Vernier bevel protractor - Goniometer | Rapporteur | Winkelmesser

What it is

A compact tool to determine angles. It also includes a 120 mm linear scale and ring gauges from 1 to 9 mm in 1mm increments (clearance designed is 0.1 mm).

What to print

There are three parts awaiting you, which can be printed with raised or depressed digits & scales.

1. upper part
   • 360° scale
2. lower part variant 1
   • 1° vernier scale
   • collinear linear scales = 180°
   • one leg
3. lower part variant 2
   • 1° vernier scale
   • collinear linear scales = 0°
   • two legs

How to print

The digits and lines are designed with a stroke width of 0.6 mm. Recommended for printing is a 0.2 mm layer height. Printing with a 0.6mm nozzle and Arachne activated in PrusaSlicer is possible, as can be seen in the pictures above. A 0.4mm nozzle may yield better results though.

A multi color version is just a matter of filament swaps.  → In case the digits won't print neatly after a filament change: A draft shield, wipe tower or any object to consume filament beforehand (establishing good flow by doing so) may help.

Material at one's discretion, I used PETG in two different colors. Assembly works by simply clipping the parts together after printing. It should feel firm, move without any noticeable play and hold any angle on its own. → If it does not, please report back (including information about the used material and what clearance your system usually achieves).

Usage

The resolution is 1°. Precision beyond that would in theory be possible with a finer vernier scale. I tried that as FFF-part but wasn't satisfied with the result (which may be entirely due to my printing setup). Diameter of the round part is 28mm inside (0.1mm clearance designed) and 60mm outside.

The linear scales can be used to determine any length up to 120 mm, especially handy when measuring facets.

What next

There may be improvements and modifications based on feedback given here. The current font used is OCR-B. The quest for the best printable fonts is not over, just further elaborated here.

If radius/diameter measuring tools may also be useful to you, consider my workshop coaster, radii worm or diameter chain. Efficient identification of metric nuts & bolts can be done with my cylindrical screw measuring tool.

Mentions

The foundations for this design were laid by Pierre Vernier & Pedro Nunes a few hundred years ago.

Updates

• Second variant added [2022-Nov-29]
• Finally the  variants with depressed digits & scales are ready and added. A shout-out goes to Ziemniaczenka who also saw the demand and made a remix. [2022-12-25]