Author Topic: Planis Farm Boy Engine  (Read 1230 times)

Offline Plani

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Re: Planis Farm Boy Engine
« Reply #15 on: June 08, 2020, 09:33:59 PM »
Thank you gentlemen for the kind comments!

Terry, actually I'm doing both. To mill aluminum I'm using a little bit of coolant mixed into the airstream mainly to provide some lubrication. Milling steel with the carbide cutter is done dry. For carbide it's better to use either a lot of coolant (really flood it) or none, because if there's only little coolant the thermal stress on the cutting edge is increased and the cutter won't last as long.
The air helps to keep the swarf away from the surface. This is also vital to mill steel with high feedrates because otherwise the cutter tends to gall up and break. With the aluminum it helps the finish if there ar no chips mangled between the cutter and the finished surface.