Frankq_it

[Frankq_it]

Hi everyone
I watched two movies of Gordon Waitie (Hogging the Curve on a 20_ Quartz Telescope Mirror (480p_30fps_H264-128kbit_AAC) e (Rough Grinding a 20_ Quartz Telescope Mirror on the Fixed-Post Machine (480p_30fps_H264-128kbit_AAC) and I think I can build myself a rotating table for my mirror from 300 mm
I recovered a three-phase gearmotor in the garage 1/60 and a reducer 1/14 which gives me a speed of 16 g / min.
I don't have a thrust bearing for the rotary table and they cost a lot of money. In the photos they used spheres, however, in the posts we talk about wheels! What is the right version?
Moreover, the speech that if the tool(or the mirror) works at the outer limit, the center of gravity can fall outside the wheels / balls triangle with consequent overturning, I don't have enough experience to evaluate how big the rotary table should be.
Franco

Franco

[Frankq_it]

Ciao, I found 3 companies that cut me the blank.
1) the glass is Lospessore 19 mm.
2) The glass color is greenish or clear. Given that goes aluminized think it should be well greenish. I'm wrong?

Franco

[Frankq_it]

ciao,
60 hour, 1 Now in the morning and in the evening they do a month + 15 days for measures, prove, mistakes. 2 months to alluminare, 1 week to build the structure. In the spring I have the new telescope
Go!

Franco

[Frankq_it]

Ciao,
if to pave the edge I need to use abrasives, then it's not worth the effort. We abandon the idea of ​​China and back to 300 / f5
Thanks for the attention

Franco

[Frankq_it]

Ciao,
I use hydrogen peroxide and hydrochloric acid to etch the copper, fast and disposing well.
Having a 200 / f4 to bring it to a f5 or f6 action should be taken on the medium / mirror outer crown.
It manages to do this with ceria?
You used chalk by dentists to build the tool! What's special about this chalk?
Muccioli in his videos he used a tile in gress, it is regrettable?

Franco

[Frankq_it]

Hi Massimo
it was just to chat, I sleep little and do not watch television.
I decided to make the telescope, I left for a 250 / f6, but then it is considering that more than one I can not help, I decided for a 300 / f5.
I already have experience; more than 40 years ago a friend got me the grinding of a 200mm.
We went to take blanks from the parts of Fiesole, where the workers of Galileo had a small workshop. Blanks and abrasive. During roughing my friend gave forfeit, I went on but after a while my girlfriend asked me very seriously if it meant passre time to turn around the table. I gave blanks and abrasive to a boy who can not remember Pistoia.

Franco

[Frankq_it]

Very true, but it will start to come away from the outside because I started parabolizzazione.
Eventually I hypothesize, and I ask you to confirm, which will take the form of a parable; it is possible that the center of the mirror hang in the aluminizing, and in this case I wonder;
will bother to various tests?
Inpedirà redo the light?

Franco

[Frankq_it]

Ciao,
you just saying, but whether that happens to the Chinese spherical mirror there I build his tool pitch and began to polish it with cerium oxide?

Franco

[Frankq_it]

Indeed there wrote, spherical mirror
Well, in September we try to call
Thanks for the link focuser, I just look at them for a moment

Franco

[Frankq_it]

Hi everyone
Giulio, last night I was undercooked and I took whistles for flasks
On Aliexpress I found this mirror; 200mm F4 with 150 € and 3 I should have months: so I would have time to build Dobson. Then if we go to a potreemmo pesnsare 300 crumbs from me
http://www.aliexpress.com/item/Newtonian-reflecting-telescope-D203-F800-D203F800-203800-reflection-Objective-lens-Secondary-mirror/32651882904.html?spm

Interesting what you tell me of the focuser; I could have access to a lathe.
Have links?

Franco

[Frankq_it]

Thanks for the info
Buy already built takes away the pleasure of doing; I consider that being Class 46 it's not that I remain a long time before.
But, with all my equipment, the construction of the telescope should be sent. Therefore I must evaluate the purchase of a kit mirrors.
For example, this kit; if it looks good I could buy it right away
http://www.nadir-astronomia.it/shop/autocostruzione/1188-kit-specchio-primario-e-secondario-geoptik.html

Franco

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