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Subject: Re: what is best process (RPM & Feed Rate) to cut Sapele wood

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Message Thread:

what is best process (RPM & Feed Rate) to cut Sapele wood

9/21/24       
leonard cordaro Member

I have a project that is high quantity and I need some guidance on cutting times.

The wood is Sapele and the cut is a groove that is 5/8" wide by 3/16" deep.
The workpiece is 108" long and we need to cut 48 grooves the entire length (108") on the piece.

We have a CNC Router 5x12 and the spindle can spin up to 24,000 RPM. The router weighs 7,800 lbs and is very new.

we have never cut this type of wood before so does anyone know what is the best cutter for this type of groove? we assume we need to do 2 passes for the depth.

I have attached the profile of the cut showing a cross section.

Any advice is greatly appreciated.

Thank you all.


View higher quality, full size image (1177 X 761)

9/22/24       #2: what is best process (RPM & Fee ...
Tom Gardiner

I would do this on my shaper not the cnc. The finish would be much better. Something like a six tooth slotting head will give a clean bottom and sides. The down side to using the cnc is you will have circular marks in the bottom of the groove which will be a pain to sand.
For the cnc I would try a down shear 1/2" bit in two passes. Aim for about .005" chipload per flute. Be wary of the hold down of the vacuum. Grooving wil release tension on the board and it may lift off the table.
I have had success with an FS Tools brazed down shear 1/2" x 1 1/2" bit for soft and hardwood solid work. I don't know the part number.

9/22/24       #3: what is best process (RPM & Fee ...
Hen Bob Member

If this is a large run a molder would be the best choice.. As Tom said, sanding all the cutter marks outs is a deal breaker. I would make a jig to hold the parts as well

9/22/24       #4: what is best process (RPM & Fee ...
Dustin Orth  Member

Find someone with a molder, if what I read is correct, you have 48 pcs to mill. Not counting setup time, that's 15 minutes of run time, add 30 minutes for setup or so. Custom knife for this is 3-4 hundred. Add all that together and you'll make money using the right machine for the job. Save the CNC for it's best purpose, this isn't it.

9/23/24       #5: what is best process (RPM & Fee ...
Allen Chalifoux

Bob Hen and Dustin Orth have this right.
That profile plus the tounge and Grove can easily be run in one pass on a molder.
Quick, simple and done. Allen

 

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