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Old 01-31-2018, 10:42 AM
jbiddle jbiddle is offline
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Default bit/cut method for 7/8' mahogany

I need to cut out some parts for a bed frame I'm working on. The rails and stiles will be made from 7/8" mahogany. The top rail of the headboard will have curves on the top and bottom. I'm look at the best approach to use for cutting that part. I was thinking of using a 3/8" compression bit cutting all the way through except for a cleanup pass. My partner thought a 1/4" downcut for a shallow cut followed by a 1/4" upcut would be better. What do you think?
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Old 01-31-2018, 10:45 AM
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The part I'm referring to is not the top cap piece, its the part below it. I already have the top cap bent lam glued up using a MDF form cut on the CNC.
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Old 01-31-2018, 11:01 AM
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Gary Campbell Gary Campbell is offline
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I would use the 3/8 compression. 2 passes down to .030 with an allowance of .010-.015. Make sure the compression has a CEL > 1"
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Old 01-31-2018, 12:14 PM
jbiddle jbiddle is offline
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Quote:
Originally Posted by Gary Campbell View Post
I would use the 3/8 compression. 2 passes down to .030 with an allowance of .010-.015. Make sure the compression has a CEL > 1"
And then make a final pass to take it to zero?
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Old 01-31-2018, 12:18 PM
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Gary Campbell Gary Campbell is offline
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Yes, when you use an allowance offset, of say .010, the last pass (which you can slow down for edge quality) will make a full pass removing the .010 left (on the edge) by previous passes AND the .030 onionskin left on the bottom
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Old 01-31-2018, 01:34 PM
Jim_in_PA Jim_in_PA is offline
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Thanks for this thread, James, and your expertise, Gary. This was actually something I was thinking about this morning and last night as I anticipate leveraging my machine for furniture parts, too. Very instructive!
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Old 02-01-2018, 02:31 PM
jbiddle jbiddle is offline
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Gary, great recommendations. The cut came out really nice. Top board in the pic was the test board with no last pass and a dull bit. Bottom board was the real cut. Other pic shows two of the more difficult parts for the bed. Oh, and the torsion box for the vacuum press and the roll-around cabinets underneath were made on the CNC as well.
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File Type: jpg IMG_2024.jpg (88.8 KB, 107 views)
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Old 02-01-2018, 03:28 PM
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Gary Campbell Gary Campbell is offline
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Well lookie there! Glad it came out well. Shows that even an old blind squirrel can find a nut every now and then.
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Old 02-01-2018, 06:45 PM
Jim_in_PA Jim_in_PA is offline
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Wow..that really did turn out beautifully!
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Old 02-01-2018, 09:41 PM
drummerjg drummerjg is offline
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What a difference in cut quality. Kudos to Gary for sharing more excellent advice on how to make a quality cut.
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