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When it starts to be a little drier whistles makes them when I rotate the mirror on itself, when I make back and forth no. For the rest we. well rounded I keep my tool edges, a job 40 minutes and then at for 10 minutes, when microfaccettature begin to close and reopen the channels take the opportunity to also trim.
When the lines are perfectly straight at each focal length pass to parabolizzazione. But the figure of reference, taken by the Ronchi test software, It can be taken to any real focal distance? Then in reality you have to go try to get the same image moving at the right distance… Then once I obtained the correct image would move on to refine it in favor of abandoning the Ronchi Foucault, is the right way?Stop! Maybe I see the light at the end of the tunnel… I have reversed a half-hour games, Tool required above and below the mirror and it would seem to go your way. Alternerò Mot and Tot for a while and see how it goes.
Here I begin to fear… I think it goes worse. Yet new tool, pressing 2 hours and then 25kg of ripressatura 10 minutes each 45 minutes of work. No pressure. Spend 1 / slightly abundant 3D (1 or 2 cm) An hour and a half of work, and I find myself so.
I do not know how to get on.No Massimo, to be honest the pictures I made with 125 lpi then around the 5 lines / mm because with the 200lpi not see well the separation between the lines. But tonight I finish to open new channels tool, then hot pressing, cold ripressatura after a while and again. Fingers crossed!
P.S. The other day they gave me an unused and dusty Skywatcher 150/1200 mounted on a non-motorized EQ3, I disassembled the mirrors were covered with a thick layer of dust, I put them in a container with distilled water, neutral detergent and floating cotton to graze the surface and came perfect! reassembled and collimated last night I managed to see Andromeda (Well, to see a whitish halo with a brighter core), the Pleiades and the moon. Be a 150 so poor with only one eyepiece (10mm) still he managed to give some small satisfaction, with 300mm and ocular park worthy I think that we'll spend the hours!
I had seen that video Giulio, according to me, however, it becomes difficult to uniformly heat the corona. My little experience does not allow me to say too much though, so feeling, watching some mega visible defects in Ronchi Test of other scratchers that are still accommodated in the polishing stage, I would hope that the deviation in my case is as recoverable. I'll have a clearer picture of the situation with the new tool, putting into practice all received advice and experience made so far. If even then the direction will not change, then I will assess, after moments of despair, other roads
Well, so I will proceed. The pressure, if present, It must be exercised with the thumbs in the right central area? Using palms and fingers to just go and come Mirror. It may have been a contributing cause excessive pressure on the edges?
Cabbage, then what I need might be more long runs or TOT. What I do not understand is that they should do the normal 1 / 3D, but in my case not seem to work for outside, sign as you say maladaptive. The reality is that I have no idea how to better adapt the tool as well as stand on it with 80kg for half an hour despite the pressing both hot and not cold! Bah, if in doubt redo the tool
Re-reading your response Massimo think I misunderstood. I understand that it is the opposite of what I just drew! Namely, that the center follows a spherical trend but towards the edges of the walls tend to rise in fact shortening the ROC! I thought I was the opposite as in the previous post we talked Ellipse:
ok, I thought that the names of the images were reversed, but if the first image is actually extra time you're away from the parable, you are currently in a conical tending ellipse with K ( conic constant ) positive, while you have to reach the value of K = -1 parabolic, and we must inevitably come back to the ball ( K=0 ) and then distort it to the parable
The feeling that you had to be on the road in the parable, It would be correct if the images had been "on the contrary", and that the image had been extras in the intra and vice versa
However, this does not take away the good work you're doing, these aspects are "fixed stages" in the career of a grattavetro
So I thought outside the ROC was longer.
What a mess! You'd better make breakfast
Ok, Here I have to understand where the problem lies. It could be a tool with pitch too thin layer which thus better promotes the adaptation at the center? I just 3mm thick now. When in doubt agree that a new remake.
Based on what you suggest I have a bowl shape, then, looking at the cutting mirror, the edge turns out to be flatter than at the center. I wonder, if allungassi races, not further appiattirei edge up in extreme cases to make countered? I almost thought I was in this situation:
Edit:
Where the dotted line is the figure that I should have and the black figure where I am. They are in this situation?guys, I went back to work after a wait Forced from having dropped the stock of cerium into the bucket of water
I'm back now operational and I worked about an hour, solution of water and cerium much denser, hot pressing going on with all my weight for half an hour, past 1 / 3D center to center. No way, I can not see improvements. I am posting only the intrafocale much is already Explanatory… I just do not understand, I'm sure the contact is perfect, cerium oxide makes a nice noise, The froth is generated along the canals and everything seems to be okay. I tried with more pressure at the center, without pressure, nothing:cry:
Cabbage but at least change for the better or the worse should see them no?
Here, on this thing dilution I had my doubts… It is a report I read in different reports but which I think makes little and nothing. Perhaps it can be good value for work up during parabolizzazione, but the search for the ball something more consistent and effective I think is more appropriate. I will try to also reduce the ratio, thanks for the advice guys!
Cabbage… Yet I was almost sure it was in good contact. By interposing the film contact occurs in all the squares, usually it starts in the center and as they pass the minutes of evens pressure.
Tomorrow I will try to let more time the tool in hot water and to increase weights and pressure times. The thing that leaves me a little doubtful is that the test with the laser to assess the degree of lucidity seems not to bring differences between center and edge. The imprint, although weak, It is still visible with the same intensity on all the face while if I worked with a bad contact should show variable with the move along diameter. Oh well, I am already happy not to have (it seems to me) coarse machining errors, You will find the right compromise and work hard a few more hours. not defeated!
The ambient temperature is around 23 ° C and then at an ideal temperature for this pitch (Stathis has shown me the optimal range by 18 am 26 ° C).
Before working at about rinfrescasse 28/29 degrees but it was a suffering, channels that closed faceting and micro reset in a few minutes.
Now my modus operandi is:
I open good channels of the tool and do a faceting micro grid with the cutter blade.
Fill a container with hot tap water.
I put inside the tool for two or three minutes or until the pitch begins to soften.
Shooting off the tool and put it on the floor.
I put a bit of cerium oxide, previously diluted in water (1/8) with two drops of dish soap, on the tool surface.
They position it properly centering it over the mirror.
Add approximately 10kg in weight and let stand for a few minutes, around a little mirror and get back weights. Await that pitch and mirror to equilibrate thermally and that the pitch is returned to the working temperature.
I assure you that the whole face is in contact, put a mixture and sprayed with childbirth center movements of the center 1 / 3D taking as a reference a circumference made in marker on the back of the mirror.
I perform 8 past the mirror then it rotates counterclockwise by about 30 ° while I move in the direction of a step time.
I reworked an hour and a half from the previous post:
The thing that is known that the microfaccettatura tends to disappear first on the outer part of the tool, sign that either the party to work more.
One can see in this photo of the tool after a couple of hours of work, the channels slowly closed and the micro-faceted architecture tends to weaken the outside.
