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Discuss Variable Speed Grinder in the Tiling Tools area at TilersForums.com.

C

Concrete guy

Gary probably has a 9565cvl which Makita no longer make, which is a shame as it was a very good machine and generally bomb proof.

It's been replaced with the SA5040 which is no where near as good.

If you want a polisher go for a Flex L1503 (1200-3700 rpm) <----dedicated polisher.

If you want a variable speed grinder then the Flex L1506 (2200rpm-6800rpm) <----a slower grinder than can do a bit of polishing

When buying a variable speed machine (whatever manufacturer) choose something that's going to be used closer to the higher end of it's speed range. You'll find it has a longer life span and won't overheat when used for extended period of time.
 
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C

Concrete guy

Most of the non-variable speed grinders I've looked at have an RPM of 10000 upwards. Is there any advantage or disadvantage to cutting at 6800?

You need a slower speed range when cutting shaped or curve, particularly with dished blades. It reduces grabbing and kickback.

Also you'd run profiling tools at around 4000rpm, the reduced speed gives more control and allows the head of the tools to remain in contact with the work piece for longer. A profiler run on a normal grinder at 10,000 or 12,000 rpm kicks and bounces and is just difficult to control.

So if you want to sum it up in a single word - control.

Most variable speed grinders we sell are going to landscapers for profiling and shaping. The majority of polishers we sell go to stone masons. There is plenty of cross over though.

We also have heavy duty machines for companies that may be producing pool copings or similar, the FLEX LW802VR fits this category.
 

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