UNIVERSAL BAT VEHICLE: WELDING, TOOL MAKING, AND SPECIAL TECHNIQUES
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Posted 1/11/2019 5:20:16 PM
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Here is a CNC test to measure accuracy and repeatability of factory / homemade
new and used CNC machines.

CNC Accuracy
How to run a CNC through its paces to check on the accuracy and repeatability of its cuts and controls.

Test with calipers:
1. Cut a 6" circle, measure the radius in each orientation (x and y).

2. Cut a 6" square - inspect 'sharpness' of corners. measure diagonals and lengths.

4. Cut some 6" Diamonds and diagonals. Doing a diamond is a good idea as it checks for any issues with axis "deviations". Sometimes called an axis harmonics test.

3. Set up a dial indicator such that the axis can be jogged back and forth 1/2" about start position to look for slop/backlash.

Be mindful of the difference between accuracy and repeatability. They are very different things. Six inch squares are really good since you can use a standard digital caliper to measure.
The back to back rectangles is a great test. The larger the rectangle the more easily it is to determine if there is not an exact match.


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