HORIZONTAL BORING MILL
traversed the length of the ways. T-slots are machined
the entire length of the table. They are used to hold
down work and various attachments, such as rotary
the four major elements dscribed in the next
table angle plates.
paragraphs.
4. BACKREST or END SUPPORT: The
1. BASE and COLUMN: The base contains all
backrest is mounted on the back end of the ways. It
the drive mechanisms for the machine and provides a
supports arbors and boring bars as they rotate and
platform that has precision ways machined
travel lengthwise through the work, such as the in-line
lengthwise for the saddle. The column provides
boring of a pump casing or large bearing. The
support for the head and has two rails machined the
backrest blocks have an antifriction bearing; the
height of the column for full vertical travel of the
boring bar passes through and rotates within this
head.
bearing. The backrest blocks travel vertically with
2. HEAD: The head contains the horizontal and
the head.
auxiliary spindle and the mechanism to control them.
The head also provides a station on which you can
Navy machine shops and shore repair activities
mount various attachments. The spindle feed and
usually have two types of horizontal boring mills:
hand feed controls are contained in the head, along
The table type is used for small work, and the floor
with the quick traverse turnstile and the spindle feed
type for large work. The floor type is the most
engagement lever.
common of the two. This machine is well suited for
3. SADDLE and TABLE: A large rectangular
repair work where you often machine large, irregular
slotted table is mounted on a saddle that can be
parts.
Figure 8-8.--Horizontal boring mill.
8-6