minimum wall thickness for tapped hole
minimum wall thickness for tapped hole
(OP)
Trying to figure out how to calculate the minimum wall thickness of a tapped hole. I’ve seen stuff for sheet metal, but not for a solid block. Right now, the wall thickness is approx 0.25 x set screw diam. The set screw would be torqued to max holding power. If you have any helpful info, that’d be greatly appreciated!





RE: minimum wall thickness for tapped hole
Upper limit is around 3.0 x nominal diameter, at which depth a Delrin nut can break a steel screw.
I.e., 0.25 x D is generally not enough.
Mike Halloran
Pembroke Pines, FL, USA
RE: minimum wall thickness for tapped hole
RE: minimum wall thickness for tapped hole
Have you looked at smaller size pipe plugs? How about a straignt thread with o-ring on end built to your exact requirments.
Parker Plugs?
CJ
- CJ
RE: minimum wall thickness for tapped hole
RE: minimum wall thickness for tapped hole
Either your thread shears or the outer tubeshears. You have thin wall on one side but enormous wall on the other. I don't think the tube will fail. Try FEA or run calcs with the average wall 360 degrees around. It has to be supported by the thicker tube.
If I was unsure I would run a quick cheapt test. Test it in a press. For the materials, use HT Alloy Steel and same set screw material. Apply axial load in press. Repeat as required.
Pre-torquing may help relieve thread shear as its loaded but I dodn't think you need to do anything except make-it up to shoulder, tighten per spec and apply blue loc-tite so it doesn't come loose.
Just some suggestions...
Let me know what you find do and find out.
CJ
- CJ
RE: minimum wall thickness for tapped hole
Mike Halloran
Pembroke Pines, FL, USA
RE: minimum wall thickness for tapped hole
For holes you need to drill #20(.161) or #19(.166) #10 -32 ta x X dp (or tap thru)
You could also epoxy or weld ends into the frame that may be much stonfer and firmer to fit one of the transverse axles against. I'm not really familiar with the axles but I like to ask questions to see if I can helop and learn soehting. Lord knows I need to.
Chris
- CJ
RE: minimum wall thickness for tapped hole
such as tooling balls or pins which need to be held in place but are not under load.
Mfgengear
RE: minimum wall thickness for tapped hole
RE: minimum wall thickness for tapped hole
Mike Halloran
Pembroke Pines, FL, USA
RE: minimum wall thickness for tapped hole
If you are worried about the set screw backing out (not the intent of the original post) then see if it's possible to add another set screw, and try it as a jam nut. Otherwise, use your retaining ring to hold it in.
Charlie
www.facsco.com