ART
BEAUTY & WELLNESS
CRAFT
CULTURE & HISTORY
ENTERTAINMENT
ENVIRONMENT
FOOD & DRINKS
REVERSE ENGINEERING
SCIENCES
SPORTS
TECHNOLOGY
WEARABLES
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.
Intermediate
Unknown
Instructions
1
1
Pick the sizes
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.
Tools needed:
Micrometer2
2
Forge the blanks
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.
Materials for this step:
Carbon Steel Bar (0.6% C)10 ten spannersTools needed:
Forge
Power Hammer
Anvil3
3
Cut the jaws and harden
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.
Tools needed:
Milling Machine
Metal FileMicrometer
Heat Treating Oven
Quench BucketMaterials
1- 10 ten spannersPlaceholder
Tools Required
8- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
This blueprint makes
CC0 Public Domain
This blueprint is released under CC0. You are free to copy, modify, distribute, and use this work for any purpose, without asking permission.
Support the Maker by purchasing products through their Blueprint where they earn a Maker Commission set by Vendors, or create a new iteration of this Blueprint and include it as a connection in your own Blueprint to share revenue.