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The aluminium support for the TBR rails is stronger than on the SBR rail, and the bearing blocks for TBR are bigger and flanged, which spreads the load again making them stronger.

Compare the...

Yes it's all about teeth in mesh.!! With small pulleys there are less teeth engaged between belt and pulley, less teeth engaged means less able to handle high loads and reduce the amount of torque...

As Jonathan says, you need it to overcome the inductance of the motor windings.

Inductance tells you how unwilling a circuit is to change the flow of current. It's all about building up and...

You should set the drivers to the setting closest to (but not greater than) 2.1 amps. If you had wired them in bipolar parallel (presumably you have your reasons for not doing this) then you would...