MegaSack DRAW - This year's winner is user - rgwb
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I've got my little bench power hacksaw working away on a 2" aluiminium bar, and the motor is getting quite warm - at what point should I turn it off and let it cool, do you think?
It's currently about half way through, and it's about 49 degrees C 😉
Is there no rating on the motor plate
usually 40 degrees C ambient air + the rating for A class insulated motors this could be 55-60 degrees so it will run at 100 degrees till it quits
dont take my word for it though and remember when it catches fire don't pour water on it
I'd happily go until it's too hot to touch, i.e more like 60-70 C, unless you'll be using like that all the time in which case installing some cooling would be smart.
49 degrees C
Well the electric motors I use don't like being above 50 degrees...
In theory fine till 60 but in practice 50 is what we work to....
Convince it to do the Ice Bucket Challenge?
It seems to have stabilised at around 47 degrees now.
Is there no rating on the motor plate
It's a 50-year-old Hoover motor - no useful info on the plate 😀
Unplug it first then you can throw water on it 🙂
Are you using any coolant on the blade itself? Or just cutting dry? Sorry if that's a stupid question but ally does clag up blades pretty quickly
I used a lot of oil - got there eventually 😉
very hot motor lots of oil, seems like a high fire risk, eventyually the insulation will melt or smoke on the motor, when i worked in industry quite common.
There should be a spec sheet for the motor somwhere, this should detail the min/max operating temperatures.
example
For ally you are better off with a bit of soluble cutting oil in water just lash it on from a squeezy bottle. Does better job of keeping your blade clear. Or get an apprentice 😉 they do lots of hacksawing in our place
I used GT85 in a squeeze bottle - worked well.
PTFE particles + solvent + hot blade = not good for you.
Can you rig up a fan to blow over the motor? 50 deg should be fine and you will normally smell dust getting warm and then the coating on the windings getting hot is you are getting close to it's limit.
Back door was open for a through breeze - no burning smells 😉
Fnarr Fnarr.
Back door was open for a through breeze - no burning smells
Been on the haggis? Don't light a match.
oh you meant the workshop door...
edit: dammit. I got distracted.