Essentially I have a 100 lbs. pile driver with an eyelet for lifting it on top. (It's on rails) I want to set up and automated machine to lift and drop the driver at a variable pace. Preferably I would like to use a cheap electric motor. I can use pulleys, and/or a block and tackle system to reduce the amount of work the motor needs to do. I can route/3D print materials if need be. I have looked at mechanical systems and setups all over the internet, but have yet to find a simple effective solution for what I am trying to do.
100 lbm =~ 45 kgm.
Wattage =~ kg x metres_vertical x 10 / time_seconds.
So per metre of head,
power = 450 Watts / seconds_to_lift.
A battery electric drill (or even a mains drill) with a "drum" driven by the chuck can be as low geared as you wish. You can also buy geared motors.
At say 120 RPM = 2 RPS (drill on low speed screw driving mode) say with a 25mm / 1 inch dia drum
~= 80 mm circumference = 160mm vertical/second
= 6s for 1m lift so about 450/6 = 75 Watts. Say 100 Watts plus.
Smaller dia drum = slower = less watts.
Release could be electromagnet.
Could use endless 'rope' with 'carriages' or return carriage each time.
A threaded rod driven by a drill or geared motor is also a potential low cost and 'not too hard" solution.
You can have your motor attached to a vertical chain rolling around 2 pulleys.
This chain with several brackets constantly moves a one hundred lbs metal ballast which is assembled on the shaft of your mechanical hammer and releases it on top.
It drops down repeatedly, banging you jack-hammer onto the job.