#2 Pyramid Roller Ball Mechanism using Square Hole shaft method

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Project by DaleMaley posted 04-11-2021 07:07 PM 712 views 2 times favorited 2 comments Add to Favorites Watch

I made this first one of these last week, And I was not happy with how straight my 3 axle holes were, which impacted how well the wood balls rotated when you crank it. I posted this project on this web site, you can use this link to see it.

When I was doing a previous project, I ran across a method of making long and straight holes in wood. The method is at least as old as the early 1900s, when lamp makers cut a square groove in 2 mating pieces, glued them together, lathe turned them into lamp bases, then ran the electrical wire down the center hole.

I decided to make a 2nd unit using the square hole method, and see if the balls rotated better with improved ball axles. I made a short YouTube video of this method. You can use this link to watch that video.

I was very pleased with the square hole method, and the balls do rotate better on Unit #2. Here is a link to a short video on Unit #2 being cranked.

You can see this project on my woodworking web site using this link.

I’m going to use the square hole method on the next project where I need a long and straight hole with a high L/D or Length/Diameter ratio.


-- Dale, Illinois,

2 comments so far

View Madmark2's profile


2660 posts in 1672 days

#1 posted 04-11-2021 07:51 PM


-- The hump with the stump and the pump!

View Eric's profile


1367 posts in 957 days

#2 posted 04-12-2021 12:15 AM

Neat project, bet the kids love it, or grandkids. Great job

-- Eric, building the dream

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