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Variations in workpiece material and/or cutting tools will often require operators to change cutting conditions (mostly spindle speed and feed rate) during a production run. Most manufacturing companies do allow their CNC people to make these changes as they are required to do so.
All current model CNC controls allow offsets to be changed during the execution of the CNC program. That is, operators can change an offset during a production run while the machine is running.
Most machining center programs require but one offset per tool. When it comes to tool length compensation, for example, most applications require that you use one tool length compensation offset for each tool.
In value added terms, there are only two tasks occurring in any business—value added tasks and necessary support tasks. Value added tasks further the completion of a product.
It's been over a year since the column with this title appeared in Modern Machine Shop (January 1999). In it, I addressed how we can change the perceptions of the general public about manufacturing and encourage young people to enter this field.
In a previous column I gave some custom macro B techniques for testing offset values for correctness. But the previous column required that the cumbersome commands related to testing offset values be included within the main program.
Machine tool builders can provide special interpolation types based upon their customers' specific needs. Some three-axis (X, Z and C) turning centers, for example, are equipped with live tooling.
Fixture offsets are used on machining centers to assign program zero. Most controls come with a limited number of fixture offsets (Fanuc provides six fixture offsets as a standard number).
You know that all current model CNC controls have some very important program verification functions. Dry run, single block, feed hold, feedrate override and rapid override are among the most helpful functions when it comes to determining what might be wrong with a given program.
I thought that program was proven! Many manufacturing people, especially upper management, feel that if a program has been verified and has been used to successfully complete one production run, there should be no problems when running the job in the future. In reality, any number of things could be different the next time a job is run.