ROTARY GRINDER for porting heads?
03-23-2006, 07:12 PM
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Do a search using "die grinder". I like Bosch for electric grinders. One thing to note: the longer you run an electric grinder the hotter it get; the longer you run a air grinder the colder it gets. It is not uncommon for ice to form on an air grinder. Wear gloves and ear protection!
03-23-2006, 09:25 PM
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I bought a Harbor Freight air die grinder (back when they were mail order only) that had such a tremendous wobble that it would jump right back off the surface you were trying to work. JUNK! I have another one, I think it's a Campbell-Hausfeld, that works OK, it does wear on the hands after a while.
I've used a Bosch electric as well, with a rheostat for speed control. It worked fine, it really wore out my hands though.
Wear a surgical mask and good safety glasses, or a full face mask. My first foray in to grinding a set of heads ended at an eye hospital in Atlanta getting a reallly small sliver of metal removed from my eye the hard way.
I've used a Bosch electric as well, with a rheostat for speed control. It worked fine, it really wore out my hands though.
Wear a surgical mask and good safety glasses, or a full face mask. My first foray in to grinding a set of heads ended at an eye hospital in Atlanta getting a reallly small sliver of metal removed from my eye the hard way.
03-23-2006, 09:43 PM
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If you have a good air compressor set up check ebay for air dremel! I got the Rand one with the blue case for 23.00 
It definitly cant be beat man it's awesome!
It definitly cant be beat man it's awesome! 
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04-03-2006, 09:07 AM
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Personally I don't like "variable speed", I like to set a
controlled speed and stick with it.
I've gotten a lot of mileage out of my Craftsman
electric die grinder. It's fat, heavy, awkward and
gets hot after a while (like, wear gloves kind of hot)
but it's done a fair bit of hogging for me. I sometimes
put it on a Variac to lower the speed.
Another, cheap option is a flexible shaft tool. You
can buy the flex shaft, 1/4" chuck at Harbor Freight
stores and chuck the tail into any electric drill, drill
press, etc. and have a fairly lightweight handpiece
(good for those hour+ jobs) that also has a small
"envelope". I put the flex shaft head inside a piece
of shop-vac tube and was able to port the merge in
my Y-pipe, about 6-8" in. If you have a variable
speed drill, there you go. May have to lay a cinder
block on the handle if you're going to hog hard
enough to put some torque back through the shaft.
Foredom makes good quality, motorized-shaft tools
and I have a cheap ancient Black&Decker clone
around here somewhere.
I have air die grinders too but they are third choice
for me, generally. Noisy and greedy; the electrics
just keep on going, the air tool will blow down even
a 5HP compressor pretty quickly. The one good thing
about air tools is you will never burn them out by
stalling the rotor.
controlled speed and stick with it.
I've gotten a lot of mileage out of my Craftsman
electric die grinder. It's fat, heavy, awkward and
gets hot after a while (like, wear gloves kind of hot)
but it's done a fair bit of hogging for me. I sometimes
put it on a Variac to lower the speed.
Another, cheap option is a flexible shaft tool. You
can buy the flex shaft, 1/4" chuck at Harbor Freight
stores and chuck the tail into any electric drill, drill
press, etc. and have a fairly lightweight handpiece
(good for those hour+ jobs) that also has a small
"envelope". I put the flex shaft head inside a piece
of shop-vac tube and was able to port the merge in
my Y-pipe, about 6-8" in. If you have a variable
speed drill, there you go. May have to lay a cinder
block on the handle if you're going to hog hard
enough to put some torque back through the shaft.
Foredom makes good quality, motorized-shaft tools
and I have a cheap ancient Black&Decker clone
around here somewhere.
I have air die grinders too but they are third choice
for me, generally. Noisy and greedy; the electrics
just keep on going, the air tool will blow down even
a 5HP compressor pretty quickly. The one good thing
about air tools is you will never burn them out by
stalling the rotor.
