On Tue, Sep 25, 2018 at 1:04 AM andy pugh <bodge...@gmail.com> wrote:
> I can't help thinking that the way to determine the amount of > correction needed is to actually machine a test bar and measure it. > A laser beam is straighter than any bar. and is quicker and costs less. What you do is place a camera in the tool holder and watch the beam move as you move the carriage. You can measure at the micrometer level typically 1/10th the pixel size. We live in a time when "nuts" level measurements is easy and cheap. for example: I just bought a pair of BMP280 barometer chips on eBay for $6. I have a live graph on my iMac showing the air pressure vs. time. The chip is simple, just an I2C serial output. I can see the plot on the screen move as I move the chip up and down. Clearly I see that the air is thinner 10 inches above my desk then it is 2 inches above my desk. It is a sensitive altimeter for $3. Upstairs I have an oscillator that runs at 10.000000000000 Mhz and all 13 of those zeros are significant. I have about $100 invested it that if you count all the parts. > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1916 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
