Recent content by RobustZA

Another thing that I didn't consider. Acme threaded rod was my first thought when I started this project but when I stumbled across the ball screws I thought the low resistance factor would work in my favour. I didn't consider that the weight of the TV assembly would push the motor backwards...

Thanks again. I have a mate who is an electronics boff who will help me with the circuitry thanks for the advice as I didn't think of that at all.

Great ... thanks for your help. This confirms all my thoughts on the matter. I was also thinking of including a potentiometer in the circuitry to fine tune the speed, but to let the gearing do most of the work.

Thanks, I was thinking that 100mm/s was a good speed to work on so a 2:1 gearing would be fine. Also I was planning on including a limiting switch ±150mm before reaching the top to slow down the speed and then a final limiting switch to end the run. How would one de-rate a motor?

As far as gear ratios go ... if I attach a gear to the drive shaft of the motor and a gear to the bottom of the ball screw I think I would need a gear ratio of ±1:2 to get the rprm right, but would this give me sufficient torque? Would the ball screw add to the torque?

Kindly help. I am looking to build a linear actuator to make a lifting device for a television. The weight of the television and the stand are about 30kgs. I have a motor with the following details:- 12V DC 120W 8mm D-Shaft RPM No load 3200rpm RPM with load 2500rpm What gearing system would...