7 in grinder

Hi all - I picked up a Hitachi 7 in grinder 15 amps I had high hopes But i am surprised how weak it is , even the 41/2 Hitachi cuts better
What kinda amps does a 7 in grinder need to do Justice . any way this thing is heavy cuts weak so to me it is dangerous

are you certain your circuit is packing 15 amps ? maybe a bad grinder ?

Originally Posted by Bear

are you certain your circuit is packing 15 amps ? maybe a bad grinder ?

might be correct as this line seems to blow if i over load it

try using it on a solid circuit and see what happens. You'll want to know any extension cords are a good and solid 15 amp too. 15 amps would max out most ordinary house circuits, so if your circuit is only 15, it needs to be a good solid route all the way through for any 15 amp tools/appliances

Originally Posted by Mechanic688

Change out your breaker for a 20 amp, your probably not getting the "true" amperage the grinder needs to work correctly.

can you tell him what size wiring needs to be Mech? I can't recall but i know they're a bit different for 15 and 20 amp

20 amp circuits need 12 gauge wire.

I've done some rewiring before, but only when i had to. Don't really like messing with it, but it's nice to know you've got a good circuit there when you're done. I had a bit of help learning from commercial electricians, google, etc. but i don't recommend it for anyone who doesn't have a clue

Wow lots of electrical engineers on here for this being a scrap forum. Sorry just had to say it. Can we also remember who asked the original question do you really want him do any type of rewiring or any electrical work at all?

Originally Posted by PistoneScrapProcessing

Wow lots of electrical engineers on here for this being a scrap forum. Sorry just had to say it. Can we also remember who asked the original question do you really want him do any type of rewiring or any electrical work at all?

my first thought was he should ensure he had a circuit that was capable of giving a solid 15 amps from the main box to the grinder, not to rewire his house lol

For me I will have to use a outlet box with more juse like the washer but I'll have to use a long extension cord so even if the cord i have is heavy duty wont i loose juice from a long cord

Originally Posted by Copper Head

For me I will have to use a outlet box with more juse like the washer but I'll have to use a long extension cord so even if the cord i have is heavy duty wont i loose juice from a long cord

You will lose voltage. There is a direct relationship between length of extension cord and voltage drop. A 12-gauge extension cord on a 20-amp circuit will lose 7.7 volts every 100 feet. You don't have to go too far before you won't have enough juice left to run much of anything - regardless of the amperage you start with.

Mine is 6 amps and cuts okay. It bogs down if I push it too hard. Are you grinding or cutting? Either way 15 amps seems plenty and I have to wonder if your grinder is a dud.

cutting and it bogs , my 6 amp does not bog i think it must be the power source .As the lower power tool works fine