Re: [CAD_CAM_EDM_DRO] more on broken taps

Marcus,

Once I broke one when I didn't use the quill feed to control peck depth.
These really aren't drills, like the half-round drills you see in tool
catalogs, they look pretty much like a flat bottom single lip cutter
with a real short flute length.

BTW, once at a previous job in a sheetmetal shop, a custom square die
for the Amada punch came in without the indexing pin in the side.
Job needed to be run, no time to return for rework. I was asked to drill
it, knowing if I messed up we'd have to eat it.
Hand ground a carbide spade drill, setup the die, and peck drilled
through the side with about .002 pecks using the CNC. Don't know what
the rockwell was on those dies, but files would not cut them. Best part
was when the 3/16 drill left a press-fit hole for a dowel pin.
Here's a great example of the labor (and arm) saving benefits of CNC!

Jon