Instructables

Geared Candleholder

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Picture of Geared Candleholder
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This project is a candleholder with three gears and parallel action arms which move the candles up and down at different rates.It is made from aluminum plate and uses tea lights or small floating candles. The design and the variable gearing make it a playful device.
 
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Step 1: Marking and cutting the Gears

Picture of Marking and cutting the Gears
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I make gears basically by drilling holes in a circle, and then cutting away excess material so that the holes become the "valleys" between teeth. The diameter of the circle that passes through the center of each tooth (the Pitch Circle), is calculated by the formula shown below.

Also note the additional holes marked "#25". These are mounting holes for the connecting rods that join to the parallel arms. They need to be drilled with a #25 drill bit, and then tapped with a 10-24 tap to accept the shoulder bolts that act as pivots for the connecting arms.

Step 2: Cutting the Chassis Plates

Picture of Cutting the Chassis Plates
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The front and back plates of the chassis are cut from 1/4" aluminum plate. Use the chart below to mark out the back plate, then use the back plate to mark up the front plate (remember the front plate does not have holes for the gears, so it can be much smaller and simpler.

Step 3: The feet and knob

Picture of The feet and knob
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The feet are cut from 7/8" diameter aluminum rod. I cut slots in the rods to fit the front and back plates of the chassis into. During final assembly, you will epoxy the feet in place.

The knob can be any shape, but I made it in a similar shape as the gears. It needs a center hole, 1/4" dia., and a 1/4" shaft collar joined to the knob with a tension pin (see photos). 
Edgar1 year ago
Nice!
The gearwheel making part will be used by thousands of Gizmo Makers, now:
http://faz-voce-mesmo.blogspot.pt/2013/03/acendedor-de-churrascada-electricidade.html
alvin_lee1 year ago
It's amazing to see how you make gears without CNC or the gearing cutters of some sort. It's just amazing! You are the pro, man!
jimwi1 year ago
Benjamin it is nice to see someone using there hand to make things and develop there skills instead of cutting all the pieces out on a CNC mill or laser cutter. You do very nice work. Thanks for shearing. JIM
action pig1 year ago
Loved it. Would love to see a video!!!
+1
ditto
foobear1 year ago
How did you come up with the overall mechanism? I am fascinated by kinematics and intend to learn about it one of these days
Sam DeRose1 year ago
wow this is amazing. awesome work!
can you post a video of the movement?
This looks really familiar.
l8nite1 year ago
it's a great mechanical sculpture, it would be over the top if it was motorized
Brilliant work, Benjamin! Thanks for sharing.
Sweetest candleholder!
luridhue1 year ago
Incredibly beautiful. I'd love to see a video of the motion when turning the knob. I am impressed that it is all cut/finished by hand, on first glance I presumed it was CNC milled or the like and beyond what I am able to make through lack of a mill, I have a lot of brass plate sitting around and will have to give this a go. Thanks :D