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Posted by Tim Leech on January 10, 2008, 3:01 pm
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wrote:
>Tim Leech wrote:
>
>
>> I've annealed quite a few head gaskets etc over the years. My concern
>> when you suggested using the hardest copper available was that it
>> might be an alloy which wouldn't soften as fully as the 'real thing'.
>
> Nope! Copper. Not alloyed copper. The hardest you can get is going to
>be a wrought product of some sort, either a drawn tube, or a rolled
>sheet, to harden it.
>>
>>
>>> For forming it in a die (the die will form the profile, yes, rather
>>>than just cuttin out the rings?) anneal the copper to a dead soft state.
>>>
>>
>>
>> The current plan is to turn up a plain disk, form the profile with the
>> die, then skim off the OD.
>
> The OD is the dimension that has the tight specs on it. Makes sense. I
>would consider trying to work out the dimensions required for the blank,
>to press it to a finished article in one shot.
>
> Know anyone in metals? I shouldn't wonder that there was an aluminum
>alloy suitable for the duty these will do.
>
> Cheers
> Trevor Jones
I've got back to this in the last couple of days & have worked out a
technique which should give consistent results (I'll try to post some
details when the job is done), but I'm having trouble getting
consistent parting-off cuts.
I'm using a thin HSS blade, and found that 'pecking' works better than
a steady feed. Trouble is, sometimes - often enough to be a real pain
- all hell seems to break loose when halfway through, and suddenly
the parting cut becomes a wide vee with burred edges. I can only
imagine that it is a bunching of swarf which causes this, although
usually it comes off in a nice curl, but it happens so quickly that
it's hard to tell. Any suggestions from those who have survived the
copper turning initiation rites?
Cheers
Tim
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