Hi all
Fairly new CNC user here. I have just gone and checked on a 3d bread plate that I have on the Shapeoko 5 right now, left side is perfect, currently on 3d finish with 1/16 tapered ball end with 10% Stepover and smooth as a baby’s backside however, right side is terribly scalloped. What would be the cause of the right side being so bad compared to the left?
Post a picture, please?
Hey Steve, photos posted.
It looks like your part has moved upwards (towards the bit) since you cut the plate’s flat surface. Something happened in the Z direction between finishing passes.
It isn’t just the right or left sides. It is also happening at the top.
Did this part sit for a long time between finishing passes? Did you move the machine between passes? Just guessing.
The job was about ~5hrs total so it was a longish one. The finish pass in the photo being the longest at 3.5hrs The roughing was about 70mins. The material seemed to be quite secure but I can’t say for sure it didn’t move. My zero XY corner bracket seemed to suggest no movement. This hasn’t happened on any other projects so I didn’t have any idea as to what could be the cause. I think I will cut this one again and see if the same thing happens.
Check your tool settings over.
You said you were using a Tapered 1/16th ballnose and a 10% stepover, = 0.0063 stepover?
That looks like a much larger stepover. maybe around 0.063.?
The only time I have seen something similar was caused by resin and dust buildup on the tip of the bit…?
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