Steve Blackmore wrote: > I won't use helical beam couplings on anything. As said previously - > they snap all too easily and if you have any backlash, they wind up and > you may never get the full linear movement if there is any resistance. > > Helical couplings work great on encoders, tachometers, etc. that have little friction and inertial load. I've used them for years in that application. But, only VERY special and expensive units can handle the repeated torque reversals and shocks of a CNC drive motor. There are helical and slotted couplings made specifically for motor drive applications, but most are made for "instrument" use, and rated at very low torque.
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