Wow. thanks Eesakiwi for all that detailed information. It's very good to know.With grinders, I'd suggest, get a 9 inch grinder first & get someone to teach you how to use it.
Get one with a 'disc lock, so you can remove the disc easily, maybe even get a better spanner for it, the originals don't seen very good for some reason.
Get one with a 'over center' locking guard, no extra tools to need or loose that way.
The most important fact to know, is that no matter what you are doing, if you let go of it, it should pull away from you.
Leaving you clear of the grinder. Allways.
I set the guard at about 20 degrees clockwise of it being square off the grinders centreline.
Then I let the far away edge of the guard touch the job, then move the grinder around till the disc touches the job, & then grind like that, not always with the guard touching, but close.
When you put it down, make sure the disc doesn't hit the ground first, they don't like sideways pressure & that'll make then crack & then when you start it up, the disc disintegrates..
That'l get you really really hurt. Grinder cuts take ages to heal & never heal up good.
Always unplug the grinder when you go to change the disc, I tuck it into my armpit as once someone picked up the plug thinking it was for somethings else & plugged it in...
Make sure the screws around the head are tight all of the time, between that & having a hot spark short out some windings, nothing else goes wrong with them.
Discs & brushes are replacement items.
More soonish...
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