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Post by parkin79 on Jul 12, 2018 10:23:08 GMT -5
I am cutting a lot of 3/4 inch plywood and one thing i notice is the chatter i get from my machine. i have checked to make sure the bit was nice and tight and my work piece is locked down with clamps and double sided tape. Attached is a image of the setting i was using during the cut, but the was adjusting the rpms as i was cutting from the recommended 18,000 to 15,000 and did notice a improvement. if there is any info i missing let me know and i will try and fill in the missing pieces. ty Screen Capture
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Post by stevem on Jul 12, 2018 11:01:30 GMT -5
Chatter when cutting 3/4 ply is normal. You have to remember that you are cutting several cross layers of wood with glue between the layers. I also cut ply and run at 19,000 and a feed rate of 60 ipm with a cut depth of 1/8". That usually reduces the chatter some.
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Post by parkin79 on Jul 16, 2018 9:51:19 GMT -5
When I finish cutting on plywood, with a down cutting bit I notice the top has clean cut. Then when I turn it over the cut is not a clean one. Are there settings I am missing that can clean this up. I can easily clean this up with my sander. Thanks.
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Post by stevem on Jul 16, 2018 10:27:08 GMT -5
Are you using tabs when cutting? Another thing I do is use a spoil board and cut thru the entire piece. A down cut will give you smooth cut on the top and a rough cut on the bottom. A up/down cut will give you a cleaner cut on both top and bottom, but you need to make your first pass about 1/8" or more for it to work properly. I also cut no faster than 60-80 ipm when cutting.
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Post by parkin79 on Jul 16, 2018 10:41:57 GMT -5
yes i am using tabs. i am also cutting thru the piece, using a down cut bit. i am within your ipm of 60-80. so i will have to try that other bit and see what results i can get from using the other bit. ty Stevem.
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Post by Gary Campbell on Jul 16, 2018 12:32:21 GMT -5
Stevem… When cutting veneer plywood products the following will virtually always be true: Upspirals leave a splintered top edge, Downspirals leave a splintered bottom edge, a compression bit will leave both top and bottom clean and a straight flute will in most cases produce veryclean edges o both at a lower cost than the compressions
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Post by parkin79 on Jul 16, 2018 12:40:31 GMT -5
time to try out some other bits, thanks guys for the suggestions.
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Post by redwood on Jul 16, 2018 13:41:15 GMT -5
I rarely cut plywood, but the same method might apply. I cut out almost everything with a upcut bit, but first I'll go around the pattern with a V-groove bit. Very little depth is required to get pretty clean edges.
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Post by dickdelmi on Jul 17, 2018 10:46:13 GMT -5
I would also try reducing the stepover to about 20% and upping the feedrate to 100 ipm. A larger bit might also help.
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pdabk
New Member
Posts: 16
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Post by pdabk on Jul 23, 2018 18:59:10 GMT -5
I would suggest a compression bit...that'll give you a down cut at the top and up cut at the bottom
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Post by Axiom Tool Group on Jul 24, 2018 14:06:22 GMT -5
Are you setting the RPM only in the tool-path setup? Or are you adjusting the VFD at the control box as well.
We have heard from a number of customers for which this is not been clear.
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Post by parkin79 on Jul 25, 2018 21:20:13 GMT -5
I have been doing both, depending on how it cuts.
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Deleted
Deleted Member
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Post by Deleted on Jul 28, 2018 10:09:06 GMT -5
Besides using a compression bit, you could use a down cut bit to do the top side outline at the same time you're using it for other top side features, then switch to an up cut bit to finish everything.
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