Science Olympiad FLIGHT: Rubber Band Winders 1:10, 1:15, 1:20 3D Printer Model Free Download

Description Files (30)

Summary

Update 10/13/2024: I built another set of winders for this year's high-torque helicopter event. Compiled a video to help other students build their own. Posted at https://youtu.be/muXGH8JvJ2A. Cheers!

INTRO

Although my previous <a href="https://www.thingiverse.comrugged">https://www.thingiverse.com/thing:5425305">rugged 1:15 winder</a> worked very well in many students' hands, the multiplier, 1:15, is not intuitive. Many people count the number of cranking instead of the true number of winds on the rubber band. Besides, many indoor flight reference papers on the Internet need the true number of winds to interpret the performance of rubber band. Multiplying number of cranking by 15 may take a bit of brain exercise. So, instead of asking students to do complex multiplication, here you may find the 1:10 or 1:20 winders. These two extra ratios should help translate the number of cranking to the true number of winds easily. Cheers!

Check out my other designs, e.g. <a href="https://www.thingiverse.comPrecise">https://www.thingiverse.com/thing:5641994">Precise Propeller Mold</a>, <a href="https://www.thingiverse.comPitch">https://www.thingiverse.com/thing:5163114">Pitch Gauge</a>, <a href="https://www.thingiverse.comHobby">https://www.thingiverse.com/thing:5741469">Hobby Clamp</a>, <a href="https://www.thingiverse.comBalsa">https://www.thingiverse.com/thing:5235452">Balsa Stripper</a>, etc. at https://www.thingiverse.com/aeromartin/designs. Hope you LIKE them, too.

-AeroMartin

BOM

1x M3x12mm Screw with two washers for securing knob.
2x M2.3x5 tapper screws for securing crank to main gear.
5x M2.3x8 tapper screws for fastening faceplate.
1.8mm x 38mm piano wire for the first gear axis.
1.8mm x 15mm piano wire for the second gear axis.
1.2mm x ~130mm piano wire for final gear's axis & output hook

Printing & Assembling Notes:

PLA+, 0.2mm layer, 100% infill, No support needed
Calibrate 'flow' and correct 'elephant foot' issue before starting. (I set "Initial Layer Horizontal Expansion" to -0.2mm in Cura to compensate elephant foot.)
(Check photos), For the output Gear3, bend two "L" shape 1.2mm wires to fit. Then glue a small piece of printout to secure. Cut the two wires to length afterwards.
Lubricate gears well. (Vaseline or DuPont Dry-Film lubricant aerosol works well.)

Instruction for adapting a small tally counter:

The cute tally counter is available at many places, e.g.
https://www.amazon.com/dp/B09WYQXLWW
Disassemble the tally counter by unscrewing two screws on the back.
Attach the working half of the tally counter to the adapter. Before putting the cranker on, attach the counter assembly to the faceplate on the winder
See photo. Measure the distance between the counter face and the winder crank. Dry fit one of the three clappers on the crank to test. By design, 5.4mm one should work. If need to, you may scrap off the ridge on the clapper to reduce the height a bit. Glue the clapper to crank when all checks out.

110Adapter.stl	2.9MB
110Case.stl	2.4MB
110Clappers.stl	341.9KB
110Crank.stl	97.6KB
110FacePlate.stl	1.8MB
110Gear1.stl	909.0KB
110Gear2.stl	893.4KB
110Gear3.stl	432.0KB
110Knob.stl	55.6KB
110Output.stl	173.3KB
115Adapter.stl	2.9MB
115Case.stl	2.4MB
115Clappers.stl	342.1KB
115Crank.stl	97.6KB
115FacePlate.stl	1.8MB
115Gear1.stl	855.6KB
115Gear2.stl	952.8KB
115Gear3.stl	308.8KB
115Knob.stl	55.6KB
115Output.stl	173.1KB
120Adapter.stl	2.9MB
120Case.stl	2.4MB
120Clappers.stl	342.2KB
120Crank.stl	97.6KB
120FacePlate.stl	1.8MB
120Gear1.stl	909.0KB
120Gear2.stl	1.1MB
120Gear3.stl	335.4KB
120Knob.stl	55.6KB
120Output.stl	173.5KB

Science Olympiad FLIGHT: Rubber Band Winders 1:10, 1:15, 1:20 3D Printer Model

Summary

Tags

You might also like