ART
BEAUTY & WELLNESS
CRAFT
CULTURE & HISTORY
ENTERTAINMENT
ENVIRONMENT
FOOD & DRINKS
REVERSE ENGINEERING
SCIENCES
SPORTS
TECHNOLOGY
WEARABLES
Boring Bar: Driven Between Centres, with a Set-Screw Cutter (Yates, 1922)
A home-made boring bar for holes too long for an ordinary boring tool, which would spring. A short, stiff bar runs between the lathe centres, driven by a dog, and carries a hardened tool-steel cutter locked in a cross-hole by a set screw. The work is bolted to the lathe carriage and fed past the turning cutter.
Result: a boring bar, plus the small short-cut bar of Fig. 110.
Source: R. F. Yates, Lathe Work for Beginners (1922), pp. 134-136. Unknown: bar diameter and set-screw size. Picture: Figs. 110-111 of the book.
Intermediate
Unknown
Instructions
1
1
Turn the bar
Turn the bar
Turn a bar no longer than the job needs; the shorter it is, the less it twists under the cut. Drill both ends for the lathe centres. For short cuts, the small bar of Fig. 110 is 4 to 6 inches long with a round shank and a squared end. Ours: mild steel round bar. Not given: the diameter.
Materials for this step:
Mild Steel Round Bar1 boring barTools needed:
Metal Lathe
Unknown Dimensions2
2
Fit the cutter and set screw
Fit the cutter and set screw
Drill a cross-hole through the bar for the cutter and drill and tap a hole into it for a set screw that locks the cutter. Make the cutter of tool steel, grind its point with proper clearance, and harden it.
Materials for this step:
Square Tool Steel Bar1 cutter
Unknown Metal1 set screwTools needed:
Drill Press
Tap and Die Set
Grindstone
Heat Treating Oven
Quench Bucket3
3
Bore with it
Bore with it
Bolt the work down to the lathe carriage carefully and securely; carriage bolts of several sizes are handy for this. Drive the bar between centres with a dog and feed the carriage. Run very slowly when boring cast iron, and keep the feed light so the bar does not spring.
Tools needed:
Metal Lathe
Carriage BoltMaterials
3- 1 boring barPlaceholder
- 1 cutterPlaceholder
- 1 set screwPlaceholder
Tools Required
8- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Connected Blueprint Materials
10% Attribution
Mild Steel Bar Stock Forged from an Ingot
by Forge
Modern
42
0
0
0
5
0
10% Attribution
Tool-Steel Bar: Crucible Steel Drawn Out at a Cherry-Red Heat
by Forge
Blacksmith
30
0
0
0
5
0
10% Attribution
Lathe Cutting Tool: Ground to the Clearance and Slope for Each Metal (Machinery's Handbook, 1924)
by Forge
Metalworking Tools
0
0
0
0
1
0
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.