help with a thread
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Well done @Leggy
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Hi guys
Again thanks for all your help
Is there a chart you use to look up thread dimensions, pitch, tpi , crest etc
I was trying a m22 x 2.5 and got a bit confused on the chart I was following, so I asked ChatGPT
After 4 hours of me telling it, it was wrong, it finally agreed
I was drawing it in SU then asking it questions on the iPad
When I get home I’ll upload my figures and see what you think, the thread looks good on the screen, but that doesn’t mean it will fit
Thanks Dean -
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These are what chat told me
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@Leggy said in help with a thread:
Is there a chart you use to look up thread dimensions, pitch, tpi , crest etc
I would use the following site:
External Metric ISO Thread Table Chart Sizes M20 - M55
Metric external thread size table chart for sizes M20 to M55 Bolts and screws per. ANSI/ASME B1.13M-1995.
(www.engineersedge.com)
I wouldn't bother with the radiused corners because they'd be too small.
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Ill check it out
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What about tpi?
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@Leggy said in help with a thread:
What about tpi?
What do you mean? The thread pitch is given along with the other dimensions for the threads. TPI standas for Threads Per Inch and is not used for metric threads. M22x2.5 indicates the nominal diamter is 22mm and the pitch is 2.5mm. The helix rises 2.5mm for each rotation.
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Ah ok , I see what you mean, this is where ChatGPT was messing with me
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How do I get rid of the grey spiral in the last picture?
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Can't you just select it to highlight it and hit Delete to make it go away?
Are you modeling internal or external threads?
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No, it seems to be in hidden sections, so would have to select every faucet on the plane and line
What I found is if I draw an arc from the top of the inner profile to the bottom, and do the helix , I can click on the curve and can delete it all
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cant see the difference vwhy, but it works, the threads are great
what I found is a difference in tolerances, I printed 3 nuts with 0.1/15/2 offsets in petg and tpu, 0.1 was good in petg, but had to go to 0.2 for tpu
what a week of RND -
@Leggy said in help with a thread:
it seems to be in hidden sections, so would have to select every faucet on the plane and line
Likely you need to weld some edges first.
@Leggy said in help with a thread:
what I found is a difference in tolerances, I printed 3 nuts with 0.1/15/2 offsets in petg and tpu, 0.1 was good in petg, but had to go to 0.2 for tpu
Not surprising. They have different shrink rates.
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