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Wooden Ruler, Graduated with a Caliper
A ruler is only as good as its marks. Here every mark is measured from the ruler's own end with a digital caliper, so errors do not add up as they would by stepping off one centimetre after another. A 150 mm caliper marks the first half; the second half is measured from the far end. Straight-grained hardwood stays straight.
Beginner
2 hours
Instructions
1
1
Plane the blank
Plane the blank
Plane a straight-grained hardwood strip to about 310 x 30 x 5 mm, with one long edge dead straight and the ends square.
Materials for this step:
Hardwood Strip1 pieceTools needed:
Block Plane
Straightedge
Try Square
Bench Vise2
2
Mark from the left end
Mark from the left end
Set the caliper to each length from 0 to 150 mm and, with its fixed jaw on the ruler's left end, nick the edge at the moving jaw with the marking knife.
Tools needed:
Digital Caliper 6-Inch
Marking Knife3
3
Mark from the right end
Mark from the right end
Cut the blank to exactly 300 mm, then mark 150 to 300 by measuring from the right end in the same way.
Tools needed:
Digital Caliper 6-InchMarking KnifeTry Square4
4
Knife the lines
Knife the lines
Square each nick across with the try square and knife: short lines for mm, medium for 5, long for 10.
Tools needed:
Try SquareMarking Knife5
5
Finish
Finish
Sand lightly and wipe on linseed oil; the oil darkens the knife lines so they read clearly.
Materials for this step:
Linseed Oil10 mlTools needed:
Sandpaper Sheet6
6
Check it
Check it
Measure across several marks with the caliper; note the largest error on the back.
Tools needed:
Digital Caliper 6-InchMaterials
2- 1 piecePlaceholder
- 10 mlPlaceholder
Tools Required
7- Placeholder
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