Cogsdill Tool Products, Inc. Diamond burnishing tools

Cogsdill Tool Products, Inc.

Diamond
burnishing tools

For producing low microinch

finishes on shafts or faces of any

diameter, or on large bores.

■ Four designs allow use on
most turning machines,
manual or CNC

■ Replaceable, polished
diamond insert

■ Adjustable for optimum
burnishing pressure

Cogsdill Diamond Burnishing Tools Four tool designs to suit your application requirements:
are simple, efficient tools designed to
produce mirror-like finishes on a ■ DB-1 For general purpose machining
wide range of ferrous and non- ■ DB-2 For use where work length is restricted
ferrous part surfaces on most turning ■ DB-3 and DB-4 For use on CNC machining centers –
machines.
the tool holders are offset so that the diamond insert
Set up and cycle times are short, is on center
even for unskilled operators. In all
cases, the replaceable diamond insert
can be changed quickly; on some
models without removing the tool
holder from the machine.

44

Diamond burnishing tools

The Cogsdill Diamond Burnishing in the tool post of a manual lathe,
Tool is designed to produce high automatic, or in CNC equipment.The
quality, low microinch burnished tools can be used on both large and
finishes on shafts, large bores, and small diameters, and are ideal for
faces.With most metals, a turned or short production runs.The Diamond
ground part with a properly Burnishing Tool can produce quality
prepared 80 to 100 microinch finish finishes on interrupted surfaces, such
can be burnished to a 4 to 8 as a shaft with a keyway or the face
microinch finish in seconds. Cast iron of a flange having a series of bolt
can usually be burnished to an 8 to holes.
15 microinch finish.
While the tool must be used with
Cogsdill Diamond Burnishing Tools coolant, no special coolant is
can burnish virtually any size stock; required. Straight oils, soluble oils,
from carbon steels to tool steels, cast and synthetic coolants can be used
iron to alloys, and most ferrous and to provide the necessary lubrication.
non-ferrous metals.The premium
quality diamond burnishing insert is diamond
polished and contoured to provide
superior finishes and excellent tool
life.

Since set up and operation is
relatively simple, no special operator
skills are required. Diamond
Burnishing Tools are versatile . . .
various models are designed for use

burnishing tools

Replaceable
diamond insert is
polished and
contoured for
superior finishes
and long tool life.

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Diamond burnishing tools

How it works

The Cogsdill Diamond Burnishing recommended starting point for mild burnishing action. Likewise, if an
Tool is mounted in the tool post of steel. Slight adjustments in the interrupted surface is burnished,
the desired machine.The diamond burnishing pressure can be made, if such as a shaft with a keyway or a
burnishing point is brought into necessary, to achieve the optimum flange with bolt holes, the tip of the
contact with the workpiece at the finish.To adjust the burnishing tool will drop into the interruption
centerline of the part and pressure, tighten the adjustment but “climb up” the other edge due to
perpendicular to the surface being screw to increase pressure or loosen the radius on the diamond.
finished. The tool is then fed into the the screw (turn counterclockwise) to
workpiece an additional .002 or .003 reduce the pressure. CAUTION: It is important NOT to
inch (.05 or .08mm) to allow the exceed the recommended amount of
diamond insert to become The prefinish on most metals interference.An excessive projection
disengaged from the stop in the should be approximately 80 to 100 of the diamond insert into any
holder.The spring, with its preload, R.M.S. for best results.A feed rate of surface interruption could cause tool
forces the diamond against the .003 to .004 inches (.076 to .102mm) breakage, as the diamond insert
workpiece.The tool is then fed along per revolution at speeds up to 750 could not perform its “climbing”
the surface of the rotating workpiece surface feet per minute (229 surface action. (Note:Adjustment of the
to produce a mirrorlike finish. meters per minute) is generally burnishing force does not affect the
recommended when using the amount of interference.)
As a recommended starting point Cogsdill Diamond Burnishing Tool.
the adjusting screw should be Note: Diamond burnishing tools do
tightened (turn clockwise) until all Normally, after the tool has been not have the advantage of an
clearance between the push rod and set to provide the .002 to .003 inch overlapping effect as with multi-roll
the spring is removed.Then tighten (.05 to .08mm) “interference”, it can tools, and for this reason slower
the screw another 1 to 2 turns which be fed onto the rotating work-piece feed rates and/or multiple passes
will compress the spring to provide and allowed to feed off.The slight over the part may be required in
the necessary preload to the radius of the diamond tip is sufficient order to produce the desired finish.
diamond insert.This is the to cause the tool to “climb over” the
edge of the part and begin its

Diamond Burnishing Tools are adjustable for optimum burnishing pressure.
For the DB-1 and DB-2 models, the adjustment screw is located in the end
of the tool. For models DB-3 and DB-4, the adjustment screw is located on
the side of the tool.

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Diamond burnishing tools

Standard tool specifications

DB-1

DB-2

DB-3

DB-4

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Cogsdill Tool Products, Inc.

UniversalTM
burnishing tools

For burnishing shafts, faces, tapers,

contours, and relatively large IDs

(greater than 2.750 inches/69.85mm)

■ Boring-bar style and Indexable
turning-holder style designs

■ Tool designs to suit any part
size or configuration, or any
turning machine

■ Low surface finishes
■ Standard, available

off-the-shelf
■ Adjustable for optimum

burnishing pressure
■ Hardened steel or

carbide rollers

UBT-T1 indexable turning-holder style burnishing tool
(Left-hand tool shown)

UBT-B1 boring-bar style burnishing tool
48

UniversalTM burnishing tools

Versatility

UBT-B1 burnishing O.D. UBT-B1 burnishing face

UBT-T1 burnishing taper Burnish

(Left-hand tool shown) any size, any
configuration,
on any turning
machine.

49

UniversalTM burnishing tools

Turning-holder style

UBT-T1

UBT-T2

Roll shield installed above

UBT-T3
50

UniversalTM burnishing tools

Turning-holder style

UBT-T1 R2.36 [R0.093] ø57.2 [2.25]
Roll
FOR 22º30' 0º 54.6 [2.15]
BURNISHING OUTSIDE Position Position 30.0 [1.18]
DIAMETERS, FACES, 128.0 [5.04] 25.3 [1.0]
45º Position 148.5 [5.85]
TAPERS, AND
CONTOURS 67º30'
Position

90º
Position

76.2 [3.00]

COGSDILL TOOL PRODUCTS
UNIVERSAL BURNISHING TOOL
MODEL No. UBT-T1-LEFT HAND

76.2 [3.00] Tool Holder
106.4 [4.19] Datum
126.9 [5.00]

LEFT HAND

ø57.2 [2.25] R2.36 [R0.093]
Roll
54.6 [2.15] 0º 22º30'
30.0 [1.18] Position Position
25.3 [1.0] 128.0 [5.04]
148.5 [5.85] 45º
Position

67º30'
Position

90∞
Position

76.2 [3.00]

COGSDILL TOOL PRODUCTS
UNIVERSAL BURNISHING TOOL
MODEL No. UBT-T1-RIGHT HAND

Tool Holder 76.2 [3.00]
Datum 106.4 [4.19]
126.9 [5.00]

RIGHT HAND

51

UniversalTM burnishing tools

Turning-holder style

Ref 47.0 [1.85] UBT-T2

Ref Burnishing Force 71.1 [2.80] FOR
175.6 [6.91] Adjusting Screw 126.1 [4.96] BURNISHING

ÿ54.0 [2.125] Cogsdill Tool Products 47.0 [1.85] OUTSIDE
UBT-T2 ~ Left Hand 50.8 [2.00] DIAMETERS
R1.5 [R0.06] Compress 0.05mm
25.2 [0.99]
After Contact
SPEED - 45 m/min
FEED - 0.05 mm/Rev

127.1 [5.00]

25.4 [1.00]

LEFT HAND 99.1 [3.90]
Ref 47.0 [1.85]

Ref Burnishing Force
175.6 [6.91] Adjusting Screw

Cogsdill Tool Products
UBT-T2 ~ Right Hand
Compress 0.05mm

After Contact
SPEED - 45 m/min
FEED - 0.05 mm/Rev

71.1 [2.80]
126.1 [4.96]

ÿ54.0 [2.125] 127.1 [5.00]
R1.5 [R0.06] 99.1 [3.90]

25.4 [1.00] 25.2 [0.99]
50.8 [2.00]

47.0 [1.85]

RIGHT HAND

52

UniversalTM burnishing tools

Turning-holder style

UBT-T3 99.1 [3.90]

Ref Burnishing Force Ref
181.5 [7.15] Adjusting Screw 47.0 [1.85]

Cogsdill Tool Products 71.1 [2.80]
UBT-T3 ~ Left Hand 132.0 [5.20]
Compress 0.05mm

After Contact
SPEED - 45 m/min
FEED - 0.05 m/Rev

FOR R0.8 [R0.03] 135.4 [5.33]
BURNISHING LARGE
OUTSIDE DIAMETERS, 25.4 [1.00] 47.0 [1.85]

(GREATER THAN 50.8 [2.00]
100mm/4.00 in.) 25.2 [0.99]

LEFT HAND

Ref 99.1 [3.90] Ref
181.5 [7.15] 47.0 [1.85]
Burnishing Force
Adjusting Screw 71.1 [2.80]
132.0 [5.20]
Cogsdill Tool Products
UBT-T3 ~ Right Hand
Compress 0.05mm

After Contact
SPEED - 45 m/min
FEED - 0.05 m/Rev

R0.8 [R0.03] 135.4 [5.33]
25.4 [1.00]
25.2 [0.99]
50.8 [2.00] RIGHT HAND
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47.0 [1.85]

UniversalTM burnishing tools

Boring-bar style

UBT-B1
UBT-B2

UBT-B3

Roll shield installed above

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UniversalTM burnishing tools

Boring-bar style ø 50.80 [2.000] UBT-B1

ø54.0 [2.125]
Roll

30.0 [1.180] COGSDILL
UNIVERSAL BURNISHING TOOL
UBT-B1

305 [12.00] 152 [6.00] FOR BURNISHING
ø25.40 [1.000] OUTSIDE DIAMETERS,
R1.5 [R0.06] FACES, AND LARGE INSIDE
DIAMETERS (IDS GREATER
ROLL THAN 70mm/2.75 in.)
ø33.0 [1.300]
UBT-B2

COGSDILL TOOL PRODUCTS
UNIVERSAL BURNISHING TOOL
MODEL UBT-B2

17.70 [0.697] ø31.75 [1.250] A SMALLER VERSION
R1.5 [R0.060] OF THE UBT-B1
101.6 [4.00]
34.2 [1.347] UBT-B3
212.2 [8.35]

ø50.80 [2.000]

COGSDILL 152 [6.00] FOR USE IN SMALLER INSIDE
UNIVERSAL BURNISHING TOOL DIAMETERS (IDS GREATER
UBT-B3 THAN 70MM/2.75 IN.) OR ON
LARGE OUTSIDE DIAMETERS
324.5 [12.78]
(GREATER THAN
R0.8 [R0.03] 100mm/4.00in.)

55

UniversalTM burnishing tools

Set-up and operating instructions for UBT-T Tools

Note: UBT™ single-roll burnishing tools do not have the advantage of an overlapping effect as with multi-roll tools,
and for this reason slower feed rates and/or multiple passes over the part may be required in order to produce the
desired finish.

UBT-T1 tool set-up

Loosen the load adjusting screw. Retighten the
adjusting screw until it comes into contact with the
spring. Continue to tighten screw 1/2 turn past snug.
This is a recommended starting point for mild steel.

Adjustments can be made to the burnishing force to
achieve optimum finish.Tighten the adjusting screw
clockwise one turn to increase the burnishing force, or
counterclockwise to reduce the force.

Roll orientation is adjustable in 22°-30’ increments.
Loosen mounting screws two turns. Lift housing from
shank. Rotate to desired position, making sure
castellations are engaged.Tighten mounting screws.

UBT-T2 tool set-up UBT-T3 tool set-up

Loosen the load adjusting screw. Retighten Loosen the load adjusting screw. Retighten the adjusting
the adjusting screw until it comes into screw until it comes into contact with the spring. Continue to
contact with the spring. Continue to tighten tighten screw two turns past snug.This is a recommended
screw four turns past snug.This is a starting point for mild steel.
recommended starting point for mild steel.
Adjustments can be made to the burnishing force to
Adjustments can be made to the achieve optimum finish.Tighten the load adjusting screw
burnishing force to achieve optimum finish. clockwise to increase the burnishing force, six turns total, or
Tighten the adjusting screw clockwise to counterclockwise to reduce the force.
increase the burnishing force, six turns total,
or counterclockwise to reduce the force. To index to a new roll station, pull off cover. Loosen
locking screws
and slide cage
forward
approximately
0.157 (4.0mm)
until it
disengages from
pin. Rotate cage
approximately
60°, until pin
aligns with slot
in cage, and
push back.
Tighten locking
screws and
replace cover in
position shown.

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UniversalTM burnishing tools

UBT-T TOOLS

Set-up and operating instructions for UBT-T tools

UBT-T tool operation

Mount any UBT-T tool in the and part so that the roll will float in life, coolant is required.Any soluble,
desired turning station. Use a UBT-T its spring travel. Interference should synthetic, or straight oil can be used.
tool that corresponds with the not be used to increase burnishing Whenever possible, and for best
respective turning tool. Bring the tool force; burnishing force should only results, the tool should be fed
into contact with the part to be be adjusted with the load adjusting towards the spindle when burnishing
burnished; contact has occurred screws.This ensures the tool can be diameters and towards the centerline
when you see the mandrel rotating. fed on/off the part and across when burnishing faces. (Note: UBT-T2
interruptions without damage to the and UBT-T3 tools cannot be used to
Feed the tool another 0.003-0.005 tool or workpiece. burnish faces.)
inch (0.08-0.13mm) into the part to
provide interference between the roll For optimum results and long tool

ROLLS FOR UBT-T TOOLS

ITEM NO. TOOL TYPE ROLL TYPE & RADIUS
UBT-006 UBT-T1 HARDENED STEEL, .093 IN. (2.36MM)
UBT-007 UBT-T1 HARDENED STEEL, .030 IN. (0.76MM)
UBT-010 UBT-T1 CARBIDE, .093 IN. (2.36MM)
UBT-015 UBT-T2 HARDENED STEEL, .060 IN. (1.52MM)
UBT-016 UBT-T2 CARBIDE, .060 IN. (1.52MM)
6100-708-00312 UBT-T3 HARDENED STEEL, .030 IN. (0.76MM)

57

UniversalTM burnishing tools

Set-up and operating instructions for UBT-B Tools

Note: UBT™ single-roll burnishing tools do not have the advantage of an overlapping effect as with multi-roll tools,
and for this reason slower feed rates and/or multiple passes over the part may be required in order to produce the
desired finish.

UBT-B1 tool set-up

Loosen the load adjusting screws. Retighten the adjusting
screws until they come into contact with the spring. Continue
to tighten both screws one turn past snug.This is a
recommended starting point for mild steel.

Adjustments can be made to the burnishing force to
achieve optimum finish.Tighten the adjusting screws
clockwise to increase the burnishing force, three turns total,
or counterclockwise to reduce the force.

UBT-B2 tool set-up UBT-B3 tool set-up

Loosen the load adjusting screws. Retighten the Loosen the load adjusting screws. Retighten the
axial adjusting screw until it comes into contact adjusting screws until they come into contact with
with the spring. Continue to tighten three turns the spring. Continue to tighten both screws one turn
past snug.This is a recommended starting point for past snug.This is a recommended starting point for
mild steel. mild steel.

Tighten the radial adjusting screw until it comes Adjustments can be made to the burnishing force
into contact with the spring. Continue to tighten to achieve optimum finish.Tighten the adjusting
1-1/2 turns past snug. Do not tighten beyond this screws clockwise to increase the burnishing force, for
point; overloading this screw will not allow the tool a total of three turns, or counterclockwise to reduce
to float on its spring travel and will impede tool the force.
function.
To index to a new roll station, pull off cover. Loosen
Adjustments can be made to the burnishing force locking screws and slide cage forward approximately
to achieve optimum finish.Tighten the axial 0.157 (4.0mm) until it disengages from pin. Rotate
adjusting screw only.Turn clockwise to increase cage approximately 60°, until pin aligns with slot in
burnishing force, for a total of 6-1/2 turns, or counter- cage, and push back.Tighten locking screws and
clockwise to reduce the force. replace cover in position, exposed roll opposite
orientation red spot.

58

UniversalTM burnishing tools

UBT-B TOOLS

Set-up and operating instructions for UBT-B tools

UBT-B tool operation

Mount any UBT-B tool in the its spring travel. Interference should synthetic, or straight oil can be used.
desired boring bar station. (Note: not be used to increase burnishing Whenever possible, and for best
The red orientation spot must be force; burnishing force should only results, the tool should be fed
opposite the contact point.) Bring be adjusted with the load adjusting towards the spindle when burnishing
the tool into contact with the part screws.This ensures the tool can be diameters and towards the centerline
to be burnished. fed on/off the part and across when burnishing faces. (Note: the
interruptions without damage to the UBT-B3 tool cannot be used to
Feed the tool another 0.003-0.005 tool or workpiece. burnish faces.)
inch (0.08-0.13mm) into the part to
provide interference between the roll For optimum results and long tool
and part so that the roll will float in life, coolant is required.Any soluble,

ROLLS FOR UBT-B TOOLS

ITEM NO. TOOL TYPE ROLL TYPE & RADIUS
UBT-001 UBT-B1 HARDENED STEEL, .060 IN. (1.52MM)
UBT-002 UBT-B1 CARBIDE, .060 IN. (1.52MM)
UBT-003 UBT-B1 HARDENED STEEL, .030 IN. (0.76MM)
UBT-018 UBT-B2 HARDENED STEEL, .060 IN. (1.52MM)
UBT-019 UBT-B2 CARBIDE, .060 IN. (1.52MM)
6100-708-00312 UBT-B3 HARDENED STEEL, .030 IN. (0.76MM)

Speed and feed recommendations for UBT-T and UBT-B tools

IPR SPEED SFM FEED
0.001/0.006 750
MM/REV. M/MIN.
0.02/0.15 230

Lubrication of UBT-T and UBT-B tools

All UBT-T and UBT-B tools should be periodically greased
(approximately every 24 hours of operation).We recommend
the use of high-quality Lithium complex grease.

59