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Clock wheel cutter

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andyf:
Cherries vary in shade. In one of his books, L C Mason said it was better to go beyond most cherries to the colour of boiled carrots, where orange is beginning to creep in. That seems to work for me.

Andy

NickG:
Chris,

I think you have all the answers now, everybody has mentioned what I was going to say and I think you've started addressing the issues. Just to summarise incase people miss anything:

Firstly, you know the profile of your cutter should be right as you profiled it cylindrically and sectioned it. As you said, it didn't look like silver steel so it's too soft. Only the 2 Johns picked up on the fact that it has infact no clearance angle, because it's made from round, the work piece is actually tangential to it when it's cutting and as John S said, that's why you can see brass pick up on it. This and a combination of soft brass and not being sharp enough has to be why it's not cutting properly and bending the material.

The only way the angles can be out is if your tramming is out (unlikely) or you didn't get back to centre height.

As Bogs said, the guy that feeds on the Y axis must also feed a little each way on X too, otherwise he'd have a radiused bottom to his teeth (however small that may be as it's very thin). So you might as well set the depth of cut and just feed on X.

Excellent thread, well done, good first attempt - keep up the good work. You've gone onto another level now and are certainly carrying out more complex machining than I am.

Nick

Bernd:
One more thing about hardening the cutter. I've read magazines that call for hardening a piece that a magnet is used to tell when the part is ready for quenching. The part you are heating will no longer hold the magnet. This does not mean to leave the magnet on the part as you heat it but getting close with the magnet untill it doesn't attract the part anymore. Then drop it in your quenching medium.

The part should actually be swished around in the quenching medium due to pockets of vapor forming near the heated part, thus insulating it from the quench meduim. This causes certain sections to be harder than others.

Good luck on making your new cutters. Hope you have success this time around and above all take your time.

Bernd

Bluechip:
Bernd

Called the 'Curie Point'.

http://www.britannica.com/facts/5/622880/Curie-point-as-discussed-in-steel-metallurgy

Lots of other sites to search the subject if you like long words ..

Dave BC

bogstandard:
Dave,

I remember it as the CURRY point.

RED HOT a**e, when you lose your grip on things.


Bogs

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