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Criterion 1-1/2" Boring Head

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Bored a hole in 1" aluminum on my supermax 9 X 42 bport clone , opened the boring head all the way open
To bore a 1. 554 hole . Don't think the mill liked that much it was kinda shaking , now the nod is off .
Vfd set to 17 hrtz , belt on fastest pulleys, guess I need a tach .
Question : do these things need to go reeealy slow ? Any hints , that was my first boring experience :confused:
Guess I need to watch utube a little more
Thanks

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