The joys of turning copper

We use copper for the pins on our big rail connectors, but I think we use a hard grade as it not only turns better but is less likely to cause a problem on the actual connection.

Pure copper is great for busbars etc but a real PITA to drill and machine.

Peter

-- Peter A Forbes Prepair Ltd, Luton, UK snipped-for-privacy@easynet.co.uk

I tend to use lubricant on both turning and drilling. Drilling is multi pecked. Copper sticks to the tool cutting edge and as soon as it does you get the problems. Lubricant does not prevent it entirely but it certainly delays the build up and helps keep the generated heat down. My lubricant is a general cutting oil. The same technique is used when dealing with soft PB that has similar problems but not as sever.

I have heard condensed milk is supposed to be a good lubricant for pure copper. Ditto milk or cream. I've never needed to try this. It might be a good idea to keep the cat out of the workshop or it'll go down with copper poisoning.

Guy