Quote Originally Posted by JAZZCNC View Post

Yes, it is and I may just read this thread completely to see how you have validated that your setup is actually accurate because from the little I've read I'm seeing references to measuring against steel rules, etc and I've yet to see or own steel rule that is straight to micron levels.!

Unless you validate using calibrated measuring devices then you cannot possibly claim your accurate to micron levels. Because no matter how good the idea or wish it to be or fool self into thinking it is accurate, only a calibrated validation speaks the truth.

I know this only too well because as I've got deeper into building machines I've invested in better measuring devices and calibrated granite surfaces plates etc and for several years I believed my really expensive engineer's squares were square, right up till the day I bought my calibrated granite triangle.!!
Hi Dean,

Maybe read the whole thread mate, it shows various calibrations of the line optics used against beams of light which travel in straight lines and also some other tests by other forum members, it does rely on the 3um pixel pitch of the cmos image sensor not being too variant across the sensor, not able to calibrate that I'm afraid.

Anyway suffice to say I agree you don't have do use or understand optical metrology, diy or otherwise, to build a working router, I haven't used it with any of the other machines I have built and all worked fine, although my mate does use a commercial optical kit to align his machining centres, but he builds stuff for F1.

Conversely if you want to measure your machines that you have built then download the software and have a play.

What is the DIN 876 grade standard of the surface plate you use?

Cheers, Joe