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George,When I was buying some metal over the weekend the guy there mentioned freezing ptfe before machining it and it behaves more like metal. Have you ever heard of this or tried it? By the looks of your thread you don't need to as long as you take light cuts etc.Nick
I hope this isn't too , but I'd like to ask an advice.I have made several spark plugs for my test engine, using ptfe as an insulator. Problem is, that the insulator wears out really fast, and finally causes sparking to appear in a wrong place. Also the insulator, while it erodes away, gathers black dirt, that makes sort of bridge, that leads the plug to shortcut.Ignition system, that is in use:An old computer psu 12V 2.5A as a power supply.Automotive 12V ignition coil. Could that 2.5A be too little?Fuel that I use is gasoline without an oil addition.