Would appreciate any help I can get. We are trying to cut miter fold cove backsplash on our solid surface countertops. I have the program set up but having a hard time finding tooling that will hold up.
I too had trouble keeping tooling intact trying to make this cut. We used an amana insert bit to do the v-groove and I bent the tip of the bit (insert broke) and had to finesse the bedding surface back into service. The key is to waste out as much as you can with a roughing pass using a straight bit, and step the final pass in. No matter what we tried, we could not get a good final cut. I think this is mostly because the tip of this style tool is essentially speed zero at the point. If you have an aggregate head, or a way to cut this with something like a shaper cutter (think plowing a dado, just with tapered sides) then I think this could be a productive method. Our CNC Router is only 3 axis, so we couldn't justify the cost for the volume we do, of adding a an aggregate head.
The 45 degree miter fold (for things like drop edges) seems to work OK but It is not perfect on our machine. The bottom of the cut fuzzes up and fills with the chaff from the "slow" moving tip. We clear it out with a pick and some compressed air.
Are you plowing the entire V groove with the V bit? Or are you hogging out the bulk with another tool then just finishing with the V bit? When we miterfold we run a straight tool and hog out everything we can leaving just a 2 pass cleanup for the V bit. 3 passes with a small tool (1/4") will get 80% of the material out of the way for the V bit. I dont think my insert would last at all if I were plowing the whole thing.
But the cove cutter is two 45's (22.5) and the cove as one tool, otherwise two bits with 3-5 passes. We prefer it at the correct angle with the space for the glue line so the cutter doesn't come to a "point"
If I did a lot of counters I would probably pick up a dedicated v groover. They sell used now and then.
I have one that I use for a different application. I also v groove on a CNC. There are advantages to both but for lineal work a dedicated v groover works best. You can get insert heads made like Alan showed but the heads are larger diameter and you can have diamond made also.
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