Hi
I recently had problems removing the 22mm AF pulley nut from a vehicle alternator.
Difficulty is in holding the pulley whilst the nut is removed with a socket wrench, and applying approx 100 ft lbs.
Yes, I tried most methods.
In some desperation, I bought an Ozito !2 Volt DC half inch drive Impact Wrench from Bunnings at $55, and intended for use with vehicle wheel nuts.
I bought a matching quality single (six flats) 22mm impact socket from Supercheap at $2 each.
I had the nut off in two seconds!
I was amazed!
I knew an air rattle gun would have worked, but, ... this economy thing!
I was curious how this thing works, as when you pull the trigger, it spins up for two seconds then gives a single "clack", and this cycle is repeated.
It is not like the repeated clack - clack of an air tool.
I was going to replace the thin power cable anyway, and remove the supplied cigarette lighter plug, ...and ...curiosity intervened, and I pulled the tool apart to see how it works, blowing the warranty (At $55, it is almost throwaway).
I thought someone else might like to see how it works.
The rotary steel mass is mechanically connected via a sliding and loose hex shaft coupling to the motor at all times, and the front 1/2 inch drive shaft is not connected, but rotates on a round shaft attached to the front of the mass, and on the same axis.
When the trigger is pulled, the DC motor spins up the rotary mass, and at some revs (200 RPM ?), a centrifugal mechanical switch activates and projects a round steel pin from the spinning mass and connects with and drives an arm on the front drive-shaft.
Clever, and cheap to manufacture.
Slow in actual operation due revs run-up time.
The tool mechanical quality is just OK for occasional use, not for repetitive wheel nuts.
The switch is probably underrated, and uses a system of thin wire and push-in style electrical connection, and not screw type connections; this is a real negative and cannot be easily fixed or replaced.
I fitted a shorter length of twin 2.5mm2 cable to mine, straight to alligator clips.
The wrench measured current draw is about 12 amps at start, falling to about 6 amps on run.
Claimed torque is 260NM approx 190 ft lbs. Feels about 80 ft lb on a 22mm socket, but it is an impact.
A very useful tool for very occasional use.
No associations with either company.
mike
DSC01748lo.jpgDSC01750lo.jpg
I recently had problems removing the 22mm AF pulley nut from a vehicle alternator.
Difficulty is in holding the pulley whilst the nut is removed with a socket wrench, and applying approx 100 ft lbs.
Yes, I tried most methods.
In some desperation, I bought an Ozito !2 Volt DC half inch drive Impact Wrench from Bunnings at $55, and intended for use with vehicle wheel nuts.
I bought a matching quality single (six flats) 22mm impact socket from Supercheap at $2 each.
I had the nut off in two seconds!
I was amazed!
I knew an air rattle gun would have worked, but, ... this economy thing!
I was curious how this thing works, as when you pull the trigger, it spins up for two seconds then gives a single "clack", and this cycle is repeated.
It is not like the repeated clack - clack of an air tool.
I was going to replace the thin power cable anyway, and remove the supplied cigarette lighter plug, ...and ...curiosity intervened, and I pulled the tool apart to see how it works, blowing the warranty (At $55, it is almost throwaway).
I thought someone else might like to see how it works.
The rotary steel mass is mechanically connected via a sliding and loose hex shaft coupling to the motor at all times, and the front 1/2 inch drive shaft is not connected, but rotates on a round shaft attached to the front of the mass, and on the same axis.
When the trigger is pulled, the DC motor spins up the rotary mass, and at some revs (200 RPM ?), a centrifugal mechanical switch activates and projects a round steel pin from the spinning mass and connects with and drives an arm on the front drive-shaft.
Clever, and cheap to manufacture.
Slow in actual operation due revs run-up time.
The tool mechanical quality is just OK for occasional use, not for repetitive wheel nuts.
The switch is probably underrated, and uses a system of thin wire and push-in style electrical connection, and not screw type connections; this is a real negative and cannot be easily fixed or replaced.
I fitted a shorter length of twin 2.5mm2 cable to mine, straight to alligator clips.
The wrench measured current draw is about 12 amps at start, falling to about 6 amps on run.
Claimed torque is 260NM approx 190 ft lbs. Feels about 80 ft lb on a 22mm socket, but it is an impact.
A very useful tool for very occasional use.
No associations with either company.
mike
DSC01748lo.jpgDSC01750lo.jpg
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