1551 S. Harris Court,Anaheim, CA 92806
Phone: 714.978.1551
Fax: 714.978.0431

Model 3400E Series, Automatic, Overhead, Large Area Wedge Bonders Last revised: 11/08/2005


Model 3400E is a gantry with overhead ways and a moving and rotating bond head that brings the bonding function to the work and leaves the material handling process flow under customer control. It uses the full 2400B Series software to locate and bond automatically fine wire connections arrayed over a large, stationary work piece. There is no limit to the size of the work as this machine is entirely above the bond plane. The area traversed for bonding is six by eight inches; and successive areas could be presented. Bonding method is convertible between angled-feed or vertical-feed wedge bonding by exchange of clamp assemblies.

This machine follows a programmed path to all the targets across the bond area; locating each target by Pattern Recognition and correcting for placement error. Wedge bonding with fine aluminum wire usually does not require work piece heat. The (preferred) method of wire feeding with angled clamps is the most reliable method for continuous bonding, but vertical feed method is available by simple conversion when deep walls limit access.

Programming of the work path makes use of the fully developed and richly featured software from West Bond’s Model 2400B running under Windows. Interface is by keypad, mouse, and large LCD color display.


Bonding mechanism is constructed of three axes, straight-line and orthogonal, all driven by stepper motors in micro-step mode under program control. The long "X" and "Y" axes are moved via lead screw, and the "Z", by a linear spiral cam. A fourth motor drives the television camera assembly in "Z" direction for focus. Two additional motors serve to rotate the bond head and to drive the wire clamp assembly, all through the same bond head pivot. Wire is fed through the hollow pivot shaft from a spin-off 2-inch spool mount. Detection of broken wire functions without work contact to halt bonding.

All movement ways are hardened and ground vees with crossed rollers. The lead screws are positioned outside the ways, so to be accessed for maintenance without disassembly. Fine accuracy is assured by closed-loop feedback to the motor controls from an optical encoder system with glass scales and laser sensors mounted within the X- and Y-Axes.

Ranges, Ratios and Resolutions

Bond "Y"


6.000 inches



0.0001 inch per encoder division

Bond "X"


8.000 inches (plus offset)



0.0001 inch per encoder division

Bond "Z"


0.500 inch



0.0001 inch per motor micro-step

Offset "X"


1.500 inches, making total "X" range, 9.5 inches

Bond Tool Head Assembly

The bond head rotates through +/- 180° to align wedge bond targets front to back, with all rotating mechanism moving on the "Z" axis. The transducer and wire clamps are mounted on a four-bar linkage so the tool remains vertical and can be extended down to any position that tunes ultrasonically. Change between angled feed and overhead feed is by the exchange of clamp assemblies and wire drag means.

In standard arrangement, the extended tool provides clearance of 0.3125 in. adjacent the angled wire clamps, and 0.46875 in. everywhere else above the work plane.

All clamp motions are motor driven via a cam on a shaft concentric with the main pivot

Bond Force is set to program values by a linear actuator driven pressure-regulating valve. This pressure acting on a leaky piston generates force with little mass. The piston force is opposed by a constant spring that serves to hold closed firing switch contacts when air is turned off during high-speed runs.

The Tool Head of this series is built around K~Sine Transducer, Model No. 24-RW, one half wave in length, operating at a nominal frequency of 63 kHz. Radiant tool heat with constant current control is included.

Machine Configuration

The mechanism of this series was designed to mount above a customer's work handling system, to be confined entirely above the work plane, and so not to require any base or work platform: Custom mounting brackets can be designed to join to customer’s mechanism. This configuration is designated by the appended "X", as Model 3436EX. For tabletop application, the standard model of this Series, Model 3436E, is without any work holder or temperature controller. The floor-standing configuration becomes Model 3436E-90 by the addition of Feature –90, Frame. In any configuration, the Industrial Computer CPU Chassis and West·Bond’s Power Supply Chassis are housed as separate components.

A motorized wire de-spooler, Assy No 10065, for 2-inch spools, is mounted on the Y-Axis.

A unique utility to detect bond fault is included, so to halt immediately to prevent damage to subsequent bond sites: This truly enables the bonding of large, multi-wire work pieces.

ESD protected Olympus Model SZ51-60 Microscope with 15X eyepieces and the new LED illuminator "Luxuray" are included. No other microscope has equivalent clearance to the bond head. This microscope is mounted on a folded linkage that allows it to be positioned to view most of the bond area.

Electrical Software and Hardware

A software control program, well developed and in long use for West Bond Model No. 2400B, is adapted to serve this model as well. This program runs under Windows XP Professional and is executed by a Pentium 4 processor housed in an Industrial CPU enclosure. Pattern Recognition is accomplished by Matrox components. The User Interface is displayed on a large LCD color display, and consists of many screen forms that also include a display of the work piece targets. Input controls require a mouse, a keypad and a control-switch pad. User data of machine configuration, and of device targets and image patterns, can be saved to 128MB (or greater) USB Drives, Hard disk, or Floppy disk.

The separate power supply enclosure holds motor and logic electrical power supplies, and also K~Sine ultrasonic power supply; Part No. 6795 for 63kHz, or No. 9060 for 110kHz. Settings of power and time program values are sent via an eight-bit interface.


ESD Protection

Protection against Electrostatic Discharge is implemented by finishing exposed tool assemblies and other moving parts by Electro less Nickel plating, which is conductive; and all exposed painted parts with a powder-coated paint that is dissipative.

Definitions of Models of this Series:

  • Model No. 3436E. This machine with tool assembly No. 9376 for Wedge Bonding at ultrasonic frequency of 63 kHz, with both angled and vertical wire feed clamps. There are no optional Features.
  • Model No. 3436EX. This machine for 63 Khz, but less Base, Adjustable Platform, and Work Holder.
  • Model No. 3436E-90. This machine for 63 Khz, including Feature –90, Floor-Standing Frame.
  • Model No. 343630E. This machine with tool assembly No. 9755 for Wedge Bonding at ultrasonic frequency of 110 kHz, with both angled and vertical wire feed clamps. There are no optional Features.
  • Model No. 343630EX. This machine for 110 Khz, but less Base, Adjustable Platform, and Work Holder.
  • Model No. 343630E-90. This machine for 110 Khz, including Feature –90, Floor-Standing Frame.

Features and Accessories Available for this Series:

  • Feature No. –9640 Adjustable Height Work Platform.
  • Product No. –10177.04 Large-Area Heated Work Station with drop-in work piece adapter. Requires addition of Feature –9640.
  • Product No. K~1201D Temperature Controller.


Compressed air, regulated to 50 psig, is required. Connection is via 1/4-inch tubing.

Electrical service required is 50-60 Hz, single phase, either 115 VAC or 230 VAC; however, input must be configured at the factory for 230 VAC. A fuse and three-prong power cord connector are provided for 115 VAC: For 230 VAC, these must be changed to conform to local requirements.


Machine dimensions are shown on the drawings below.

Weight is 410 lb. uncrated, or 450 lb. crated.


Side View

End View


Model No. 3400E-90

1551 S. Harris Court,Anaheim, CA 92806
Phone: 714.978.1551
Fax: 714.978.0431

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