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Posted by Bernard Arnest on March 15, 2008, 3:04 am
Hi!
I do marble carving; started somewhat recently. I've used
chisels so far, but I really need to look at rotary for undercuts and
delicate areas.
I'm considering foredoms, but, air die grinders appeal-- buy a
compressor, which I need for many things anyway , and then plop $20-
$100 for a pneumatic die grinder. They're also higher-rpm, possibly a
benefit though overheating can be as much a worry at high rpm as
chatter may be at low.
For both I worry about dust. Marble... seems harder than mild
steel, when I accidentally forged some mild steel chisels they
mushroomed over instantly; but is rather softer than tool steel. So
the case may be made that some parts in the die grinder are going to
abrade anyway so I should get cheap and recyclable grinders?
This varies categorically. I don't buy dirt-cheap bits for
example, the steel quality and grinding precision is pitiful; a mid-
range I find sufficient value for my needs. I do buy cheap ear
protection, gloves, some lifting equipment-- sometimes the difference
between name brand and brand X is only that, and the products are
identical.
So where do die grinders fall? What brands do you like? If I
might burn through bearings; are some better shielded for longer
lifespan --enough so, that $/hour used is lower? Harbor freight?
Random ebay powersellers?
Another issue, beyond bearing slop, is air consumption (also a result
of machining tolerance). My compressor does 8cfm, theoretically, at
90psi; but if name brand vs. brand x is a difference of a few cubic
feet per minute, might be worth the name brand? If only for the noise
(quiet matters) :-)
thanks!!
-Bernard
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Posted by on March 15, 2008, 8:54 pm
i use the harbor freight ones ,throw away when they go bad.i bought a
expensive one and it only lasted a little longer..lucas
http://www.minibite.com/america/malone.htm
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Posted by on March 15, 2008, 9:51 pm
Grinders won't fail if you keep them lubricated with air tool oil.
Don't waste your time on fractional horse power die grinders.
Purchase a one horse power die grinder for about $100
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Posted by HeyBub on March 16, 2008, 11:23 am
Bernard Arnest wrote:
> Hi!
> I do marble carving; started somewhat recently. I've used
> chisels so far, but I really need to look at rotary for undercuts and
> delicate areas.
> I'm considering foredoms, but, air die grinders appeal-- buy a
> compressor, which I need for many things anyway , and then plop $20-
> $100 for a pneumatic die grinder. They're also higher-rpm, possibly a
> benefit though overheating can be as much a worry at high rpm as
> chatter may be at low.
> For both I worry about dust. Marble... seems harder than mild
> steel, when I accidentally forged some mild steel chisels they
> mushroomed over instantly; but is rather softer than tool steel. So
> the case may be made that some parts in the die grinder are going to
> abrade anyway so I should get cheap and recyclable grinders?
> This varies categorically. I don't buy dirt-cheap bits for
> example, the steel quality and grinding precision is pitiful; a mid-
> range I find sufficient value for my needs. I do buy cheap ear
> protection, gloves, some lifting equipment-- sometimes the difference
> between name brand and brand X is only that, and the products are
> identical.
> So where do die grinders fall? What brands do you like? If I
> might burn through bearings; are some better shielded for longer
> lifespan --enough so, that $/hour used is lower? Harbor freight?
> Random ebay powersellers?
> Another issue, beyond bearing slop, is air consumption (also a result
> of machining tolerance). My compressor does 8cfm, theoretically, at
> 90psi; but if name brand vs. brand x is a difference of a few cubic
> feet per minute, might be worth the name brand? If only for the noise
> (quiet matters) :-)
Pay attention to the RPM. Proper speed varies depending on the target:
Fine grinding < 10,000 RPM
Rough grinding and buffing 10,000 - 20,000 RPM
Metal > 20,000
They cost less than $20 at HF. If it wears out, toss it.
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> I do marble carving; started somewhat recently. I've used
> chisels so far, but I really need to look at rotary for undercuts and
> delicate areas.
> I'm considering foredoms, but, air die grinders appeal-- buy a
> compressor, which I need for many things anyway , and then plop $20-
> $100 for a pneumatic die grinder. They're also higher-rpm, possibly a
> benefit though overheating can be as much a worry at high rpm as
> chatter may be at low.
> For both I worry about dust. Marble... seems harder than mild
> steel, when I accidentally forged some mild steel chisels they
> mushroomed over instantly; but is rather softer than tool steel. So
> the case may be made that some parts in the die grinder are going to
> abrade anyway so I should get cheap and recyclable grinders?
> This varies categorically. I don't buy dirt-cheap bits for
> example, the steel quality and grinding precision is pitiful; a mid-
> range I find sufficient value for my needs. I do buy cheap ear
> protection, gloves, some lifting equipment-- sometimes the difference
> between name brand and brand X is only that, and the products are
> identical.
> So where do die grinders fall? What brands do you like? If I
> might burn through bearings; are some better shielded for longer
> lifespan --enough so, that $/hour used is lower? Harbor freight?
> Random ebay powersellers?
> Another issue, beyond bearing slop, is air consumption (also a result
> of machining tolerance). My compressor does 8cfm, theoretically, at
> 90psi; but if name brand vs. brand x is a difference of a few cubic
> feet per minute, might be worth the name brand? If only for the noise
> (quiet matters) :-)