Quote:
Originally Posted by Micah Chetrit
it is significantly slower than when we had a 1:1.5 gear ratio that wasn't overly tight on the bottom.
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This leads me to believe that your 1:1.5 ratio allowed your motor to run closer to it's maximum power.
A motor's rpm under load is determined by how much torque it needs to generate. Do the math and figure out what torque your motor is seeing (this will be based on the force of your surgical tubing, mechanical advantages, and gear ratios), then look up how much power it is generating at that torque.
You may do well to adjust your reduction so that it's running closer to peak power.