Spanner Set: Open-End Wrenches for 1/4 to 1 Inch Bolts (Machinery's Handbook, 1924)

A set of open-end spanners made to the standard dimensions in Machinery's Handbook. The jaw opening fits the nut of each bolt size, and head width, head thickness and length grow with it, so each spanner is strong enough for its own nut. Variable: the bolt size. The table gives each spanner's dimensions from 1/4 in up to 3 1/2 in bolts; this set covers 1/4 to 1 in. Source: Machinery's Handbook (1924), p. 848, Dimensions of Wrenches. Unknown: the steel and its hardening. Picture: the Handbook's page.

中级

Unknown

说明

Pick the sizes

For each bolt size, the Handbook gives jaw opening A, head width B, head thickness H and overall length L, in inches. 1/4 in bolt: 1/2, 1, 1/4, 5 1/2. 5/16: 19/32, 1 3/16, 5/16, 6. 3/8: 11/16, 1 3/8, 3/8, 7. 7/16: 25/32, 1 9/16, 7/16, 8. 1/2: 7/8, 1 3/4, 1/2, 9. 9/16: 31/32, 1 15/16, 9/16, 10. 5/8: 1 1/16, 2 1/8, 5/8, 11. 3/4: 1 1/4, 2 1/2, 11/16, 12 1/2. 7/8: 1 7/16, 2 15/16, 3/4, 14 1/2. 1 in: 1 5/8, 3 5/16, 7/8, 16 1/2. The neck and handle sizes are in the same table. Ours: a set of these ten.

所需工具：

千分尺

Forge the blanks

Forge each spanner from bar: a round head as wide as B and as thick as H, a neck, and a handle to make the overall length L. Ours: carbon steel bar forged under a power hammer. Not given: the steel, the forging method.

此步骤所需材料：

碳素钢棒（0.6 % C）10 ten spanners

所需工具：

锻炉

机械锤

铁砧

Cut the jaws and harden

Cut the open jaw in each head to the opening A, so it fits across the flats of that bolt's nut, and finish the faces parallel. Check each opening. Harden and temper the spanners. Not given: the hardening.

所需工具：