M18 7/9" grinder experience?

[signcrafter]

Anyone have experience with the m18 7/9" grinder? I have the 4.5/5" grinder and it does great. Except I have so.e bigger wheels for grinding concrete and glue removal/surface prep and it doesnt like them. Normally I run those on my bigger corded grinder but doing a job where house has no electricity. I have a generator but I'm almost all cordless anyway so if this grinder will handle the bigger wheels like a corded 7" grinder I will just pick it up. Just looking for some real world experience so I dont spend the money and it cant handle the bigger wheels like a corded version can. Thanks

 

[Xcursion88]

Your brake won't work as effective but that's really the only issue.
If using all the time a bigger grinder is needed but short term it's fine

 

[signcrafter]

Your brake won't work as effective but that's really the only issue.
If using all the time a bigger grinder is needed but short term it's fine

Not too concerned with the brake, usually when using these bigger wheels they are on a hard surface and as soon as you let off the trigger they stop as long as they against something.

Won't be using it all the time but when I will need it I will be using it for up to an hour or so at a time. Usually not a constant hour but a few minutes and then maybe a minute or two break and then back at it. Dust control would also be nice. I have a shroud for my 4/5" grinder and will have to look into one for the bigger one if I get it.

 

[GaryM909]

I have a couple of cordless Dewalt grinders that I can use 6" discs with a guard. They have lots of jam - pretty much the same as corded. I have three 9ah batteries. I had to do some heavy grinding a couple weeks ago and I wouldn't get an hour usage with one battery. Also the batteries take quite a while to recharge. I didn't time them though.
The Milwaukee grinder would probably have close to the the same characteristics. You would need a couple of batteries to keep going or take long breaks. I did end up running power and using my corded grinder to finish the job.

 

[dnschmidt]

I've got one but truthfully it's still in it's sealed box. However, I'm sure if needed it will do the job but you're going to need the big cell batteries 6.0, 8.0 or 12.0. To get the machine to use it's full potential. So, how do I know this if I've never used it? I've got the Milwaukee polisher (same thing slower speeds) and I've used it extensively and the 6.0 and 8.0 batteries are the way to go as they have the amp delivery to handle the load. 12.0 is just too damn heavy. You can get by with the 5.0 but with these you can tell that it's a cordless tool. With the bigger batteries you can't.

 

[trackwelder]

I have the 9” grinder and my only complaint is it’s a battery hog.

 

[DieselSaves]

I have the 9” grinder and my only complaint is it’s a battery hog.

I use my big Milwaukee grinder with a 7” grinding wheel and it is an animal. Mine will only operate properly with the 3, 6, 8 and 12 ah High Output batteries. Standard batteries, even my 9.0 bats won’t run it. The grinder will run for a minute or two with a non HO battery then shut off and the battery needs put on the charger to reset.

I like the grinder and had planned on buying the bigger batteries anyway but it’s worth mentioning if you buy the grinder bare tool that you should have or get the HO batteries, at least from my experience.

 

[trackwelder]

I use the 8 or 12 HO batteries as well. Definitely a great tool, and I rarely pull out the big electric grinders anymore.