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General Category => Maths, Geometry, Physics and others => Topic started by: BigB0$$ on September 20, 2008, 15:00:04 PM

Title: Ball bar test
Post by: BigB0$$ on September 20, 2008, 15:00:04 PM
I have heard that some technicians for cnc uses the ball bar test to see how accurate is the cnc.

This ball bar test i have found some but no one will explain how to operate and what results may you get. Has anyone use this ball bar tester and explain me how this will measure accuracy?
Title: Re: Ball bar test
Post by: spic0m on September 20, 2008, 19:27:45 PM
Ball bar test is used to collect data from axis when making circular movement and show if there is any deviation. From the graphs produced you can determine many flaws such as: servo mismatch, axis reversal spikes, lateral play, vibration and many more. It's a delicate test and requires lots of practice to ensure you can "decode" the graphs to find the problem. Below is an "official" explanation: http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=6570539
Title: Re: Ball bar test
Post by: BigB0$$ on October 07, 2008, 22:41:25 PM
I really try to understand but i do not. Is there any picture or video of this?
Title: Re: Ball bar test
Post by: spic0m on October 08, 2008, 20:13:16 PM
How ball bar looks you can see here (http://www.helmel.com/Acc/BallBar.htm), for a pict or video working you'll have to wait 'till i got mine ;).
Title: Re: Ball bar test
Post by: kam on October 11, 2008, 14:53:11 PM
where is the video?
Title: Re: Ball bar test
Post by: spic0m on October 11, 2008, 17:16:15 PM
What video, i said wait 'till i got my own.