Bit Deflection Help
Posted: Tue Jan 27, 2015 9:40 pm
Hey all,
New to CNC here, but I have been lurking for months now.
I'm having an issue with bit deflection and could use some guidance in what to look at to help identify the specific issue.
Bear in mind that I am noticing this now, after having a cut go awry last night and bog down the router and blow the power fuse.
I am cutting 3/4 MDF with a homemade laminate formica top. I am using a .25 downcut spiral (but this was happening on an uncut also).
I have attached a screen capture of my tool settings. I have also attached a picture of the cutting diagram.
Here is what I was seeing:
-- When the router was plunging to start the cut the whole arm holding the router was flexing up, so that the router was tilting until it forced itself into the cut. I am assuming that this is due to the formica being hard to start the cut?
-- In doing my cuts I saw that my passes were off as they proceeded down in depth. For example:
-- On the long center piece, the right side of the piece was (which is the top right edge on the diagram) it was cut about 1/4 inch shorter on the top 2 passes that it was at the through cuts. On the left edge of the same piece it was cut longer on the 3rd and 4th passes.
-- On the two circle on the right side of the drawing, they experienced a similar problem, however the offset was different, too long on the bottom arc of the top circle (smaller on the same side) and too long on the top of the bottom circle. It didn't appear that the offset matched on those two circles.
My biggest concern is that when I had my issue last night I bent/broke/got something out of alignment and I'm not sure what I should be checking.
Any help would be much appreciated.
Thanks,
Bill
New to CNC here, but I have been lurking for months now.
I'm having an issue with bit deflection and could use some guidance in what to look at to help identify the specific issue.
Bear in mind that I am noticing this now, after having a cut go awry last night and bog down the router and blow the power fuse.
I am cutting 3/4 MDF with a homemade laminate formica top. I am using a .25 downcut spiral (but this was happening on an uncut also).
I have attached a screen capture of my tool settings. I have also attached a picture of the cutting diagram.
Here is what I was seeing:
-- When the router was plunging to start the cut the whole arm holding the router was flexing up, so that the router was tilting until it forced itself into the cut. I am assuming that this is due to the formica being hard to start the cut?
-- In doing my cuts I saw that my passes were off as they proceeded down in depth. For example:
-- On the long center piece, the right side of the piece was (which is the top right edge on the diagram) it was cut about 1/4 inch shorter on the top 2 passes that it was at the through cuts. On the left edge of the same piece it was cut longer on the 3rd and 4th passes.
-- On the two circle on the right side of the drawing, they experienced a similar problem, however the offset was different, too long on the bottom arc of the top circle (smaller on the same side) and too long on the top of the bottom circle. It didn't appear that the offset matched on those two circles.
My biggest concern is that when I had my issue last night I bent/broke/got something out of alignment and I'm not sure what I should be checking.
Any help would be much appreciated.
Thanks,
Bill