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cnsranch
03-25-2017, 07:16 AM
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?

myshop1044
03-25-2017, 07:30 AM
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.

SteveNelson46
03-25-2017, 10:21 AM
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.

cnsranch
03-25-2017, 10:25 AM
Steve.....can I do that with 1.187 Can't open your mpc.

cnsranch
03-25-2017, 10:29 AM
Never mind.....figured it out - thanks.

bergerud
03-25-2017, 10:31 AM
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.

SteveNelson46
03-25-2017, 10:43 AM
Here it is in 1.187