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Subject: Re: Edge Quality on Plywood

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Message Thread:

Edge Quality on Plywood

1/19/16       
BigTup

We are just getting started running jobs with our Pratix. Here is a photo of the edge quality in pre-finished maple. You may not be able to see in the photo, but the the edge is not straight, there is a slight step. Terrible! Test pieces run in melamine were near perfect. Speed, feed rate, tooling? Any input as to what we need to change would be appreciated.


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1/19/16       #2: Edge Quality on Plywood ...
Gavin S

Website: http://soraghanwoodworking.net

What are you using for tooling ?

A 3/8" compression but should deliver great results , much cleaner than your picture . Feeding @ 450 IPM (a lot of production guys run faster ) @18,000 rpm
Even a 3 flute down cut should yeild better results

Out of curiosity did you buy your router new and who did you purchase from ? Patrix were on the table when I was in the market .

1/19/16       #3: Edge Quality on Plywood ...
cabinetmaker

we started running at a much higher spped to reduce tooling wear. It was such an increase that parts were moving and I have a 40hp pump Then we started return onion skinning everything. Edge is much better and the parts are coming off done and clean

I will post our speeds tomorrow.

We use Vortex 3130xp for melamine, plywood and double layed laminate

1/19/16       #4: Edge Quality on Plywood ...
daveguru

Make sure you "Power Cut" plywood as opposed to "Climb Cut".
Climb cutting will give you the furry edge finish in the pic.......

1/20/16       #5: Edge Quality on Plywood ...
jerry Member

It does look like he is climb cutting. I would do some tests cuts but cut the pieces so you have a drop and look at both sides of the cut and see what side is better. then change direction and cut again

1/20/16       #6: Edge Quality on Plywood ...
Dropout Member

If the edge needs to be decent I use chipbreaker compression spirals and if not I use roughing bits.

2 flute compression spiral chipbreaker - 600IPM climb cut full depth less 0.030, finish pass 600 IPM full depth opposite direction, slower finish pass smaller pieces.

I refuse to cut import ply.

1/20/16       #7: Edge Quality on Plywood ...
John McGinnis Member

Website: http://www.TGCabinets.com

That's pretty bad. We have the same router. We use an Onsrud 3/8" Compression bit with marathon coating for our outlines and a Vortex 3/8" Down for dados. I'll post a pic of the tool settings for both. The software should look familiar. The one with the cutter diameter of .371 is the down and the one with the cutter diameter of .375 is the compression.


View higher quality, full size image (1224 X 1632)


View higher quality, full size image (1224 X 1632)

1/21/16       #8: Edge Quality on Plywood ...
Jason Scott

Am I the only one who noticed the scorched edges at the corner and the beginning of the tenon? Make sure that you are cutting a round toolpath around your corner. I have been cutting baltic birch 1/2" thick at 22-23 Meters/minute (about 900 ipm) with an onsrude 3 flute mortise compression. Nearly perfect edges but we had to change our onion skin to 0.07 thick or it chipped really bad on the bottom edge. We run 3/4 melamine 28-30 M/Min on melamine depending on the parts.

1/23/16       #10: Edge Quality on Plywood ...
John Murphy

Website: http://www.allstaradhesives.com

You can avoid the onion skin and the reduce chatter by simply running (applying a peel-n-stick sealant) inside your tool path.
A product 1/16" thick by 1/4" wide would be perfect for your application.
If any of the CNC operators who have offered tooling and programming suggestions to resolve this issue please contact me for a free roll of this product and DIY.
Good Cutting
Captain Sticky

 

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