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rocknice2
Mar 22, 2012, 6:16 PM
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Registered: Jul 13, 2006
Posts: 1221
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All Ice Climbers
I'm sharpening ice screws with an aggressive tooth profile. I can also convert your old style BD's to new style. Grivel, Petzl, Omega and DMM can also be sharpened to an aggressive tooth profile.
A 4-axis CNC milling machine is used and the results are fantastic. The screws come out very sharp.
Twice a year, I collect all screws by a certain date and then run them all off as a single batch run. I keep everyone's screws separate of coarse
It's too expensive to run a CNC machine for a dozen screws so this is the only way to keep costs down.
Next Batch Run: APRIL 27 2012
Check out my website for more details
https://sites.google.com/.../icescrewsharpening/
Super Stubbies too.
https://sites.google.com/...ng/home/super-stubby
I have been sharpening screws now for the public for a year now and 3 years for myself.
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rocknice2
Apr 4, 2012, 1:34 AM
Post #2 of 13
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Registered: Jul 13, 2006
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Here are some pics
 Ice Screws 10-22cm aggressive tooth
 #5 Super Stubby [aprox 6.2cm]
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rocknice2
Sep 12, 2012, 1:47 AM
Post #3 of 13
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Registered: Jul 13, 2006
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Just a reminder that there is about 30 day left before the deadline for the next batch of ice screw sharpening.
Friday October 19 2012
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majid_sabet
Oct 10, 2013, 4:42 AM
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Registered: Dec 13, 2002
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send me your G code
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rocknice2
Oct 10, 2013, 1:16 PM
Post #7 of 13
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Registered: Jul 13, 2006
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Are you telling me you can't figure it out on your own.
I'm on rev9.1 now. There was a whole bunch of fiddling with the angles and different endmills to get the desired undercuts and face angles.
But the program below will cut 4 teeth on a screw
Can you figure out how I'm holding the part. Most importantly how I'm able to clamp every screw with the teeth orientated on exactly the same A and X axis? Without spending 10 minutes to calibrate the geometry offsets for each and every screw. That's the hard part actually, not that the program was easy to polish.
Program for a 4 axis milling center. A-Axis rotates around the X-Axis
%
:1 (ICE SCREW REV1)
(A-ZERO = TIP ON CENTERLINE)
(X-ZERO = TIP OF SCREW)
(Y-ZERO = CENTER OF SCREW)
(Z-ZERO = OD OF SCREW)
(OFFSET FIXTURE X-.03" A-3.5°)
L100 (RUFF)
G0 A5.
X.125 Y0
G1 X-.275 A-15. F100.
X.125 A85. F200.
G0 X.25
M17
L200 (FINN)
G0 A90.
X.125 Y0
G1 X-.28 A-20. F500.
X.125 A0 F200.
G0 X.25
M17
M30
T1 (ENDMILL)
G17 G90 G0 X.25 Y0 A0 S1000 M3 E1
Z-.2 H1 M8
L101
G52 A90.
L101
G52 A180.
L101
G52 A270.
L101
(FINN PASS)
S2500
L201
G52 A180.
L201
G52 A90.
L201
G52 A0
L201
G52 A0 M5 M9
G53 Z0
X0 Y10. Z0 E0 H0 A0
M30
%
Good Luck
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rocknice2
Oct 1, 2014, 1:31 PM
Post #9 of 13
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Registered: Jul 13, 2006
Posts: 1221
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The next batch deadline for sharpening your ice screws is
Friday October 24 2014
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mikebarter387
Jan 15, 2015, 1:05 PM
Post #10 of 13
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Registered: Mar 21, 2007
Posts: 237
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Not sure why anybody would send their ice screws away to be sharpened. I bought one of those petzal ice screw sharpners. Takes about 2 minutes to to turn a dull BD screw into a razor sharp ice killer. I've only been sharpening my own screws for 20+ yrs before you start slagging me.
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rocknice2
Jan 15, 2015, 1:31 PM
Post #11 of 13
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Registered: Jul 13, 2006
Posts: 1221
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Because the Lim'ice doesn't produce the same angles as found on the newest screws. It can reproduce angles similar to the older style BD's. The Grivel sharpening machine doesn't sharpen to the newer angles either.
I think most will agree that the newer aggressive teeth start way better than the older shallower ones.
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