Do all grinders get hot?

[Merkava_4]

Is it normal for a grinder to get so hot that you can't touch the metal gear housing? Talking about a right angle grinder.

 

[angellonewolf]

if you use it long enought yes i used a muli tool for a long time and that was getting hot to touch so much so i stoped every so offten to let it cool down

if its the gear box thats hot could do with some grease put in there ?

 

[Smallfry]

Be careful with grease though, its a high speed tool and needs the CORRECT grease.

I once regreased an angle grinder for this reason, and it made it even hotter !

 

[Merkava_4]

if you use it long enought yes i used a muli tool for a long time and that was getting hot to touch so much so i stoped every so offten to let it cool down

if its the gear box thats hot could do with some grease put in there ?

I changed the grease on it today and seems to be running a little bit cooler. I changed it over to that full synthetic Super Lube grease.

 

[Merkava_4]

Be careful with grease though, its a high speed tool and needs the CORRECT grease.

I once regreased an angle grinder for this reason, and it made it even hotter !

The way this grinder is set up, if I put too much grease in there, it blocks the airflow from the fan. I have to be real careful.

 

[hotponyshoes]

What discs/consumables are you using?

You might want to look at something more effective, or use a bigger grinder.

Although I've had mine running too hot to touch with no ill effects before

 

[bricol]

Be careful with grease though, its a high speed tool and needs the CORRECT grease.

I once regreased an angle grinder for this reason, and it made it even hotter !

Got to be careful not to overfill - with a sealed gearbox with nowhere for the excess grease to go, it will heat up and fail. For machinery with regular relube intervals (to supply fresh grease due to heat, speed, life etc) you design in grease valves to allow the excess to vent without damage to seals etc.

 

[Morrisman]

I think the gears are shimmed to get the right clearance. I vaguely remember buying one years ago that had zero backlash between the gears, so I adjusted it and it ran cooler.

 

[hotponyshoes]

I think the gears are shimmed to get the right clearance. I vaguely remember buying one years ago that had zero backlash between the gears, so I adjusted it and it ran cooler.

You can often find that info on the parts diagram

 

[gaz1]

to be honest if your not stopping after 15 mins to allow for cool down

then its not good for your hands never mind your gear either

i have come across some bad grinders that get so hot in less time than 15 mins what i payed a decent price for them sometimes cheap isnt always better

 

[Merkava_4]

What discs/consumables are you using?

You might want to look at something more effective, or use a bigger grinder.

Although I've had mine running too hot to touch with no ill effects before

I've been running the Benchmark cut-off wheels quite a bit lately. The grinder is a Bosch 1375A. It does quite well, but I was concerned about the heat build up in the gear housing. I have since cleaned out the gear housing and applied Super Lube grease #21030. The grinder seems to be doing better, although still not running ice cold. Thank You for your reply.

 

[brightspark]

I've been running the Benchmark cut-off wheels quite a bit lately. The grinder is a Bosch 1375A. It does quite well, but I was concerned about the heat build up in the gear housing. I have since cleaned out the gear housing and applied Super Lube grease #21030. The grinder seems to be doing better, although still not running ice cold. Thank You for your reply.

even with the propper stuff and amount it will still get fairly warm

 

[Richiew]

I've had a look at a Bosch grinder manual. It doesn't mention duty cycle at all, but does acknowledge that the tool will get hot if you run it hard.

Appears to be a feature rather than a fault.

 

[Barking Mat]

I've had a cheap one smoke, then catch fire, I hurled it into the garden.

 

[leadpig]

as said buy decent grinders and decent consumables, i am a huge fan of metabo at the minute with the dewalt extreme diamond metal cut off blades and 3m cubiton2 fibre discs.
cutting 12mmx200mm i beams above head with a 125mm grinder as thats all i could get in for two days, grinders got rather warm but not hot and i was really pushing on them,
beveling 6mm plate was to much for the makitas ive used before and changing discs every few minutes is a ball ache

 

[Barking Mat]

as said buy decent grinders and decent consumables, i am a huge fan of metabo at the minute with the dewalt extreme diamond metal cut off blades and 3m cubiton2 fibre discs.
cutting 12mmx200mm i beams above head with a 125mm grinder as thats all i could get in for two days, grinders got rather warm but not hot and i was really pushing on them,
beveling 6mm plate was to much for the makitas ive used before and changing discs every few minutes is a ball ache

Metabo is my favourite grinder, Makita are cheaper, but do the job.

 

[brightspark]

i have many makes of angle grinders but the best is a dewalt one bought second hand for 25 quid .its got a powerfull motor and nice to use

 

[Erie Fred]

Is it normal for a grinder to get so hot that you can't touch the metal gear housing? Talking about a right angle grinder.

Is this the one you equippped with the "Most agressive possible" wheels ?

 

[Merkava_4]

Is this the one you equippped with the "Most agressive possible" wheels ?

Yes I was trying to equip it with the most aggressive wheel. That was until I found out that it's faster to cut the weld out with two intersecting slices using a cut-off wheel.

 

[Pigeon_Droppings2]

I use a dewalt battery grinder...to be honest I've never really noticed it heating up. I use it with the 6ah batteries....but I'm mainly using the knot wheels which maybe is less intense for the machine.

....the 6ah battery turned out not to be great value....turns out a 4ah would probably have outlasted me!