glass cutting by milling

[osamuel]

hi folks!

i am testing a 14 mm cnc diamond finger just ordered from china (see photo).
intention is to build home made amorphic shapes cutting tool .



my router is up to 25k rpm (its rather used and might have little freedom on its spindle)


the glass is 8mm deeped in water tank (1 cm under water surface) and the finger approaches from side of horizontal sheet .which is clamped sofltly.


so far my problem is chipping.


i am not sure if its speed issue , pace issue , or maybe cooling (there is no water streaming - just underwater process )



can anyone tell where should i correct the test environment to get unchipped edges or reduce chipping sizes ?


thanks

Oded Samuel.

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[warrenb]

Check the run-out on your spindle. If the bit is not running concentric this will happen. Is it possible you can do a finish pass?

[Jordan Kube]

What exactly are you trying to make? You will almost always want a "continuous surface" tool if you want smooth surfaces with glass. That looks like something you might use for granite. Glass really needs to be babied. Those flutes are creating micro-impacts on the glass and chipping it. Glass can almost always be cast easier than machined. I guess that leads me back to the first question. Are you trying to make glass shapes or precision glass shapes?