
06-19-2006, 11:35 AM
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| | | Join Date: Jun 2006 Location: Canada
Posts: 34
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Its called a scratch test. Take a file and scratch your material.. If it scratches easily and its steel.. 80 sfm with a high speed tool is a good start. 400sfm if its a carbide tool. Here..(sfm) x (4) divided by effective cutting diameter will give you RPM. If things get hot slow down the surface speed.Carbon when heated and pressured to the extreme turns into diamond.If its a non ferrous alloy youre dealing with you can cut much faster. Make sure your cutting edge has good lubrication (coolant is good). Material when plasticized due to friction of constant surface speed can become sticky and weld to your tool. Remember.. The deeper the tool the hotter she gets. Depth of cut, chip thickness and horsepower availability all take into play here.. Experience will make you a good speed and feed man. Did ya know that parts get harder the longer they stand on the shelf?. Chop..chop..
__________________ General Machinist / CNC contract Instructor |