A feed rate of 29 in./min. equates to drilling through a PCB in a little over 1/10 of a second. Are you really drilling through them this quickly?
Craig
---In Homebrew_PCBs@yahoogroups.com, <mikewhy@...> wrote :
Craig
---In Homebrew_PCBs@yahoogroups.com, <mikewhy@...> wrote :
Aside from runout, feeds and speeds can be the culprit. FSWizard Pro
gives the following for a 0.03" 2-flute, uncoated carbide drill in
FR4.
RPM 20k
SFM 150 ft/min
Feed rate: 29 in/min
........
RPM 20k
SFM 150 ft/min
Feed rate: 29 in/min
........