Mallory Uni-lite Degree Key (YL Series)
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Used for setting timing advance on YL series Mallory Uni-lite distributors anywhere from 16° to 28°.
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- Creative Commons — Attribution — Noncommercial — Share Alike
The original tool known as the “degree key” that was provided in tuning kits for the Uni-lite distributors has long been unobtainium for anyone interested in adjusting their spark advance.
Original Key Pictured:
The measurements, however, for the thickness of the gauge required for each advance setting are still out there. Using this, I reconstructed a version of the original key (OEM Style) from these measurements and from the few images of the tool I could still find online in CAD. I also created an updated version (Printer Friendly) that is reoriented better for more accuracy when 3D printed. I would highly recommend using the Printer Friendly version as the OEM style will suffer from inaccuracy with a 0.4mm nozzle. My intent was to make this tool available to anyone out there in need for free after I originally made one for my dad who needed one for one of his projects. I have included both .stl and .step files for those who might want to alter some things about the design or just use the original version. You are free to share this design or remix it in any way you please as long as you give proper credit.
Here are the measurements I used (keep in mind that my CAD files were made using inches as my units as this may be important when you slice the files for printing if your slicer does not pick this up. It may require you to scale it up to be the equivalent in mm.):
16 degrees = .390 in
18 degrees = .405 in
20 degrees = .423 in
22 degrees = .443 in
24 degrees = .462 in
26 degrees = .480 in
28 degrees = .500 in
Total Tool Length: 3.60 in
Gauge Step Length: 0.375 in
Key Width: 0.230 in
My specific settings I used when printing:
Style: Printer Friendly
Printer: Bambulab P1S
Layer Height: 0.12mm (the smaller, the more accurate the gauge thickness on the Printer Friendly version)
Nozzle Size: 0.4mm (smaller nozzle size would be better for the OEM Style version for improved accuracy)
Infill: 25%
Supports: None (No supports needed for the current orientation of either model)
I measured the result of my print and the thickness measurements were accurate to +- 1/1000 of an inch at the most which is pretty damn good if you ask me (some were even spot on down to 1/10000 of an inch).