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Hand-Cranked wood model of Scissors Lift Platform

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Project by DaleMaley posted 11-16-2020 06:42 PM 923 views 1 time favorited 6 comments Add to Favorites Watch

I like to convert mechanisms to hand-cranked wood models for kids to learn and play with. Before the virus, I would take my 50+ wood models to public shows several times a year and often the adults had as much fun as the kids.

The challenge for me on this project was making the wood threads on the block that drives the scissors. In the early 80s I bought a 3/4” inch Conover threading kit with a tap and die block. Back in the 80s I failed miserably trying to cut threads and put the kit away in storage.

A few weeks ago I went to YouTube and found a very interesting video where the guy was making 2.5 inch diameter threads in Maple. He said there were 2 secrets to making external wood threads. Number 1 secret was soaking the maple in Mineral Oil for 6 days before threading. The 2nd secret was using coconut oil as a lubricating oil to better remove the chips. Here is a link to that Youtube video.

So I special ordered some 3/4” maple dowels, and soaked them 7 days in mineral oil. I glued a cap onto a piece of 1.5 inch diameter PVC and made a wood base to hold it upright.

Interesting story on my 1 gallon of Mineral Oil. A couple years ago I went to a Farm & Fleet store to buy some Mineral Oil. I went to the paint department, the lady working there said there was none in the paint department, but she used to work in the livestock department, and she took me over there and I found 1 gallon jugs….....labelled to be used as a cow laxative :)

Before threading, I pulled out the V-shaped steel cutter from the threading block…....and after 38 years in storage, there was some rust on the 2 shiny parts of the cutter…...imagine that :) I used the honing stone that came with the kit, plus some honing oil, to lap or sharpen the blade.

I was finally able to make perfect external threads, as shown in the photo with the No. 2 pencil.

I did not use coconut oil while threading. I brushed on mineral oil as I cut the thread, and the curly chips came out nicely from the wood threader box. Maybe the big chips from 2.5 inch threads benefit more from the coconut oil.

I made a YouTube video of the model in action. You can see the model in action using this link.

This was a fun, but challenging project.

To see all the details of how I designed and built this model, see my woodworking web site using this link.

Thanks :)

-- Dale, Illinois, http://dalemaley.webs.com/





6 comments so far

View woodbutcherbynight's profile

woodbutcherbynight

10661 posts in 3751 days


#1 posted 11-16-2020 09:33 PM

That is awesome

-- Live to tell the stories, they sound better that way.

View DaleMaley's profile

DaleMaley

594 posts in 3578 days


#2 posted 11-16-2020 10:20 PM



That is awesome

- woodbutcherbynight

Thanks !!

There were plenty of learning experiences designing and building that model :)

-- Dale, Illinois, http://dalemaley.webs.com/

View swirt's profile

swirt

7141 posts in 4314 days


#3 posted 11-17-2020 01:29 AM

You make such fun looking machines. Well done.

-- Galootish log blog, http://www.timberframe-tools.com

View crowie's profile

crowie

5262 posts in 3293 days


#4 posted 11-24-2020 04:40 AM

Very clever sir and a whole heap of work!

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View htl's profile

htl

5616 posts in 2502 days


#5 posted 11-25-2020 06:00 PM

How did I miss this cool project!!!
Well done!!!

-- An Index Of My Model making Blogs https://www.lumberjocks.com/htl/blog/130264

View DaleMaley's profile

DaleMaley

594 posts in 3578 days


#6 posted 11-25-2020 06:07 PM



How did I miss this cool project!!!
Well done!!!

- htl

Thanks! Figuring out to make the wood threads was the most challenging part of the project :)

-- Dale, Illinois, http://dalemaley.webs.com/

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