Hi everyone!
Look at the attached figure. After 17 figuring steps I have 1/7.16 lambda error at zone 4 and slightly raised center. I don't really see it during qualitative test, but numbers don't lie.
I have learned a lot, tried many tricks and finally ended up switching c-o-c 1/3 overhang stroke with parabolization with pressure on edges. I REALLY tried to turn the edge down but my pitch lap is apparently too hard and the edge always stayed up.
The numbers looks kinda nice everywhere except zone 4. I was thinking I could use TOT and use only tool's center to press and do the small zig-zag only on zone 4 blending it with zone 3. Do you have an experience with this kind of strategy of correcting the edge?
Or... should I just forget about further corrections and take the mirror for aluminization? I am really tired and starting to loose my enthusiasm.
Here are the numbers from 3 readings:
Z1: 0.08 0.02 0.12
Z2: 0.48 0.50 0.51
Z3: 1.12 1.10 1.13
Z4: 1.58 1.57 1.55
Mirror dia: 203 mm
ROC: 2390.8
MOVING KE
Mask Radius: inner / outer (effective):
Z1: 18.75 / 37.5 (28.886)
Z2: 51.75 / 65 (58.562)
Z3: 75.25 / 84.5 (79.942)
Z4: 93.5 / 101.5 (97.541)
Look at the attached figure. After 17 figuring steps I have 1/7.16 lambda error at zone 4 and slightly raised center. I don't really see it during qualitative test, but numbers don't lie.
I have learned a lot, tried many tricks and finally ended up switching c-o-c 1/3 overhang stroke with parabolization with pressure on edges. I REALLY tried to turn the edge down but my pitch lap is apparently too hard and the edge always stayed up.
The numbers looks kinda nice everywhere except zone 4. I was thinking I could use TOT and use only tool's center to press and do the small zig-zag only on zone 4 blending it with zone 3. Do you have an experience with this kind of strategy of correcting the edge?
Or... should I just forget about further corrections and take the mirror for aluminization? I am really tired and starting to loose my enthusiasm.
Here are the numbers from 3 readings:
Z1: 0.08 0.02 0.12
Z2: 0.48 0.50 0.51
Z3: 1.12 1.10 1.13
Z4: 1.58 1.57 1.55
Mirror dia: 203 mm
ROC: 2390.8
MOVING KE
Mask Radius: inner / outer (effective):
Z1: 18.75 / 37.5 (28.886)
Z2: 51.75 / 65 (58.562)
Z3: 75.25 / 84.5 (79.942)
Z4: 93.5 / 101.5 (97.541)
Attached Image:
8" f/5.9 truss tube newtonian, made from scratch 8)
