tolerances on prints

(OP)
Thank you diamond! That is basically what I was looking for.

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