SPANNTOP

SPANNTOP
SPANNTOP ® : Systematic clamping
■ outside clamping
■ inside clamping
■ in front of the chuck
02.2007

HAINBUCH. Workholding technology
HAINBUCH manufactures clamping devices. We have been doing it for more than
50 years, and are now in the third generation. The company is headquartered in
Germany. Hainbuch has subsidiaries in France, Italy, Sweden, Thailand, and the
USA. In addition there are several national and international commercial agencies.
The SPANNTOP system developed by HAINBUCH is a genuine classic. It is extremely
easy to handle and convincing in implementation: For example in turning centers
and milling centers, on gear cutting machines and grinding machines, or also on
rotary transfer machines and friction welding lathes. Wherever rigidity, precision,
and ease of change-over are required. This is where the strengths offered by the
modular structure really shine.
With SPANNTOP, one fits into the other: With its different adaptations the
chuck offers an incredible number of clamping possibilities, which not
only optimizes the production process, it also optimizes the balance sheet.
2

SPANNTOP. The original
Drawtube
adapter
SPANNTOP chuck
[pages 4 – 11]
■ combi pull-back for chuck
elements and bar work
■ combi deadlength for work
pieces with short collar
■ modular for bar work
Clamping head [page 12]
■ for clamping of raw material
■ for clamping of
finished material
■ machinable to size
Changing fixture
[page 13]
■ manual
■ pneumatic
■ pneumatic-hydraulic
MANDO Adapt [page 14]
Mandrel-in-SPANNTOP-chuck
■ for I.D. clamping
?
Often copied, never equaled. SPANNTOP is well
thought-out in all the details – from drawtube
adapter to changing fixture. See for yourself:
The advantages of the SPANNTOP
system
■ rigidity
■ concentric accuracy
■ quick change-over
■ circumferential clamping
■ vibration damping
■ axial draw force against the end-stop
Jaw adapter [page 15]
Jaw-clamping-in-SPANNTOP-chuck
■ for clamping in front of the chuck
SPANNTOP . The original 3

SPANNTOP. Chuck types
SPANNTOP chuck
Combi pull-back
With axial fixed end-stop
for chuck elements and a
through-bore capacity for
bar work.
The clamping head pulls
the work piece onto the
end-stop.
SPANNTOP chuck
Combi deadlength
With axial fixed clamping
head and end-stop for
chuck elements and
through-bore capacity for
bar work.
SPANNTOP chuck
Modular
With a through-bore for
bars and tubes.
4 SPANNTOP . Chuck types

Circumferential clamping
Axial force against the end-stop
In particular:
Work pieces can also be
clamped very short.
Circumferential clamping
Radial clamping without
axial movement
In particular:
Work pieces can also be
clamped on a short collar
or shoulder.
Circumferential clamping
Axial tension
Square, hexagon, special profiles
SPANNTOP . Chuck types
5

SPANNTOP chuck combi pull-back
5
When clamping, the clamping head moves axially to the rear,
so that the work piece is pulled tightly onto the fixed end-stop.
Thus even with the shortest clamping lengths very stable work
piece clamping is achieved. Moreover, the segments of the
clamping head act like wedges between the work piece and
the massive chuck body, and thus ensures rigidity of the entire
clamping device, which greatly increases cutting tool life.
1 6
4
2
3
SPANNTOP combi pull-back is ideal
■ as through-bore chuck for bar work
■ as end-stop chuck for chuck work
■ with work pieces that have a short clamping length
1 flange
2 chuck body
3 clamping head
4 torsional safety
5 mounting threads for front end-stop
6 changeable base end-stop [can be
fixed from outside via 3 screws]
The advantages
■ axial draw force against the end-stop, which stabilizes
clamping [important for shorter clamping length]
■ little inertia loss
■ extremely rigid
■ optimal holding power
■ simple mechanics, results in better power conversion
■ clamps work pieces with short clamping length
■ converts to a fully functional »bar chuck« when the
end-stop plate is removed
■ excellent concentricity after clamping head change
[< 0.01 mm]
6 SPANNTOP chuck . Combi pull-back

effective
clamping forces
Material: 18CrNi8 / 1.5920
Depth of cut: approx. 1.0 mm
Feed:
0.25 mm/U
Cutting speed:
100 rpm
Significant time savings thanks to fast processing in the
SPANNTOP chuck without the use of a center, which is
required with a jaw chuck.
chuck
base end-stop
end-stop
work piece
clamping head
Common-Rail injection nozzle
––––––––––––––––––––––––––––––––
Material: 18CrNi8 / 1.5920
Depth of cut: approx. 1.5 mm
Feed:
0.25 mm/U
Cutting speed:
100 rpm
Typical clamping and processing examples
Common-Rail
sun shaft
front end-stop
coolant supply is possible for
flushing or for air sensing control
depth [end-] stop with/without ejector
SPANNTOP Chuck . Combi pull-back
7

SPANNTOP chuck combi deadlength
3 5 6
For this type the clamping head is coupled in the chuck and
there is no axial movement.
Tension is introduced through the axial movement of the connecting
sleeve.
Thus the work piece is clamped radially without axial movement.
An interior base end-stop, or a front end-stop mounted on the
front side, can be used here as well.
SPANNTOP combi deadlength can be used
■ as through-bore chuck for bar work
■ as end-stop chuck for chuck work
■ for work pieces with a very short collar
1
7
2
4
1 flange
2 chuck body
3 connecting sleeve
4 clamping head
5 torsional safety
6 mounting threads for front end-stop
7 changeable base end-stop [can be
fixed from outside via 3 screws]
The advantages
■ radial clamping without axial movement of the clamping head
■ clamps work pieces on a short collar or shoulder
■ converts to a fully functional »bar chuck« when the end-stop
plate is removed
■ excellent concentricity after clamping head change [< 0.02 mm]
8 SPANNTOP chuck . Combi deadlength

The example shows a situation where
the right chuck clamps the part, which is
then cut off.
pull-back
deadlength
Typical clamping and processing examples
A work piece with narrow collar must be
clamped.
Long work piece is pulled forward several
times out of the left chuck and reprocessed.
Thanks to radial clamping only the axial
clearance to the grooves is better maintained.
Work piece transfer with narrow collar is an
ideal application.
short clamping surface
SPANNTOP Chuck . Combi deadlength
9

SPANNTOP chuck modular
1
2
6
1 mounting threads [e. g. for guide rings]
2 mounting threads for front end-stop
3 clamping head with pull-back effect
4 chuck body
5 torsional safety
6 flange
SPANNTOP modular can be used
■ as through-bore chuck for bar work
5
4
3
SPANNTOP modular offers up to 35 % more rigidity and up
to 50 % higher clamping forces than conventional collet
chucks. The axial tension produced during the clamping
process draws the clamping head directly into the chuck body.
On the other hand, when using conventional collets the clamping
force pushes the chuck away from the spindle nose, which
significantly decreases rigidity.
With SPANNTOP modular not only work piece clamping is
highly stable, but there is also a significant increase of rigidity
of the entire clamping fixture. This in turn has a favorable
effect on tool life.
The advantage of SPANNTOP relative to traditional
clamping collet chucks
The clamping force pulls the clamping head to the spindle nose. This
has a significant effect on stability.
SPANNTOP
The advantages
■ actuating force toward spindle
■ parallel/cylindrical clamping
■ optimal holding power
■ very rigid
■ parallel clamping
■ minimal wear
■ easy change-over
■ concentricity < 0.01 mm
drawtube
force
power flow in one direction
compression force
cutting force
Conventional clamping collet chuck
10 SPANNTOP chuck . Modular

SPANNTOP. Numbers and facts
Chuck
Size Test length –––––––––––––––––––– Attainable concentric precision –––––––––––––––––
L –––––––––– Round –––––––––– ––––––– Square/hexagon –––––––
Modular, pull-back Deadlength Modular, pull-back Deadlength
32 30 < 0.01 < 0.02 < 0.04 < 0.06
42 30 < 0.01 < 0.02 < 0.04 < 0.06
52 30 < 0.01 < 0.02 < 0.04 < 0.06
65 50 < 0.01 < 0.02 < 0.04 < 0.06
80 50 < 0.01 < 0.02 < 0.04 < 0.06
100 60 < 0.01 < 0.02 < 0.04 < 0.06
125 60 < 0.01 < 0.02 < 0.04 < 0.06
140 60 < 0.01 < 0.02 < 0.04 < 0.06
>160 80 < 0.01
Clamping range clamping heads
Size —> d.max -> D L S Span Opening- Minimum Counter bore to Drawtube force RPM*
capacity chuck range nominal clamping- max. clamping Ø d max. max.
size length t Depth t
32 BZI 32 75 47 6 ± 0.3 + 0.6 8 mm 49 x 6.5 25 000 N 8000 min. -1
32 BZIG/HSW 32 75 44 3 ± 0.3 + 0.6 5 mm 49 x 6.5 25 000 N 8000 min. -1
42 BZI 42 120 47 9 ± 0.5 + 0.6 11mm 68 x 10 35 000 N 7000 min. -1
42 BZIG/HSW 42 120 42 4 ± 0.5 + 0.6 6 mm 68 x 10 35 000 N 7000 min. -1
52 BZI/BZIG/HSW 52 125 46 4 ± 0.5 + 0.6 6 mm 64 x 9 40 000 N 7000 min. -1
65 BZI 65 145 58 9 ± 0.5 + 0.6 11mm 87 x 10 45 000 N 6000 min. -1
65 BZIG/HSW 65 145 53 4 ± 0.5 + 0.6 6 mm 87 x 10 45 000 N 6000 min. -1
80 BZI/BZIG/HSW 80 160 53 4 ± 0.5 + 0.6 6 mm 93 x 11 50 000 N 5500 min. -1
100 BZ/BZG/HSW 100 215 59 0 ± 1.0 + 2.0 2 mm 117.2 x 20 65 000 N 5000 min. -1
120 BZ 120 240 61 3 ± 1.0 + 1.3 5 mm 150 x 18 70 000 N 3200 min. -1
125 BZ/BZG/HSW 127 250 67 4 ± 1.0 + 2.5 6 mm 167 x 18 70 000 N 3200 min. -1
140 BZ 140 265 63 5 ± 1.0 + 1.3 7 mm 166 x 18 100 000 N 3200 min. -1
160 BZ 160 290 63 5 ± 1.0 + 1.3 7 mm 210 x 12 100 000 N 3200 min. -1
* Data only applies if the standard clamping head version is used.
SPANNTOP chuck . Numbers and facts
11

The clamping head
Standard
[in stock]
Special profile clamping
possibilities
■
■
■
rigid hardened segments
made of chromium-nickel steel
all function surfaces are
ground in one operation
through continuous research
and development our vulcanizing
process satisfies new
market requirements
Modified lead-in-chamfer for
square and hexagon bars
Standard versions
Clamping of raw
material
BZI
Serrated with gear
tooth system
Clamping of finished
material
BZIG
With smooth clamping surface
for clamping on previously
processed surfaces
Machinable to size
HSW
Machining of the
clamping bore to size
loading ring
Special versions
F
Fine tooth serration for
increased grip, e.g. for
drawn material
Z
Rough tooth serration for
increased grip. e.g. for
rolled material
12 The clamping head

Clamping head change-over
Set-up for ø 60 mm Remove clamping head Clean Insert clamping head Set-up for ø 65 mm
Our convenient changing fixtures let
you change clamping heads in a flash.
1. Manual changes
The manually actuated EasyGrip MQ
changing fixture is the simplest
change-over method.
EasyGrip MQQ is especially designed
for applications where workspace is
tight.
2. Pneumatic changing unit
The pneumatically actuated PP changing
fixture is absolutely convenient with
its comfortable handle and integrated
valve button.
chuck clamping head changing fixture
The PPG pneumatic changing fixture
has 2 additional handles.
Note: Changing fixtures can be used
for any clamping diameter for the relevant
clamping head size, regardless of
clamping diameter.
MQ
MQQ
PP
PPG
Clamping head change-over
13

MANDO Adapt. Mandrel-in-SPANNTOP-chuck
set-up without alignment
draw bolt
Mandrel size
Chuck size
Clamping range
of the mandrel
[mm]
Span [mm]
This mandrel-in-chuck offers convincing performance,
long-lasting power, and unusual speed. It is unsurpassed
by any jaw chuck. In terms of the time savings
offered by the MANDO Adapt, they do not even
come close. A top-class internal clamping fixture.
The advantages
■ change from O.D. clamping to I.D. clamping in
less than 2 minutes – without taking the chuck off
the machine
■ high attainable concentricity without alignment
[< 0.005 mm]
■ five different mandrel sizes – each available for
chuck sizes 42 – 100
0
1
2
3
4
42
52
65
80
100
42
52
65
80
100
42
52
65
80
100
65
80
100
65
80
100
ø 20 - 28
ø 20 - 28
ø 20 - 28
ø 20 - 28
ø 20 - 28
ø 26 - 38
ø 26 - 38
ø 26 - 38
ø 26 - 38
ø 26 - 38
ø 36 - 54
ø 36 - 54
ø 36 - 54
ø 36 - 54
ø 36 - 54
ø 50 - 80
ø 50 - 80
ø 50 - 80
ø 70 - 100
ø 70 - 100
ø 70 - 100
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.25
± 0.35
± 0.35
± 0.35
± 0.40
± 0.40
± 0.40
Fast and easy change-over
Remove clamping head Install MANDO Adapt Mount segment bushing Screw in draw-bolt Mount the end-stop blank
Mount MANDO Adapt on the front side of the SPANNTOP
chuck and you are ready to go. The mandrel is then adapted
with < 0.005 mm runout. When the draw bolt that is needed
for the actuation of the segmented bushing is screwed on, a
slick mechanism will spread and adapt to the coupling that
normally grabs the clamping head.
14 MANDO Adapt . Mandrel-in-SPANNTOP-chuck

Jaw adapter. Jaw-clamping-in-SPANNTOP-chuck
block jaws for
machining
hexagon socket wrench
base end-stop
Chuck size
65 80
Now you can also clamp in front of the chuck with
the SPANNTOP combi pull-back with axial bolted
base end-stop and the jaw adapter. A combination that
opens completely new possibilities that previously
needed another jaw chuck.
The advantages
■ clamp in front of the chuck – without a second
clamping setup
■ significantly larger clamping diameters can be
realized
■ drilling or milling in-between the jaws
■ chuck jaw with serration, clamping diameter adjustable
by 6 mm
Attainable concentric precision
at 35 kN measured
50 mm from the front edge
of the jaw [in addition to
the concentricity of the
main clamping unit]
Max. permissible jaw
machining depth on the jaws
Max. permissible jaw machining
diameter on the jaws
Swing dia. over bed [mm]
Jaw height [mm]
0.03 mm 0.03 mm
20 mm 20 mm
120 mm 133 mm
146 mm 146 mm
39.5 mm 39.5 mm
Fast and easy change-over
Remove clamping head Install base end-stop Insert jaw adapter Fixed in place via the
central bolt
Jaw ready for machining
A changing fixture is not required when using the jaw adapter.
A central mounting screw pulls the support taper onto the base
end-stop, and in the process spreads the segments in the chuck
coupling. The support taper prevents the jaw adapter from
tipping and thus ensures that it retains its strong clamping
force.
Jaw adapter . Jaw-clamping-in-SPANNTOP-chuck
15

| Concept and design: ABSICHT AG www.absicht.ag | Photography: Andy Ridder www.andy-ridder.de |