Peek at FERMAT Quality Control Department, Vol. 2

A machine is only as accurate as its parts. However, putting it all together also plays a vital role in the final accuracy.
But with machines, there will always be errors and we have to distribute it into multiple assemblies. During geometry check, we follow a protocol and measure it step by step. We individually measure straightness, squareness, or runout. If deviations are within limits, we are good to go.
However, to measure all these deviations simultaneously, you’ve got to have the BALLS! - for detailed diagnostics, we use two devices and the first is called Ballbar. It is an accurate linear sensor, which we use to measure circular interpolation. It consists of two precise balls, one at each end and with a bar in between.
The balls are mounted in place by magnets, one is mounted on the table and the other on the spindle. This arrangement enables the ballbar to measure minute variations in radius as the machine follows a programmed circular path around the mount on the machine table.
We repeat the measurement six times - twice for every plane of 3D space, plane XY, YZ and XZ. The data collected is sent to a PC, where the software calculates overall measurements. Their output is a graph, which gives us information about the mechanical and geometrical condition of the machine.
The second device is a laser interferometer. We use it to increase positioning accuracy of the machine. Position of individual axes - X, Y, Z and V, is measured by linear scales. We program the machine to move into a certain position, step by step and then compare the distance with values measured by the laser. If necessary, we recalibrate linear scales to make the machine as accurate as possible.
The output of both measurements - ball bar and laser, tells us whether the machine is in need of any mechanical correction, exchange of part, or software compensation. It helps us to achieve guaranteed standards of the VDI norm. (VDI/DGQ 3441)

00:00 Intro
00:21 Measurements of geometry protocol
00:46 The balls of ballbar
01:55 Linear scales and laser interferometer
02:53 Why we do this
03:10 NAS piece machining
03:58 Outro

Learn more about FERMAT machines at: https://www.fermatmachinery.com/en​
Watch more Fermat videos at: https://www.youtube.com/user/FermatExport

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