Ronchigram | Plot matched to best conic fit | Plot matched to target | Comment and polishing remarks |
30min. 4" TOT center stroke 20% offset full length. 50% point pressure. | |||
30min. 10" MOT parabolizing W-stroke. | |||
30min. 10" MOT parabolizing W-stroke. | |||
20min. 4" TOT center stroke 10% offset full length. 80% point pressure. | |||
20min. 4" TOT center stroke 10% offset full length. 80% point pressure. | |||
30min. 10" MOT parabolizing W-stroke. | |||
30min. 10" MOT parabolizing W-stroke. | |||
20min. 4" TOT center stroke 10-20% offset full length. | |||
20min. 10" MOT parabolizing W-stroke | |||
20min. 4" TOT center stroke full length. | |||
30min. 4" TOT center stroke full length. | |||
20min. 4" TOT center stroke full length. 50% point pressure. | |||
20min. 4" TOT starlap center stroke full length. | |||
20min. 4" TOT starlap center stroke full length. | |||
30min. 4" TOT starlap center stroke full length | |||
30min. 4" TOT starlap center stroke 33% full length 33% 2/3 length, 33% 1/3 length. | |||
30min. 4" TOT starlap center stroke 33% full length 33% 2/3 length, 33% 1/3 length. | |||
30min. 4" TOT starlap center stroke 33% full length 33% 2/3 length, 33% 1/3 length. | |||
40min. 4" TOT starlap center stroke 60% full length 40% 1/2 length. | |||
20min. 4" TOT starlap center stroke 60% full length 40% 1/2 length. | |||
5min. 4" TOT starlap circles on edge. | |||
10min. 4" TOT starlap circles on edge. | |||
20min. 4" TOT starlap center stroke 60% full length 40% 1/2 length. | |||
10min. 4" TOT starlap circles with point pressure on edge. | |||
10min. 4" TOT starlap circles with point pressure on edge. | |||
30min. 4" TOT starlap long central stroke 40% point pressure. | |||
3min. 4" TOT starlap circles R=60mm | |||
6min. 4" TOT starlap circles R=70mm.
4min. point pressure circles on edge. |
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10min. 4" TOT long strokes 20mm offset from center. 50% point pressure.
5min. circles on outer zone. |
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10min. 4" TOT long strokes 20mm offset from center. 50% point pressure |
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20min. 4" TOT starlap circles on outer zone. | |||
5min. 2" TOT circles on R=50mm. | |||
10min 2" TOT circles on R=40-70mm. | |||
12min. 2" TOT circles on R=50-70mm. | |||
30min. 2" TOT on turn table. Close to edge. Repress lap. | |||
30min. 2" TOT on turn table. Close to edge. Bad last measurement data point. | |||
10min. 4" TOT starlap. Long center strokes 50% normal, 50% point pressure. Too much. | |||
45min. 2" TOT turntable edge on edge +-5mm. Point pressure. Groove 5mm from edge. | |||
15min. 2" TOT turntable center on edge. No pressure. Groove softer. Needs more. | |||
20min. 2" TOT turntable center on edge. No pressure. Groove softer. Needs more. | |||
30min. 2" TOT turntable center on center. No pressure. Needs 4" to soften. | |||
20min. 4" TOT starlap turntable center on edge. No pressure. Outer zone softer. Center on edge is best. More! | |||
40min. 4" TOT starlap turntable center on edge. No pressure. Edge better. | |||
30min. 4" TOT starlap turntable center on edge. Edge down? Bad measurement. | |||
10min. 4" TOT starlap circles R=80mm. | |||
5min, 4" TOT starlap circles R=50-80mm. | |||
20min. 2" TOT turntable. Center on edge. | |||
20min. 2" TOT turntable. Center on edge. | |||
20min. 4" TOT starlap turntable. Center on edge. | |||
20min. 2" TOT turntable. Center on edge
+ 6min. R=40-60mm |
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10min. 1" TOT turntable R=115mm
+ 6min. 2" TOT R=40-90mm. |
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20min. 2" TOT turntable . Center on edge. | |||
5min. 2" TOT turntable R=70mm.
+ 5min. center on edge. |
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5min. 2" TOT turntable R=40-70mm.
+ 5min. center on edge. |
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5min. 1" TOT turntable R=60-80mm. + 5min. R=110-120mm. | |||
8min. 2" TOT turntable R=50-90mm. |
Repeat measurement 2003/12/24b. | |||
5min. 2" TOT turntable R=60-110mm. | |||
3min. 2" TOT turntable R=70mm.
Try 1" TOT on 2 zones. 2min each. |
Only a very few scratches showed up around the hole. But that area is covered by the secondary anyway!
From now on testing could not be performed with the reference pont in
the center of the mirror. An averaging technique was used to find a virtual
center mark. Again 100mm obstruction is assumed.
The hump at R=75mm has gotten a bit higher. But that can be a measurement artifact. I'll go 3min 2" TOT at R=75mm | |||
4min.2" TOT turntable. Zone at R=75mm better. Probably measurement artefact at R=120mm? Remeasure! | |||
No polishing! Remaesured. Try 3min. 1" TOT R=100mm. | |||
4min. 2" TOT turntable. R=70-110mm.
Too much! |
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2min. 1" R=105-120mm + 2min. 1" R=65-85mm.
Very close! |
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1min. 1" R=75mm.
1min. 1" R=105mm. Measurements at 0deg and 240deg agree. 120deg seems to have a problem. 110mm zone still visible. One last try.
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After re-measuring the ruler used in the wire test the tick marks on
the ruler were made more accurate. Some were off by perhaps 0.3mm. With
the updated ruler the measurements were repeated and it seems that the
shape of the mirror has been slightly misjudged. From now on all measurements
are with the updated ruler and 80mm obstruction to give a better overview
of the mirror over a larger area.
Remeasurement shows high zone at R=55-85mm and low zone at R=85-100mm.
Try 3min. 1" TOT on R=55-85mm. |
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1" 3min. TOT R=55-85mm. | |||
2" 3min. TOT R=75mm. | |||
1" 5min. TOT R=50-80mm | |||
1" 6min. TOT R=72mm | |||
1" 6min. TOT R=67mm.
1min. Edge zone. |
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1" 5min. TOT R=72mm.
2min. R=115mm |
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1" 6min. TOT R=55-75mm.
3min. R=115mm. |
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1" 5min. TOT r=105-110mm. | |||
1" 10min. TOT R=100-125mm. | |||
1" 5min. TOT R=95-120
+ 5min. R=65-90mm. |
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1" 5min. TOT R=110mm
+ 8min. R=70-90mm |
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1" 12min. TOT R=80mm. | |||
New shaving and pressing of 1" lap.
1" TOT 6min. R=80mm. |
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1" TOT 15min. R=75-80mm.. | |||
2" TOT 6min. R=75=80mm. | |||
2" TOT 12min. R=75-80mm. | |||
2" TOT 8min. R=85mm
+ 4min. R=105mm. |
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2" TOT 8min. R=65-82mm
+ 4min. R=105mm. |
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2" TOT 10min. R=65-90mm. | |||
2" TOT 6min. R=55-80mm. | |||
2" TOT
3min. R=55mm, 3min. R=85mm, 3min. R=55-85mm. |
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2" TOT
5min. R=65mm, 3min. R=65-85mm. |
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2" TOT
4min. R=65mm. |
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Replot with 100mm diam obstruction + only 9zones.
96%Strehl. DONE! |
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Email : drgert1@yahoo.com
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