Relief Cut

[blckwtr]

Hello, everyone...

Where can I find litterature on relief cut? Does anyone know?

 

[CorBlimeyLimey]

In relation to what? Shafting, threads, moulds or moulded products, engraving, sheet metal, flood control, origami, ???

 

[blckwtr]

Cheers, CorBlimeyLimey...

In this case we are talking notch relief groove related to tensile or compression in steel components, axisymmetric components, where the force acts in an axial direction.

 

[wes616]

Regarding cracking relief?

You may want to look at Peterson's Stress Consentration Factors.

Wes C.
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[blckwtr]

I don't have that book, but does it tell you how to get rid of the stress concentrations? I know where the problem lies, but not how to optimize my design...

--Tommy--

 

[Cockroach]

I use 1/32 inch on diameter, box X pin. I then round to the nearest 1/64 inch fractional diameter. Typically these are 1/4 inch wide, maybe 3/8 inch on the back of the box.

For example, 1.000 - 8 Stub Acme-2G would exhibit a thread relief of 0.859 dia X 1/4 inch long on the Pin, and 1.062 inch X 1/4 inch long on the front of the Box (i.e. counter bore) and 1.062 inch X 3/8 inch at the back.

I like to break these reliefs with a 45 degree angle in all cases.

Note that you would apply the 1/32 inch over diameter relief to tyhe miniminm minor diameter on the Pin, maximum major diameter on the Box. I have a threading program which determines this for me, good for Acme, Stub Acme and UN (coarse, fine, extra fine & special). This saves me time in recomputing the proper threading geometry.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada