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Dangle_kt
18-01-2017, 03:19 PM
Well I can't measure run out on the actual end mill, so I am using various parts of the toolholder/spindle housing as proxies....

Is this normal? Or does the tool holder need slinging

https://www.youtube.com/watch?v=g0JeX-duL9A

komatias
18-01-2017, 03:36 PM
Well I can't measure run out on the actual end mill, so I am using various parts of the toolholder/spindle housing as proxies....

Is this normal? Or does the tool holder need slinging

https://www.youtube.com/watch?v=g0JeX-duL9A


I see you are measuring the nut. The nut will always be bad. Youtube is having a bad day here so cant watch all.

Measure the runout of the taper in the spindle to establish if it is running true. You should have a total movement of less than 0.01mm (according to my old books)

Then install a tool holder and measure the TAPER of the collet . NOT the thread or the locking nut.

Then install a ER collet with a reference bar. A ground piece of metal like a edgefinder is fine and measure that.

With good stuff you should not have a cumulative runout of more than 0.05mm

Dangle_kt
18-01-2017, 03:44 PM
Thanks - that is really helpful