Electric Constant Pull Machines

Gaines Hillix

Hall of Fame
Another poster claimed that there were no significant differences between the tensioning mechanisms of electric stringing machines. Here is a piece that I believe will help clarify this issue. Even within each type there are differences. My advice is to make sure you ask a lot of questions before you buy such a machine to make sure you're getting what you expect. If the seller can't or won't tell you.....well use your own judgement.

"Important differences distinguish the technologies used in various electronic machines. There are three types of technologies. The first consists of electronics for direct torque control of a motor so that the motor cannot pull more than the desired tension. The second type of electronic technology consists of a motor control linked mechanically to a pre-loaded spring. Tension adjustment is effected by turning a knob that compresses the spring to the desired tension so that a limit switch is tripped and the motor is stopped when the tension is reached. This type of control, which is identified by a tension control knob located to the right of the machine does not provide constant pull because tension has to drop by more than 15 lbs. for the limit switch to turn the motor on again, and this does not normally happen during stringing. The third type of electronic technology is the most sophisticated and relies on a tension sensor(load cell(s) or strain gauge) that is monitored by a microprocessor. This technology offers the potential for many keypad controlled features and is used in the most sophisticated electronic machines."
 
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