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http://www.cwhdallas.com/axis-indexer/
Axis Indexer
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CNC linear controller w/ stepper motor
Sale Price: $450.00
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The programmable controller is essentially a stepper motor driven power feed for any axis of your Sherline CNC-ready lathe or mill. The driver box contains a programmable chip that uses simple commands entered from its own keypad to control speed, direction and stopping points of your lathe or mill. Speed is programmable from 1 IPM to 25 IPM, and distance is programmable in .0005 increments. Backlash compensation is also programmable. Two or more units can be daisy-chained together for sequential operations. It can work with another 8800 controller or with the 8700 rotary table controller for operations like full automation of cutting gear teeth. Two programs of up to 40 steps with 4 parameters per step (speed, distance, direction and stop/wait for signal) are available. An LCD readout on the control box gives you current position and prompts you for programming commands. Included is a 120 VAC power supply. (NOTE: Available in inch version only, no metric or 240 VAC version available at this time.)
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Rotary tables are used in the precision metalworking industry. It is made of a solid base that can be clamped on to the other fixture. In simple words, rotary tables are discs, which rotate freely or by using a worm (hand crank).
Rotary indexers are used in different applications like machining, assembly and automation. Other than this, these tables find usage in assembly and equipment positioning. When you are buying a rotary indexer, there are a few things to consider. These include:
Diameter of Rotation Dial
The worktable diameter is the surface area of the rotary indexer.
Measurement of Through-Hole Diameter
It is the diameter of the breadth of the hole present at the center of the workstation.
Maximum Radial Load
When the load is pushed against the rotating plate, the heaviest amount it can support on vertical or horizontal axis is the maximum radial load.
Maximum Axial Load of Rotary actuator
Maximum weight the actuators are able to bear at the time of concentric operations.
Actuator Speed
Maximum rotation speed set b the manufacturer.
Minimum Indexing Increment
Smallest angle setting on the table.
Rotary tables can be mounted in horizontal, inverted or vertical styles. When the table is mounted horizontally, it is in a flat, horizontal and upright position. In vertical mounting, surface of the table runs up and down. When it is inverted, the table is upside down in a horizontal angle.
The location of drive on rotary table depends on the mount. You can place the drives below, behind, on the top or on the side of the table. When the drive is mounted horizontally, it is located above the surface of the table. When the table is mounted horizontally, the side-mounted drive is placed to the side of the surface of the table.
The rotary table can be driven manually, pneumatically, hydraulically and electrically. If you are driving manually, the table should be loosened and it must be turned manually with the crank.
For more information about rotary table construction read http://www.intellidrives.com/info/AppNotes_rotary_tables_Glossary.htm.html
Selection of Right Axial Fan for Ventilation
In a typical axial fan, the effective progress of the air is straight through the impeller at a constant distance from the axis. The primary component of blade force on the air is directed axially from inlet to outlet and thus provides the pressure rise by a process that may be called direct blade action.
The blade force necessarily has an additional component in the tangential direction, providing the reaction to the driving torque : this sets the air spinning about the axis independently of its forward motion.
The air delivering capacity of axial flow fans ranges from 100 to 500,000 cubic feet per minute (3,000 to 15,000 cubic meters per minute). Impellers usually have blades with airfoil cross-sections.
As compared to curved sheet blades, aerofoils can apply greater force to the air, thereby increasing maximum pressure and can maintain better efficiency over a wider range of volumetric flow. Also by increasing the thickness & curvature of the inner sections, the blades can be made stiffer, this limits flutter and allows the impellers to be run at higher speeds.
Selection of a a right fan one should consider such factors like cost optimization, power rating & noise levels govern the selection of a fan suitable for a given application. Various combinations are possible to meet any given duty or operating requirements for best performance, lesser noise, power and cost characteristics.
Once the volume of airflow and the static pressure of the system are known, it is possible to specify a fan. The governing principle in fan selection is that any given fan can only deliver one flow at one pressure in a given system. To select a fan one must consider the following parameters:
- total airflow required
- total operating pressure
- fan installation space
The fan efficiency is defined as the ratio of air power (output) to shaft power requirement (input). An optimally designed fan impeller with improved aerodynamics requires less shaft input power for desired delivery of air volume with total pressure rise as per the system requirement. With reduced shaft power requirement, there is a commensurate reduction in energy consumption.
Thus the fan efficiency is directly contingent upon selection of fan and the operating point relevant to the system resistance.
The way fan impellers (blades or rotors) are designed, the amount of air they can move decreases as the pressure they are working against increases.
The airflow vs. pressure information for a particular fan is called the fan performance data. The performance of a fan depends on the size, shape & speed of the impeller. The fan performance data is essential for selecting fans as per the desired airflow and system pressure.
Most fans are tested using procedures specified by Air Movement and Control Association International Inc. (AMCA), Illinois, USA. The fan under test is mounted near the outlet of the test rig and air in-flow through the rig is varied by the movable gate assembly situated at the other end of the test rig.
The airflow through the rig is determined by measurement of the pressure differential and simultaneous readings are taken of the static pressure developed by the fan, air velocity at the exit side, power consumed by the fan driving motor etc.
Fan performance curves and data show how much pressure and airflow a given fan can produce at a given speed. This data is based on the system resistance (pressure) occurring away from the fan. Fan performance curves are developed by fan manufacturers based on the testing of a prototype fan fabricated based on the theoretical design.
The axial flow fans are widely used for providing the required airflow for heat & mass transfer operations in various industrial equipment and processes. These include cooling towers for air-conditioning & ventilation, humidifiers in textile mills, air-heat exchangers for various chemical processes, ventilation & exhaust as in mining industry etc. All the major industries use large number of axial flow fans for operations, such as :
- Power generation
- Petroleum refining & petrochemicals
- Cement industry
- Chemicals & pharmaceuticals production
- Fertilizer production
- Mining manufacturing
- Humidification in textile mills
- building Ventilation, etc..
For additional information please refer to http://canadianblower.com/fans/index.html.
Susan Terlitski
Canadain Ventilation Systems Designer / Engineer
Canadian Blower
http://canadianblower.com/oem/index.html
http://canadianblower.com/news/index.html
About the Author
Susan Terlitski
Canadain Ventilation Systems Designer / Engineer
Canadian Blower
http://canadianblower.com/oem/index.html
http://canadianblower.com/news/index.html
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