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Posted by Steve B on September 16, 2006, 12:18 am
> Great suggestion; isn't the internet incredible!
> It says my idea is correct, but also says to use a guard that covers the
> bottom of the disk.
> As long as I have the bottom pointed away from me, that shouldn't be
> critical, should it?
I recently put the guards back on my grinders. I have four. I bought a
Makita die grinder for a cut off tool that has a thin blade. Before that, I
used a thin flat blade in a 4.5" grinder. I like the die grinder much more
because it has a flat mandrel, and both of my hands are farther away from
the cutting point.
I have been welding now for 31 years. I would put an angle grinder in the
top three tools I consider to be the MOST dangerous. When they bind or jump
or shatter, it's over within 1/1000th of a second. At 14,000 rpm, that's
fourteen revolutions.
The point on the rotating device (cutting wheel, grinding disc, sander, wire
brush, flapper, whatever) at which you contact the work is critical. As
with a chainsaw, when it touches the wrong part of the rotating portion, it
can kick. Learn where that is, and give this little chainsaw all the
respect it deserves.
YMMV
Steve
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Posted by Chris Lewis on September 18, 2006, 12:33 pm
> I have been welding now for 31 years. I would put an angle grinder in the
> top three tools I consider to be the MOST dangerous. When they bind or jump
> or shatter, it's over within 1/1000th of a second. At 14,000 rpm, that's
> fourteen revolutions.
Excellent post, except for one small point: 14,000 RPM is revolutions
per _minute_. 1/1000th of a second is .233 revolutions ;-)
A more useful perspective is that of tip speed. 233 revolutions
per second has the rim going at approximately 230 feet per second.
(pi * D * 233 / 12)
If your eyeball is 2' away, you get blinded in 1/100th of a second.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.
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Posted by Jim Yanik on September 18, 2006, 8:17 pm
clewis@nortelnetworks.com (Chris Lewis) wrote in
>> I have been welding now for 31 years. I would put an angle grinder
>> in the top three tools I consider to be the MOST dangerous. When
>> they bind or jump or shatter, it's over within 1/1000th of a second.
>> At 14,000 rpm, that's fourteen revolutions.
>
> Excellent post, except for one small point: 14,000 RPM is revolutions
> per _minute_. 1/1000th of a second is .233 revolutions ;-)
>
> A more useful perspective is that of tip speed. 233 revolutions
> per second has the rim going at approximately 230 feet per second.
>
> (pi * D * 233 / 12)
>
> If your eyeball is 2' away, you get blinded in 1/100th of a second.
Well,you should be wearing,at minimum,eye protection anyways.
Better,a face shield.
Only a dumbass would grind/cut with no eye protection.
--
Jim Yanik
jyanik
at
kua.net
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Posted by glenn P on September 15, 2006, 7:36 pm
The flanged side is to center the wheel, and should face the disk. You will
notice there's a lot of clearance between the shaft & the disk - the job of
the flange is to get it centred before it's tightened.
>I have never used anything but grinding (what, blades, inserts, disks?) in
>my Makita 4.5" angle grinder, but today I need a cutting disk. It is
>much thinner, so it just spins. The retaining nut is flat on one side and
>flanged on the other. If I turn it around so the flat side is down, rather
>than the flanged side down, it seems to work okay.
> But I don't have the instructions, so I don't know if this is actually
> proper.
> Any catastrophe happen if I use it like this? If so, how do I mount the
> cutting disk?
>
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Posted by on September 17, 2006, 4:22 am
>I have never used anything but grinding (what, blades, inserts, disks?) in
>my Makita 4.5" angle grinder, but today I need a cutting disk. It is much
>thinner, so it just spins. The retaining nut is flat on one side and
>flanged on the other. If I turn it around so the flat side is down, rather
>than the flanged side down, it seems to work okay.
>But I don't have the instructions, so I don't know if this is actually
>proper.
>Any catastrophe happen if I use it like this? If so, how do I mount the
>cutting disk?
>
I have an older Black & Decker angle grinder that simply will not hold
a cutting blade. The blades last about 2 minutes before the center
busts out of them. A friend of mine has the exact same grinder and he
said the same thing.
I bought one of those off brand cheap grinders last year. It sold for
$20. After the holidays they were selling it for $12, and it came
with 3 grinding wheels. I figured the wheels alone were worth hald
that price. Well, I have been very pleased with it. It uses cutting
wheels perfectly, and works like a champ. I now use that one for
cutting and my old one for grinding. If they have these cheap ones on
sale again this year, I will get another one. The brand is Tool Shop,
sold at Menards. Normally I dont buy those cheap tools, but for that
price I gave it a try. I figured it was worth the price if I only
used it to cut the nails off used lumber. I rarely pull them anymore,
just grind them off. (I mean big nails, not little lath nails).
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