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Question about cutting a french border…

854 Views 17 Replies 11 Participants Last post by  Metal Smith
A) how deep (technically, wide) to make the cut?

B) Use a tool with a sharp tip, or small radiused tip (.005, .010, 1/64” etc)?

C) Make the cutter parallel to the base (perpendicular to the slide flat), or make the top & flat & cut symmetric by putting the cutter at an angle to bisect the intersection of the slide flat at top-tangent?
Handwriting Font Parallel Slope Diagram

D) If parallel, cut it centered right ON the flat/round intersection line, or offset the cutter tip slightly below so the width of the cut comes up to the slide top intersection line?
Rectangle Parallel Font Slope Diagram

E) why the hell are single-point threadmill cutters so expensive. And I don’t have an arbor saw for slitting either. Can I use a HSS double-angle cutter like this?
Double Angle Chamfer Cutter 1/2 dia X 60 degree MariTool
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I don't think there's any specific rules when it comes to a French boarder. It's my understanding that they were done originally to terminate the stippling or matte on the top of the slide. HSS DA cutter should work fine. I vote for offset.
A-D) My vote is to be unique and pick what you (or your customer) like best. Who cares how other people do it?

E) Single point threadmills and 60º double angle cutters are identical, except for maybe some additional clearance for the Z direction helix angle on threadmills. You could use radiused or sharp point double angle cutters of any included angle you want, or a full radius keyseat cutter. You could use an ultra fast feedrate to give the cut a faceted effect. You could make the cut with large radii in the tool path to give the cut a wavy look. The sky is the limit.

F) French boarders are ugly. :p
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