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Grinding disc with depressed center? MiamiCuse 03-23-2008
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Posted by MiamiCuse on March 23, 2008, 11:24 pm
I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much
grinding to do so I just wanted to get a cheap one and use it for this
project which requires grinding off a few door hinges that has been set into
metal door jambs that extended into the slab. The grinder came with metal
disc but I also need to make some cuts in concrete so I went and got a
4-1/2" diamond blade from the big box store only to find that those discs do
not fit...apparently the metal grinding disc that came with it has a
depressed center so that the locking nut can be secured from the outside.
If I put in a flat disc there is not enough room for the lock to catch -
well even if there was I am not sure it's a good idea as the lock may break
the thin disc.

I have never used this type of grinder before does it mean I need a special
depressed center diamond cutting blade or do I need a special fitting to use
standard blades?

Thanks,

MC



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Posted by Roger Shoaf on March 24, 2008, 12:08 am
Go back to HF, I think I recall seeing cheap diamond blades for that
grinder.


--
Roger Shoaf
If you are not part of the solution, you are not dissolved in the solvent.


> I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much
> grinding to do so I just wanted to get a cheap one and use it for this
> project which requires grinding off a few door hinges that has been set
into
> metal door jambs that extended into the slab. The grinder came with metal
> disc but I also need to make some cuts in concrete so I went and got a
> 4-1/2" diamond blade from the big box store only to find that those discs
do
> not fit...apparently the metal grinding disc that came with it has a
> depressed center so that the locking nut can be secured from the outside.
> If I put in a flat disc there is not enough room for the lock to catch -
> well even if there was I am not sure it's a good idea as the lock may
break
> the thin disc.
>
> I have never used this type of grinder before does it mean I need a
special
> depressed center diamond cutting blade or do I need a special fitting to
use
> standard blades?
>
> Thanks,
>
> MC
>
>



Posted by on March 24, 2008, 4:42 am
On Sun, 23 Mar 2008 23:24:17 -0400, "MiamiCuse"

>I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much
>grinding to do so I just wanted to get a cheap one and use it for this
>project which requires grinding off a few door hinges that has been set into
>metal door jambs that extended into the slab. The grinder came with metal
>disc but I also need to make some cuts in concrete so I went and got a
>4-1/2" diamond blade from the big box store only to find that those discs do
>not fit...apparently the metal grinding disc that came with it has a
>depressed center so that the locking nut can be secured from the outside.
>If I put in a flat disc there is not enough room for the lock to catch -
>well even if there was I am not sure it's a good idea as the lock may break
>the thin disc.
>
>I have never used this type of grinder before does it mean I need a special
>depressed center diamond cutting blade or do I need a special fitting to use
>standard blades?
>
>Thanks,
>
>MC
>

If you bought it at Harbor Freight (Harbor Fright), I'd toss it in the
garbage before it kills you or causes a serious injury. Even if it
does work and you are lucky enough not to get hurt, it will burn up
after a few hours of use. Harbor Freight only sells one thing....
GARBAGE.


Posted by hallerb@aol.com on March 24, 2008, 7:43 am
On Mar 24, 3:42=EF=BF=BDam, crayolahun...@deleted.com wrote:
> On Sun, 23 Mar 2008 23:24:17 -0400, "MiamiCuse"
>
>
>
>
>
> >I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much
> >grinding to do so I just wanted to get a cheap one and use it for this
> >project which requires grinding off a few door hinges that has been set i=
nto
> >metal door jambs that extended into the slab. =EF=BF=BDThe grinder came w=
ith metal
> >disc but I also need to make some cuts in concrete so I went and got a
> >4-1/2" diamond blade from the big box store only to find that those discs=
do
> >not fit...apparently the metal grinding disc that came with it has a
> >depressed center so that the locking nut can be secured from the outside.=

> >If I put in a flat disc there is not enough room for the lock to catch -
> >well even if there was I am not sure it's a good idea as the lock may bre=
ak
> >the thin disc.
>
> >I have never used this type of grinder before does it mean I need a speci=
al
> >depressed center diamond cutting blade or do I need a special fitting to =
use
> >standard blades?
>
> >Thanks,
>
> >MC
>
> If you bought it at Harbor Freight (Harbor Fright), I'd toss it in the
> garbage before it kills you or causes a serious injury. =EF=BF=BDEven if i=
t
> does work and you are lucky enough not to get hurt, it will burn up
> after a few hours of use. =EF=BF=BDHarbor Freight only sells one thing....=

> GARBAGE.- Hide quoted text -
>
> - Show quoted text -

ahh HF tools are fine for occasional use, when you dont need it enough
to buy a dewalt or other expensive unit

Posted by Pete C. on March 24, 2008, 8:47 am

crayolahunter@deleted.com wrote:
>
> On Sun, 23 Mar 2008 23:24:17 -0400, "MiamiCuse"
>
> >I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much
> >grinding to do so I just wanted to get a cheap one and use it for this
> >project which requires grinding off a few door hinges that has been set into
> >metal door jambs that extended into the slab. The grinder came with metal
> >disc but I also need to make some cuts in concrete so I went and got a
> >4-1/2" diamond blade from the big box store only to find that those discs do
> >not fit...apparently the metal grinding disc that came with it has a
> >depressed center so that the locking nut can be secured from the outside.
> >If I put in a flat disc there is not enough room for the lock to catch -
> >well even if there was I am not sure it's a good idea as the lock may break
> >the thin disc.
> >
> >I have never used this type of grinder before does it mean I need a special
> >depressed center diamond cutting blade or do I need a special fitting to use
> >standard blades?
> >
> >Thanks,
> >
> >MC
> >
>
> If you bought it at Harbor Freight (Harbor Fright), I'd toss it in the
> garbage before it kills you or causes a serious injury. Even if it
> does work and you are lucky enough not to get hurt, it will burn up
> after a few hours of use. Harbor Freight only sells one thing....
> GARBAGE.

Wrong, and anyone who believes that is missing out on some very good
deals. HF certainly does carry some stuff that is indeed garbage, but
there are a number of gems in their lineup as well. Having a HF store
nearby where you can inspect the items in person is a big help in
finding those gems. It's been reported by many knowledgeable folks that
the HF orange 4.5" AG lasts many years under frequent use. The blue line
has mediocre reviews. As for the disk issues, try reviewing the manual
for info and if you can't find good info there try looking at the
manuals online for the brand name angle grinders that might have better
instructions.

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