angle grinder in kneecap

I have a corded Makita 4" that will not die and a corded Bosch that is either 12" or 14". It has to be on a 20 Amp circuit or the initial amp pull will trip the breaker. Never cut myself with either one and like @flushcut I'm never complacent with either one. The big Bosch tries to run away and go into business for itself if you don't hold on tight hahaha
 
On the subject of grinder safety, confirming the disk rpm rating meets or exceeds the speed of the grinder is not a bad idea. It may be hard to get an underrated disk for a 4.5" grinder, but possible for larger sizes. Years ago we had an employee injured by a disk that came apart (heavy industrial setting.) While he's at the hospital, his coworker continues the job. He gets some new disks from the facility warehouse and starts cutting/grinding. Disk comes apart and he's off to the hospital too. Turns out, a vendor supplied an out of spec disk for that commodity with a speed rating too low for the high power grinders the mechanics typically use. Warehouse staff did not check the rpm rating when the disks were received nor did the mechanics check the rating before using them.
 
Dan Cobb said:
On the subject of grinder safety, confirming the disk rpm rating meets or exceeds the speed of the grinder is not a bad idea. It may be hard to get an underrated disk for a 4.5" grinder, but possible for larger sizes. Years ago we had an employee injured by a disk that came apart (heavy industrial setting.) While he's at the hospital, his coworker continues the job. He gets some new disks from the facility warehouse and starts cutting/grinding. Disk comes apart and he's off to the hospital too. Turns out, a vendor supplied an out of spec disk for that commodity with a speed rating too low for the high power grinders the mechanics typically use. Warehouse staff did not check the rpm rating when the disks were received nor did the mechanics check the rating before using them.
Click to expand...
I always check, although we have atleast one disc in the shop right now that doesnt have an RPM rating marked on it, and a hard rock thats 3 years out of date, I dont use either, I bought some new cuttoff discs and a hard rock the other day
(Diablo makes some decent ones, although they tend to hop when the wheel is worn, making the wheel almost visibly get smaller)
my grinder is only 11K rpm, and it seems most 4 1/2" discs are rated at 13K and above, but I still check, ive had dremmel discs break on me, none hit me but its still terrifying
 
flushcut said:
The 7" Milwaukee I have is scary 9" would be terrifying. TORQUE!
The cordless is real handy for cabling.
Click to expand...
can we get a review on yours? I wouldnt mind having one in a few years for big jobs
cordless seems like a good idea, but runtime usually sucks, especially for a shop environment
 
Reach said:
I’ve been looking at that grinder lately, just haven’t convinced myself to pick one up. Your “review” there may have just made me do it... Have you run it alongside a corded 7”?
Click to expand...
Are you talking the 4.5" cordless vs the 7" corded? 7" hands down victor! Not even the same game kind of defeat. That being said the 4.5 m18 is real nice for a 4.5" and handy as hell for cabling. Actual day in day out shop use you are going to use up some batteries but not as many as you think. I built a loading dock for a buddy out of an old trailer two 5amphr's in rotation is all I ever needed.
 
flushcut said:
Are you talking the 4.5" cordless vs the 7" corded? 7" hands down victor! Not even the same game kind of defeat. That being said the 4.5 m18 is real nice for a 4.5" and handy as hell for cabling. Actual day in day out shop use you are going to use up some batteries but not as many as you think. I built a loading dock for a buddy out of an old trailer two 5amphr's in rotation is all I ever needed.
Click to expand...
I’m talking about the 7” cordless vs a 7” corded. We have the 4.5” corded and cordless already, but not a 7” cordless.

Little secret for cabling - M12 bandsaw is amazing. Designed to be used with one hand, no sparks/flying debris, and it’s smooth and quiet. We have one for just that purpose and would never go back to a grinder.
 
I once got the top 1/4" of my thigh and jeans sucked into the gap of a big hand belt sander that was just spinning down. I was hot, tired, my arms ached from holding up the sander and I let it droop a bit too much. It never broke the skin, but left a green and purple pattern and I lost the feeling in a good size patch of skin. It hurt like hell for a few moments. I think there was also a swelling pattern in the bruising colorfest.

Respect power tools, for sure.
 
Bart_ said:
Respect power tools
Click to expand...
I hate feeling like im treating my friends like they are stupid, but then again, just about anything I find "Normal" is NOT normal for someone my age or younger (Welding, fabrication, tree climbing, power tools, chainsaws, etc)
little do most people seem to understand, all this stuff can kill you either instantly or really painfully if you do not 100% understand and know what your doing

treat tools with respect (yeah yeah, im one to talk)
 
Taking the OSHA 511 class opened my eyes to the dangers of grinding wheels. Both handheld grinders and bench grinders injure and kill workers. Wheels coming apart seem to be a frequent cause which makes sense considering the RPMs those things are spinning. Convert that RPM to feet per second and essentially you have a bullet when those things come apart. During the class we watched quite a few videos of workers being injured with various grinders. Pretty horrifying.
 
RyanCafferky said:
Taking the OSHA 511 class opened my eyes to the dangers of grinding wheels. Both handheld grinders and bench grinders injure and kill workers. Wheels coming apart seem to be a frequent cause which makes sense considering the RPMs those things are spinning. Convert that RPM to feet per second and essentially you have a bullet when those things come apart. During the class we watched quite a few videos of workers being injured with various grinders. Pretty horrifying.
Click to expand...
Grinders should be terrifying, for sure! We tend to not respect them because they don’t have teeth, but the are definitely dangerous. I learned young the power and dangers involved with big grinders, I’ve had some cuts/burns from various grinders, and I’ve been hit by cut off wheels that blew up - that’s exciting, to say the least.
 
flushcut said:
Ahhhhh I have not used the 7" cordless but the 7" corded is a tank meant to destroy.
Click to expand...
Yes, I’m sure it is! I haven’t run the new corded, but I have way too many hours running an ancient 7” (metal case, wood side handle) and that thing will move something - you or the wheel, it doesn’t care, something is going to turn when you squeeze that switch!
 
"We tend to not respect them because they don’t have teeth"

You want to talk terrifying. I once did some stuff for a professional carver/sculpter and he had a carving wheel for his 4 1/2" angle grinder - 13,000 rpm - that consisted of a steel wheel with chainsaw chain mounted around the edge! He kept it razor sharp.

I shudder to think...

Hello kickback ...
 
Njdelaney said:
Those chainsaw teeth grinding wheels are ridiculous, unnecessary and dangerous. There is a better solution called an arbortech turboplane. Much safer and actually more effective.
Click to expand...
My ole landlord got one of those wrapped around his hand. They managed to sew his fingers back on. I think completely severed one, one was hanging by a tendon and the other 3/4 though the bone.
 
Had my jumper ripped off me from catching a fibre on a 250mm bench grinder... those tool rests are very handy, didn’t get a scratch...
 
You must log in or register to reply here.

New threads New posts

Back
Top Bottom