There are different technologies and options in the market when it comes to torque electric screwdrivers for the assembly industry, but how do you choose the right one for your particular needs?
Here are some points to consider when evaluating the ideal screwdriver for your assembly line.
Target Torque &#; Probably the most important data point to consider when selecting an electric screwdriver, make sure the target torque is within the screwdrivers torque range. Constant use above 80% of the screwdrivers nominal capacity is not recommended and can wear out the motor.
Precision Level &#; Each assembly process has different quality and repeatability requirements and different technologies will allow you to reach the precision level your application need.
As a rule of thumb you can expect the following precision range for these technologies:
Clutch Control: +/- 7%
Current Control: +/- 5%
Transducerized: +/- 3%
(meaning the actual torque value will be within the percentage indicated above)
Angle Requirement &#; Some applications have specific angle requirements and not all screwdrivers have angle monitoring and control; you typically have to move into the higher end of the torque tool market in order to have this capability.
Speed Requirement &#; Some applications require specific speed levels to meet the assembly quality needs and productivity rates.
Multiple Torque Capability &#; Some applications require more than one torque to be applied during assembly, typically due to different screws being used for different parts. Rather than using multiple screwdrivers, an operator can utilize a multi-torque screwdriver that can be programmed to handle a variety of torque levels (up to 100 with Kolver&#;s K-Ducer line).
Output Signal &#; For quality and process control, some applications require output signals; some common signals are START, STOP, and OK, but more sophisticated systems can output many more.
Input Signal &#; If you need to remotely control the operation of the assembly process, make sure the screwdrivers controller has the input signals available. These signals can allow you to start & stop the screwdriver or even change programs or configurations from a PLC or PC.
Fastening Data &#; Some applications need to gather, register and export the operation data for quality control and traceability. If this is a requirement make sure your assembly system can process and export this information. Common data that can be exported is Target and Final Torque, Screw #, Program #, Angle, of course date and hour, as the screwdrivers information.
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These are some important factors to consider when selecting the right torque screwdrivers for your assembly needs. However, there&#;s many other important considerations to take into account when evaluating a purchase &#; ergonomics, performance, reliability, cost, and more.
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The only +/- ones I have are bits for my torque screwdriver!But they do make a difference as often the screw heads are easy to damage at higher torques, even if to begin with you are just given the job of dismantling stuff so unscrewing a tight fastener.For many years the skill of sensibly tightening terminals was something that was learned as an apprentice, etc, so you could reliably make connections that would not undo with vibration or thermal cycling, as well as not leading to damage to the wire and/or cable clamp itself. But with the number of botched installations presenting a fire risk the industry has moved towards the use of torque tools to try and reduce dependency on such skill and to help get better control over results.Also a torque set is quite a handy way to get a feel for what is correct for 2Nm, etc, but you can probably borrow one for such a trial.That is much the same as garages have been for last 50+ years, most bolts/nuts are done by hand, but critical ones like cylinder head, water pump, driveshaft, etc, finished with a torque wrench.Another factor is stuff being poorly done and often damaged on assembly is monkeys using an impact wrench. Except for some very specific tools,use a power tool on electrical terminals! Most impact drivers will, even at the lowest setting, hammer the faster home to a much higher torque that most can cope with. Typically the only ones likely to survive are going to be M8 or larger studs, etc. A moment's carelessness with my own impact driver (Milwaukee M18FID2) resulted in me shearing a M6 roofing screw when assembling cable try, so I am not joking!Having said that, my impact driver is a most excellent tool to have (though not the cheapest) for drilling with the hex-shank bits, using the 20mm - 32mm hole saws for glands, etc, and for mechanical assembly/disassembly on larger wood screws or bolts as it really gets the job done quickly.TL;DR Concentrate on basic hand tools first (as @nicebutdim said), then look at some useful power tools for mechanical work and as you get to assembly CU or other stuff with high current terminals then look at a torque set.
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