Changes between Initial Version and Version 1 of Hand/282/SystemComponentList

Jul 10, 2013, 9:23:16 PM (9 years ago)



  • Hand/282/SystemComponentList

    v1 v1  
     1= BH8-280 System Components =
     2== In the Box ==
     3 * BarrettHand Shipping Case
     4 * BarrettHand BH8-280 (B3892)
     5 * Threaded Aluminum Ring for base (B2211)
     6 * Universal Power Supply - 48V (B4062)
     7 * BarrettHand BH8-280 Maintenance Kit
     8   * Acrylic finger angle fixture (B3729)
     9   * Grease (Mobil 1) in syringe
     10   * Small packet of Threadlock
     11   * Tweezers
     12   * Dental Tool
     13   * Hex Wrench Kit
     14   * 2mm Hex Driver, Wiha brand
     15   * Phillips Head Screwdriver, Wiha brand, size PH1
     16   * Flathead Screwdriver, Wiha brand, size 2
     17 * Torque Wrench (B3436)
     18 * Plexiglass Stand (B3978)
     19 * Sheet metal Adapter Mount (B1402)
     20 * USB-to-CAN Converter (B5382)
     21 * USB-to-Serial Converter (B5397)
     22 * USB Flash Drive (B3977)
     23 * BarrettHand External Cable (B5442)
     24 * AC Power Cable
     25 * Serial Cable
     26 * Barrett Technology DVD
     27 * Business Envelope
     28 * Quick-start Sheet
     30== Additional Information ==
     31=== The Hand ===
     32The !BarrettHand™, shown in Figure 1, has three fingers labeled F1, F2 and F3.  Two of the fingers, F1 & F2, rotate synchronously and symmetrically about the base joint.  The “spread” motion around the palm allows “on-the-fly” grasp reconfiguration to adapt to varying target object sizes, shapes, and orientations. 
     34Aside from the spread motion, each of the three fingers on the !BarrettHand™ feature two joints driven by a single DC brushless servo motor.  The joints of each finger are coupled through Barrett’s patented !TorqueSwitch™, which automatically switches motor torque to the appropriate finger joint when closing on a target object.  Using the fingers together allows the !BarrettHand™ to "grasp" a wide variety of objects securely.  The !TorqueSwitch™ combined with the spread function, makes object grasping nearly target-independent.
     36The !BarrettHand™, shown in Figure 1, is equipped with a threaded base for compact and secure mounting.  The threaded base is fully compatible with the WAM Arm. And, with the arm adapter, it can be mounted on virtually any robot with a standard ISO tool plate, for easy installation and maintenance.
     39#!div class="center" align="center"
     42'''Figure 1: !BarrettHand™'''
     45=== Power Supply ===
     46The BH8-28x power supply shown in Figure 2 is compact and designed to run a hand from a host computer over serial or CAN.  The user should connect all wires which connect to the power supply before turning on power.  A control switch sets RS-232 or CAN mode and accepts control input from the same DB9 connector.  The unit is powered through an AC line cord and provides all the necessary power to the hand.  Internally, an industrial grade power supply called the Synqor !AcuQor provides a semi-regulated 48 V to power the hand.
     48CAUTION:  Do not try to power previous hand models with this power supply because earlier models were limited to 24 V.  Never provide RS-232 signals while in CAN mode because it can cause damage to the electronics.
     51#!div class="center" align="center"
     54'''Figure 2 - !BarrettHand™ BH8-28x 48-Volt Universal Power Supply'''
     57=== Electrical Cables ===
     58All necessary electrical cables are included in the basic BH8-282 System. The required electrical connections are shown in Figure 2. An AC Line Cord connects the Power Supply to a wall source. A DB9 Extension Cable provides the communications connection from a host computer via RS-232 serial or CAN. A Hand Cable for the particular Power Supply and !BarrettHand™ supply communications, logic power, and motor power.  This cable is durable and flexible, allowing the !BarrettHand™ to be used on any robot with minimal effect on robot performance.  Use the included set of adhesive guide clips for cable management. Since the control electronics reside inside the !BarrettHand™ itself, no other electrical cabling is required.
     60The typical connection to BH8-282 systems use a Peak USB to CAN adapter that connects to a DB-9 extension cable and the BH8-28x power supply, which is shown in Figure 3.
     63#!div class="center" align="center"
     66'''Figure 3: USB to CAN Adapter for BH8-280 !BarrettHand™'''
     68=== Lab Bench Stand ===
     69The bench mount stand for the !BarrettHand™, shown in Figure 4, is ideal for off-arm development.  The durable Aluminum stand comes complete with cable management clips and mounting features to hold your !BarrettHand™ unit securely on any flat surface.  Non-slip rubber feet keep the stand from sliding during testing and programming.  A threaded locking ring for base mounting will secure the hand to the stand.
     72#!div class="center" align="center"
     75'''Figure 4: Lab Bench Stand, multiple wiring options'''
     79=== Control Software and Firmware ===
     80The BH8-SERIES System control software consists of:
     81        1. !BarrettHand™ Control GUI application and API,
     82        1. Firmware (latest *.tek file), and
     83        1. Example and demo programs.
     85!BarrettHand™ Control GUI
     86The !BarrettHand™ Control GUI is a cross-platform compatible Windows/Linux application that allows control of the !BarrettHand™ quickly and easily.  The !BarrettHand™ Control GUI can be used to demonstrate functionality, test Supervisory and !RealTime control sequences, and how to save those sequences as ASCII text or even as cross-platform compatible C++ code along with a Makefile (literally with the click of a “Generate C++ Code” button).  See the !BarrettHand™ Control GUI Manual for more information on the using this application and the requirements.
     88C++ Function Library
     89The !BarrettHand™ C++ Function Library is an API for programming the !BarrettHand™ using the C++ language on IBM-compatible PC’s without having to manage various communication and timing issues. The library contains a hand control class that has easy-to-use functions that permit the use of Supervisory and !RealTime commands in software developed by the user.  All of the functions are available when the library and its dependencies are linked to the program.  Dependencies are usually installed by default so the user can focus on development. The C++ API includes HTML generated documentation that describes all of the classes, variables, and methods that users should use in detail and gives examples.
     91The API is written in C++ and compiled for 32-bit versions of Ubuntu 9.10 and Windows XP. It is a typical C++ library, providing a class from which you instantiate one BHand object and use it for all communications.  The library uses a multithreaded mechanism for sending commands, which allows both synchronous and asynchronous access to the low-level thread and ensures that all communications are executed with high priority. The low-level thread manages all input and output buffers and makes controlling the !BarrettHand™ easy.
     94The !BarrettHand™ has firmware that resides on the control electronics inside the palm. The firmware is a compiler generated text file that may be uploaded to the hand through the boot loader and the configuration tab in the GUI.  The firmware receives commands, controls the motors, sets and retrieves properties, and reads or writes to the EEPROM.
     96== System Options ==
     98=== Arm Adapter ===
     99Barrett Technology provides an arm adapter (Figure 5) matching the make and model of any robot specified by the customer. This lightweight arm adapter is made to work with the end-effector bolt pattern on your robot, allowing quick, easy mounting and wire management for a BH8-SERIES System. The arm adapter is bolted to the end of the robot arm and the !BarrettHand™ is secured to the arm adapter with its standard threaded locking ring. The arm adapter is also equipped with an anti-rotation feature to prevent rotation during operation.
     102#!div class="center" align="center"
     105'''Figure 5: Arm Adapter'''
     108=== Fingertip Torque Sensing Option ===
     109Barrett Technology offers a set of three factory-installed torque sensors (one per finger) for the !BarrettHand™ system. Each sensor measures the torque externally applied about the distal joint over a range of +/- 1 N-m. This option uses strain-gages to measure the differential tension in the "tendon" running through each finger to the second joint. The information is processed in additional on-board circuitry when this option is installed, it is accessed by requesting the present strain-gage parameter. The strain-gage parameter represents the amount of strain on the strain-gage sensors (values can be calibrated by the customer to relate strain to joint torque).
     111=== Tactile Sensing Option ===
     112The !BarrettHand™ with Tactile-Sensing provides 96 cells of tactile-array data spread across all three fingers and the palm. The density of cells becomes higher towards the very tips of the fingers where finer spatial resolution is desirable. The entire
     113Tactile-Sensing option is seamlessly integrated with the BarrettHand mechanically, electronically, and in the firmware and software. Furthermore, the calibration data is stored with each fingertip and the palm so that if you swap fingers, for example, the
     114system is intelligent enough to maintain the correct calibrations.