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Diamond Knurling Specification

Diamond Knurling Specification

Diamond Knurling Specification

(OP)
I am designing a press fit bushing to fit into a nylon part.  The bushing is actually a compression limiter so that a bolt can be torqued down over the part (and not compress the nylon).  I have specified a medium diamond knurl pattern, based on seeing similar press-in inserts, but I don't really know what is the appropriate knurling detail (size, TPI, spec?) to use.  We are going to make a prototype and try it, but I want to start with something reasonable.  What should I specify so my machinist can make a good part?

Thanks,
Jeff

RE: Diamond Knurling Specification

You need to specify by teeth per inch or circular pitch. ANSI B94.6-1984 established perferred sizes. I'm para-phrasing the information from the Tool and Manufacturing Engineers Handbook. The Machinery Handbook also has a section on knurling. It gives formulas for knurling.

RE: Diamond Knurling Specification

(OP)
I don't have access to the ANSI standard.  Is there an online reference that tells me how many TPI for a "medium diamond knurl"?  Anyway I can verify, before I make the part, if that number of TPI will give me a good press fit into a nylon part?

Thanks,
Jeff

RE: Diamond Knurling Specification

Get a Machinery handbook and review the information. The actual size of the part and the expansion will have to be found by experimentation.

RE: Diamond Knurling Specification

I think you would be better off if you bought the compression limiter.  They are very reasonable the last time I checked.  There are formula's that allow you to verify if you have achieved the proper clamp load on the bolt.  The compression limiter doesn’t have to press fitted, though I think it is better especially if the component is removed often
.
We use a lot of the item you describe made by the following.

http://www.spirol.com/apps/internet/spirol/website.nsf/SpirolSplash!OpenForm

RE: Diamond Knurling Specification

(OP)
Unfortunately, I haven't found a supplier (including Spirol) that offers an off the shelf compression limiter that will fit.  They have quoted a custom part for us, but we think we can make it cheaper.

RE: Diamond Knurling Specification

Jmarkus,
   Contact http://www.accu-trak.com/ and they will help you through this. They're the best in the business!

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