Van Norman 204 User manual

204
Heavy Duty
Combination
Brake Lathe
Instruction Manual and Parts List
Van Norman 500 57th St., Marion, IA 52302 888-855-1789 319-377-9101 (FAX)
Copyright 2005 All Rights Reserved.
Equipment specifications, options and accessories subject to change without notice.

WARRANTY
Flywheel Grinders, 777 and 204C Brake Lathes
Van Norman will repair and/or replace, free of charge (FOB factory) all such defective
parts, only when returned to factory with shipping charges prepaid. This warranty does not
cover parts and supplies (wheel dresser/diamonds/abrasives) consumed in normal
operation of the machine.
Van Norman disclaims all other warranties, expressed or implied, as to thequality of any
goods, including implied warranties of MERCHANTABILITY and FITNESS FOR
PARTICULAR PURPOSES. UNDER NO CIRCUMSTANCES WHATSOEVER, SHALL Van
Norman BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ON LOST GOODWILL, LOST RESALE PROFITS, WORK
STOPPAGE, IMPAIRMENT OF OTHER GOODS OR ARISING OUT OF BREACH OF ANY
EXPRESS OR IMPLIED WARRANTY, BREACH OF CONTRACT, NEGLIGENCE OR
OTHERWISE, EXCEPT ONLY IN THE CASE OF PERSONAL INJURY.
Because of Van Norman’s constant program of product improvement, specifications are
subject to change without notice.
VAN NORMAN PROVIDES A LIMITED WARRANTY ON PRODUCTS WHEN
PURCHASED IN A NEW ANDUNUSED CONDITION TO BE FREE FROM DEFECTIVE
MATERIAL OR WORKMANSHIP FROM DATE OF PURCHASE FOR A PERIOD OF ONE
YEAR.
This warranty does not apply to a product that has been purchased in used condition, that
has failed due to improper installation, repairs, service or that has sustained damage
caused by accident, improper use or shipment.
For further information or questions, please contact Van Norman at 888-855-1789 or fax
319-377-9101.
PLEASE RETAIN THIS WARRANTY FOR YOUR RECORDS
Van Norman 500 57th St., Marion, IA 52302 888-855-1789 319-377-9101 (FAX)

204 Heavy Duty Combination Brake Lathe
RECEIVING SHIPMENT
Upon taking delivery of your machine, carefully inspect the assembly before removing
the crating and packing materials.
If evidence of damage exists, contact the shipper and Van Norman immediately.
Although Van Norman is not responsible for damage incurred during transit, you will be
provided assistance in preparation and filing of any necessary claims.
CAREFULLY READ THIS MANUAL BEFORE ATTEMPTING TO SETUP OR OPERATE THIS
MACHINE.
IMPORTANT NOTE
Always have your serial number ready when communicating with Van Norman
regarding parts or service.
Keep this manual in a safe place.
Date Received:
Serial Number:
(Serial Number location: Upper left corner at rear of unit)
Van Norman 1. 888-855-1789

204 Heavy Duty Combination Brake Lathe
SAFETY FIRST
This manual has been prepared for the owner and those responsible for the maintenance of this
machine. It’s purpose aside from proper maintenance and operations, is to promote safety
through the use of accepted practice. READ THE SAFETY AND OPERATING
INSTRUCTIONS THOROUGHLY BEFORE OPERATING THE MACHINE.
In order to obtain maximum life and efficiency from your machine, follow all the instructions in
the operating manuals carefully.
The specifications put forth in this manual were in effect at the time of publication. However,
owing to Van Norman’s policy of continuous improvement, changes to these specifications may
be made at any time without obligation.
Van Norman 2. 888-855-1789

204 Heavy Duty Combination Brake Lathe
SAFETY INSTRUCTIONS
1. Read, understand and follow the safety and operating instructions found in this manual.
Know the limitations and hazards associated with operating the machine.
2. Eye Safety: Wear an approved safety face shield, goggles or safety glasses to protect eyes
when operating the machine.
3. Grounding the Machine: Machines equipped with three prong grounding plugs are so
equipped for your protection against shock hazards and should be plugged directly into a
properly grounded three-prong receptacle in accordance with national electrical codes and
local codes and ordinances. A grounding adapter may be used. If one is used, the green
lead should be securely connected to a suitable electrical ground such as a ground wire
system. Do not cut off the grounding prong or use an adapter with the grounding prong
removed.
4. Work Area: Keep the floor around the machine clean and free of tools, tooling, stock scrap
and other foreign material and oil, grease or coolant to minimize the danger of tripping or
slipping. Van Norman/Kwik-Way recommends the use of anti-skid floor strips on the floor
area where the operator normally stands and that each machine's work area be marked off.
Make certain the work area is well lighted and ventilated. Provide for adequate workspace
around the machine.
5. Guards: Keep all machine guards in place at all times when machine is in use.
6. Do Not Overreach: Maintain a balanced stance and keep your body under control at all times.
7. Hand Safety: NEVER wear gloves while operating this machine.
8. Machine Capacity: Do not attempt to use the machine beyond its stated capacity or
operations. This type of use will reduce the productive life of the machine and could cause
the breakage of parts, which could result in personal injury.
9. Avoid Accidental Starting: Make certain the main switch is in the OFF position before
connecting power to the machine.
10. Careless Acts: Give the work you are doing your undivided attention. Looking around,
carrying on a conversation and horseplay are careless acts that can result in serious injury.
11. Job Completion: If the operation is complete, the machine should be emptied and the work
area cleaned.
12. Disconnect All Power and Air to Machine before performing any service or maintenance.
13. Replacement Parts: Use only Van Norman/Kwik-Way replacement parts and accessories;
otherwise, warranty will be null and void.
14. Misuse: Do not use the machine for other than its intended use. If used for other purposes,
Van Norman/Kwik-Way Products Inc. disclaims any real or implied warranty and holds itself
harmless for any injury or loss that may result from such use.
Van Norman 3. 888-855-1789

204 Heavy Duty Combination Brake Lathe
SPECIFICATIONS
Rotor
Capacity………………………….. 4" - 24" (102-610 mm)
Maximum Friction Surface………. 5 "(127 mm)Maximum
Maximum Thickness…………….. 2.5 "(64 mm)
Drum
Capacity…………………………. 6" – 28" (152–711 mm)
Maximum Depth………………… 8.75" (222 mm)
Flywheel (Flat or Stepped)
Capacity…………………………. 6" – 24" (152–610 mm)
Maximum Friction Surface……… 5" (127 mm)
Spindle Speeds…………………. 60, 100, 170 RPM
Feed Speeds Infinitely Variable 0 to —
Per minute, in. (mm)……………. 3.375" (85 mm)
Per revolution, in. (mm)………. 0.020 (508 mm)
Motor…………………………… 1 HP (.700 kw)
Weight
204C
Machine Net Weight…………….. 643 lbs. (292 kg)
Domestic Shipping Weight……… 730 lbs. (331 kg)
Export Shipping Weight………… 835 lbs. (379 kg)
Van Norman is committed to product innovation and improvement and therefore reserves the
right to change product specifications without notice.
Van Norman 4. 888-855-1789

204 Heavy Duty Combination Brake Lathe
INSTALLATION
Machine "Prep"
1. Carefully uncrate the lathe and wash off the anti-rust oil or any dirt accumulated
during shipment. Kerosene or any approved commercial solvent may be used.
DO NOT USE GASOLINE.
Locate and Position
1. Select a location, which provides a permanent LEVEL foundation — preferably a
concrete floor. Ample space should be provided for the operator to move completely
around the machine. We recommend 30" from the wall. Then permanently secure
machine in place using the four mounting feet on each corner of the machine base.
Electrical Motors
1. Additional electrical devices or special wiring that may be required in your area
should be bought locally. Any Overload or Undervoltage protection devices are not
furnished as standard equipment and may be purchased locally or by Special Quote
from Van Norman. The main spindle is to revolve CLOCKWISE when facing the
work light.
2. Main Spindle Motor draws 13.2 amps on 120V wiring and 6.6 amps on 230V wiring.
Lubrication
1. Use regular No. 40 S.A.E. non detergent oil in all cups, the “Zero-Max”, and the main
body.
2. The oil level in both the “Zero-Max” and main body were filled at the factory. Please
check these levels prior to running the machine.
a. Main body oil should be filled to hole (Figure 2A).
b. The “Zero-Max” should be filled to within 3/4 inch of the fill hole (Figure 1).
c.
C
D
B
A
Figure 1 Figure 2
3. The Vertical Shaft (Figure 2C) and Leadscrew Nut (Figure 2D) should be oiled daily
with 3-5 drops of oil.
Van Norman 5. 888-855-1789

204 Heavy Duty Combination Brake Lathe
INSTALLATION (continued)
4. Grease Spindle Bearing (Figure 3) once a month using a lithium based grease with
moly. The grease should be an NLGI Grade 1, GC-LB.
Figure 3
Cleaning / Maintenance
1. Do not use an air hose to clean machine. Use a brush to clear chips away. Clean
daily after use.
2. DO NOT use Gasoline to clean machine, use Kerosene or any approved solvent.
3. If machine is not used on a regular basis, wiping with No. 10 S.A.E. oil between uses
is advisable.
1. Spindle Stop
2. Handwheel for Spindle Position
3. Oil Fill (Oil Daily #30)
4. On/Off/Light Switch
5. Oil Fill & Breather
6. Spindle Arbor
7. Tool Bar (for Drum Turning) - 204S
8. Tool Holder Turret
9. Handwheel to position Tool Bit for Drum Turning - 204S
10. Chip Tray
11. Tool Storage Area
12. Speed Control Handle
13. Speed Lock Knob
14. Drain Plug
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204 Heavy Duty Combination Brake Lathe
COMPONENT/CONTROL IDENTIFICATION AND FUNCTION
1. Spindle Stop
2. Handwheel for Spindle Position
3. Oil Fill (Oil Daily #30)
4. On/Off/Light Switch
5. Oil Fill & Breather
6. Spindle Arbor
7. Tool Bar (for Drum Turning) – 204S
8. Tool Holder Turret
9. Handle wheel to position Tool Bit for Drum Turning –204S
10.Chip Tray
11.Tool Storage Area
12.Speed Control Handle
13.Speed Lock Knob
14.Drain Plug
4
3
2
1
13
12
5
6
7
8
9
10
11
Van Norman 7. 888-855-1789

204 Heavy Duty Combination Brake Lathe
STANDARD & OPTIONAL EQUIPMENT
STANDARD MACHINES
204C Disc/Drum Lathe with Powered & Manual Cross-Feed Slides, Base and Standard
Equipment
Part No. Description
804-2474-01 115V, 60 Hz, 1 Ph
804-2474-05 230V, 60 Hz, 1 Ph
804-8651-44 230V, 50 Hz, 1 Ph
STANDARD EQUIPMENT
804-8690-56 Twin Cutter Assembly
804-8671-10 Tool Bar for Drums
804-3021-71 Tool Bit Holder for Drums
804-8665-63 Carbide Bit Package
Rotor Bits, 4 (3 cutting edges)
Drum Bits, 2 (2 cutting edges)
Arbor Components
804-2040-42 1" Arbor w/Nut & Washer (25.4 mm)
000-1806-70 Spring
109-1032-09 Spacer, 1" (25.4 mm)
109-1033-06 Spacer, 2" (50.8 mm)
804-2040-44 Draw Bar
804-8658-22 Double Ended Cone Set for 1" Arbor
804-8658-23 Cone, 1.32" x 1.67" (33.53 x 42.42mm)
804-8658-24 Cone, 1.36" x 1.71" (34.54 x 43.43mm)
804-8658-25 Cone, 1.71" x 2.07" (43.43 x 52.59mm)
804-8658-26 Cone, 2.07" x 2.44" (52.59 x 61.98mm)
804-8658-27 Cone, 2.44" x 2.89" (61.98 x 73.41mm)
804-8664-64 Tapered Cone Set for 1" Arbor
804-8664-45 Cone, 1.15"–1.80" (29.21 - 45.72mm)
101-0243-00 Cone, 1.70"–2.35" (43.18 - 59.69mm)
101-0236-05 Cone, 2.25"–2.90" (57.15 - 73.66mm)
101-0237-02 Cone, 3.35"–4.00" (85.09 - 101.6mm)
804-8664-50 Cone, 3.90"–4.55" (99.06 - 115.57mm)
Clamp Bells
109-1011-09 4.25" (107.95 mm) O.D.
101-0235-40 5.75" (146.05 mm) O.D. (2 included)
Van Norman 8. 888-855-1789

204 Heavy Duty Combination Brake Lathe
STANDARD & OPTIONAL EQUIPMENT (continued)
Miscellaneous
Part No. Description
804-2059-20 Chip Tray
108-1061-00 Vented Silencer-Rotor
109-1032-09 Spacer, 1 x 1.5 x 1.5
804-8665-41 Solid Rotor Silencer, Magnetic Band, .250" x 48" (6.35 x 1219.2 mm)
101-0230-10 Automotive Drum Silencer
000-0600-70 Hex Key .187" (4.75 mm)
000-0600-54 Hex Key .125" (3.18 mm)
000-0600-20 Hex Key .312" (7.93 mm)
800-1017-39 Hex Key .375" (9.53 mm)
804-8664-43 Wrench, Draw Bolt
804-7803-35 Wrench, Arbor Nut
OPTIONAL ACCESSORIES
Arbors
804-2049-41 11/16" Arbor with Nut, Cone & Washer, Bore .875"–1.250"
(22.23 - 31.75 mm) 7.375" Long
804-2040-42 1" Arbor with Nut/Washer 9.75" L
804-8666-09 1 7/8" Arbor with Nut & Washer (for Ammco Adapters) 15.75" Long
804-2040-90 2" Arbor with Nut/Washer, 15.75" L
804-8677-10 Extended 2" Arbor with Nut & Washer, 19.88" Long
Double Ended Cones used for larger hubbed Drums & Rotors
804-8665-15 Cone, 2.82" x 3.18" (73.41–82.80mm)
804-866516 Cone, 3.20" x 3.56" (82.80–91.95mm)
804-8664-65 Light Truck Set for 1" Arbor
Bore Range 3.90"–5.65" (99.06-143.51mm) for Hubless Drums/Discs
804-8664-50 Cone, 3.90"–4.55" (99.06–115.5mm)
804-8664-50 Cone, 3.90"–4.55" (99.06–115.5mm)
804-8664-51 Cone, 4.45"–5.10" (113–129.54mm)
101-0639-00 Cone, 5.00"–5.65" (127"–143.51mm)
000-1806-70 Spring
804-2053-01 Clamp Bell, 6.25" (158.75mm)
804-2053-00 Clamp Bell, 7.75" (196.85mm)
804-8659-59 Hubless Adapter Set, Small Size for 1" Arbor, Bore Range
1.87"–3.00" (47.5 - 76.2 mm) LH
804-8659-60 Rotor Locator LH
804-8659-61 Cone, 1.875" x 3.125” (47.63 x 79.38mm)
804-8659-62 Spacer LH
804-8659-63 Locator Nut LH
102-0925-00 Wrench, Spanner
Van Norman 9. 888-855-1789

204 Heavy Duty Combination Brake Lathe
STANDARD & OPTIONAL EQUIPMENT (continued)
Optional Accessories
Part No. Description
804-8626-13 Hubless Adapter Set, Large Size for 1" Arbor, Bore Range
4.00"–5.75" (101.6-146.05 mm)
804-2020-23 Rotor Locator
804-4161-85 Cone, 3.68" x 5.93" (93.47 x 150.62mm)
804-4161-86 Spacer
804-2020-22 Locator Nut
804-1168-49 Wrench, Spanner
804-8667-75 Hubless / Composite Rotor Adapter Kit
804-2010-23 Hubless Adapter Set, Std. Size
804-8631-85 Backing Plate for 804-8631-86, 804-8631-87, 804-8657-12,
804-8656-98
804-8631-86 Adapter Plate, Taurus/Sable,G.M.,“W-Body,” Lincoln
804-8631-88 Backing Plate, Chevy 1500 (for 804-8631-89)
804-8631-89 Adapter Plate, Chevy 1500
Composite Rotor Backing Plates for 804-2010-23 Adapters
804-8631-85 Backing Plate for 804-8631-86, 804-8631-87, 804-8657-12,
804-8656-98
804-8631-86 Adapter Plate, Taurus/Sable,G.M., “W-Body,” Lincoln
804-8631-88 Backing Plate, Chevy 1500 (for 804-8631-89)
804-8631-89 Adapter Plate, Chevy 1500
804-8656-98 Adapter Plate, Jeep Cherokee
804-8657-12 Adapter Plate, Eagle Premier
804-8626-14 Hubless Adapter Set, Large Size for 2" Arbor, Bore Range
4.00"–5.75" (101.6–146.0mm)
804-8657-08 Rotor Locator LH
804-4161-85 Cone, 3.68" x 5.93" (93.4–150.6mm)
804-4161-86 Spacer
804-2020-22 Locator Nut LH
804-1168-49 Wrench, Spanner
Van Norman 10. 888-855-1789

204 Heavy Duty Combination Brake Lathe
STANDARD & OPTIONAL EQUIPMENT (continued)
Optional Accessories
804-8664-66 Medium Truck Set, for 2" Arbor, Bore Range 2.15"–6.10"
(54.61–154.94mm) for Hubless Drums /Discs
804-8664-53 Cone, 2.15"–2.80" (54.6–71.1mm)
804-8664-54 Cone, 2.70"–3.35" (68.5–85.0mm)
804-8664-55 Cone, 3.25"–3.90" (82.5–99.0mm)
804-8664-56 Cone, 3.80"–4.45" (96.5–113.0mm)
804-8664-57 Cone, 4.35"–5.00" (110.4–127.9mm)
804-8664-58 Cone, 4.90"–5.55" (124.4–140.9mm)
804-8664-59 Cone, 5.45"–6.10" (138.4–154.9mm)
101-0638-01 Spring
804-8662-02 Clamp Bell, 7.75” (196.85 mm) (2 included)
804-7803-05 Spacer, 2” (50.8 mm)
804-7803-01 Spacer, 3” (76.2 mm)
804-8664-67 Heavy Truck Set, for 2" Arbor, Bore Range 5.45"–8.30" (13.8.4–
210.8mm) for Hubless Drums / Discs
804-8664-59 Cone, 5.45"–6.10" (138.4–154.9mm)
804-8664-60 Cone, 6.00"–6.65" (152.4–168.9mm)
804-8664-61 Cone, 6.55"–7.20" (166.3–182.8mm)
804-8664-62 Cone, 7.10"–7.75" (180.3–196.8mm)
804-8664-63 Cone, 7.65"–8.30" (194.3–210.8mm)
101-0638-01 Spring
804-3000-84 Clamp Bell, 9.25" (234.95 mm) (2 included)
804-7803-05 Spacer , 2" (50.8mm)
804-7803-01 Spacer , 3" (76.2mm)
Miscellaneous
804-8665-64 Rotor Bits, Pkg/10 (3 cutting edges) 1/32" (.79 mm) Radius
804-8665-61 Rotor Bits, Pkg/10 (3 cutting edges) 1/64" (.4 mm) Radius
804-8665-62 Drum Bits, Pkg/10 (2 cutting edges)
804-7803-18 Solid Carbide Bit, .375" (9.53 mm) Shank
804-1408-22 Heavy Duty Tool Holder & Bit
804-1290-05 Tool Bit for 804-1408-22
101-0230-10 Automotive Drum Silencer
108-1062-00 Vented Rotor Silencer
804-8665-42 Truck Drum Silencer, 2.75" (69.85 mm) wide
804-8665-41 Solid Rotor Silencer Magnetic Band, .25" x 4" (6.35 x 101.6 mm)
804-8665-43 Brake Drum Wear Limit Gage, Range 6"–22" (152.4-558.8 mm)
804-8665-44 Rotor Micrometer, Range .30"–1.30" (7.62-33.02 mm)
804-8668-08 Disc Rotor Swirl Finisher, Non-Directional
804-8668-09 Replacement Pads, 25, 80 Grit
804-8668-10 Replacement Pads, 25, 120 Grit
804-2049-60 Drum Grinder for 204C,115V, 50 / 60 Hz, 1 Ph
804-2049-69 T-Bar Holder
804-3029-49 Tool Bar Extension, Small Drum Adapter
804-8665-45 Safety Shield
Van Norman 11. 888-855-1789

204 Heavy Duty Combination Brake Lathe
OPERATION
SPEEDS
1. Spindle speeds are 60, 100, and 170 RPM. To change RPM loosen thumb screw
(Figure 4 A & B). To remove belt guard (machine must be off) loosen wing nut
(Figure 4C), lift motor to free belt and put belt in proper groove. Replace motor and
tighten with medium tension on belt, replace belt guard. A larger diameter drum or
rotor requires a lower RPM. For most applications, Van Norman recommends the
middle pulley groove for passenger cars and light truck brake drums and rotors. The
outer pulley groove is for extremely small rotors and drums and the inner pulley
groove for very large drums and rotors.
A
C
B
Figure 4
FEED SLIDE
1. Feeds per revolution are 0 to .020". Feed per revolution should be as high as
possible for most profitable operation. Drums require a good finish. A setting of
.020" is used for rough cuts.
2. A large diameter drum or rotor requires a higher feed.
3. To change speeds loosen knob (Figure 5A) and move handle (Figure 5B), to desired
speed and lock knob.
Figure 5
B
A
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204 Heavy Duty Combination Brake Lathe
OPERATION (continued)
CHATTER CONTROL
1. Brake drums are dish or bell shaped and have a tendency to chatter. This can result
in a wavy or chatter finish accompanied by excessive noise. THE VIBRATION
DAMPENER BELT MUST BE USED AT ALL TIMES to prevent chatter. Securely
wrap belt around the outside of the drum or use proper “O” ring type on outside of a
rotor.
2. Dull, broken chipped or improper tool bits will cause chatter. ALWAYS use tool bits
supplied by the original manufacturer as they are designed to do a specific job.
3. A loose carbide tip on the tool holder will cause chatter. Make sure screw holding
carbide tip grips tip firmly.
4. A dirty uneven surface will crack the carbide tip and/or chatter.
TOOL BITS
1. This lathe is supplied with replaceable type throw-away carbide tips, part no. 804-
8665-62 (Figure 6) for the drum cutters and part no. 804-8665-61 for the rotor
cutters, (Figure 7).
Figure 6 Figure 7
INSTALLATION OF ARBOR
1. Select correct size mandrel for the work to be done, either a 1" diameter for work that
is 150 pounds or less or the heavy-duty 2" mandrel for work 150 to 500 pounds.
2. Slide mandrel into spindle taper.
IMPORTANT: Both mandrel and spindle tapers must be clean or else mandrel will
run out and taper may be damaged. Align pin in mandrel with slot in main spindle.
Screw in draw bar (Figure 8A), and lock tightly. DO NOT tighten excessively. Driver
pin will prevent arbor from slipping. Remove mandrel easily (Mandrel has non-
locking taper) by loosening nut then tapping lightly into the draw bar.
A
Figure 8
B
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204 Heavy Duty Combination Brake Lathe
OPERATION (continued)
RECONDITIONING DRUMS
1. The knob (Figure 8B) should be loosened when turning drums to insure spindle will
move out during operation. This screw must be tightened when cutting rotors.
2. This knob (Figure 9) should be tightened when doing drums and slide is in position.
Loosen when cutting rotors.
Figure 9
3. To engage feed of main spindle push lever (Figure 10A), to the right of handwheel
(Figure 10B), is the main control to move the main spindle “in” or “out”.
B
A
Figure 10
4. Crank (Figure 11) is used for moving the tool bit into the brake drum on the 204S.
This crank is graduated into thousandths and is direct reading. Example: If crank is
moved out .030", drum will be enlarged .030".
Figure 11
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204 Heavy Duty Combination Brake Lathe
OPERATION (continued)
5. To disengage feed loosen wing nut (Figure 12A) and slide stop (Figure 12B) to
desired position.
6. Reset stop (Figure 12B) every time machine is used on a different width drum. If
properly set, the machine will disengage automatically when it reaches the stop.
B
A
Figure 12
7. Measure the diameter of the drum with a micrometer to determine that the drum will
be within maximum reboring limits after reconditioning. It should also be in good
general condition.
8. Set the spindle speed to match the drum size (Figure 4, Page 12). Move the V-belt
on the pulley to the correct groove.
9. Mount the drum on the arbor using the proper adapters, cones and spacers (Figure
13).
Figure 13
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204 Heavy Duty Combination Brake Lathe
OPERATION (continued)
10.Wrap and secure the drum silencer band tightly around the drum (Figure 14).
11.Turn the cross feed handwheel and the spindle feed handwheel to their maximum
clockwise position. Then back off the cross feed handwheel 2 turns and the spindle
feed handwheel 4 turns.
12.Position the tool bar by loosening the tool bar clamp nut (Figure 14 & 15) and sliding
the tool bar inward toward the drum until the tool bit is close to the surface that is
going to be machined. The entire tool bar may also be swiveled to achieve the best
cutting position.
Figure 14 Figure 15
13.Turn the drum by hand to be sure that it runs true. Turn the lathe on and advance
the tool bit manually until it just contacts the drum surface and makes a scratch cut.
Back the tool bit off, stop the lathe. Loosen the arbor nut and rotate the drum one-
half turn. Retighten the nut, turn the lathe on and make a second scratch cut, stop
the lathe. If the first and second scratch cuts are opposite one another (180° apart)
remove the drum from the arbor. Check the mounting adapters and the arbor for
nicks, burrs or chips. Clean if necessary. If the scratches are side by side, proceed
turning the drum.
14.Turn the spindle feed handwheel until the deepest worn groove of the drum is
opposite the point of the tool bit. Advance the tool bit into the bottom of the groove
by rotating the tool bit into the bottom of the groove by rotating the cross feed
handwheel counter-clockwise.
15.The depth of cut dial will show the approximate reconditioned diameter of the drum.
Make sure that the resurfaced drum will be within the limits cast into the drum.
16. Roughing cuts should be no deeper than .010” (.25mm): finish cuts no shallower
than .002” (.05mm). Usually no more than 2 cuts are required to resurface a drum.
With the lathe running, set the depth of cut, dial to the desired depth and lock the
cross slide by tightening the cross slide locking knob.
Van Norman 16. 888-855-1789