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CNC bit Chipping7/12
I have some trouble with 5/16 bit.
If you have been reading posts here before, you should know that you need to provide more information. What kind of bit? Up spiral, down spiral, or straight. How many flutes? Feed and speed data. Did you ramp in the cut, or plunge vertically? Single pass? Just guessing, without any important information, it looks like a plunge cut, single pass where the two cleanest cuts were first and second in order. Rpm's too high, feed too slow so the bit got hot and chipped out the remaining cuts. That is only a guess. Another possibility is poor quality core on the board is contributing to the problem.
Are both cuts going in the same direction. One looks like it is packing the chips in front of the cut and the other looks like the chips are behind
As asked previously...
1. What type of bit? Up Shear, Down Shear, Compression, Straight?
...if using a Compress bit and the depth are NOT the same then -
The shallower cut would be exposing the Up Shear section of the tool to the top melamine surfece, whereas the deeper dado would bury the Up Shear section and the Down Shear part of the cutting edge would leave you with a clean, non-chipping finish.
(Could not tell conclusively from the image, but depth could be different.)
BTW: What is the difference between a Male and Female Dado?
This is 2 flute 5/16 down cut . dept should be the same .
I agree with Jerry it looks like for some reason the female grooves are being routed in a different direction to the males. Either that or in 2 passes. Watch carefully when it's cutting and see if it's making 2 passes & which direction it's cutting.
What are the feeds and speeds you are running with this tool?
Attached is picture of tool setup
What percentage of the feed rate are you running?
100% and i can set that just in material property
here is screen shot of property
your lowering speed seems really high. Could your bit have been damaged and just cut the dadoes after the tenons?
It appears that your part is not securely held.
Also, poor dust extraction can exacerbate this as well.
Something else to look into, I noticed the cuts that are chipping are not parallel to X and Y, they are somewhat diagonal.
Try cutting parallel to X and Y, then try the diagonal cuts again. You may have some oscillation when the machine is interpolating the XY linear moves that is causing the chipping.
i check that ready .
Put in a new tool, and try this.
Try cutting a hexagon approximately 10" in diameter, clockwise.
On the same sheet in the same program, offset the the geometry 5" or so to allow good visibility of the cuts, use the same geometry in the opposite direction, counterclockwise.
Is there any difference in the amount of chipping, and where it occurs in the 2 hexagons?
Please post a picture.
post a picture of the bit....
We just seen the same thing