Deleted
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Post by Deleted on Mar 24, 2019 5:35:27 GMT -5
Hello all, Loving this forum, it is one of my 1st visits every morning. I occasionally get this issue and never figured out why. The profile cuts 491 and circle were the same tool path (Vcrave pro, .25 2 flute straight bit, 100 ipm, plunge 50ipm, depth .125) The circle profile is smooth, but the numbers have missed spots? The 2nd tool path (hello spring) has the same missed spots? I even changed to a 1/8th bit and slowed down feeds and speeds, as well as run a separate clearance pass of 0.05 and then 0.01. I also tried upcut 1/18th bit, climb, conventional and plunge, but always exactly the same areas missed? I still get "missed spots" HELP Thank you
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Post by Mezalick on Mar 24, 2019 9:46:47 GMT -5
Sometimes that can be caused by the movement of the material ..
Michael
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Post by stevem on Mar 24, 2019 10:35:01 GMT -5
It almost looks as if the piece isn't completely flat and there is some movement up and down as Mezalick has stated. When I am making a blank that size, I make it with wood strips no more than 3" wide and reverse the grain every other strip. I then run it thru my drum sander to make sure it's as flat as it can be.
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Deleted
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Post by Deleted on Mar 27, 2019 3:12:42 GMT -5
Morning gents, The material was rock solid and remained in the same position while running the same toolpath multiple times. Each time making slight variations trying to clear the bottom of the pocket. The same areas were consistently missed? The circular pocket was run before the "hello spring" toolpath with no issues. 1st 491 - missed spots 2nd circle pocket - good clean 3rd hello spring - missed spots
I really appreciate your help Thank you Andy
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Post by Mezalick on Mar 27, 2019 3:28:03 GMT -5
What software are you using ?
Michael
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loren
New Member
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Post by loren on Mar 27, 2019 9:52:45 GMT -5
Are you using a clearance bit and a smaller profile bit? It kind of looks like that - pretty small radius corners. If your Z axis isn't precisely set, you can get this effect.
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Post by Axiom Tool Group on Mar 27, 2019 11:15:36 GMT -5
As mentioned, using two different bits has been known to cause this to happen.
On trick to help with that is to set your Z-0 on the spoil boards (bottom of the material) instead of at the top....this lessens the difference in reference points when changing bits and resetting the Z-0.
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Post by redwood on Mar 27, 2019 13:49:41 GMT -5
I use a larger clearance path all the time and sometimes I get a shadow line, but nothing like that.
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Deleted
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Post by Deleted on Mar 27, 2019 18:14:11 GMT -5
I only used a .25 2 flute straight bit no clearance bit. My final attempt was a 1/8 upcut bit but still the same spots not cleared. I really did try everything I could think of and searched google before reaching out. If the circle pocket had the same problem I would have said errors in the toolpath settings or hardware issue but the circle is clean and flat?
Thank you for taking the time to help.
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Post by Axiom Tool Group on Mar 28, 2019 14:12:00 GMT -5
Is your collet locked into the collet nut?
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Deleted
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Post by Deleted on Mar 28, 2019 19:20:20 GMT -5
Yes
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Post by bentley on Mar 29, 2019 19:34:08 GMT -5
Hi, this is my first time posting. I'm not sure if you've found a solution to you issue yet. First which type of 2 flute cutter are you using? Router bit 2 flute straight, or 2 flute spiral endmill? Also when you are pocketing are you using offset or rastering. I was using offset at first but since I switched to Rastering cutting my pockets are very clean. The only time I get a small bit of material height change is when I use a large area clearance tool and then finish off my radius with a much smaller cutter. This can be very easily cleaned up.
Bentley
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Deleted
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Post by Deleted on Mar 30, 2019 5:21:47 GMT -5
Using a 2 flute straight, I tried offset and raster, with no clearance bit change.
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Post by bentley on Mar 30, 2019 10:01:31 GMT -5
Using a 2 flute straight, I tried offset and raster, with no clearance bit change. Try using a spiral downcut endmill. Or even a 4 flute once you do all the clearing out with the 2 flute. I know that sometimes depending on the type of 2 flute straight the cutters can actually leave a section on the bottom of the cut uncut. Hope you get it figured out cause I know its a pain ruining good wood. Bentley
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johnb
Full Member
New owner @ March 2019, AR16 Elite, Aspire, 4th Axis & Laser
Posts: 326
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Post by johnb on Mar 30, 2019 10:01:45 GMT -5
Something moved. Nobody (yet) has asked if your spindle is tight in the gantry?
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Post by Axiom Tool Group on Apr 8, 2019 14:16:20 GMT -5
Andy, is this a new problem?
With the machine being about 1.5years old, we'd imagine that something may have loosened a bit to allow for some very small amount of play....such as the retaining nut found below the stepper motor and coupling for the Z axis.
The coupling itself could be worn, or the ball nut bearings in need of service.
Have you greased those bearings recently? This should be done approx. every 500 hours of machine use...in addition to the regular daily topical lubrication.
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Post by dadealeus on Oct 24, 2020 1:55:33 GMT -5
I know this is an incredibly old post, but I had this same problem. It turned out to be the dust brush that Axiom offers. The bristles are very stiff and if there is even a slight bow in the center of the workpiece (where your clamps are not holding it to the machine), the bristles will move the material up and down as the tool performs its work and you'll get irregular cut depths.
This is easy to check by simply removing the dust brush and running the exact same path. If you run the same path without anything except the tool physically touching the workpiece and there are not height irregularities, then you have confirmed this is the issue.
The solution is to either flip your workpiece so that the bow in the wood points downward (so the edges flare up instead of the center). Then you can clamp down the flared edges and the bow will hold it to the machine in the center.
Otherwise, you may need to screw the center of the workpiece into your spoilboard to hold it down. Just make sure it's in an area the tool won't dig into.
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