7 and 9 inch angle grinders ??

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Hey guys, rooky welder here. I have 4 1/2" angle grinder, but i was looking through the Northern Tool catalog and a saw a 7' and a 9" angle gringer ..... What in the world would you use a 9" angle grinder for ?
Reply:Sorry, I just realized I put that question in the wrong forum. This is the forum I automaticly go to when I come to this sight. But I would be greatful for yalls help.
Reply:go to toolbarn.com for good tools i have a 9" grinder it just works so much faster than a 4.5 grinder Attached Images
Reply:A  9" grinder was all I used the first 25 years I welded, never saw a 4 1/2" before that, or a 7" for that matter. They were made of metal too, not plastic. Use one 12 hrs. a day (as a helper) and your arms vibrated for the other 12 hrs. And we used them for everything you use a 4 1/2" grinder for. They still will do the job faster, but they still make the arms vibrate, shudder and shake!Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.                                         -Cree Indian ProverbSA 200 LincolnVictor Torches
Reply:I have several old Black & Decker 9" grinders and I can tell you there is nothing like'em for removing metal. You had better be holding on when you pull that trigger. Their awesome.
Reply:Have an old 9" that doesn't get out of the box much anymore...it's damn near as old as I am...originally bought it when i was in the structural/architectural concrete biz.  Removes a boat load of material (metal or concrete) in a hurry, but at the end of the day you're ready to drink your beer through a straw
Reply:I love my makita 5" grinders with a 6" disk and larger guard.for the heavy work I bust out a 7" , but I don't carry one in my truck.
Reply:bigger work == bigger and more powerful grinder.  I have a nice 7" Makita which I bought because I needed to cut through some concrete with it using a diamond blade.  Since then it's been used for quite a bit of other stuff...basically, whenever the 4.5 is too small or weak.  Every size of tool has a purpose.  I don't use my 4.5" where I need to get inside something, that's what my straight or 90* 1/4" die grinders are for.  I don't use the die grinders to clean off a 3' section of tubing, that's what my 4.5" is for.  I wouldn't use the 4.5" to clean off a 4'x4' section of plate...that's what something bigger is for --Wintermute"No man's knowledge here can go beyond his experience." - John Lockewww.improvised-engineering.comManufacturer Agnostic:Blood----------Sweat---------Tears----|------------------|----------------|----Lincoln Red, Miller Blue, Esab Yellow
Reply:Originally Posted by wintermutebigger work == bigger and more powerful grinder.  I have a nice 7" Makita which I bought because I needed to cut through some concrete with it using a diamond blade.  Since then it's been used for quite a bit of other stuff...basically, whenever the 4.5 is too small or weak.  Every size of tool has a purpose.  I don't use my 4.5" where I need to get inside something, that's what my straight or 90* 1/4" die grinders are for.  I don't use the die grinders to clean off a 3' section of tubing, that's what my 4.5" is for.  I wouldn't use the 4.5" to clean off a 4'x4' section of plate...that's what something bigger is for --Wintermute
Reply:First grinder I ever bought was a 7" milwaukee, I still have one around for when I have some real serious amount of metal I need to grind off, or need a big cup brush to remove paint or rust.  Usually gets used about once a year now, less if I can avoid it.  When I started every body shop had a 7" electric disk sander for bodywork, (same as a 7" grinder but with a rubber pad and a phenolic sanding disc, usually 36 grit)Can't imagine why we say "those were the good old days"."The reason we are here is that we are not all there"SA 200Idealarc TM 300 300MM 200MM 25130a SpoolgunPrecision Tig 375Invertec V350 ProSC-32 CS 12 Wire FeederOxweld/Purox O/AArcAirHypertherm Powermax 85LN25
Reply:Originally Posted by ed macgo to toolbarn.com for good tools i have a 9" grinder it just works so much faster than a 4.5 grinder
Reply:I've had a 9" milwaukee for the last 25 years.Big and heavy.You can lean on it and it barely slows down. The smaller (4.5) ones are nice and light but don't remove material as fast.Most people prefer the smaller ones now,and I can see why.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Hey Ed mac, do those grinders have the twistlock cords?  I use Milwaukees too, but mine all have hard cords.  I feel like I've been jipped now..kickass grinders thoughBuy American, or don't whine when you end up on the bread line.
Reply:Nothing like a 9" grinder for excavator buckets, wing plows, dump bodies, big bore pipe, ....... you want me to keep going.Disclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:Do they make cut off wheels for the 9" grinders?
Reply:Originally Posted by dumb as a stumpHay there's no guard on that Milwaukee you don't use it that way do you???
Reply:A tiger paw works just fine with a guard in place and will take a very serious amount of skin or metal off quite quickly.  It just doesn't care!  If the guard is off for a tiger paw they seem to be left off when a rock is put on as well as a wire wheel or wafer wheel.  ALL of which are detrimental to the well being of your digits."The man of great wealth owes a peculiar obligation to the State, because he derives special advantages from the mere existence of government."  Teddy RooseveltAmerican by birth, Union by choice!  Boilermakers # 60America is a Union.
Reply:What does everyone recomend for a new 9" grinder.  I would like one to use for both grinding metal and for cutting concrete pavers.  Thanks
Reply:I used a 9" Black and Decker for years before I got a few of the 4-1/2" grinders.  The 9" B&D will remove a lot of steel quickly. But hang on when you turn it on, the torque will dang near pull it out of your hands if your not carefull.
Reply:Originally Posted by deriklWhat does everyone recomend for a new 9" grinder.  I would like one to use for both grinding metal and for cutting concrete pavers.  Thanks
Reply:I have five 4-1/2" grinders -- it sure beats having to spend too much time changing from abrasive wheel to grinding wheel to flap wheel to metal brush.  I recently asked a question about 7"/9" grinders on another board.  The consensus was that it doesn't make a lot of sense to get a 7" one, since you can always used smaller disks on a 9" model.  The larger grinders are more powerful (in terms of removing material) but harder to handle with much finesse or to maneuver in tight spaces.I ended up deciding to stay with my 4-1/2" grinders for now.Jack OlsenMy garage website
Reply:Originally Posted by deriklWhat does everyone recomend for a new 9" grinder.  I would like one to use for both grinding metal and for cutting concrete pavers.  Thanks
Reply:There's nothing wrong with using an angle grinder to cut pavers...again, every tool has it's use.  If you're cutting 4'x4' pavers, then by all means, use a demo saw.  I'd be hiding behind the nearest solid object if I saw someone trying to cut a 12"x12" paver with a demo saw though.As to the question asked though, I would say that any of the good name brand grinders will do you well.  Variable speed is always a bonus if it's available.  I personally like my Makita 7" but it's what I have and what I've been using and it works well for me.Plan to spend good money on blades though.  Don't buy something cheap when you're going to be running it on a machine with that much torque --Wintermute"No man's knowledge here can go beyond his experience." - John Lockewww.improvised-engineering.comManufacturer Agnostic:Blood----------Sweat---------Tears----|------------------|----------------|----Lincoln Red, Miller Blue, Esab Yellow
Reply:Here's my 9" beast,still the same wheel it come with,it's a craftsman 10 amp 9" grinder and probably weighs 20 lbs I agree with someone else,you'd better be hold'n on when you pull the trigger on this beast.Not much count for overhead work unless your built like Mr. UniverseI thought it was 10 amp but cleaned the nameplate off and it says it is 15 amp. Attached ImagesLast edited by dugndeep; 01-06-2011 at 06:39 PM.Maxus Pro-125 MigChicago Electric 90 amp DC flux-coreLincoln Electric AC 225 tombstoneO/A torchM/O mini-torch10 acres of flatland15 acres of holler
Reply:Why would you hide?  I and other co-workers often cut 8"X12" bluestone and sometimes bigger on the job.  Not scary to do at all.I don't doubt you Larry...but I've seen what happens when a gas powered demo saw bites something and throws it.  You may have done it a million times, but I'd still be out of the path of trajectory of where that chunk of stoone may go if something catches   It's not the bigger ones I'd be worried about, its the smaller ones that can just get picked up by the blade and thrown.--Wintermute"No man's knowledge here can go beyond his experience." - John Lockewww.improvised-engineering.comManufacturer Agnostic:Blood----------Sweat---------Tears----|------------------|----------------|----Lincoln Red, Miller Blue, Esab Yellow
Reply:Yer right, those smaller ones can be a doozy.  I must admit on a few occasions trying to cut small bits of steel and stone with my left foot holding it down, they have caught and thrown.Admittedly, all tools, power or not, need a certain level of respect to use.