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Post by nlalston on Feb 10, 2021 7:15:08 GMT -5
Just very recently, I started another project of a 24" round sign, and traveled through the process of planing it on my CNC. The result was that there were a fair amount of circular, witness lines running through a good portion of the stock. The bit used was from my Amana 9-pc bit set, and was the 1-1/8" surfacing bit. The depth of cut was either 1/16" or 1/8" (I don't rightly remember, but think it may have been the former mentioned). The leftover condition required sanding, indeed.
Shortly after first getting my Iconic 8, a few months ago, I surfaced my spoil board with that same bit, and without issue. Now, if I had chosen a 1/8" depth of cut, might that have been a bit too aggressive - and causative of what I have experienced?
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Post by germanguitars on Feb 10, 2021 8:32:09 GMT -5
If the lines were mostly in the center of the 24" sign I would suspect that the stock was vibrating in the more flexible center area.
What was your hold-down method?
What was the material?
Did the bit have much up-shear?
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Post by nlalston on Feb 10, 2021 9:11:51 GMT -5
If the lines were mostly in the center of the 24" sign I would suspect that the stock was vibrating in the more flexible center area. What was your hold-down method? What was the material? Did the bit have much up-shear?
1). Hold-down method?
Blue tape/super glue (I had stood away from that method, for a while, and decided to give it another shot.
2). Material?
Pine.
3). Up-shear?
I honestly don't know what that means.
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Post by germanguitars on Feb 10, 2021 10:06:11 GMT -5
gdptooling.com/up-vs-down-shear-router-bits/ "The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion. This results in unacceptable vibration and movement of the panel."
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Post by nlalston on Feb 10, 2021 12:37:26 GMT -5
gdptooling.com/up-vs-down-shear-router-bits/ "The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion. This results in unacceptable vibration and movement of the panel." Thank you, for the explanation. Much appreciation. |
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