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Two-Point Marking Gauge from a Pipe Tee and Wing Bolt (Boy Mechanic, 1915)
A small scribing gauge built in a 3/8 in pipe tee: two flat steel bars with bent, sharpened points slide through a slot in a wood plug filling the tee, and a wing bolt screwed through a bushing in the side outlet locks them at the set distance.
Intermediate
Two hours
Instructions
1
1
Read the Boy Mechanic
Read the Boy Mechanic
"After the points have been drawn out to the right distance, the wing bolt is turned to hold them in that position."
2
2
Tee and bushing
Tee and bushing
Screw a 3/8 in bushing into the side outlet of a 3/8 in pipe tee and tap the bushing to take a 7/16 in wing bolt.
Materials for this step:
Threaded Pipe Fitting1 piece
Metal Bushing1 pieceTools needed:
Tap and Die Set
Bench Vise3
3
Plug and slot
Plug and slot
Drive a tight-fitting wood plug through the run of the tee, grind its ends flush on an emery wheel, and cut a slot 5/16 in square through the plug just under the bushing.
Materials for this step:
Hardwood Board1 pieceTools needed:
Grinding Wheel
Chisels
Hand Saw4
4
Make the points
Make the points
Cut two pieces of flat steel 1/4 in wide, 1/8 in thick and 1/8 in longer than the tee. Bend the outer end of each at right angles and sharpen it to a point. Fit both in the slot, one from each side.
Materials for this step:
Mild Steel Flat Bar1 pieceTools needed:
HacksawBench Vise
Files (Hand File)
Hammer5
5
Set and lock
Set and lock
Draw the points out to the distance you want and turn the wing bolt down onto the bars to hold them.
6
6
Troubleshooting
Troubleshooting
Pipe-tee gauge troubleshooting.
Flow
Loading...
7
7
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 2** (Popular Mechanics, 1915), p. 294, by C. Molloy (checked on the archive.org scan boymechanicbook200chic2). The tool list is ours.
Materials
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