What is the difference between relative and absolute on a CNC control?

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Written by Josh on February 17, 2009 – 10:55 am -

This is the CNC milling machines and their control system.

One Response

By Chuckee on Feb 18, 2009 | Reply

The coordinates is a point where the position is now to where you want to go. The absolute is to move to a new location by an absolute zero on the machine. Example: Lets say you are currently sitting inside to reset the X, Y and Z you need to move towards x5.0, Y5.0 and then Z5.0 to X8.0 Y8.0 Z8.0 and then back to X, Y , Z zero. In programming look like this: X5.0 Y5.0 Z5.0 (sit down for this next stage of your position is on the increase your position below) X3.0 Y3.0 Z3.0 (now you have moved on an increase over last position) 8.0 X-Y-Z 8.0-8.0 (new beginning) In absolute programming the same movement looks like this: X5.0 Y5.0 Z5.0 (position 1) X8.0 Y8.0 Z8.0 (position 2) X0.0 Y0.0 Z0.0 (position again at 3) Human beings tend to think in terms related incremental. When given directions that drive is always in relative terms, goes north 1 miles (kilometers) from there go to east 2 miles (kilometers), and so on. In the CNC program it is much easier to program in an absolute way because always know where you are just close to examine the current order FROM ABOVE zero on the machine. In programming should add or subtract all movements prior compute out to where you are. ] -) Good luck, .