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We reserve the right to change the specifications and
design of our products without notice.
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DU-500 AUTOMATIC DRILL UNITS & MACHINES
Air-Hydraulic & Full-Hydraulic
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DU-500
Drilling Machine
with Fixed-Spindle
Drillhead,
Bushing Plate,
Workholding Fixture
and Fixture Base
DU-500
Drilling Unit with
Overhead Motor and
Gear Drive
fi
I
DU-500
Drilling Unit with
Direct Drive
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.... for drilling, reaming, counterboring, countersinking and spotfacing
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DU-500 AUTOMATIC DRILL UNITS
HYDRAULIC and AIR-HYDRAULIC
The DU-500 is a quill-type automatic drill unit whose
clean, simple design and
exceptionally reliable
assure
free service life. Spindle, quill and piston are in-line. Drive
spindle is mounted in sealed, pre-lubricated, double-row
bearings; the
ends by extra-long bearings. All steel parts are of heat-
treated, chrome-moly steel; the housing is of cast alumi
num alloy. Electrical components are built to J.I.C.
standards.
Capacity:
@ 4-ipm feed
Thrust
Rapid Advance & Retract
Maximum Spindle Torque
Feed Rate
Length of Stroke
Depth Control: Standard
* Hydraulic
+ Available on overhead pulley drive unit, and on drilling machine
in
mild steel,
With Optional Dwell Control To within 0.0005
tank
and pump are external
quality
construction throughout
operation and
diameter quill is supported at both
Air-Hydraulic
One 7
/«” drill
1500 lbs. @ 100-psi
100 ipm @ 100-psi
2100 inch-lbs.
Fully adjustable, 0 to 40 ipm
To within 0.005"
One Vh
4500 lbs. @ 300-psi
180 ipm @ 1 2-gpm
4" or 6"
long
SPECIFICATIONS
Full-Hydraulic*
” drill
+
”
only.
trouble-
The DU-500 is flexible and versatile. It may be used in
any position, at any angle. It may be arranged for push
button or
trols permit interlocking with other units. Available as
optional equipment are foot switch, double-palm cycle
start buttons, automatic cycle switch and timer, dwell con
trol and timer, timed reciprocating cycle, and skip feed.
Available with either direct drive or overhead-mounted
motors, the DU-500 lends itself ideally to incorporation
into special machines.
Motors
Drive Spindle
Types of Drive for Unit
Mounting
fully-automatic
operation and its electrical con
Air-Hydraulic
220/440-volt, 3-phase, 60-cycle, totally-enclosed
fan-cooled; “C” face or foot mount; 3, 5 or
71/2
HP;
1140 or 1725 RPM.
Standard ASA I1/-*" diameter keyed hole for
standard ~2 or ~3 Morse taper adjustable
adapter. Flanged type quill is available for
use with multiple-spindle heads.
Direct; overhead motor mount with pulley and
belt; or overhead motor mount with gear drive.
In any position; J
for hold-down.
& Full-Hydraulic*
A" locating keyway; flanged base
AIR SUPPLY
filter
regulator
iTOR
IU8RICA
i
m s
DIRECTION L
CONTROL
AIR VALVE
LS-» LS2
rfl
CYLINDER
------
mm1-
ACCUMULATOR
tS
Li 3
AIR-HYDRAULIC
LS-1 LS-2
Li 3
V
CYLINDER
ADJ , r*o MAY
FEED > V VALVE
f
MYD
DIRECTJON
ROL VALVE
CONT
FULL-HYDRAULIC
£3
§1 0IL
SPINDLE
Was
ssr
1
SPINDLE
iwasLi
METHOD of OPERATION
The DU-500 is a quill-type air-hydraulic or full-hydraulic drill unit incorporating a 5" diam
eter steel cylinder, an aluminum piston, and electrical cycling controls. Rapid advance
and retraction of the spindle are by means of shop air in the air-hydraulic model, and
by means of pressurized oil from an external source* in the full-hydraulic model. Feed
rate in both models is controlled by an adjustable feed flow control valve.
In the start position, the piston is to the rear of the cylinder, which is filled with oil.
When the start button is pressed, a relay actuates the directional control valve causing
pressurized air (or oil) to enter the rear of the cylinder. The piston moves forward
rapidly, pushing the oil through a normally-open two-way hydraulic valve. In the air-
hydraulic model the oil flows into a hydraulic accumulator; in the full-hydraulic model it
flows into the reservoir.
As the spindle begins its forward motion, safety switch LS-1 disconnects the start switch
so that it is removed from the circuit; this switch may also be used to interlock two or
more units.
At the end of the rapid advance portion of the stroke, microswitch LS-2 is actuated,
energizing a solenoid which closes the two-way hydraulic valve. The exhaust oil now
flows through the adjustable feed flow control valve, and the piston and spindle then
advance at the predetermined feed rate until forward limit switch LS-3 is reached.
At the end of the stroke, the normally closed forward limit switch LS-3 opens,
the hydraulic two-way valve to open and the directional control air valve to
now flows in the rear of the hydraulic accumulator, and oil is forced through the wide-
open two-way hydraulic valve back into the front of the cylinder, returning the piston
and spindle to 6tart position. Upon contact, limit switch LS-1 closes the circuit for the
next cycle.
At the end of the drilling stroke, the normally-closed limit switch LS-3 opens, reversing
the directional control valve and the two-way hydraulic valve. Oil is then pumped into
the front end of
voir, causing the piston and
limit switch LS-1 de-energizes the reverse solenoid in the directional control valve,
returning the valve to neutral position.
An emergency reverse button on both
the relays at any portion of the stroke, causing the piston and spindle to return rapidly
to start position.
* Hydraulic pumping system, including pump, motor, tank and all necessary fittings and
tubing can be provided with full-hydraulic units and machines.
the
Spindle Retraction — Air-Hydraulic
Spindle Retraction — Full-Hydraulic
cylinder and exhausted from the rear of
spindle to
retract rapidly to the start
air-hydraulic
and full-hydraulic models de-energizes
the
cylinder into the
position.
causing
reverse; air
reser-
Upon contact,
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Page 3
DU-500 DRILL UNIT DIMENSIONS
if
HLh±H-
B
E
H0Le.
WITH -rr K WAY
T5
OR
hole
WITH KWArA.
*HDIA
>B i!XL
,6>KH0LtS
.750 L
KEY WAY
DIRECT DRIVE
as
— 10 I
'O AO
r
~fe6
—
-
Spindle Speeds:
1140 or 1725 rpm
-—2iS
*
16
’
s
28^ |
j
3-Xlt‘>
J
it ith*
--
------
B
Spindle speeds available by changing gears:
V.
33 to 2930 rpm with 1140-rpm motor
-8
"i
•8
29
fe
!
Spindle speeds available by changing pulleys:
515 to 2480-rpm with 1140-rpm motor
780 to 3450-rpm with 1725-rpm motor
^Higher speeds
can be furnished on request.
15L
o
tgHfOiAHOLt-
H
K
WAY
WIT
OR
HOLE
WITH KWAY-fX^-^-i
iA
■
750
x
m
/
KEYWAY
STROKE
4
(4)j| SLOTS ON
5 BOLT CIRCLE
{^|gS»A HOEE.y
WITH -Jf K
WAY
6.937
(6),^H0LES-
730
KEY WAY
STROKE A
4
6
GEAR DRIVE
1
—
9
J £
i
il
1-8XT
B
A
20
25 7/8
12
PULLEY DRIVE
141
XU-
I
0
12
16
C
—
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Belt guard removed to
show pulleys and belt
Page 4
DU-500 AUTOMATIC DRILLING MACHINE
The DU-500 drilling machine consists of the DU-500 automatic drill unit mounted on a heavy, ribbed cast iron table with
welded steel base by means of a sturdy, cast iron box column with raising and lowering mechanism. The machine in
corporates all the features and characteristics of the DU-500 into a rugged, high-production vertical drilling machine.
It may be used for single-spindle operation, with push-button or automatic cycling controls; with the addition of a multi
spindle drillhead, it converts quickly into an efficient, low-cost multiple-spindle drilling machine.
Electrical controls are to JIC standards. The coolant tank, pump and piping are integral parts of the machine. The over
size worktable facilitates use of high-production fixturing. Standard belt drive permits a wide range of spindle speeds
by changing pulleys.
3M-274
/
TOOL & MACHINE COMPANY, INC. 1
YORK. PENNSYLVANIA 17405
Printed in U.S.A.
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