Page 850 - Tungaloy Catalog

Use of TDXU and TDSU drills

Setting of drill body is an important issue for stable machining

Mounting the drill on turret (tool post)
 When mounting drill body, the cutting edges should be parallel to the X-axis of the machine.
 Usually, the drill body is mounted with the direction that the peripheral insert can be seen by the op-
erator.
 The flat on the shank is parallel to the cutting edges, by tightening the flat with the fixing screw, the
cutting edges are guaranteed to be parallel to the X-axis of the machine.

Turret Cutting edges should be Direction of fixing bolt on
parallel to the X-axis of the
machine Central edge tool block

X-axis of
machine

Peripheral edge

Usually, the drill body is mounted with the direction that
the peripheral insert can be seen from the operator
Checking of cutting edge height
 The cutting edge height is an important factor for stable machining.
 The cutting edge of central insert should be 0.008" lower than the rotating axis of machine.
 For checking the difference between rotating center and the tool block, please use a reference bar
that is from ground solid bar.
 In this case, the checking of the center height should be measured at the same position as the over-
11  When there isn’t a reference bar, the ground part of a boring bar can be used as a substitute.
hang length of the drill required.

should be about
Drilling Tools Difference: 0.008" Turret of the lathe

Dial gauge

Overhang length
of drill
Central edge
X-axis of
machine
Reference bar
Peripheral edge
Main Same length as
spindle the overhang of
drill
If the condition of cutting edge height is not
good, the height should be set by adjusting the
turret. Boring bar as a
A simple method is shown on the next page.
substitution

11–34 Relating Cutting Conditions Technical reference
pages
(11-14 )
(14-1)