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#4665285 - 02/13/18 09:26 PM can you put a 7'' cutoff wheel on a 4.5'' grinder?
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
I'm cutting some bolts off with my 4.5in handheld dewalt grinder and I'm having trouble cutting all the way through because I keep hitting either the guard or the center washer that holds the wheel on. I don't see any reason why it wouldn't work, just have to take the guard off and make sure my fingers don't get close.
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4665295 - 02/13/18 09:36 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
The diameter of the wheel will greatly rob the grinder of the torque needed to perform, but if the center diameter of the wheel/arbor is the same, give it a try.


Edited by KneeGrinder (02/13/18 09:41 PM)
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#4665296 - 02/13/18 09:39 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
AVB Offline


Registered: 05/20/12
Posts: 1281
Loc: Georgia
Most will have a different size hole, but it isn't a good idea if they did fit. It kind of sounds like you are using a worn out disk. How big are the bolts you are trying to cut?

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#4665299 - 02/13/18 09:41 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
tig1 Offline


Registered: 01/03/09
Posts: 13657
Loc: Illinois
I wouldn't do it. RPM for the 4.5 is higher than the 7 in grinder. The 7 in disc may not be designed for the higher RPM. There's about 3000 RPM difference between my 4.5 vs the 7 in.


Edited by tig1 (02/13/18 09:42 PM)
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#4665301 - 02/13/18 09:41 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2734
Loc: Wet side WA
Taking the guard off is a bad idea its there for a reason!
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Out: QSUD 5W-30 Purolator One 5030
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Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4665304 - 02/13/18 09:46 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: tig1]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
Originally Posted By: tig1
I wouldn't do it. RPM for the 4.5 is higher than the 7 in grinder. The 7 in disc may not be designed for the higher RPM. There's about 3000 RPM difference between my 4.5 vs the 7 in.


Once he puts that 7 inch disc on anything, it won't be spining very fast at all.

lol, I must be dangerous, only my chop saw and miter saw have guards!


Edited by KneeGrinder (02/13/18 09:48 PM)
_________________________
08 Tribeca 82k PUP 5w30 wix
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00 F350 133k Delvac 1300 15w40 wix

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#4665311 - 02/13/18 09:50 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
I feel like it's more dangerous with the guard getting in the way making me go crooked with the wheel. I'd rather have a larger wheel on it so I can cut straight.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4665314 - 02/13/18 09:51 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
I do believe a 7" disc is going to naturally spin slower because it has to travel farther to make one rotation compared to the smaller wheel.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4665326 - 02/13/18 10:06 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
AZjeff Offline


Registered: 01/14/11
Posts: 2630
Loc: PV Az
Originally Posted By: motor_oil_madman
I do believe a 7" disc is going to naturally spin slower because it has to travel farther to make one rotation compared to the smaller wheel.


You would believe wrong. If your grinder spins @ 10,000 rpm it spins at 10,000 rpm. It may take longer to spin up with a bigger wheel but not much. A 4.5" wheel has a diameter of 13", a 7" wheel is 22" diameter. You get 70% more cutting surface per revolution and it's traveling 70% faster but it's going to bog down, think of being in 5th gear when you should be in 2nd.

If you do this make sure the disc isn't overlapping the grip area.
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#4665355 - 02/13/18 10:57 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
WANG Offline


Registered: 01/08/08
Posts: 545
Loc: North Carolina
It will work.
The hazards presented by such a configuration are generally self-correcting. I've done it plenty. Prefer not to.
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Problem is, the average sportbike buyer is more lumberjack than surgeon." -Richard Pollock

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#4665356 - 02/13/18 10:58 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
Shannow Offline


Registered: 12/12/02
Posts: 39846
Loc: 'Stralia
Yes, they even make "spacers" to help do it.

Take off the guard, apply big disk, and off you go.

How attached are you to your fingers ?

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#4665362 - 02/13/18 11:09 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
irekm Offline


Registered: 05/07/13
Posts: 19
Loc: vancouver
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#4665363 - 02/13/18 11:10 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: tig1]
LvR Offline


Registered: 09/19/09
Posts: 24
Loc: SA
Originally Posted By: tig1
I wouldn't do it. RPM for the 4.5 is higher than the 7 in grinder. The 7 in disc may not be designed for the higher RPM. There's about 3000 RPM difference between my 4.5 vs the 7 in.
This

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#4665366 - 02/13/18 11:26 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: motor_oil_madman]
dareo Offline


Registered: 10/17/07
Posts: 1448
Loc: utah
Great excuse to buy another tool and not get injured.
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2016 Golf Wagon 5MT, 2014 Accord Sport 6MT, 2005 GMC 2500 SLT 6.0 2WD, T100 Sold

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#4665377 - 02/13/18 11:57 PM Re: can you put a 7'' cutoff wheel on a 4.5'' grinder? [Re: dareo]
LvR Offline


Registered: 09/19/09
Posts: 24
Loc: SA
Originally Posted By: dareo
Great excuse to buy another tool and not get injured.
..........or die. That 7" disk has a lot of mass and I have seen one exploding as a result of overspeed only taking a guys hand off.

For effect see https://www.youtube.com/watch?v=eJOiKuVeXA0

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