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I want to make a Longworth Chuck like the pic attached. Getting the arcs right in Designer is a snap. Assigning the 3/16" cutting bit with a cut-thru gives me just the diameter of the bit. How do I make those cut-thrus larger than the diameter of my 3/16" cutting bit so they will accomodate a 1/4" bolt?
go to lowes and get a 1/4" straight edging bit, assign a 3/16" to the project and install a 1/4; when ask to do. stair step the cut a 1/4" at a time for whatever thickness board.
Draw the closed arcs to size and apply a cutpath with a 1/8" bit and a .063" inset. You can adjust the size of the inset for a little wiggle room.
Steve.....can I do that with 1.187 Can't open your mpc.
Never mind.....figured it out - thanks.
Even simpler, draw your arc. Copy and paste it onto itself. Select both arcs. Connect the ends. (Looks like one arc but it is now a closed double arc.) Apply the 3/16" cutting bit and give it a -1/32 inset.
Here it is in 1.187