Brown & Sharpe Mfg. Co.
139
Gutting Two Grooves in Six Steel Gores at One Traverse on a No. 5 B Heavy Plain Milling Machine
This illustration shows an unusually heavy milling operation, consisting of cutting two grooves, each 1.17" wide and 516" deep, in six steel forgings at one traverse of the table.
Three sets of index centres of a special design are employed, and two steel cores are mounted on the arbor on each pair of centres.
The cutters are of a special form to cut two grooves and the top of the intervening space between the grooves.
For such a cut as this, a large arbor is required, and it must be very rigidly supported; intermediate arbor yokes are, therefore, placed between the cutters.
Lard oil is used as a cutting lubricant.
