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Posted by: johnmtalley

01/31/2004, 02:44:59

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Im working on an elaborate personal project that requires drawings. I have built a prototype and have been working on prints...I have just realized that in my near 15 years experience in metalworking that I have never seen a gnurling callout on a blueprint...can someone gie me some info on how gnurling is dimensioned and called out...

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Re: knurling
Re: gnurling -- johnmtalley Post Reply Top of thread Forum
Posted by: RandyKimball
01/31/2004, 18:41:11

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Knurling [what you see on a ratchet wrench handle] is called out as fine, medium or coarse, ... or .... 64, 96, 128, or 160 diametral pitch (64 being the most coarse). A 64 diametral pitch knurl would cut about .006" into the work and raise the work about .0025" (.012" into & .005" raise on the diameter).

You draw a line around the dia. where the knurl starts and where it stops and use a note arrow to identify what knurl to use between the lines. I consider most ratchet handles to be a coarse knurl.

Use a fine knurl to raise diameters to improve press fits.

Your diameter changes will tend to be close to this chart:
64 - .012" into & .005" raise
96 - .010" into & .004" raise
128 - .008" into & .003" raise
160 - .006" into & .002" raise

For handles and such a shop will set the machine to get a knurl that looks and feels best within the pitch you specify. The size of a knurl result is rarely called out at less than .01" per diameter unless it must fit past, into, or over another diameter.

I hope this is enough to get you going.

The worst suggestion of you lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

Modified by RandyKimball at Sat, Jan 31, 2004, 19:15:48

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