Careful Selection In A Telescopic Cylinder Jan10

Careful Selection In A Telescopic Cylinder...

One of the limitations of standard types of hydraulic cylinders is the limit of the stroke or the extension of the rod from the cylinder. In standard cylinders, the length of the stock is less than the overall length of the cylinder body, which creates a problem when longer extensions are required. To work around this limitation, telescopic cylinders use stages or sections that fit into each other when retracted and that lift out from each other when extended. This allows the overall stroke length to extended significantly, adding the desired height or length for lifting types of applications. Considerations With a standard cylinder, it is important to ensure the load capacity of the cylinder is not exceeded to extend the life of the system. With telescopic cylinders, lifting or pushing at overloaded capacity can result in bending and twisting of the stages, creating provides in retracting the stages and seating back into the cylinder. The length of the cylinder and the number of stages is always an important consideration in the design. The stages are larger at the base and become smaller at the top, which is an essential component in the design process. Most of these types of cylinders are designed with six or fewer stages, but it is possible to increase the number of stages with some specific design options. The most common types of telescopic cylinders are single acting. These cylinders operate as the pressure from the hydraulic port at the bottom extends the stages. The removal of the pressure by the equipment operator allows the stages to retract from the weight on the equipment (gravity) and the loss of pressure. There are also double-acting telescoping cylinders. As these are more complex to design and require additional seals and configurations...

Advancements in Drilling Operation Nov05

Advancements in Drilling Operation...

CNC stands for Computer Numerical Control and has been around since the early 1970’s. CNC has touched almost every form of the manufacturing process in one way or another. These machines typically replace or work in conjunction with some existing manufacturing processes. Take one of the simplest manufacturing processes, the drilling operation, for example. Using a Drill Press A drill press can be used to machine holes. There is a lot of manual intervention required to use a drill press to drill holes. A person is required to do something almost every step along the way. While this manual intervention may be acceptable for small manufacturing jobs, greater quantities require greater drilling operation methods. Using a Machining Center By comparison, the CNC equivalent for a drill press can be programmed to perform this operation in a much more automatic fashion. Everything that the drill press operator was doing manually will now be done by the CNC machine, including: placing the drill in the spindle, activating the spindle, positioning the workpiece under the drill, machining the hole, and turning off the spindle. CNC Promotes Precision CNC machines perform a wide variety of drilling operations. A machine can be programmed to turn a part, and drill cross holes on or off center, as well as in either face of the part. CNC machining companies offer numerous drilling options and sizes. After the drilling operation, machines can also be programmed to tap, bore or thread mill depending on the job requirements. CNC Promotes Efficiency Everything that an operator would be required to do with conventional machine tools is programmable with CNC Machines. Once the machine is setup and running, a CNC machine is quite simple to keep running. With some CNC machines, even the workpiece loading process...