G83 won't rapid to the bottom of hole?

[FASTSemi]

Hello all,
I'm new here and to machining, but have been CAD/CAMing in solidworks/camworks for a few months and have some ?s.

I'd like to drill a 2mm hole through 0.75" quartz on my HAAS VM2, and man, using G83 is likely to take upwards of a week with the required feeds at F0.06 IPM (10,000RPM).

The lengthy time comes from the fact that after the rapid retract, my machine feeds back to the hole bottom at the stated feed rate. Is there a way to RAPID back to the bottom of the hole, say 0.020" above the floor? That would cut time down by 95%.

Thanks
Damon

[Donkey Hotey]

What value do you have in setting 22?

[Caue]

Please subscribe us with the values set on settings 22 and 52 and the part program and so we can help you.

Cheers!

[+/-?]

g73 (high speed peck drill??)

[FASTSemi]

I found out what was wrong, at least i think so. G83 worked like it was supposed to, but Setting 22 was set too high (0.050in). With a feed rate of 0.06 in/min, and a a depth of 0.8, it was set to take weeks (almost literally) to do. I changed the setting to 0.005 and the task took a more reasonable time.

Here's the code that i've got:

%
O0001
N1 G00 G90 G20
N2 T07 M06 (2.0MM Diamond DRILL)
N3 S10000 M03
N4 G00 G54 X0 Y0 S10000 M03
N5 G43 H07 Z.02 M08
N6 G83 R.02 Z-.8 Q.001 F.06
N7 G80 Z.03 M09
N8 G91 G28 Z0
N9 G28 X0 Y0
N10 M30
%
(this is all kicked out from Camworks- HAAS Post)

All it is is pecking down to 0.8" deep. It's a small drill in a very hard material, but i don't have access to center-cooling bits. so, i'm relying on a retract to flush out debris and insert coolant on each plunge.

Anyone have any ideas on how to speed this up a bit?
Thanks
Damon

[HuFlungDung]

Sounds a little like drilling glass, so maybe a soft core drill technique would work: obtain some steel tubing (like a hypodermic needle) and diamond paste, and core drill the hole. Now a machining center is maybe not the right machine for the job, a simple drill press with a weight hanging on the lever, while the thing runs merrily away, eroding its way in.

[+/-?]

we use to interpolate small holes -.75 and deeper with core drills and thru spindle coolant on our quartz .........worked great. with out t.s.c. your pretty limited.

[FASTSemi]

Originally Posted by +/-? we use to interpolate small holes -.75 and deeper with core drills and thru spindle coolant on our quartz .........worked great. with out t.s.c. your pretty limited.

you are 100% right! TSC is about 5 times faster, but we only need to do this a few times. So the cost isn't justified.