[Raul]

First I want to tell you that we have done a continuous cable lift many times and have never had a problem.

I am having a hard time following your math. But, before you go too far, check the feasibility of your concept:

1) First do a simple calculation to determine if any motor can do what you wish to do.

- Power = distance*force/time.

- Example: need to lift 10 lbs, 10ft in 2 seconds -> Power required is 50 ft-lb/sec, which is about 0.1 HP or 75Watts.

- If you choose a motor with more power than you need, you can gear it to run a little faster and be more efficient. If you choose a motor with less power, it simply will not be able to lift the load as quickly and will have to be geared accordingly.

2) Pick the proper gearing for the drum diameter.

- Since you know how much distance you get with one rotation, you can now choose the gearing that will allow the chosen motor to move it at the chosen speed.

- Example: 5” OD drum you chose can move 10ft in a little more than 6 turns, so you need to go 3 RPS or 180 RPM in order to lift the 10 pounds, 10ft in 2 seconds.

- Again, you cannot accomplish this if the motor does not have enough power.

- Using the motor curve you choose you can compare it RPM at peak power to the RPMs you need and that tells you the gear ratio you need.

This was just a quick guide, I think there are white papers on CD that tell you how to pick a gear ratio.