I would like to buy an automatic torque screw driver that sets itself to the maximum torque during unscsewing ? If any body knows, please do provide information.

Thank you.

matiw, are you asking if the driver ignores torque in reverse, ie its like a fixed screwdriver,
or something that auto senses to prevent shear or indicate a seized screw?

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Hi digitalferrer,

What I want is a tool that sets the reverse torque at the same setting (strength) as the last maximum forward torque used. This is for the purpose of unscrewing and screwing that very sensitive single screw that is used to tighten the actuator arm in the HDA of a HDD.

Hi matiw,

Not had that exact problem but I've seen and used calibrated manual torque drivers and electronic assembly bench gear that can run in reverse.

The problem is that to break a screw back out often requires substantially more than the screw-in force to overcome stiction and any other problems like maybe corrosion or contamination.

Sometimes a gentle tap on a basic screwdriver, or tightening ever so slightly first, can break the deadlock. but as with all hard drive "housewife remedies" it's not to be recommended as a general cure all and certainly not on a calibrated tool.

Although I'm sure you have them, good quality and correct fitting tools also help get maximum force without risking damaging the head.
It certainly isn't a job for the $5 walmart bargain pack of "Jewellers Screwdrivers"

Likely someone else has seen this and can offer more specific advice.

Kern

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Когда хочется кушать – съешь всё.
Голод не тётка!

Thank you digitalferret,

I have never thought of the negative effects of enviromental factors such as corrosion and stiction. Your positive feedback is a great help, and it remindes me of one forumerºs slogan: a fool with a tool is still a fool !

Thank you again.

Like so much in this field, even removing a simple screw will take a certain amount of experience,.... if you have the 'feel', then you will never over-tighten a screw again, let alone wring one out removing it.... it all comes down to pressure applied vs directional torque, and 'feeling' the tool in your hand and listening to what it's telling you.....

Sounds odd I know, but I'm sure there are those that know exactly what I mean.....

Also +1 for digitalferret..... use the correct tool for the job, and always invest in the best tools you can afford, they will last longer (often a lifetime) and give you far less grief!!..

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