by Thing-O-Fun, published

Thing-O-Hoist by Thing-O-Fun May 21, 2012

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Thing-O-Hoist by Thing-O-Fun is licensed under the Creative Commons - Attribution license.

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This is a print ready chain hoist capable of 30lbs or more (30lbs is all I had on hand to test with). 8x16x4 Ball Bearings, #10 Ball Chain and 3 different M3 screws are required to make this function.

Video: http://vimeo.com/42907056

The system has a 3 stage reduction. They are as follows:
Drive 2 to Drive 1: 27:9 or 3:1
Final Drive to Drive 3: 27:9 or 3:1
Doubler Pulley: 2:1
For a total reduction of 18:1

Purpose of this thing: I was bored and had a few bearings sitting around so I decided to see how much I could lift using plastic.


Start by printing a few copies of Drive 3. You will need to modify your print profiles to make sure that the inner area of each tooth is filled in. They need to be solid to transmit the torque required.

Once you have a gear that is solid, continue printing the rest of the components.

Press the bearings into the recesses in the two sideplates, the Final Drive and the pulley.

Add Drive 1, Drive 3 and Final Drive to Sideplate Left.

Add Drive 2 to the other side of Sideplate Left. It usually helps to have Drive 1 pushed out when adding the Drive 2 gears.

Press ends of the load ball chain into Ball Retainer and MirrorBall Retainer. Secure these to the correct location on Sideplate Right using M3x12 Flathead.

Add the Hook to Sideplate Left and assemble with Sideplate Right. Use 3 M3x16s to secure it together. Note: at this time, you will need to wrap the load ball chain around Final Drive otherwise you won't have a load on the drives. It takes some trial and error to make it wind the correct way. The load portion of the chain should be centered in the middle and not off to one side.

To test the mesh and make sure everything is wound correctly, lightly add Input Drive to Drive 1 and turn clockwise. Your load should go up at this point. If it does not, it is not wound correctly. Correct and check again.

Add the two Ratchets to the Sideplate Right. Point them towards the center to make assembly with the Input Drive easier.

Add the Ratchet Plate, the Spring and the Spring ring to the Input Drive.

Press this assembly on to Drive 1 until the Ratchets touch the back of the Ratchet Plate. Using a screwdriver or other impliment, turn the ratchets so they engage the ratchet plate correctly while applying pressure to the Input Drive. Once it is completely seated, add the M3x12 to hold it all together.

Add the drive chain and then the two top sections

Finish by assembling the doubler in place on the load chain.

You now have a fully functional chain hoist.

Cheap #10 Ball Chain
The continuous length is necessary for the input chain only.

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So... Has this received some more deserved testing? Whats its point of faillure? How about adding weight until it breaks appart? This thing could be very usefull if we can get it to the point of lifting some serious weight. With a few iterations im sure it can get far.

If you're into superior price for inferior(yet to be tested impression) quality. http://www.avidrc.com/product/8/metric-bearings/374/8x16x4-Metal-688ZZ/B4-metric-bearings.htmlhttp://www.avidrc.com/product/...

This is the final piece of hardware I need. I'll be lifting things left and right by weeks end.

3D Printing level 589

I am just about through the printing process. How many lengths of the chain did you purchase? This is obviously variable depending on the height I want to hoist my weight. In this case, how long are your chains?

Mine used 2 of the continuous chains that were 96" long. The first one I left as a continuous loop for the hand chain and I cut the second open to be used as the load chain. A link to the chain I purchased is in the instructions. This is the cheapest place I was able to find in the US.

Printable on a Cupcake bed (fully Pololu upgrades)?

I have printed all those parts in your download list with the UP printer and those parts fits perfectly to each others.

Looks like there is some downloads missing. I can not find ball retainers ( part #: 15 and 17). Do you mine to add these .stl files to your list of downloads?

Sorry, must have missed those. Should be corrected now.

Thing-o-fun has done it again! I tip my hat to you good sir!

That's incredibly cool. Is there a video available of it working?

The ticking sound in the video is the ratchets moving on the ratchet plate, this is what stops the load from just coming crashing down. When lowering, the ratchet plate slips on the input wheel so as long as you apply enough force to the input chain (I would estimate 5 lbs) you can lower the load. Since this ratchet is at the input side of the drive system this means that the force gets multiplied, ending up with around a 90lb holding force on the load chain.

That's very very cool. Thanks for the video!

Very cool, nice video!

Very nice job, and more importantly is since this is printed it can be tested to failure and the weakest link easily repaired and then improved. AND the hoist is not heavier than the stuff it lifts so it is easy to move around. This will be used for many years.

Thank You