Electric vs. Air grinder... - Ford Bronco Forum
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post #1 of 40 (permalink) Old 02-07-2006, 03:54 PM Thread Starter
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Electric vs. Air grinder...

I need to cut my bumper up for tow hooks and clearance. I also need a grinder and since I dont have my air tools yet I think I am going to go with an electric model, I saw a Dewalt for sale at home depot.

But before I do I thought I would ask here if anyone has experience/preferences with electric grinders/cutters.

Any advise appreciated,
NJB
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post #2 of 40 (permalink) Old 02-07-2006, 03:56 PM
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well its cheaper to go with electric...also you will have constant rpms...where as if you go with air depending on compressor size you may have to wait for air build up...just make sure you get cutting wheels for the electric one.

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post #3 of 40 (permalink) Old 02-07-2006, 04:08 PM
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buy a milwakee (sp?) 4.5 grinder.

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post #4 of 40 (permalink) Old 02-07-2006, 04:17 PM
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i think for what you are doing, you can go get a cheapie from harbor freight. i have a 4.5" angle grinder and it has done way more work than i thought it could. it cost $14
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post #5 of 40 (permalink) Old 02-07-2006, 04:40 PM
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I use a dewlt DW402 4.5" grinder. It's one of the tools I use the most. I can't seem to kill it. It has the paddle trigger on the bottom instead of the slide switch on the side.

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post #6 of 40 (permalink) Old 02-07-2006, 09:10 PM
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I like my craftsman 4.5" its pretty nice and decently cheap.

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post #7 of 40 (permalink) Old 02-08-2006, 12:30 AM
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electric vs air

Quote:
Originally Posted by beisel1111
I use a dewlt DW402 4.5" grinder. It's one of the tools I use the most. I can't seem to kill it. It has the paddle trigger on the bottom instead of the slide switch on the side.
I have two electric 4.5"ers, one has slide switch and other one has the paddle trigger . On the electric ones I agree, paddle trigger better in my opion. You can run the hell out of the electric ones.
(Air) Depending on how much grinding you are doing, you may be cycling your compressor alot.
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post #8 of 40 (permalink) Old 02-08-2006, 05:32 PM
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I do a lot with both air and electric, and I'd definitely go electric. Air grinders use a LOT of air, and you'll have to have one hell of a compressor if you want to be able to run it continuous duty (your usual 25gal oilless like my little one is NOT going to do the job for long). Now if you have something with a 5HP continuous duty motor and an oil sumped pump, you're good to go.

I've got a $20 Black and Decker 4.5 we picked up on clearance, and it has no objections to me running it for 1-2 hours continuous like we did cleaning up and grinding the endplates for my rear bumper.

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post #9 of 40 (permalink) Old 02-08-2006, 06:48 PM
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Well Electric Has a lot more power. If your friends are watching they will be amazed at the sparks.


With air you won't acomplish as much. Your friends will chuckle as your instrument gasps on it's last breath of air.



Oh you said grinder. Same thing. The little 4.5 HF onces work great.

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post #10 of 40 (permalink) Old 02-08-2006, 07:37 PM
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Air grinders rule, if you have a big enough compressor. I have a 7 horse compressor and it is not big enough to supply the air needed to run my air grinder. Just by the electric

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post #11 of 40 (permalink) Old 02-10-2006, 04:41 PM
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Quote:
Originally Posted by waltman
Air grinders rule, if you have a big enough compressor. I have a 7 horse compressor and it is not big enough to supply the air needed to run my air grinder. Just by the electric
More specs on your compressor please. Manufacturer, tank size, etc.

I've been considering a pneumatic grinder. The biggest drawback I can think of is that I've never seen any that are surrounded in composite. I mean even my die grinders get cold enough after prolonged use that I need something more than Mechanix gloves; once I even switched to my welding gloves and the cold still came thru them after awhile.

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post #12 of 40 (permalink) Old 02-11-2006, 01:34 AM
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Quote:
Originally Posted by Chuck
I do a lot with both air and electric, and I'd definitely go electric. Air grinders use a LOT of air, and you'll have to have one hell of a compressor if you want to be able to run it continuous duty (your usual 25gal oilless like my little one is NOT going to do the job for long). Now if you have something with a 5HP continuous duty motor and an oil sumped pump, you're good to go.

I've got a $20 Black and Decker 4.5 we picked up on clearance, and it has no objections to me running it for 1-2 hours continuous like we did cleaning up and grinding the endplates for my rear bumper.
Agreed, die grinders use a lot of air. My IR 2-stage cont. duty compressor keeps up, but only just barely, and I have a 64 gallon tank. But...it cuts WAY better than my angle grinder, and the compressor DOES keep up. I use my die grinder a lot, and have never had to wait for the compressor to catch up.

My angle grinder is just some off-brand thing I picked up at a garage sale for $5 about 3 years ago. One time I overheated it and it started smoking and sparking and then seized. When it cooled down it started back up just fine and has worked well ever since. Go figure.....

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post #13 of 40 (permalink) Old 02-11-2006, 02:01 AM
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Quote:
Originally Posted by TTBlows
More specs on your compressor please. Manufacturer, tank size, etc.

I've been considering a pneumatic grinder. The biggest drawback I can think of is that I've never seen any that are surrounded in composite. I mean even my die grinders get cold enough after prolonged use that I need something more than Mechanix gloves; once I even switched to my welding gloves and the cold still came thru them after awhile.
I don't know the specs off hand...it's a coleman stand up model running on 220 volts. It is great for all my other air tools, die grinder, orbital sander, air hammer, air drill, spray gun. It keeps up with all that stuff, but my air grinder which takes the 7" grinding stone eats too much air for me to use it continuosly.

You can't get away from the cold, it's something you have to learn to deal with.

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post #14 of 40 (permalink) Old 02-12-2006, 07:14 PM
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I bought an electric from Menards, for 20 bucks, seems to run great, and it has a better warranty than bosch did. Its a "tool shop 4"" or 4.5

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post #15 of 40 (permalink) Old 02-12-2006, 08:59 PM
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Harbor freight has it's good and bad products. I bought a HR 4 inch grinder years ago and have used the crap out of it and it works awesome
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post #16 of 40 (permalink) Old 02-16-2006, 01:15 AM
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I got a craftsman 4" that works great, I just wish Id spent 10 more dollars and got the 4.5".

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post #17 of 40 (permalink) Old 02-16-2006, 06:37 PM
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I like air, more RPM, but I have the compressor from hell. CFM is not a problem. I think electric grinders will take more abuse and if I'm grinding heavy metal or grinding for hours on end I use my Makita 4.5" or IR 7" electric. For every thing else it's air.

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post #18 of 40 (permalink) Old 02-16-2006, 09:29 PM
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Quote:
Originally Posted by XLTChris
Harbor freight has it's good and bad products. I bought a HR 4 inch grinder years ago and have used the crap out of it and it works awesome
I'm not a fan of the HF 4" grinder. I picked one up on sale for $9, so I definitely can't bitch about the price, it was just too good a deal to pass up even though I already had a Craftsman 4". If I was completely deaf I would probably not have an issue with the HF because it actually grinds well enough. The problem is that it sounds like the gears in it are eating themselves whenever it's running. Like I said, no real performance issues, but it just worries me because the Craftsman is so much quieter. I ended up leaving a sanding flap on it so I don't have to change disks on the Craftsman, works well for that.
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post #19 of 40 (permalink) Old 02-17-2006, 12:27 AM Thread Starter
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I wound up grabbing a dewalt 4" from home depot on sale for like $20. Works very well.

Thanks for the advise..
NJB
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post #20 of 40 (permalink) Old 02-17-2006, 10:00 PM
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Quote:
Originally Posted by TTBlows
More specs on your compressor please. Manufacturer, tank size, etc.

I've been considering a pneumatic grinder. The biggest drawback I can think of is that I've never seen any that are surrounded in composite. I mean even my die grinders get cold enough after prolonged use that I need something more than Mechanix gloves; once I even switched to my welding gloves and the cold still came thru them after awhile.
mac just came out with a new one with pivit head that had composite surround. was major bucks though.

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