--- In
Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@...> wrote:
>
>
> I just finished up my CNC quill drive conversion my Bridgeport and would
> like to use it to drill boards. I have not found a reference to what
> speeds and feeds to use for drilling.
>
> I am looking for the surface feet per minute and feed per turn numbers
> for small carbide drills in FR-4. My 5400 RPM maximum going to be
> well below the 30,000 to 60,000 RPM used by a real PCB drilling spindle
> but it should still work fine if I use the correct feed rate.
>
> Anyone got a reference for these parameters.
>
>
>
> BP Quill Drive
> <http://picasaweb.google.com/lh/photo/B-uAtxYUicys82cFdd5HYg?feat=direct\
> link>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
I uploaded two pdf files that have the information needed to calculate feeds and speeds. These files are scans of a slide rule drilling calculator that Excellon provided to their customers. Back in those days I was running three Excellon machines, two driller/routers and one drilling machine. Using those formulas, each machine was averaging a million holes per week with very few broken drills. The bits wore out before breaking so I would say those formulas worked pretty good! There is some good information on router feeds and speeds as well.