STANDARD
EQUIPMENT:
• Abrasive segment holder for Cortland
segments
• Mounting for grinding wheel
• Puller for removing grinding wheel
• Mandrel for static balancing of grinding wheel
• Plate for static balancing of grinding wheel
• Dressing attachment for segmental grinding wheel
• Segmental grinding wheel guard
• Segment dressers (Star Design)
• Electromagnetic chuck with mag and demagnetizing installed
• Counter current wheel braking
• Automatic cycle programmer in-feed position numerical
display
• Table cleaning scrapper
• Coolant tank of 211 gallon capacity with sediment
trap
• Coolant pump and piping
• Grease gun
• Work lamp
• Clamping straps for transport
• Service wrenches
• Foundation bolts
• Service manual
• Equipped with 3/60/220 or 440V electrics (Specify)
OPTIONAL
EQUIPMENT
•
Segment holder for CORTLAND segments (spare)
• Mounting for grinding wheel (spare for item 1)
• Mounting for grinding wheel (spare for item 2)
• Grinding wheel brass guard to use when grinding
small work-pieces
• Stand for wheel static balancing
• Work table with T-slots
• Clamping devices for fastening work-pieces (of above
4” (100 mm) height and up
to 31” (800 mm) )
• Coolant tank of 211 gallon capacity with magnetic
separator
• Adaptation for in-process measurement with periodical
action of MARPOSS gauging
• Metric execution available
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| Machine
Specifications |
Republic 21/40 Rotary |
| Electromagnetic
chuck diameter |
39.3”
(1000 mm) |
|
Max
diameter of ground surface |
39.3”
(1000 mm) |
| Max.
height of ground work-piece (for new segments) |
17.7”
(450 mm) |
|
Max.
distance from segment holder to electromagnetic chuck upper
surface |
18.8”
(480 mm) |
| Max.
table slide shift |
20.8”
(530 mm) |
|
Table
slide shift rate of movement |
0.16”
ipm (4 mm/min) |
| Table
rotational speed (step change) |
5,
7, 10, 15, 30 rpm |
|
In-feed
minimal step |
.000039”
ipm (0.001 mm) |
| Continuous
automatic in-feed (semi automatic work) |
.003”
- .039” ipm (0,1-1,0) |
|
Step
automatic in-feed range for one table revolution |
|
| Ø
Semi-automatic cycle |
.00031”
- .0031” ipm (0,008-0,08) |
| Ø
Automatic cycle |
.00059”
- .0031” ipm (0,015-0,08) |
| Continuous
automatic in-feed rate (automatic cycle) |
.0007-.39”
ipm (0,02-1,0) |
|
Max.
grinding allowance at automatic in-feed |
Unlimited |
| Spark-out
time (automatic cycle) |
0
~ 40 sec. |
|
Max.
weight of ground work-piece |
1,763
lbs (800 kg.) |
| Electric
motor –wheel drive motor |
40
HP (30 kW) |
|
Total
power installed |
56
kVA |
| Overall
dimensions (L x W x H) |
136”
x 93” x 104” (3450 x 2360 x 2630 mm) |
|
Machine
weight |
15,433
lbs (7000 kg) |
OUTSTANDING
FEATURES:
ELECTROMAGNETIC
TABLE
Republic
rotary grinders come standard with a forty-inch (40”)
diameter electromagnetic chuck. With a work height of 14”
under new grinding wheel segments and 17” under used
segments, this allows a large capacity to meet your requirements.
Table speeds are 5, 7, 10,15, 20 and 30 rpm.
GRINDING WHEEL
Republic
rotary grinders are equipped with a twenty-one inch (21”)
diameter grinding wheel. Segment pockets are designed to
accept all standard wheel segments. This grinding wheel
head has rapid up and down, automatic feed or manual feed.
CONTROL PANEL/DRESSER
For
operator convenience, the controls are mounted on a control
panel mounted to the right of the access door. Functions
that are controlled from the operator’s panel are:
Start/Stop of the grinding wheel, drive unit of the grinding
table, rapid movement of the grinding wheel, control of
the electro-magnetic chuck and coolant system. A main motor
amp-meter is mounted on the headstock. The wheel dresser
unit is placed next to the main motor and uses standard
“star-style” dressers.
COOLANT SYSTEM
Republic
Rotary Grinders are designed as a dry base machine with
the coolant discharge located at the rear of the machine.
This discharge can be used with a 210 gallon coolant tank,
or connected to a central cooling system.
MAIN SPINDLE
A
forty (40 horsepower main spindle motor is supplied as standard
equipment. This motor is dual voltage and will be set to
each customer’s electrical requirements. (220/440/3/60).
Other voltages may require a transformer. (Option).
BASE
AND COLUMN
The
stress relieved cast-iron components are manufactured with
rigid box high-grade construction generously ribbed for
strength. One flat and one “V” way provide bearing
surface.
ELECTRICAL
CONTROL
All
starters and protective relays for the motors are mounted
in a steel cabinet on the back of the machine, completely
wired to motors and push buttons. Just one connection to
the power circuit is necessary for installation. The wheel
motor has reduced voltage (Star Delta) starting and plugging,
and full voltage running on 60 cycles, 3-phase current.
Depressing the “Stop” button will quickly bring
the spindle to a complete halt. A disconnect switch is included,
interlocked with the door of the control cabinet. Pushbutton
circuits are 115-volt and clearly marked for quick, easy
identification. An ammeter for the main motor is conveniently
located for ease of operation. This is a useful guide for
maximum rate of feed, and shows when wheel dressing is necessary.
LUBRICATION
The
upper and lower spindle bearings are grease-lubricated periodically.
Lubrication of the table ways, feed mechanism, lead screw
and rotary table is continuous and automatic. The head ways
and in-feed mechanism are lubricated from a semiautomatic
pushbutton. Table rotation gears operate continuously in
oil, in a casing sealed against dirt and water.
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