Milling the “tailstock” on a motor-driven vertical milling machine. A natural mechanic (one out of every fifteen that apply can be classed as such), 14 years old. Has been an apprentice about four months. Is doing work usually done by boys of eighteen months’ experience.
BOARDMAN APPRENTICE SCHOOL, NEW HAVEN.
Boring is an advanced branch of the machine trade, and requires great skill to successfully complete an accurate piece of work.
A boy must complete 4,000 hours before he is advanced to this operation, and not then unless we consider him competent to do this accurate work.
The “head” and “tail” of this machine must “line” to .001 of an inch in 18 inches, and therefore must be bored until all the “spring” is out of the boring bar.
This boy, age 15, is making a measurement with a spring caliper to ascertain proper size before reaming.
BOARDMAN APPRENTICE SCHOOL, NEW HAVEN.
Scraping beds—a difficult art. Notice the standard Brown & Sharpe surface plate at the left. The surface of these beds must show an 85 per cent bearing, the tailstocks scraped to fit the same. These boys are about 14½ years old, and have served six months’ apprenticeship.