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Nut insert for repair

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Chuck in E. TN:
 John(Doubleboost),
Very neat repair you demonstrated in Sunday Nite Nightcap # 66 (0iPSQ&index=1). Is there a formula or rule of thumb that lead you to choose 7mm to bore for a M4 nut? Any correlation that can be used for such repairs using SAE nuts?
All the best to you and Debs.
Chuck

studders:
I've used that method a few times in wood, never occurred to me to use it in aluminumium. One to remember.

studders:

--- Quote from: mklotz on April 13, 2015, 11:15:54 AM ---To do this we need to calculate the diameter of a nut ACROSS THE POINTS .........

d = 2*r
w = 2*a

From the diagram, we have,

a = r * cos(x)

so:

2*a = w = 2*r*cos(x) = d * cos(x)

Solving for d,

d = w/cos(x)

For a hexagonal nut, x will be 30 degrees so,

cos(x) = sqrt(3)/2 = 0.866

Finally,

d = w/0.866 = 1.1547 * w

--- End quote ---

Doubtless that was the very method John used to arrive at 7mm.

I favour the 'guess it and whack it' approach.

awemawson:
I claim prior invention on this as per my posting in my Fanuc Wire EDM rebuild thread in October 2014  :lol:


(Actually the idea was suggested to me by a poster on the MIG welding forum)

mklotz:

--- Quote from: studders on April 13, 2015, 11:26:21 AM ---I favour the 'guess it and whack it' approach.

--- End quote ---

I'm sure you do.

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