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Posted by DoN. Nichols on February 24, 2008, 9:44 pm
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> clare at snyder.on.ca wrote:
[ ... ]
>> The mass of the wrench absorbs the "instantanious torque" or "impact".
>> Mean torque, or average torque, may be as little as 100-150 ft lbs and
>> still have a 1000 ft lb rating - without stretching things at all (or
>> very little)
>
> OK, makes sense. Same theory as the traditional striking wrenches. But
> the wrench must be pretty heavy to achieve such a number.
Another factor is that the "wrench" which is struck benefits
from being light, as long as it is sufficiently rigid. IIRC, these were
advertised as being titanium, which is light but rigid. So make the
part which is struck to transmit torque to the actual wrench socket as
light as possible (titanium), and the hammer part as massive as possible
(tungsten?) for maximum transfer of energy to the nut.
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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Posted by Carl Boyd on February 23, 2008, 12:00 pm
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>I bought what is apparently the most powerful 1/2" drive impact wrench
> available IR 2135 with 1000 ftlb or torque and am still finding it
> weak. The other day it would not remove the bolts that hold on my
> front brake caliper bracket and sometimes it wll not remove lugnuts. I
> am using it at 125psi with 50' of 3/8" hose and 1/4" M (milton) quick
> connects). Would going to 3/8" qc fittings help at all? I notived a
> local tire shop has the air pressure at 150 psi. Is this what is
> needed? How come air tools say never to go above 90 psi?
Mark
In theory the bigger QC will help, I am using a IR2132 (700 ft-lb rated)
with 1/4 QC. Other things to check.
1) Is the tool oiled. Air tool oil not only makes them last longer it makes
them work better. I put in a couple of drops every time I connect up the
any of my air tools to the hose.
2) Are you using any extensions? In my experience every extension, swivel,
or adapter I put on the Impact wrench seems to reduce the force applied at
the bolt or nut.
3) Are all controls on the gun set to max? (sorry had to ask) On my IR2132
the power control only seems to affect the tightening function not the
loosening function, your may be different.
4) is you air compressor tank at the bottom of the pressure range? On tough
bolts, I run the impact wrench until the air compressor kicks on, then wait
until it stops and I have max pressure in the tank. The difference in
performance between 90 and 125 PSI is significant.
The only time my IR2132 has not been able move things was a harmonic
balancer bolt, where I needed an extension and a 1/2 to 3/4 adapter to
reach. It struggled on one very rusty set of lug nuts on a truck I bought
that the previous owner appears to run on the beach every weekend. I had to
use the cycle the compressor trick in that case.
Carl Boyd
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Posted by Tim B on February 23, 2008, 12:07 pm
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> I bought what is apparently the most powerful 1/2" drive impact wrench
> available IR 2135 with 1000 ftlb or torque and am still finding it
> weak. The other day it would not remove the bolts that hold on my
> front brake caliper bracket and sometimes it wll not remove lugnuts. I
> am using it at 125psi with 50' of 3/8" hose and 1/4" M (milton) quick
> connects). Would going to 3/8" qc fittings help at all? I notived a
> local tire shop has the air pressure at 150 psi. Is this what is
> needed? How come air tools say never to go above 90 psi?
Probaby going to the 3/8 fittings would help some, but you have a high air
consumption tool there and though the pressure provided by your compressor
may be adequate likely the air flow output is not. I have an IR 231 I use
with a 2.5 HP compressor, and have had no trouble with any lugnut or
caliper bolt I've used it on. It works well on the relatively low cfm of my
compressor, much better than the cheapo CH one I had before it. Mind you,
I've used it on nothing bigger than the lugnuts of a 3/4 ton GM van.
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Posted by Brent on February 23, 2008, 12:10 pm
Please log in for more thread options > I bought what is apparently the most powerful 1/2" drive impact wrench
> available IR 2135 with 1000 ftlb or torque and am still finding it
> weak. The other day it would not remove the bolts that hold on my
> front brake caliper bracket and sometimes it wll not remove lugnuts. I
> am using it at 125psi with 50' of 3/8" hose and 1/4" M (milton) quick
> connects). Would going to 3/8" qc fittings help at all? I notived a
> local tire shop has the air pressure at 150 psi. Is this what is
> needed? How come air tools say never to go above 90 psi?
http://www.irtools.com/IS/category.aspx-en-2844
someone sold you an impact with a marketing torque value the 2135's
top out at about 500 foot pounds in forward and 700 in reverse and
that will be in ideal conditions. and ideal conditions mean that your
arm doesnt twist on the impact blow
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Posted by Dan on February 23, 2008, 2:30 pm
Please log in for more thread options Brent, an impact wrench doesn't impart a reverse moment to your arm or
hand that equals the torque being applied to the fastener. It's the
hammering that applies the elevated torque.
Personally I only use the impact wrench rarely. I use my torque
wrenches a lot. I torque a lot of turbine casing bolting and we heat
and tension most of them. It is a very interesting process.
>someone sold you an impact with a marketing torque value the 2135's
>top out at about 500 foot pounds in forward and 700 in reverse and
>that will be in ideal conditions. and ideal conditions mean that your
>arm doesnt twist on the impact blow
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