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Knurl pitch standard?
Russel:
I have looked and looked and can't seem to find any guidelines as to what pitch knurls to use for any given diameter. Specifically, I am wondering what straight knurl pitch (or set of pitches if you recommend more than one) would be best for thumbscrews of a half inch and smaller.
Any recommendations?
bogstandard:
Russel,
In the UK, knurls are usually classed as fine, medium and coarse.
Normally, you will use a single wheel for straight knurling and double wheels for diamond pattern. But if you have a smallish lathe, that can't take the side loads, or small parts to be knurled, I would recommend a scissor type tool for both, and use double wheels for straight. The pic at the bottom shows what I mean. Middle wheels are fine and two outers are medium.
The rule of thumb for knurling is that you use a straight knurl for tightening and slackening (adjusting knob), and a diamond knurl for grip (centre punch)
I have found that a medium one is good for most things.
Bogs
Bernd:
Russel,
PM sent. Let me know if that's what your looking for.
Bernd
Russel:
Thank you both for the information!
I have the knurler made by Sherline for the Sherline lathe. It comes with a single pair of medium knurls (30 degree spiral knurls with a 90 degree tooth angle at 25 TPI) for making diamond knurls, but I wanted to order straight fine knurls for making thumbscrews.
The difficulty that I'm having is choosing the best pitch and tooth angle. Sherline offers straight tooth knurls in 16, 20, 25, 30, 32, 35, 40, 41, and 47 TPI with a 90 degree tooth angle, and 35, 50, 53, 60, and 80 TPI with a 70 degree tooth angle. I'm guessing that for smaller parts a fine straight knurl would be around 40 TPI. I was wondering if there is any kind of guideline for determining the best pitch for a given diameter. I can count the teeth from a 10-32 socket head to get extra fine.
I'm thinking that I might want something more course for 3/8" to 1/2" diameter.
bogstandard:
Ahah!!
I now see your problem. You want to do it technically rather than by the seat of your pants. What you are looking for is perfection in what you want to do.
As I said, we tend to go for the easy to understand stuff.
http://www.arceurotrade.co.uk/Catalogue/Cutting-Tools/Knurling-Tools
http://www.chronos.ltd.uk/cgi-local/sh000001.pl?REFPAGE=http%3a%2f%2fwww%2echronos%2eltd%2euk%2fcgi%2dlocal%2fss000001%2epl%3fRANDOM%3dNETQUOTEVAR%253ARANDOM%26PAGE%3dSEARCH%26SS%3dknurl%26TB%3dA%26GB%3dA%26ACTION%3dSearch&WD=knurl&PN=Chronos_Catalogue_Knurling_Tools_81%2ehtml%23aKN_2e_2e_2e#aKN_2e_2e_2e
There is nothing wrong with what you are attempting to do, in fact you will have learned a lot more about knurling than all of us put together by the time you have finally sorted it.
Unfortunately, what I have said is about the limit of my knowledge (which isn't much) about knurling.
Keep up the good work, and I will look forwards with great interest to your final conclusions. I will be able to add to my database.
Bogs
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