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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
I'd go for a dewalt, got a chop saw and 4.5" both work great
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 itQuote:
Originally Posted by Bear
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
Change out your breaker for a 20 amp, your probably not getting the "true" amperage the grinder needs to work correctly.Quote:
Originally Posted by Copper Head
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 ampQuote:
Originally Posted by Mechanic688
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
Changing the circuit breaker won't do a thing. It doesn't control the amperage, the device does. But like someone mentioned, and this is important, if you change the breaker from a 15 amp to a 20 amp, you will also have to make sure you have 20 AWG wire from the breaker to the receptacle. Failure to do that can cause a fire.
20?? Did you mean 12 gauge??Quote:
Originally Posted by billygoat
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 lolQuote:
Originally Posted by PistoneScrapProcessing
Some of us have poked our head out of the yard ever now and again and ahh no on that last question...Playing with acid and sparks not for everyone.Quote:
Originally Posted by PistoneScrapProcessing
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.Quote:
Originally Posted by Copper Head
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
Yes. Should have been paying attention to what I was typing. Sorry.Quote:
Originally Posted by KZBell
I don't know about the others, but I was formerly employed as a union electrician. Went through the whole apprenticeship including four years of night school. (Nothing against anyone who is anti-union, but the unions have much better training.)Quote:
Originally Posted by PistoneScrapProcessing
Is the grinder getting up to full speed?
It should 'ring out' when it gets up to full speed & then I start cutting.
I plug my extension cords into the electric stove when I'm not sure about the power supply, I figure its got the best power cable going to it.
the breaker is 15 amp and i used a 25 foot coard so thats the problem
was the cord too small ? shouldn't a 15 amp circuit power a 15 amp tool, long as the wiring is all good ?
Actually, the biggest load you are supposed to put on a 15 amp breaker is 12 amps. You are allowed to run up to 80% of the circuit breaker capacity. So a device drawing a full 15 amps should trip a 15 amp breaker. It might just be that it can take up to 15 amps to get the device started and then once it gets up to full speed it draws less. Some breakers are designed for that. Or sometimes the breaker can get faulty.