V-Grooving Stone

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V-Grooving Stone

Postby Leo » Thu Jul 20, 2017 4:09 pm

I have a potential job to "V-Groove" a compass rose into a Blue Stone paver for a customer.

I see some diamond impregnated rotary cutters out there.

Does anybody have experience v-grooving in stone?
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Re: V-Grooving Stone

Postby dwilli9013 » Thu Jul 20, 2017 4:45 pm

Seems I remember a while back in a post someone was cutting pavers on their CNC. I guess the biggest issue was the dust goes everywhere.
I would suspect the rigidity of your machine would play a major role as well.

I myself have been wondering how a Marble tile may come out with a diamond drag bit engraving.
Just not ready to thrash my drag bit yet with a try.
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Re: V-Grooving Stone

Postby Rcnewcomb » Thu Jul 20, 2017 5:02 pm

Marble tile


Marble V-Carves very nicely.
Image
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Re: V-Grooving Stone

Postby dwilli9013 » Thu Jul 20, 2017 5:05 pm

Rcnewcomb wrote:
Marble tile


Marble V-Carves very nicely.
Image


Thanks Randall,
Was that done with a carbide V-Bit? Also feeds & Speeds if you recall.
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Re: V-Grooving Stone

Postby Rcnewcomb » Thu Jul 20, 2017 5:14 pm

This particular piece was cut with the following settings:
PC router at 13,000 (I'd like to run slower but the PC loses too much torque at 10,000)
Feed and plunge rates of 0.1 ips (6 ipm) -- I have gone as fast as 1ips (60 ipm) on other pieces of stone. I'm sure I could have used faster feed rates if I had a better hold down system at the time. Back then I screwed down scrap wood around the marble to hold it in place. I later moved to vacuum pods.

Bit:
I used a Sears craftsman 1/2" V90. Now I'm inclined to use a CMT 3/4" V90 or 1/2" V60. I use a Gerber 1.25" V120 for some applications but haven't tried it with stone yet.

Cooling:
I held a shop vacuum nozzle near the bit which kept lots of air moving. The bit and collet were warm but not hot at the end of the run.
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Re: V-Grooving Stone

Postby dwilli9013 » Thu Jul 20, 2017 5:25 pm

Thanks Randall.

Sorry Leo I wasn't intending to hijack your thread.
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Re: V-Grooving Stone

Postby Leo » Thu Jul 20, 2017 5:52 pm

Don't be sorry.

I am thankful to be generating discussion about it.

Diamond Cutters.jpg


Has anybody used anything like this

I have used Carbide to cut marble before.
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Re: V-Grooving Stone

Postby Jane Ndungu » Thu Jul 20, 2017 6:12 pm

Hello Vectric,

Kindly let me know if my CNC for wood can also engrave on Marble and other material.
If yes this would be so so good.

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Re: V-Grooving Stone

Postby Jane Ndungu » Thu Jul 20, 2017 6:14 pm

Rcnewcomb wrote:
Marble tile


Marble V-Carves very nicely.
Image



Hello Randall,
Could you kindly let me know where you got this file from.

Thank you
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Re: V-Grooving Stone

Postby Rcnewcomb » Thu Jul 20, 2017 6:55 pm

Regarding Leo's original question regarding paver stones, I don't have any experience with those.

Kindly let me know if my CNC for wood can also engrave on Marble and other material.

V-Carving on Marble, limestone, or soapstone can be done with a router that can handle hardwoods. No special bits or cooling is required. Regular carbide bits work fine. Slow the feedrate down a bit from what you would normally use with a dense hardwood. Keep your pass depth fairly shallow.

Could you kindly let me know where you got this file from.

It is from the VectorArt.com Mega Collection #1, Image ID: 32809L You can purchase the individual file from them for $2.
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Re: V-Grooving Stone

Postby Leo » Thu Jul 20, 2017 7:05 pm

Jane,

I have cut Marble with a Carbide V-Groove Cutter and is worked - OK, but the process was very slow and it really beat up the cutter.

The job I am asking about now is stone and a much larger project. I will be cutting into a stone 24 x 24 x 2" thick.
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Re: V-Grooving Stone

Postby phill05 » Sat Jul 22, 2017 1:22 pm

Leo,

Stone is more abrasive than marble what I do is grind my own cutters and use a 3 face \/ cutter 15 deg to 60 deg use plenty of water to wash away the dust to keep a clean cutting edge so it's not re-grinding the dust again, you would need to be cutting slowly DOC I work on 5mm you will tell from the sound the machine is making when you are about right for FPS as stone varies in density/hardness.
The test piece image shows the amount of dust washed out so if the machine is your pride and joy and not use to the amount of abuse or water you will put on it I would be careful.

Phill


P8292395_.jpg
head_4_.jpg
Test piece_.jpg
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Re: V-Grooving Stone

Postby Leo » Sat Jul 22, 2017 3:23 pm

Phil - PERFECT - this is what I need to know.

Are you using carbide cutters?

What you are grinding for 3 face cutters - Carbide?

Are you using High RPM - or Low RPM on the spindle?

I will need to make some kind of water tank to capture the slurry and protect the machine.

Thank you

Do you have any further recommendations?
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Re: V-Grooving Stone

Postby Leo » Sat Jul 22, 2017 7:01 pm

I had a dremel tool carbide burr. Not the highest quality cutter, 1/8 shank. I called it a 1/8 ball nosed cutter.

I set 10,000 RPM on the spindle and feedrate at 10 IMP DOC at .01

I used a spray bottle with water and stream. Depth into stone 1/16. Just made sure the stone was well and puddles around the cutter.

I cut a small oval and it looked great.

I that tries 3 letters. The cutter failed on on letter #2 about 80% through.

I have a LOT of different cutter variations on order both Diamond impregnated and carbide blade.

At this point I am confident that cutting stone is certainly a do-able thing to do.
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Re: V-Grooving Stone

Postby phill05 » Mon Jul 24, 2017 9:23 am

Hi Leo,

Sorry it took a while to get back , you found out the normal cutters soon wear out because they are too sharp for stone, I buy in carbide rod to shape up either radius end or V and grind 3 faces into them grinding them to get very little back relief making for a stronger cutting edge that does not rub off too quickly, normal carbide cutters cut work fine in marbles and resinbonds but stone needs that little bit more if you have a lot to cut then you might look at PCD (diamond)

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