topic Re: G1/4 Minor Diameter in Fusion Design, Validate & Document Forum

G1/4 Minor Diameter

Anonymous — Wed, 14 Dec 2022 12:35:28 GMT

Hi,

I've created a threaded hole with a BSP 1/4, but the drawn diameter is bigger (11.668mm) than the Minor Diameter (11.455mm) should be.

Is there a reason for this?

Re: G1/4 Minor Diameter

rushabhthakkar_910 — Wed, 14 Dec 2022 12:50:04 GMT

@Anonymous,

https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/Identical-holes-are-not-the-same-size-when-using-drilling-operations-in-Fusion-360-Manufacture.html

Re: G1/4 Minor Diameter

MRWakefield — Wed, 14 Dec 2022 13:06:49 GMT

The minimum Minor Diameter of a G1/4 (or 1/4 BSP if you're old-school like me) is Ø11.445mm, however there's a tolerance of +0.445/-0 on that. This gives a mean Minor Dia. of Ø11.668mm.

Hope this explains why there's this discrepancy.

Re: G1/4 Minor Diameter

Anonymous — Wed, 14 Dec 2022 14:16:49 GMT

Thank you! I copied a threading operation from another file with a hole size of 11.445 so I'm glad I noticed it!