Gallery, Projects and General > Project Logs

Clock wheel cutter

<< < (2/17) > >>

Gerhard Olivier:
On hardening I have been advised once to heat to cherry red and quench and then anneal by putting it in the deep fat frier ( chip maker) cold then heat to max for 30min and turn the power off.  This is supposed to heat slowly to 190-200 deg and then cool slowly.????

I have never tried it because I have always heated it so just the cutting end is cherry red so -hardening only the tip.

About slipping -A washer and nut should do just feed slowly as the cutting pressure would be interupted.


Hope some of this helps.

Gerhard

raynerd:
Geroli - with the tip on my cutter being fully supported I wondered also whether to head the cutting edge to cherry red and not aneal it. It will be brittle but very hard and unlikely to shatter because of the cutter shape... ?

Chris

raynerd:
 :( 

Stew, just spent a while in the shop making an arbour for this cutter as you suggested. The hole in the cutter is 5mm so I made the arbour and threaded it M5. As I predicted (because it has happened to me before) when I came to tighten up the bolt against the cutter and put some proper force against it, the bolt just started to spin and ruin my thread!

I`m using an M5 domer die but something is clearly not right with my thread. Any suggestions - as I described in my first post this also happened the other way around when I threaded my bore in the mandrel to hold the cutter blank when I tightened up the bolt it started to spin in the hole.

I`m using force but nothing excessive....

Anyone help?

andyf:
Chris, is there enough room on the face of the mandrel and in the tool to fit an off-centre locating peg? Then, you wouldn't have to clamp up so hard - the peg, not the tightness of the bolt, would stop the tool spinning.

Looking at your tool, it strikes me that if it does turn out to be silver steel, the tip might be a bit brittle if you don't temper after hardening it, particularly with the constant hammering of an interrupted cut.

Andy

75Plus:

--- Quote from: craynerd on October 25, 2009, 02:31:14 AM ---Would you bolt up directly against the cutter or would you slip on a washer to give more surface contact against the cutter. I can just imagine it not locking it tight enough and when it comes to cutting the wheel it spinning the cutter around rather than making the cut.

Chris

--- End quote ---

Cupping the washer slightly will increase the pressure on its periphery when the screw is tightened.

Joe

Navigation

[0] Message Index

[#] Next page

[*] Previous page