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A Puzzled Tinkerer
Reviewed in the United States on August 2, 2024
My project called for a stepper motor (responding to a 4-20 Ohm signal) to rotate a variable resistor contrlling resistance on an external/isolated circuit. The stepper is advertized as having a 5mm shaft. The resistor has a 6mm shaft. This seemed like the perfect coupler.But since the "set screws" are aligned on the same side at both ends, any slack between the shaft and the coupler results in skewing of the coupler in opposite directions. This means that even if the shafts are aligned properly, the coupler is subject to a bending force. And if the shafts are less than perfectly aligned, that force rises and falls as the system turns.I wonder if placing one set of set screws 180 around the coupler would diminish this slight system resistance?
H. F.
Reviewed in the United States on July 27, 2024
In theory, coupling two shafts together is easy... in practice, not so much. A rigid coupler is really only viable when shaft alignment already known to be perfect. In cases where you need robust coupling in the face of modest angular misalignment, a coupler like this one from XIKE might be in order.This particular product consists of a single 3-mm to 5-mm (spiral-slit) flexible shaft coupling. Comprised of aluminum, the coupler is 25 mm in length and 19 mm in diameter. The seller promotes these as motor or encoder couplers in “3D Printer CNC Machines,” though they are likely useful for any low-torque shaft-coupling needs.Ham radio guys... 6-mm is just shy of a quarter inch. The 6-mm end of this couple can easily be reamed/bored to fit standard 1/4-inch shaft hardware.
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