MOS Slit Cutting Test-2 Japanese
Tokoku
10/10/2006 Updated

Past Test (Japanese), 6/2004

------------------------------
Test Objective
------------------------------
Omata-san's suggestion :
>>>1. Cutting speed improvement with laser cutter.
   2. New high power laser cutter.
   3. Using EDM.
   4. Photochemical etching.
(This report is about 1.)

---------------------------------
Test procedure 
---------------------------------

>>>( 1 ) Find best parameters.
   ( 2 ) Make many slits with different widths at different position.
   ( 3 ) Measure the slit widths with microscope and
         determine relation between inputs versus outputs of the laser.
   ( 4 ) Cooling test with CIAO test dewar if anodized mask will be used.
   ( 5 ) Cooling test in MOIRCS with stars and pinhole-mask
         if anodized mask will be used. 

   ( - ) Ask for Yutani-san for cutting anodized material with laser.
         ( Exhaust instrument might be different. )

------------------------------
Tests & Results
------------------------------
Result
5: Perfect cut ( cutoffs drop off )
4: Acceptably cut ( cutoffs drop off by giving a gentle nudge )
3: Almost cut ( there are some cutoffs left )  
2: Occasionally cut ( hard to drop cutoffs off )
1: Almost never cut

w/MOIRCS frame, 1-time cutting for each slit     ... Test w/FOCAS frame





Aluminum Type
Current
Frequency
Marking Speed
Cutting
Feed Rate
Result
Comment



Hard-temper
(alloy-1100/1145)
( t=0.003mm )
16 A
1 kHz
1 mm/s
10 mm/m
1
success=0/5


18 A
2-3
success=0/5


19 A
2-3
Current Method


20 A
2-3
success=0/5


21 A
3-4
success=0/5


22 A
3-4
success=0/5


23 A
3-4
success=0/5


24 A
3-4
success=0/5


25 A
3
success=0/5


26 A
2-3
success=0/5


27 A
2
success=0/5



19 A
1 kHz
1 mm/s
6 mm/m
3-4
success=0/5



22 A
1 kHz
1 mm/s
5 mm/m
3-5
success=2/5


5 mm/m
3-5
success=3/5


6 mm/m
3-5
success=3/5, 15 min for 5 slits


7 mm/m
3-5
success=1/5


3 mm/s
6 mm/m
4-5
success=3/5


5 mm/s
3-4
success=0/6


10 mm/s
4-5
success=3/6


20 mm/s
4-5
success=2/6


40 mm/s
4-5
success=2/6


100 mm/s
4-5
success=3/6


10 kHz
1 mm/s
6 mm/m
1
success=0/5


40 kHz
1
success=0/5




24 A
1 kHz
1 mm/s
6 mm/m
4-5
success=1/5, but others are very easy to be dropped


8 mm/s
3-5
success=0/5


Black anodized
( t=0.003mm )
19 A
1 kHz
1 mm/s
5 mm/m
4
FLAMINGOS's mask


22 A
5 mm/m
4
success=1/5


24 A
5 mm/m
5
success=5/5 !!


7 mm/m
5
success=5/5 !!


10 mm/m
4
success=3/5


26 A
10 mm/m
2-3
success=0/4


Black painted
on usual mask
(alloy-1100/1145)
( t=0.003mm )
*
22 A
1 kHz
1 mm/s
6 mm/m
3-4
Black magic marker
success=1/5


Black coated
(alloy-1100/temp-O)
( t=0.002mm )
19 A
1 kHz
1 mm/s
5 mm/m
4
success=1/5


10 mm/m
4
success=3/5


22 A
5 mm/m

success=5/5


10 mm/m
5
success=5/5 !!
4/8 outer slit cannot be cut





* Black coated = Coating for absorption of light by MacMaster.

Anodized mask (top, back)
 

Black coated mask (top, back)
 


------------------------------
Update memo
------------------------------
10/10/2006
  I tried to cut "black coated aluminum (t=0.002")" to make sure if the problem
  is reflection of laser beam (power loss).

10/6/2006
  I could completely cut the black anodized mask for 1-time cutting(24A, feed=5-7mm/m).

10/5/2006
  I cut a whole mask as the same science mask with best-cut settings(22A, feed=6mm/m).
  There seems to be many dull slits at outside of a mask.
  The same can be said always for other settings.

10/4/2006
  I moved a left-lower hardstop for the laser and adjusted its position.
  Now both FOCAS's and MOIRCS's frames can be fit snugly.

10/3/2006
  Somehow the laser work bench alignment is wrong.
  MOIRCS's cutting frame cannot fit the bench now.
  At the moment, I test parameters with FOCAS's frame.