Finding a Drum for Motor Shaft to Lift 5kg Box

[TechTree]

Hello, I'm trying to use this gearbox motor as a winch to lift up a small box (5kg), however it needs to have some sort of drum that's mounted to the motor shaft to wrap the string around. Although I'm unable to find anything suitable that I could use. Is there already something that exists that could work for this, if so how would I go about attaching it to the motor shaft? Here are a few images of the motor:

(Motor Specifications: 12v DC 15 kg.cm)
Any suggestions?

Thanks.

 

[jrmichler]

Maybe something like this?

From McMaster-Carr (www.mcmaster.com). You would need to get one for a 3/16" shaft and drill it out to 5.5 mm. Substitute a socket head cap screw for one of the setscrews, then tie the string to it. McMaster-Carr is a good place to browse around looking for ideas.

 

[TechTree]

Thanks for your reply!

Substitute a socket head cap screw for one of the setscrews, then tie the string to it.

I'm just slightly confused, which part of the pulley the string should be attached to? If it's connected to one of the screws how will it warp around the pulley?

Thanks.

 

[anorlunda]

Thanks for your reply!

I'm just slightly confused, which part of the pulley the string should be attached to? If it's connected to one of the screws how will it warp around the pulley?

Sometimes the shaft is slotted, so you can stick the end of the string in the slot. Otherwise, I would tie it around the drum with a constrictor knot.
https://en.wikipedia.org/wiki/Constrictor_knot

 

[berkeman]

it needs to have some sort of drum that's mounted to the motor shaft to wrap the string around.

When wrapping string or cable around a drum, it can be important to have a guide mechanism that moves back and forth to ensure that the wraps are even (to get the most string or cable on the drum that can fit). Without a moving guide, the wraps can become a mess and even bind.

Maybe look at the different kinds of fishing reels to see if you can adapt one of them for what you want to do. You can find relatively inexpensive ones and even used ones. They generally will have a moving guide mechanism, since the fishing line needs to be reeled up neatly time after time without extra effort by the person doing the fishing:

http://www.reeladventurefishing.com/8-types-fishing-reels-most-commonly-used/

 

[CWatters]

(Motor Specifications: 12v DC 15 kg.cm)

Is that the stall torque after the gearbox? If so the drum will need to be Les than 3cm radius.

 

[TechTree]

Maybe look at the different kinds of fishing reels to see if you can adapt one of them for what you want to do.

A fishing reel! That's a great idea berkeman thank you for your suggestion! I'm sure I can adapt one to work for my project.

 

[Baluncore]

When you wind a filament onto a winch drum, the filament is wound on with a tension due to the supported load. 5Kg might seem to be very little tension, but call it a force of 5 * 9.8 = 50 Newton. Now wind on 100 turns and you have a combined circumferential hoop stress of 100 * 50 N = 5 kN. That may be sufficient to crush the drum. The wall of the drum is in compression and must be sufficiently thick to oppose that winding stress without collapse.
How many turns of filament can you wind onto your drum?

 

[Lynda Jhon]

Are you going to use the gearbox motor for fishing reels?

 

[TechTree]

Are you going to use the gearbox motor for fishing reels?

Yes, I'm going to try and use the gearbox motor to wrap the line around a fishing reel. Then use a pulley to lift the box.