1
$\begingroup$

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.

$\endgroup$
4
  • $\begingroup$ A cam would be one possibility. $\endgroup$ – Solar Mike Apr 3 '20 at 22:11
  • 1
    $\begingroup$ How high is the lift, how often, and for how long? Block and tackle doesn't change the amount of work; it just changes the rate at which it gets done. $\endgroup$ – Dave Tweed Apr 4 '20 at 1:11
  • $\begingroup$ Agreed. The specification is incomplete. $\endgroup$ – Transistor Apr 4 '20 at 8:53
  • $\begingroup$ 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: 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'. $\endgroup$ – Russell McMahon Apr 4 '20 at 12:00
1
$\begingroup$

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.

$\endgroup$
0
$\begingroup$

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.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.