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[OM] Re: Attention : 16mm fisheye owners - now: 21/3.5 owners

Subject: [OM] Re: Attention : 16mm fisheye owners - now: 21/3.5 owners
From: Moose <olymoose@xxxxxxxxxxxxxxx>
Date: Sun, 12 Mar 2006 15:55:21 -0800
Fernando Gonzalez Gentile wrote:

>on 12/03/2006 05:21, Moose at olymoose@xxxxxxxxxxxxxxx, wrote:
>
>Hi Moose,      
>
> <BIG SNIP>
>
>This really puzzles me. Never knew, and cannot understand why a screw may
>become loose if a certain amount of weight is put on the driver.
>  
>
The purpose of the weight is not to make the screw easier to turn. It is 
to make sure the driver doesn't climb/slip up out of the hole and damage 
driver and/or screw head in the process.

Similar to a Phillips, the crosspoint driver has slanted sides to the 
flutes that engage the screw. Under enough torque, there is not enough 
friction to keep the driver from slipping up these slopes, ramps, 
whatever they may be called. The driver then slides up until there is 
becomes less and less fully engaged with the head. Then the projections 
of both pieces are engaged out near their thin ends and either the 
driver jumps out and bangs things outside and/or some of the mating 
parts bend or shear off.

This is the price of a system that allows the use of only a few sizes of 
drivers for many screw head sizes. Many other driver systems, hex, 
bristol, T, square, etc. don't have this problem, but require many more 
driver sizes to handle multiple driven fastener sizes. For example, in 
my kit of small driver bits, there are 5 Phillips bit sizes and 16 T 
spline bits

Moose


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