Hand-Cranked Worm Gear Driven Large Marble Dispenser

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Project by DaleMaley posted 09-10-2021 11:59 AM 919 views 1 time favorited 7 comments Add to Favorites Watch

I made a direct drive version of this and it was ok except you can dispense all 6 marbles in less than 6 seconds…..which is very fast.

If I use a worm gear drive, I can slow it down so it takes longer to dispense all 6 marbles. About 4 seconds per marble would be about right, which is 15 RPM. Since kids can crank up to 100 RPM, the worm gear needs a speed reduction ration of 100/15 of 6.7.

Since the worm gear speed reduction ratio is determined by the number of teeth on the worm gear, using 7 or 8 teeth should be ok….....I chose to go with 8 teeth on the spur gear. It takes about 29 sec on the actual model, cranking it at 100 RPM, to dispense all 6 marbles.

The model is made of maple parts, except the worm gear and crank handle are made from a 1.25” diameter birch dowel. I used water based red dye on the worm gear and crank handle.

You can use this link to watch a Youtube video of this model in action.

For more details, see my woodworking web site.

I think the grand-kids will have fun with this one.

-- Dale, Illinois,

7 comments so far

View Redoak49's profile


5395 posts in 3235 days

#1 posted 09-10-2021 02:44 PM

Very interesting !

View Eric's profile


1959 posts in 1119 days

#2 posted 09-10-2021 10:36 PM

Very neat project.

-- Eric, building the dream

View swirt's profile


6645 posts in 4218 days

#3 posted 09-11-2021 01:39 AM

These things you make are awesome

-- Galootish log blog,

View  woodshaver Tony C   's profile

woodshaver Tony C

8298 posts in 4599 days

#4 posted 09-11-2021 02:44 AM

Cool little marble dispenser machine!

-- St Augustine FL, Experience is the sum of our mistakes!

View htl's profile


5578 posts in 2405 days

#5 posted 09-11-2021 09:53 PM

Just have to love all the contraptions you have built and shown us.
Keep up the great work!!!

-- An Index Of My Model making Blogs

View mikeacg's profile


2038 posts in 2303 days

#6 posted 09-12-2021 12:20 PM

Fun stuff – and I really like your videos!


-- Mike, A Yooper with a drawl,

View DaleMaley's profile


591 posts in 3482 days

#7 posted 09-13-2021 11:11 AM

Fun stuff – and I really like your videos!


- mikeacg


Recently I switched to using my Samsung S8 cell phone to make my videos, versus my 2006 Canon Powershot A610, and the cell phone makes sharper, crisper videos… I added some lighting on this one which helped a lot.

You can use this link to watch more of my videos about the wood toys I have made.

thanks again

-- Dale, Illinois,

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