Posted by Dick L on October 13, 2012 at 07:22:37 from (50.51.177.174):
In Reply to: Re: Enlarging holes posted by Fullmer on October 11, 2012 at 06:10:24:
We do those hole sizes in those thicknesses in my mold building shop installing the guide pins and bushings. We use a mill. Before the CNC just used a standard Bridgeport mill. Most of the time drilling thru two or three thick plates at the same time. We drill the hole as large as we can or needed and then use a boring head and boring bare to suit the need. We also have to cut pockets for cavity inserts that need to go thru thick plates using the boring head.
All mill work below on the plates. My mills are my right hands when it comes to cutting large holes.
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