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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.
初学者
2 hours
说明
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.
此步骤所需材料：
硬木条1 个所需工具：
短刨
直尺规
固定角尺
台虎钳2
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.
所需工具：
6 英寸数显卡尺
划线刀3
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.
所需工具：
6 英寸数显卡尺划线刀固定角尺4
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.
所需工具：
固定角尺划线刀5
5
Finish
Finish
Sand lightly and wipe on linseed oil; the oil darkens the knife lines so they read clearly.
此步骤所需材料：
亚麻籽油10 毫升所需工具：
砂纸6
6
Check it
Check it
Measure across several marks with the caliper; note the largest error on the back.
所需工具：
6 英寸数显卡尺此蓝图制作
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