How to Build an Electric Hoist from Scrap Metal
- Salvaged worm gear from gear reducer
- Spare metal plates
- Various nuts and bolts
- Welding gear and safety equipment
- Large ball bearings
- 1/2 HP induction motor with button pendant
- Rubber timing belt
- Steel hoist cable with hoist pulley and hook
- Power drill
- Mini lathe
With all your bits and bobs in hand, it is time to get on with the build. Be warned, however, that you will need some experience with welding and using power tools like a lathe.
First, grab your salvaged worm gear and fasten to a spare metal plate, as shown in the video.
Bend other pieces of steel plate to enclose the worm gear and weld to the base plate. See the video for more guidance on this.
Next, take two large ball bearings, mark out the holes, drill, and attach them to the worm gear base, as shown in the video. Also, ensure you add the main gear wheel before securing firmly with bolts.
Test the gear before moving on. It should move freely with some resistance.
Angle grind one end of the worm gear axles and attach a suitably sized pulley wheel, as shown in the video. Secure tightly.
Now, grab another piece of metal sheet and your induction motor. Secure the motor to the metal sheet as shown. Also, attach the main winch mechanism to the same steel sheet as shown.
Connect the motor and hoist winch assembly using a rubber timing belt. Make sure the belt is pulled tight before you secure the winch assembly in place.
You will likely need to mark out and drill holes for the bolts.
Power up the motor and check the winch mechanism turns smoothly. Adjust if needed.
Next, grab a length of metal rod and drill a hole through the middle using a lathe.
The diameter of the hole needs to be the same as the exposed worm cogwheel axle of the winch assembly. Secure it tightly using a nut, if needed (you may need to drill a hole through the axle and length of the tube).
Now take two disks of steel and another length of wide-bore tubing. These wheels will be used to hold the hoist cable. Assemble as shown in the video -- will need some machining and welding.
Next, insert and weld the tube you made earlier into the center of the hoist cable holder. Weld securely, again as shown in the video.
Reattach and firmly secure it to the main hoist gear assembly. Create and attach an attachment plate (with ball bearing) for the other side of the hoist cable assembly.
Again ensure all moving parts move freely. Weld components to the base plate as needed. Use some L-shaped strips of metal to build mounting rails for the entire assembly.
Weld to the base as shown.
Add cross members if needed for added strength between the mounting rails. Now, coil some steel cabling around the cable holder as shown in the video. Ensure it is securely fastened.
To make this task easier, hold the cable at one end and turn on the motor at a slow speed to wind the cable.
Attach the hoist pulley and hook to the free end of the cable (unless the cable comes with one attached). Now fashion a spring-loaded hoist cable pressure plate using spare metal plates and a spring.
Weld to the base plate.
With that, your hoist is effectively complete.
Now simply set up your hoist, make sure it is securely fastened, and begin testing the limits of its lifting capacity. The one in the video lifts in excess of 396 lbs (180 kgs).
A team of scientists from Nanyang Technological University, Singapore, grew leafy vegetables without soil, using hair as the primary growth medium.