MODEL SB1263
TAPER ATTACHMENT
Instruction Sheet
Introduction
This taper attachment mounts quickly to the
back bedway of your lathe, as shown in Figure 1.
Accurate tapers can be cut without repositioning
the attachment or having to offset the tailstock.
This taper attachment is heavy! Get
assistance when installing it on the lathe.
Wear heavy-duty leather boots with toe
protection, and keep hands and fingers away
from all pinch points. Ignoring this warning
can lead to severe crushing injuries!
Specifications
Designed for Lathe Models... SB1039, SB1049–52
Taper Per Inch Range........................ 0.00°–0.18”
Maximum Taper Length......................................9"
Minor Inch Scale Divisions.............................0.01”
Major Inch Scale Divisions.............................0.02”
Taper Angle Range .................................... 0°–10°
Figure 1. Taper attachment installed on rear of lathe.
Note: Splash guard removed for clarity.
Minor Angle Scale Divisions...............................1⁄2
°
Major Angle Scale Divisions................................1°
Construction..................................Cast Iron, Steel
Net Weight ................................................... 49 lbs.
Shipping Weight........................................... 60 lbs.
Factory........................................................ Taiwan
The Model SB1263 features an inches scale and
a degree scale. An angle adjusting knob with fine
threads achieves precise control when setting
tapers.
Another feature is the ability to use the taper
attachment without disengaging the cross slide
nut. This design allows the taper attachment to
be functional at any time by simply tightening
the two deadman clamp cap screws, which lock
the deadman clamp to the rear lathe way.
Copyright © January, 2012 by South Bend Lathe Co. Revised January, 2014 (ST)
WARNING: No portion of this manual may be reproduced without written approval.
For Product Manufactured Since 9/11 #TS14639 Printed in Taiwan
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Mfg. Since 9/11
Model SB1263
I N S T R U C T I O N S
Unpacking
Required for Setup
This item was carefully packaged to prevent
damage during transport. If you discover any
damage, please immediately call Customer
Service at (360) 734-1540 for advice. You may
The items listed below are required to
successfully set up and prepare this taper
attachment for operation. The installation
is intended to be permanent and will take
need to file a freight claim, so save the containers approximately one hour.
and all packing materials for possible inspection
by the carrier or its agent.
For Assembly
•
•
•
•
•
•
•
•
•
•
•
•
•
Another person
Cotton shop rags
Mineral spirits
Safety glasses
Oil can with any general machine oil
White lithium grease
Wrench 17mm
Inventory
Inventory (Figure 3)
Qty
A. Cap Screws M8-1.25 x 45mm ........................4
B. Taper Attachment Assembly.........................1
C. Taper Pins 8.7 x 7.7 x 47mm.........................2
D. Deadman Clamp Assembly ...........................1
E. Deadman Arm Assembly...............................1
Hex wrenches 3, 4, 5, 6, and 8mm
Phillips screwdriver #2
Precision ruler
Drill bit 19⁄64"
Tapered drill bit 8mm
Spiral pin reamer #6
— Small end diameter: 0.2773"
— Large end diameter: 0.3540"
Small metal hammer
Dial indicator w/magnetic base
A
B
•
•
C
D
E
Figure 3. Model SB1263 inventory.
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I N S T R U C T I O N S
Cleanup
Installation
The unpainted surfaces of your taper attachment This procedure explains installation of the taper
are coated with a heavy-duty rust preventative
that prevents corrosion during shipment and
storage. This rust preventative works extremely
well, but it will take a little time to remove.
attachment on a lathe without a DRO installed.
If the lathe has a Fagor DRO, the aluminum
mounting plate (or the taper attachment
housing) will need to have a small notch cut into
it (see Figure 4) to ensure proper fit.
Be patient and do a thorough job cleaning your
taper attachment. The time you spend doing this
now will give you a better appreciation for the
proper care of the unpainted surfaces.
DRO Mounting Plate
There are many ways to remove this rust
preventative, but the following steps work well
in a wide variety of situations. Always follow the
manufacturer’s instructions with any cleaning
product you use and make sure you work in a
well-ventilated area to minimize exposure to
toxic fumes.
Notch
Figure 4. Notch in DRO mounting plate, allowing taper
attachment housing to fit.
Note: The inner surfaces of the taper attachment
body were lubricated at the factory and do not
need to be cleaned at this time.
To install the taper attachment:
1. DISCONNECT LATHE FROM POWER!
Before cleaning, gather the following:
•
•
•
•
Disposable rags
2. With the help of another person, remove the
Cleaner/degreaser (WD•40 works well)
Safety glasses & disposable gloves
Plastic paint scraper (optional)
splash guard on the rear of the lathe.
3. Move the cross slide all the way toward the
front of the lathe to fully expose the lead-
screw end bracket (see Figure 5).
Basic steps for removing rust preventative:
1. Put on safety glasses and gloves.
Leadscrew
End Bracket
2. Coat the rust preventative with a liberal
amount of cleaner/degreaser, then let it soak
for 5–10 minutes.
Cap Screw
(1 of 2)
3. Wipe off the surfaces. If your cleaner/
degreaser is effective, the rust preventative
will wipe off easily. If you have a plastic
scraper, scrape off as much as you can first,
then wipe off the rest with a rag.
Lock Nut
4. Repeat Steps 2–3 as necessary until clean,
then coat all unpainted surfaces with a
quality way oil to prevent rust.
Set Screws
(2 of 4)
Figure 5. Leadscrew end bracket and fasteners.
4. Remove the two cap screws from the end
bracket (see Figure 5).
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Model SB1263
I N S T R U C T I O N S
5. Remove the four set screws (see Figure 5)
from the saddle. These holes will be used to
mount the taper attachment to the saddle in
a later step.
9. Loosen the set screw that secures the slide
block to the pivot pin, as shown in Figure 8.
Pivot
Pin
6. Remove the lock nut (see Figure 5) from the
end of the leadscrew.
7. Keep the bearing parts together in the same
orientation as they were installed as you
remove them and the end bracket from the
leadscrew (see Figure 6).
Slide
Block
Important: If a race is stuck to the surface of the
end bracket, use penetrating oil or mineral
spirits to separate the parts. Do not pry a
race loose, as this can damage it.
Figure 8. Slide block removal.
Inner Bearing Assembly
10. Lift the slide block off the pivot pin. Make
sure not to dislodge the brass anti-scoring
plug shown in Figure 9.
!
Outer Bearing
Assembly
Note: If the anti-scoring plug falls out of the slide
block, use a dab of grease to hold it in place.
End
Bracket
Figure 6. Leadscrew end bracket removed.
Brass
Anti-Scoring
Plug
8. Remove the four flat head screws that secure
the top cover, then remove the cover (see
Figure 7).
Figure 9. Slide block brass anti-scoring plug.
Figure 7. Attachment body top cover removed.
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I N S T R U C T I O N S
11. Unthread the two cap screws that secure the
end bracket (see Figure 10) and remove it
from the slide block.
14. Secure the slide block onto the end bracket
with the two cap screws removed in Step 11,
as shown in Figure 12.
!
End
Bracket
Pivot
Bore
Slide Block
Way (1 of 2)
Slide Block
Figure 10. End bracket removed from slide block.
Figure 12. Slide block installation.
15. Apply a thin coat of white lithium grease to
the inside of the pivot bore and both slide
block ways (see Figure 12).
12. Carefully clean the bearing parts that you
removed in Step 7 with mineral spirits.
When they are dry, repack them with white
lithium grease and re-assemble them.
Note: Make sure the brass plug remains inside
the slide block.
13. Install the inner bearing assembly, the end
bracket, and the outer bearing assembly
onto the leadscrew in the order shown in
Figure 11, then secure them with the
leadscrew lock nut removed in Step 6.
16. With the help of another person, raise the
taper attachment body underneath the
slide block so the pivot pin slides into the
pivot bore (see Figure 13), then secure the
assembly to the saddle with the four M8-1.25
x 45 cap screws.
Note: Tighten the lock nut until the bearings are
slightly pre-loaded and the end bracket has
zero end play—do not over-tighten it.
Cap Screw
(1 of 4)
Pivot Pin
& Bore
!
Taper Attachment
Body
Figure 13. Taper attachment body installed.
Figure 11. End bracket and outer bearing assembly
installation.
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17. Snug the slide block set screw until the brass 20. Thread the arm clevis into the taper
plug is slightly pre-loaded against the pivot
pin (see Figure 14).
attachment, then position the deadman
clamp so the end of the arm slides into the
arm clamp, as shown in Figure 16.
!
Note: Do not tighten the arm clamp cap screw or
the arm clevis hex nut at this time.
Deadman Clamp
Cap Screws
Arm
Clevis
Arm Clamp
Figure 14. Slide block set screw adjustment.
18. Replace the attachment body top cover.
Figure 16. Deadman clamp and arm.
19. Loosen the two cap screws on top of the
deadman clamp (see Figure 15), then slide
the clamp onto the rear bedway from the
tailstock end.
21. Position the deadman clamp towards the end
of the arm, then tighten the deadman clamp
cap screws to secure the assembly to the
bedway.
Cap Screws
22. Loosen the dovetail cap screws at each end of
the taper attachment body (see Figure 17).
Arm
Clamp
Dovetail Cap
Screw (1 of 2)
Clamping
Plate
Figure 15. Deadman clamp.
Rear
Angle Scale
Adjustment Knob
Figure 17. Taper adjustment knob and controls.
23. Turn the taper adjustment knob to bring the
dovetail to zero on both scales.
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24. Re-tighten both dovetail cap screws to secure 27. Inspect the assembly to determine if the
the zero setting.
deadman arm is parallel horizontally and
vertically with the bedway.
25. Move the carriage toward the tailstock until
the taper attachment body is against the
rear travel stop (see Figure 18).
— If the arm is parallel horizontally and
vertically with the bedway, proceed to
Step 26.
Note: If necessary, reposition the deadman clamp
on the arm so that it is at least 1" away from
the saddle (see Figure 18) and re-tighten
the clamp cap screws. This “saddle safety
gap” will prevent the saddle crashing into
the deadman clamp during taper operations.
— If the arm is not horizontally parallel with
the bedway:
a. Loosen the four adjustment cam set
screws shown in Figure 19.
Complete Travel Without
Deadman Clamp Contact
Adjustment Cam
Set Screws
1" Saddle
Safety Gap
Rear Travel Stop
Adjustment
Cam
Figure 18. Saddle gap.
Figure 19. Adjustment cam set screws.
b. Slide the adjustment cam and arm
clamp toward or away from the
You will need to perform Step 25 each time
you secure the deadman clamp to the bedway
to cut a taper to prevent the carriage crashing
into the deadman clamp.
deadman clamp until the arm is
horizontally parallel with the bedway.
c. Re-tighten the adjustment cam set
screws.
26. Move the carriage toward the headstock
until the taper attachment is against the
front travel stop.
— If the arm is not vertically parallel with
the bedway:
a. Loosen the four adjustment cam set
Note: In the following step, it may be necessary
to rotate the arm so the clevis allows the arm
to tilt in a particular direction.
screws shown in Figure 19.
b. Rotate the knurled adjustment cam
until the arm is vertically parallel with
the bedway.
c. Re-tighten the adjustment cam set
screws.
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28. Tighten the arm clamp cap screw (see
Figure 20) to secure the deadman clamp
assembly to the arm.
32. Move the carriage and taper attachment to
the other end and note any change in the
reading.
— If the indicator reading is 0.025" or
less, the tilt of the attachment table
is considered acceptable. Proceed to
Step 35.
Clevis
Hex Nut
— If the indicator reading is greater than
0.025", proceed to Step 33 to correct the
attachment table tilt.
Arm Clamp
Cap Screw
33. Loosen the four cap screws that secure the
attachment to the saddle, then rotate the
attachment assembly left or right to correct
the table tilt (see Figure 22).
Figure 20. Arm clamp cap screw and clevis hex nut.
Rotate
Body
29. Tighten the arm clevis hex nut to secure the
attachment to the arm.
30. Move the carriage toward the headstock
until the taper attachment is against the
front travel stop.
31. Mount the dial indicator magnetic base on
top of the saddle so that the indicator needle
is resting on the attachment table, as shown
in Figure 21, then zero the indicator.
Figure 22. Attachment table tilt adjustment.
34. Re-tighten the four cap screws to secure the
setting, then repeat Steps 32–33 to re-check
the table tilt.
!
Figure 21. Taper attachment alignment.
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I N S T R U C T I O N S
35. Drill two 19⁄64" holes into the saddle through
the pilot holes in the attachment casting (see
Figure 23).
Operation
The taper attachment is engaged for operation
when the deadman clamp is tightened on the
bedway and disengaged for operation when the
deadman clamp is loosened.
Engaging Taper Attachment
1. DISCONNECT LATHE FROM POWER!
Pre-Drilled Pilot
Holes for Taper Pins
2. Position the cutting tool at the proper
beginning position for the turning operation.
Note: Make sure that there will be at least 1"
clearance between the deadman clamp and
the saddle when the saddle is moved all the
way toward the tailstock (refer to Step 25 on
Page 8 for additional information).
Figure 23. Taper pin pilot holes.
36. Ream the holes with the #6 spiral pin reamer
deep enough so that the taper pins will fit
flush to the attachment casting surface.
3. Tighten the deadman clamp cap screws to
secure the clamp and taper attachment to
the bedway (see Figure 24).
37. Carefully tap the taper pins into the holes
until they are flush with the casting surface
to secure the attachment tilt alignment with
the saddle.
Note: If you need to remove the taper pins, the
internal pin threads are M6-1.
Deadman Clamp
Cap Screws
38. Re-install the lathe splash guard.
Figure 24. Deadman clamp cap screws.
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I N S T R U C T I O N S
4. Loosen both dovetail cap screws (see
Disengaging Taper Attachment
1. DISCONNECT LATHE FROM POWER!
Figure 25).
2. Loosen both deadman clamp cap screws (see
Figure 27)
Dovetail Cap
Screw (1 of 2)
Deadman Clamp
Cap Screws
Figure 25. Dovetail cap screw
(1 of 2).
Note: Depending on the operation, use either the
rear scale (degrees of taper) or the front scale
(amount of taper per inch of workpiece) in
the next step (see Figure 26).
Figure 27. Deadman clamp cap screws.
3. Loosen the dovetail way cap screws at each
end (see Figure 28).
Dovetail Cap
Screw (1 of 2)
Rear Scale
Front Scale
Taper Angle
Figure 28. Dovetail way cap screw
(1 of 2).
Taper Per/Inch
Workpiece
Length
4. Turn the taper adjustment knob until both
scales read zero.
5. Re-tighten both dovetail way cap screws.
Figure 26. Rear and front scales.
5. Turn the taper adjustment knob to set the
required taper, then re-tighten both dovetail
cap screws.
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I N S T R U C T I O N S
Cleaning & Protecting
Maintenance
Typically, the easiest way to clean debris and
grime from the attachment is to use a wet/dry
shop vacuum that is dedicated for this purpose.
The small chips left over after vacuuming can be
wiped up with a slightly oiled rag. Avoid using
compressed air to blow off chips, as it may drive
them deeper into moving surfaces and could
cause sharp chips to fly into your face or hands.
!
Always disconnect
lathe from power before
performing maintenance or
serious personal injury may
result.
To keep the unpainted surfaces of the
attachment table and dovetail ways rust-free and
in top condition, apply a thin coat of a quality
way oil after cleaning them.
Maintenance Schedule
For optimum performance from your taper
attachment, follow the maintenance schedule
below and refer to any specific instructions given
in this section.
Lubricating Slide Block, Pivot Pin,
& Internal Ways
Daily
1. DISCONNECT LATHE FROM POWER!
•
•
Check/correct loose mounting fasteners.
Clean debris and grime from all attachment
surfaces.
2. Referring to the assembly instructions,
remove the attachment body top cover and
the slide block.
•
•
Clean/protect attachment table and dovetail
ways.
Correct any other unsafe condition.
3. Clean the slide block, pivot pin, and the
internal ways with mineral spirits and shop
rags.
Monthly
•
Disassemble, clean, and lubricate slide block,
pivot pin, and internal ways.
Important: Make sure the brass plug in the slide
block set screw hole remains in place during
cleaning and lubrication.
4. When dry, apply a thin coat of white lithium
grease to all surfaces of the slide block, pivot
pin, and internal ways of the attachment
body, then re-assemble the parts.
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External Gib
The external gib is wedge-shaped and is held
Gib Adjustment
The goal of adjusting the gib screws is to remove
sloppiness or “play” from the ways without over-
adjusting them to the point where they become
stiff and difficult to move.
in position by three set screws (see Figure 30).
To adjust this gib, loosen the hex nuts and turn
the set screws in equal amounts. Test the feel of
the setting by moving the carriage, and adjust
the set screws as necessary to make it tighter or
looser. When satisfied with the movement, re-
tighten the hex nuts to secure the setting.
In general, loose gibs cause poor finishes and
inaccurate tapers; however, over-tightened gibs
cause premature wear and make it difficult to
move the carriage and cross slide.
Internal Gib
The internal gib is tapered and held in position
by a screw at each end (see Figure 29). To
adjust this gib, turn one screw 1⁄4 turn clockwise
and the other screw 1⁄4 turn counterclockwise,
so both screws move in the same direction and
the same amount. Test the feel of the setting by
moving the carriage, and adjust the gib screws as
necessary to make it tighter or looser.
Hex Nuts
Gib
& Set Screws
Figure 30. External gib.
Gib
Gib Screw
(1 of 2)
Figure 29. Internal gib.
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I N S T R U C T I O N S
Parts Breakdown
7
8
2
9
10
1
2
11
12
5
13
12
14
15
16
17
12
18
13
28
30
20
19
31
21
32
36
33
23
20
22
34
35
49
24
25
26
23
46
36
50
37
41
10
46
27
11
45
48
33
38
39
40
51
42
40
43
47
44
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Parts List
REF PART #
DESCRIPTION
REF PART #
DESCRIPTION
1
2
5
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
PSB1263001
BUSHING BRASS
CAP SCREW M6-1 X 20
END CAP
FLAT HD SCR M6-1 X 8
TOP COVER
SLIDE BLOCK
BRASS PLUG
SET SCREW M8-1.25 X 16
CAP SCREW M8-1.25 X 45
TAPER PIN
28
30
31
PSB1263028
PIVOT PIN
PSB1263002
PSB1263005
PSB1263007
PSB1263008
PSB1263009
PSB1263010
PSB1263011
PSB1263012
PSB1263013
PSB1263014
PSB1263015
PSB1263016
PSB1263017
PSB1263018
PSB1263019
PSB1263020
PSB1263021
PSB1263022
PSB1263023
PSB1263024
PSB1263025
PSB1263026
PSB1263027
PSB1263030
PSB1263031
PSB1263032
PSB1263033
PSB1263034
PSB1263035
PSB1263036
PSB1263037
PSB1263038
PSB1263039
PSB1263040
PSB1263041
PSB1263042
PSB1263043
PSB1263044
PSB1263045
PSB1263046
PSB1263047
PSB1263048
PSB1263049
PSB1263050
PSB1263051
PIVOT SADDLE
PIVOT SADDLE GIB
GIB SCREW
CAP SCREW M8-1.25 X 25
DOVETAIL WAY
CAP SCREW M6-1 X 25
CAP SCREW M8-1.25 X 20
COTTER PIN 4.5 X 30MM
CLEVIS
CLEVIS PIN
NUT BLOCK M6-1 X 25
T-NUT M8-1.25
NUT BLOCK
LEADSCREW
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
BODY
PLATE
PHLP HD SCR M6-1 X 10
SET SCREW M8-1.25 X 25
HEX NUT M8-1.25
CAP SCREW M8-1.25 X 30
STEEL FLUTED RIVET 2 X 5MM
INCH SCALE 0-14.5
DEGREE SCALE 0-8.5
STOP
TABLE
T-NUT M8-1.25
TABLE GIB
CAP SCREW M6-1 X 30
KNOB
DEADMAN ARM
SET SCREW M6-1 X 12
ARM CLAMP
ECCENTRIC CAM
CAP SCREW M10- 1.5 X 50
DEADMAN CLAMP
DEADMAN PLATE
-15-
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