Dr. D & JBA
Thank you for your generous time to respond and I appreciate the input.
The calculations I have made are posted in the spreadsheet. I believe they are accurate in terms of rotation and distance traveled per seconds, but I have been wrong before. The only seat-of-the-pants estimate...
I am building a lift using 4 threaded spindles and sprockets to travel 12 feet.
The motor needs to have 56 mount as it will be mounted vertically (Shaft down) attached to a sprocket that drives a chain to the 4 supporting sprockets.
The load (1,000 lbs, 250 lbs at each corner) will be lifted...