Good quality screwdriver?

PetiteFleur said:
Try and get a long screwdriver with a hex or square shank so you can get a spanner on it. you then lean heavily on the screwdriver whilst trying to torn it with the spanner(perhaps with an assistant?). The tip must be a very good fit in the slot of course.
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Or one of these with a screwdriver bit. Plenty of torque and its a one-man job.
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If it's an alloy screw I wouldn't worry about the quality of the screwdriver. Just use anything half decent but grind the tip to get as good a fit as possible. You will however easily shear the screw. Sometimes its possible to loosen small seized screws by using a hot air gun to heat the area then squirting cold penetrating oil on it. I've sometimes done this 5 or ten times. The combination of thermal shock and sudden contraction of any gas in the threads seems to help to draw in the penetrating fluid. If the screw doesent respond to gentle force it's going to shear. Try looking up the shear strength of the fastener before you start. Otherwise if its alloy it should be easy to drill out.
 
KAM said:
If it's an alloy screw I wouldn't worry about the quality of the screwdriver. Just use anything half decent but grind the tip to get as good a fit as possible. You will however easily shear the screw. Sometimes its possible to loosen small seized screws by using a hot air gun to heat the area then squirting cold penetrating oil on it. I've sometimes done this 5 or ten times. The combination of thermal shock and sudden contraction of any gas in the threads seems to help to draw in the penetrating fluid. If the screw doesent respond to gentle force it's going to shear. Try looking up the shear strength of the fastener before you start. Otherwise if its alloy it should be easy to drill out.
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I depends what the alloy is, High tensile steel, stainless steel, brass, bronze etc etc
 
Poignard said:
No, I have often wondered that myself.
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It might have something to do with the angle your arm(s) can form with the shank; an acute angle, i.e. your elbows are closer to the plane that the screw is perpendicular to. A shorter screwdriver will only allow your arms to be at rightangles to the driver.
 
markspark7 said:
Longer shaft usually mean larger cross sectional area of the shaft so more grip inside the moulded handle that is applied post shaft production.
However blade fit is far more important that length. A screwdriver with added hex drive towards the top of the shaft closest to the handle will apply far more torque with the addition of a spanner then any human hand can apply. View attachment 103671View attachment 103671
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Those are Hammer Thru, you hit the top of the handle quite fast with a Hammer. At the same time turning with the other hand.
The force used for both should not be that much to begin with. You just hit harder and turn harder. Until it shifts or shears.
 
VicS said:
I depends what the alloy is, High tensile steel, stainless steel, brass, bronze etc etc
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I would never use the term "alloy" by itself myself but in common usage it tends to mean aluminium. Which is what I assumed as I thought the OP would not have been so concerned about damaging the head otherwise.
 
Another vote for manual impact driver. If it is seized, it isn't torque you want, but the shock to break the fastener free. Once it starts moving, you are (almost) home free....
 
Moodysailor said:
Another vote for manual impact driver. If it is seized, it isn't torque you want, but the shock to break the fastener free. Once it starts moving, you are (almost) home free....
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Another good tip is to try tightening first. This can break the bond without damaging the screwhead in the "unscrew" direction.
 
Spirit (of Glenans) is right, I have read an article on this sometime ago, I can't remember which. There has been lots of research for H&S and productivity in manufacturing.

From an abstract of another one behind a pay wall we have:

"Wrist orientation also had a significant influence on how much torque individuals could exert."

A long handle allows you to get your shoulder behind it bringing in extra muscle groups, and gives you a better wrist position.

Handle shape made a difference on your ability to grip.

All to no avail if the bit doesn't fit the slot exactly.
 
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