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PeterC

trick for cutting soft metals

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Back in the day I had to regularly machine parts out of pure copper and aluminium, radar  parts, bloody nightmare! Could have done with that tip.

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As an aside two engine rebuilds back (so not very long long) I noticed that when stripping the engine where I had numbered the tops of the alloy pistons with a big permanent marker on previous assembly, that engine desposits, oilly tar etc seemed to have a reluctance to stick to the numbers anywhere near as well as it had done to the cleaned alloy. So just for fun on that assembly I coated the tops of all the pistons if red permanent marker. On stripping at the end of the season whilst no obvious trace of red left, the piston tops did seem remarkably clean. Of course I had done other modes to crank case breathing etc. which may have prevented as much oil being sucked down past the valve guides, and I know by then I had the fueling about smack on, so really nothing more than an idle observation. 

But at about 50p's worth of marker ink....

Alan

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