More tool madness

[rsgaz]

A/F on a pentagon? Can you elaborate, rs?

Re-read the text I quoted of EddieM's, in particular, the word I changed to bold originally. Note that I've not edited that post at all.

 

[Burnerman]

Bang on rs! I can't read very well. ....these degrees of mine have proved to be completely useless
John

 

[rsgaz]

on a pentagonal socket, where would 10mm be, point to point, point to flat or flat to flat ?

John did explain the 'height' of a pentagon in post #10 and post #12, maybe you're more visual Eddie.

Dimension 'h' in this diagram, is what John meant by his boy scout tent analogy...

Gaz

 

[Burnerman]

That's how it's measured .....I think
Cheers RS!
John

 

[EddieM]

Ok I'll Endeavour to get a set machined. Might as well get a hole drilled in the middle of them as well.. irritating. .

 

[Burnerman]

What are you up to, Eddie?
John

 

[EddieM]

What are you up to, Eddie?
John

Intriguing huh.... the truth is absolutely nothing. I don't have a specific use or need for them yet.. it is merely a tooling exercise. As such things do not appear to be made (apart from the one size from laser tools) I thought I'd make myself a set. A mans gotta have a hobby however weird it is

 

[Burnerman]

No problem with that - its just the hardening and heat treatment which may give you grief.
Machinists use a 'dividing head' attachment on a milling machine to get the accurate angles.
John

 

[EddieM]

No problem with that - its just the hardening and heat treatment which may give you grief.
Machinists use a 'dividing head' attachment on a milling machine to get the accurate angles.
John

I'll see if I can get an apprentice at work to fettle them. set the cutter at 72 degrees, adjust the fence to suit. Rotate repeat, jobs a good un. I guess a heat and a dunk in oil wouldn't go amiss.

 

[Burnerman]

Only if its carbon steel, mate - it wouldn't make any difference to mild steel. It would stop it rusting though!
John

 

[EddieM]

But steel is a carbon iron alloy is it not?

 

[Burnerman]

Sure, but it all depends on the carbon content of the steel whether it will harden to any degree. Mild steel doesn't harden to any extent and doesn't readily work harden.
What you would do is to use a high carbon steel and heat treat it by the oxidising colours....an example for a cold chisel - if I recall - is to heat the chisel up in the middle, and when the blue colour travels down to the chisel blade, quench immediately in water - sort of freezing the hardness where it's needed.
I'm a bit rusty (!) concerning this now but Google will come to your rescue.
John

 

[EddieM]

Sure, but it all depends on the carbon content of the steel whether it will harden to any degree. Mild steel doesn't harden to any extent and doesn't readily work harden.
What you would do is to use a high carbon steel and heat treat it by the oxidising colours....an example for a cold chisel - if I recall - is to heat the chisel up in the middle, and when the blue colour travels down to the chisel blade, quench immediately in water - sort of freezing the hardness where it's needed.
I'm a bit rusty (!) concerning this now but Google will come to your rescue.
John

Guess it will be made of whatever is in the workshop. Automotive industry.. not sure what kind of steel they use. I work in the diagnostics area.

 

[mwatsonxx]

I used to do secure works in banks. They specified that all fixings had to posidrive type and you then drilled out the posidrive head.

 

[SammyInnit]

I used to do secure works in banks. They specified that all fixings had to posidrive type and you then drilled out the posidrive head.

I recently did some work on a jail/custody suite and everything was stainless torx with a security dimple.