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General Mach Discussion / Re: Machining Vinyl Spindle speeds and feed rates???
« on: April 25, 2010, 12:56:52 PM »
Hi Bill,
This problem was discovered by engravers, many years ago.
The trouble is that the very tip (magnified) of a standard vee tool has no cutting edge therefor a great deal of friction is present which, with stuff like HDPE results in melting and subsequent poor finish. If you study the geometry of an engraving point, you will see that it has a flat on the point (only about 0.004" wide) and this flat has clearance which makes it into a cutting edge and therefore reduces friction.
Exactly where one can be purchased I don't know but there must be 'purpose made vee tools' which are made especially for plastics which probably look just like the standard engraving points.
Tweakie.
This problem was discovered by engravers, many years ago.
The trouble is that the very tip (magnified) of a standard vee tool has no cutting edge therefor a great deal of friction is present which, with stuff like HDPE results in melting and subsequent poor finish. If you study the geometry of an engraving point, you will see that it has a flat on the point (only about 0.004" wide) and this flat has clearance which makes it into a cutting edge and therefore reduces friction.
Exactly where one can be purchased I don't know but there must be 'purpose made vee tools' which are made especially for plastics which probably look just like the standard engraving points.
Tweakie.