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Dale C. Maley............May of 2021
The Dec/Jan 2017 issue of Woodcraft Magazine has an article on building a neat lamp, called the Dynamo Men Lamp......
I ordered the parts kit, and will build this one after I receive the parts............below is the receipt for the parts kit........
I don't have a nearby source for Baltic Birch plywood, so I ordered online from Rockler.........
Improving the design plan from the magazine
I almost always put a design into Google Sketchup. It familiarizes me with the project design, and there is usually at least one error in every magazine plan.
I input this design into Sketchup. I found the bottom RH shaft hole was just too close to the RH edge of boards. I added a 1/4" onto the width of all the appropriate boards to give a little bit of clearance for the 3/16" drilled hole.
My improved design is shown below...........
At this point, I am still waiting for the Baltic Birch to arrive. I am going to go ahead and make the major base pieces shown above. I now have the parts kit and can install the motor and other electrical items.
I am probably going to make the very back piece removable, to allow access to the electrical items on this project.
I am going to make the base pieces out of maple from Menards.
Assembly of Box
Somehow you have to glue the 4 pieces that are 1-7/8" wide to the biggest front piece. I chose to set the big front plate upside down on my workbench, then glue and clamp the pieces to the front piece. This worked basically ok. But the last step is to fit the back piece into this box. I think I will try using carbon paper to mark the exact outline of the back of the box, then cut the back piece to fit..........to try to get the best fit.
1st I tried putting a blank piece of white paper on the back, then the carbon paper. I tried to mark the edges with a pencil. This did not work, there was not a distinct line. I then used the butt end of a small screwdriver and rubbed along the edges. This worked great and gave distinct lines.
Checking the assembly fit-up
I chose to use purple heart for the men's lower body, then yellow-heart for the upper portion of one man, and padauk for the upper portion of the other guy. It should be colorful when done!
2 support pieces for back cover
The magazine plan does not give any method for holding the back cover in place. I chose to add 2 pieces of 3/8x3/8" maple and super-glue in place. I may add a couple of screws later.
1/8" Round-Over radius using the router
I rounded over the edges of the box on the front and the back. I also rounded the edges on the front face piece.
Clamping front and middle pieces
Clamping box to base
Drilling hole for light fixture
Problems with square drive
The magazine said to keep the little pin on with a dab of super-glue. This did not work at all. In my cotter pin set, the smallest one just fit the hole fine!!
Trying out the Assembly
After getting everything assembled, I had to try out the motion.........see the video below:
Luan versus Baltic Birch Plywood
Since I was waiting on my order of Baltic Birch to arrive, I went and and glued up two thicknesses, of 3/16" thick Luan, and made the gears from them. The final thickness was 3/8" versus the 1/4" in the plan, but I figured it would work. When the baltic birch arrived, I used it to make the 4 spacers each 1/4" thick.
I really don't see any difference between the 2 materials. If your design can handle multiples of 3/16", then Luan should work. If you need multiples of 1/4", then 1/4" thick baltic birch works. I prefer Luan because it is cheap, and is available in 4x8 ft sheets at Lowes :)
Progress so Far
The model functioned pretty well before varnishing. The lower RH gear center is a little far away from the big gear, but it still functions.
I initially glued on the front pedestal, and the Dynamo man on the RH side to the base.......but then I found out I could not remove the bolt that holds in the lower RH gear.....the bolt hits the Dynamo man :( So, I was able to unglue it, then use 2 screws from the bottom to attach it........and it is removable from now on.
On the gears, I used a light oak stain, followed by 2 coats of clear satin poly. My clear satin poly has some brown color on it, so I did not want to use that on the colored men or maple.....so I used clear gloss instead on those parts. I used 10 minutes round in the oven at 120F to cure the poly quicker. If you leave it longer than 10 minutes, the poly starts to bubble.
Special Light Bulb
I went ahead and bought the special light bulb, with a mirror on the top half, from Amazon.......
I made a Youtube video showing the model in action.............
Closing Thoughts on this Project
This was a fun project to build. You should screw the RH man to the base, versus gluing it down, so you can get the lower RH gear bolt in and out of the main body. I made the main body a 1/4" wider to give some more clearance for the lower RH gear bolt.
I don't remember who sent it to me, but another woodworker that built the model, had trouble getting the gear drive to work ok.
Now that my model has sat for over 1 year unused, I fired it back up, and the electric motor wants to stop, then change rotation direction..........run a little while........then stop and change direction again. I assume there is too much friction in the model. I found a little binding on the LH man because of the spacers on the inside of the drive bolt. I removed the little wood ball, and used some metal washers.
I also rounded all the gear teeth, versus a rectangular edge. I applied Johnson Wax to the gear.
Now it runs without changing direction, but the motor movement is jerky?? I think the motor does not have enough power for the model. The motor info is........
Kingston 120VAC 3.5W
F130 Class B
I googled it, but could not an exact replacement.........nor could I find if Kingston offers a motor with more power.
I crudely timed the main gear, it took about 3 seconds to make 1 rev.............so this is about a 20 RPM motor.
I went on Amazon, and they do sell some 4w, 20 RPM motors. If I get one, the drive shaft connection will probably be different, and so will the mounting method. I guess for now I will live with the jerky motion. If I was doing this model over, I would probably first get a stronger motor, then revise the wood design to match the new motor.
I found 1 tooth that was a little long and creating some binding..........Dremel sanded it down..........seems to work ok now. I made a video of it working ok now. With this small motor, there is no margin for error on the gear engagement!!