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Cutting Miter fold Cove backsplash in solid surface

Chris Ellis  Member

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.

2/23/21       #2: Cutting Miter fold Cove backsplash ...
Mark B Member

How are you miter folding cove?

2/23/21       #3: Cutting Miter fold Cove backsplash ...
Chris Ellis  Member

We currently using 45 degree V- groove and 3/4 Bullnose bit. V-groove bits keep snapping.

2/23/21       #4: Cutting Miter fold Cove backsplash ...
Dropout Member

How do you snap a 45?

Pic please.

Feeds and speeds?

2/23/21       #5: Cutting Miter fold Cove backsplash ...
BH Davis  Member


Please forgive my ignorance but I don't see how this is even geometrically possible.

I didn't really need to post that but I want to see updates on this thread.

BH Davis

2/23/21       #6: Cutting Miter fold Cove backsplash ...
Chris Ellis

This is a picture of what I'm trying to cut.

Click the link below to download the file included with this post.


2/23/21       #7: Cutting Miter fold Cove backsplash ...
Alan F.

This is what we used to use on a 3 axis machine, we use a similar cutter on a 5 axis machine

Click the link below to download the file included with this post.


2/23/21       #8: Cutting Miter fold Cove backsplash ...
Alan F.

I should note that tool is designed for a horizontal planing aggregate on a 3 axis machine, we can't use that on a 5 axis so its built into a bit and the spindle is horizontal.


2/24/21       #9: Cutting Miter fold Cove backsplash ...
Stuart Douglas

Alan F nailed it, you need an agregate head.

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.

Hope this helps.

2/24/21       #10: Cutting Miter fold Cove backsplash ...
Chris Ellis  Member

Thanks everyone for you thoughts all good info.

2/24/21       #11: Cutting Miter fold Cove backsplash ...
Mark B Member

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.

2/24/21       #12: Cutting Miter fold Cove backsplash ...
Alan F.

You can't do a true miter-fold in solid surface, you need to leave space for glue so the tooling needs to be adjusted so all the glue doesn't squeeze out.

You can also go the Betterly method, which is a good tool to have for field joints.


2/24/21       #13: Cutting Miter fold Cove backsplash ...
Mark B Member

The common miter fold bits out there are a degree over 90 (91 degree) so they leave a glue line.

2/24/21       #14: Cutting Miter fold Cove backsplash ...
Alan F.

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"

2/25/21       #15: Cutting Miter fold Cove backsplash ...
rich c

Amana makes a great insert bit.

2/26/21       #16: Cutting Miter fold Cove backsplash ...

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.

It avoids beating up a CNC.

2/26/21       #17: Cutting Miter fold Cove backsplash ...
Alan F.

The advantage to a solid surface top on CNC vs a lineal machine is you can do sink holes, faucet holes, accessory holes, inserts, drop ends, drop faces and the coved splash.

A feed through machine is a definite advantage to large runs on lineal like solid surface wall cap with drop edges.

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