I grind sandstone a lot and thats the reason I use frankfurt stones, they are only $2-3 bucks each and will do about 200sf per set, I use 3 on my swing machine, heavily weighted. The 60 grit flattens without scratches and will remove coatings nicely. One more step (120) and it is usually good to go but you could go to 220. Problem is that they are (at the beginning) 3” tall and that makes them sling slurry everywhere.

Sandstone will toast any resin bond diamonds in 50-100sf, and even nickel bond or electroplated will not last long.

So like I said, I need an EXTRA hard bond metal, preferably not segmented but disks.

> On 9 May 2015, at 7:14 am, Bob Murrell <bmurrell@m3techinc.com> wrote:
>
> Mike,
> Because sandstone is so coarse, any of your abrasives will wear at faster than normal rates.
> There are many variables like will you be doing this wet or dry? Single disc or planetary machine? I am assuming the sandstone is already honed?
> If it is honed and you intend on an initial coarse grind anyway (maybe some lippage too?), I would recommend a metal-bond diamond to start with as they should cut much faster and also last much longer. Depending on the thickness of the coating, maybe a 50g or 70g might work. Then go to the desired level of hone with resins and color enhance(if desired).
> If you can, do some chemical stripping first to alleviate gumming up of the diamonds and floor.
> Just keep in mind that all of your abrasives will wear faster than normal.
> Do a test to confirm procedure and results.
> Good luck,
>
>
> Sent from Bob Murrell's iPhone
> 865-607-0957
> Office 800-342-4533
> www.go2m3.com
>
>
>> On May 8, 2015, at 4:48 PM, Mike Marsoun <nulifesc@bigpond.com> wrote:
>>
>> I have a customer who wants his Indian sandstone (Himalayan) ground. Someone put in a topical that is failing ant it has to come off, probably a urethane. Does anyone know of a good hard bound diamond for this? I usually use Frankfurt stones but this is indoors and they are a mess to work with. Thanks.
>>
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