Author Topic: Cutting Granite  (Read 4832 times)

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Offline vkumar

  • Posts: 390
Cutting Granite
« on: April 06, 2018, 04:27 PM »
I need to replace a cooktop on my granite countertop. The new cooktop needs a 2 inch wider cutout than existing.

I am trying to get a a granite guy to come an do it but am having a heck of a a time to get someone to come and do it.

So not that I want to do this myself, but was wondering if I were to do it myself, how would I go about doing it.

1. A diamond blade
2. A worm gear saw ?  I have  worm gear Skilsaw. I also have a TS 75
3. A disc grinder . I have one.
4. Water sprayer?

If any of you have done this I would appreciate how to tips.

Vijay Kumar

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Offline Brice Burrell

  • Posts: 7363
  • Remodeling Contractor
    • The Green and Dark Blue blog
Re: Cutting Granite
« Reply #1 on: April 06, 2018, 10:01 PM »
I have not do this myself but I know others that have.  Take the countertop outside and dry cut with a grinder with a diamond blade.  Be careful moving the granite, it is very heavy and fragile at the cooktop cutout area.     
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Offline vkumar

  • Posts: 390
Re: Cutting Granite
« Reply #2 on: April 06, 2018, 10:18 PM »
Brice thanks for your advice. Unfortunately this is an existing countertop and this will be new stove in an existing undersized cutout. No possibility of taking the counter out.
Vijay Kumar

Offline denovo

  • Posts: 57
Re: Cutting Granite
« Reply #3 on: April 06, 2018, 10:34 PM »
I ended up doing this for a client who also couldn't find a granite guy for the job.  I used a grinder with a smooth rim diamond blade attached to a sled I made to travel down a guide rail for a straight 90 degree cut.  The guide rail was attached to the counter top using the gecko clamp.  I attached a vacuum hose to the sled to capture as much dust as possible and had an assistant spraying the blade with water while cutting.  It still produced a lot of dust but it worked and got the job done! 

Offline Peter_C

  • Posts: 779
Re: Cutting Granite
« Reply #4 on: April 07, 2018, 12:19 AM »
I would assume the edges are covered by the cook top? If so I would use a 4 1/2" grinder with a top quality blade. A dust collector/vacuum can be held by someone else, which should catch 85%. Two hands on the grinder and brace your arms.

Edit: Like this one.

Edit 2: Round corners don't crack, but square ones do. Pre-drill the corners with a diamond bit and use plenty of water. You should be able to use a wet dry vac, a towel, or a bucket of some kind to contain the water. At least a 1/2" hole.
« Last Edit: April 07, 2018, 12:27 AM by Peter_C »

Offline vkumar

  • Posts: 390
Re: Cutting Granite
« Reply #5 on: April 07, 2018, 01:33 AM »
Thank you all. Very helpful.
Vijay Kumar

Online JimD

  • Posts: 371
Re: Cutting Granite
« Reply #6 on: July 14, 2018, 07:57 PM »
I was here when the installers brought in our counter tops last year.  They are granite.  They did not totally cut out for the cooktop so the slab was less fragile.  They finished the cuts with an angle grinder with a diamond blade and the second guy used a shop vac to minimize dust.  There was still a lot of dust for me to clean up. 

Offline TinyShop

  • Posts: 344
Re: Cutting Granite
« Reply #7 on: July 15, 2018, 09:47 AM »
For improved dust collection when using an angle grinder (ideally, as others have mentioned, in conjunction with a guide rail) why not make use of something like this?

Haven't used one personally but it seems like it might do the trick.

ETS 150/5 EQ (DE) [po], TS 75 EQ (DE) [po], OF 1400 EQ-F (DE) [n], CXS (DE) [n], CMS-GE [DE] [po], CMS TS 75 (DE) [n], LA-CS 50/CMS (DE) [po], VB-CMS (DE) [n], MFT/3 (CZ) [n], DF 700 EQ w/Seneca Small Mortise Kit (DE) [po], FEIN Multimaster 350 QSL (DE) [n], Bosch 1274DVS w/dust collection, sanding frame,  stand & fence (CH) [n], BOSCH 1590EVS w/dust collection (CH) [n], CS Unitec CS 1445 HEPA extractor <re-branded Starmix ISP 1435 H> (DE) [n], CT SYS (DE) [po], Milwaukee 0302-20 (US) [n], Two (2) Porter Cable 862 (TW) [n], Porter Cable 447 (US) [n], Zyliss Vise (CH) [n], Hitachi C 8FB (JP) [h]

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Offline Oldwood

  • Posts: 365
  • Alberta, Canada
Re: Cutting Granite
« Reply #8 on: July 15, 2018, 09:50 AM »
If you have drawers below the cook-top the dust will destroy the roller guides. Best to remove them before you cut. Also if you can use some poly to contain the dust to one area , that is worth doing and as has been said a vacuum.
Real knowledge is to know the extent of one's ignorance.

Offline Cheese

  • Posts: 6365
Re: Cutting Granite
« Reply #9 on: July 15, 2018, 10:43 AM »
Here's a grinder that Festool sells.   

I've used an ATS diamond blade on a TSC 55 and a rail to cut porcelain tile. ATS also sells diamond blades for cutting granite & quartz.

Offline rst

  • Posts: 2226
Re: Cutting Granite
« Reply #10 on: July 15, 2018, 02:32 PM »
While Festool does not sell their grinder over here, Metabo does...Metabo W12-125 HD Set CED Plus and it will work with Festool tracks...I use Makita tracks, save my Festool tracks for fine work.

Offline blaszcsj

  • Posts: 457
  • I like building stuff with my hands.
Re: Cutting Granite
« Reply #11 on: July 15, 2018, 02:51 PM »
+1 on ats and tsc 55.
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Offline Tinker

  • Posts: 3717
Re: Cutting Granite
« Reply #12 on: December 14, 2018, 08:34 PM »
I would cut it in place. If you have not handled granite before, it is extremely brittle and it will surely break if you try to move it outside. If you have hot air heat, be sure to tape all the cold air returns. A good idea to cover the heat ducts as well. One time, I forgot. I am lucky to be having this discussion. The responder who suggested drilling the  corners of the cut gave good advice also.
Wayne H. Tinker