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Printed Protractor on Pasteboard
A protractor is a half circle divided into 180 degrees. Drawn in millimetres on an A4 page with an 80 mm radius, every degree mark is about 1.4 mm apart, enough to read to a degree. Printed at actual size and glued to stiff pasteboard, it measures as well as a shop one for paper and wood work. A 100 mm check line on the sheet catches a printer that shrinks the page.
Download: /uploads/blueprints/protractor-a4-180.pdf
Beginner
45 minutes
Instructions
1
1
Print at actual size
Print at actual size
Download /uploads/blueprints/protractor-a4-180.pdf and print it with 'Actual size' (100 %), never 'Fit to page'. Measure the check line: it must be 100 mm.
Materials for this step:
Paper1 sheetTools needed:
Desktop Computer
Inkjet Printer
Ruler2
2
Why actual size matters
Why actual size matters
Printing a measuring sheet so it stays true.
3
3
Glue to pasteboard
Glue to pasteboard
Brush warm hide glue thinly over a piece of pasteboard, lay the print on it, smooth it from the middle out and press it flat under a weight until dry.
Materials for this step:
Pasteboard1 sheet
Hide Glue10 gTools needed:
Double Boiler
Hot Plate
Glue Brush
Weight4
4
Cut it out
Cut it out
On the cutting mat, cut along the straight baseline exactly and round the arc a few millimetres outside the marks.
Tools needed:
Craft Knife
Self-Healing Cutting MatRuler5
5
Check it
Check it
Measure the baseline from the 0° mark to the 180° mark through the centre cross: it should be 160 mm. Check that 90° stands square to the baseline.
Tools needed:
RulerThis blueprint makes
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