Mirror Grinding F6

But this record-shattering international growth came to a grinding halt in 2018 when Kentucky distillers became pawns in a much higher stakes game: Trade wars… In 2018, the United States imposed tariffs on steel and aluminum. In response, the EU and Mexico slapped 25% tariffs on American whiskey, which predominantly affects Kentucky Bourbon.

A To make a telescope mirror from a flat disk (of glass), the flat surface has to be changed to a spherical / parabolic surface, because a flat surface can only reflect light in the same opposing angle as it comes to the surface, but for a enlarged view to be seen, the light has to come to a small focal point, at our eye or camera lens, therefore the surface is changed by …

METAL MIRRORS — Mirrors were used by the ancient Egyptians as early as c.2900BC. These were made of polished bronze shaped into flat round discs—in representation of the sun-god Re—with handles of wood, metal or ivory. Likewise, in China, an unearthed cast bronze mirror has been dated as early as 2000BCE. By the time of Seneca the younger ...

Table 2. Documented scratches in mirror clear aperture. Location (Core #) Length (mm) Width (mm) Comment B1 50 0.1 From grinding F6 7 0.1 Bubble dressing Table 3 . Partial list of bubbles in mirror clear aperture. Location Size(mm) Area(mm2) Location Size(mm) Area(mm2) A1 3.5 9.616 C5 2.5 4.906 A1 2 3.140 C6 2 3.140 A2 4 12.560

The first phase of rough grinding my 8.5 inch Pyrex disc into a telescope mirror. Including beveling the edges, measuring sagita (central depth), and grindin...

That would make a 150 mm F8, or a 200 mm F6 mirror. First phase : rough grinding (or hogging out) In this stage of grinding we want to dig out the flat glass blank, in other words, create a saggita. Saggita is a section of a sphere, its radius of curvature (ROC) is TWICE as long as the focal length of the mirror.

Metal bonded diamond grinding wheels are very important for precision grinding operations of hard and brittle materials especially like ceramics or cemented carbides. But the trueing and dressing problem has affected its wide use. In this paper, a new EDD (Electrical discharge dressing) device was developed for the dressing of metal bonded diamond arc grinding …

Telescope mirror grinding machine Mirror making and optical testing … The images below show the completed grinding machine in it's new garage in October 2001. GrindingPolishingMachine – LCAO. Telescope Making. Telescope Mirror Grinding and Polishing Machine. After I had made the 41-cm telescope mirror by hand I had decided that I needed a ...

Page 1 of 3 - Mirror Grinding - Take A Class Or DIY? - posted in ATM, Optics and DIY Forum: Ive been interested in grinding/polishing my own Newt mirror for a long time but dont know how to get started. As a beginner, would you recommend attending a workshop or class or is it possible to make a good mirror using other learning resources such as books …

Mirror Maker *Club Member Mirror Size Focal Ratio Start Date Mirror Status Status Date; Andy W. 8" f/6: : Polishing: : Antoine R. 8" f/5:

[ATM] 20incher with segmented and ribbed mirror at 12Kg, Andreas Derwahl. Re: [ATM] 20incher with segmented and ribbed mirror at 12Kg, Ric Rokosz. Re: [ATM] 20incher with segmented and ribbed mirror at 12Kg, Andreas Derwahl. Re: [ATM] 20incher with segmented and ribbed mirror at 12Kg, John Sherman; Re: [ATM] 20incher with segmented and ribbed mirror at 12Kg, Mel …

8" F6 Mirror Grinding For grinding tools I have read that it is recommended to use dental plaster or pure cement as a substrate. Then tiles are attached to this substrate either by glue or to embed them directly in the plaster or cement when the cast is made. Other tools used for hogging out also can be a metal ring or pipe flange.

Could anybody recommend a book on mirror grinding and figuring that is easy to buy in the UK and easy to follow. I'm after a default recommended text just like Making Every Photon Count is the recommended text for AP. ... you should do a nice 12" f6.

I'm talking multiple primaries, not folded scopes. I KNOW that mirror focal lengths must be matched, and there are BIG collimation headaches, and that mirrors off axis have coma probs (Long focal length may not be so bad), but I can get 4 or 5 finished 6" mirrors for less than a 12" mirror grinding kit.

While I was in the construction process of the Mirror-O-Matic I had ordered a 10" an 8" plate glass kit. Here is the 10" ready for fine grinding. The only part I could not find locally was the toggle pad used in the overarm assembly. This part I ordered from Reid Tool Supply Company. The 8" came at a later time then the 10".

SVBONY 1.25 inches 90 Degree Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes Astronomical Telescope. 4.3 out of 5 stars. 189. $18.99. $18. . 99. Get it as soon as Thu, Nov 4. FREE Shipping on orders over $25 shipped by Amazon.

Grinding time per mirror was 5 hrs of 500 grit, 5 hrs of 220 grit and 4 hours of 60-90 grit; grinding times for the tool are double the individual mirror numbers. Step #10: cast a new tiled tool to finish grinding. Goal: make a replacement tool …

Click for price. Sometimes the reason that you are looking for a mirror alternative will be due to a lack of space. If you don't have the room to hang a mirror in your bathroom or your bedroom, then maybe you should think about purchasing a door mirror. A door mirror will be able to provide you with the mirror that you need, while not getting in your way.

The first design was a 150 mm F4 Newtonian (diameter of the main mirror 150 mm with the F-ratio 4). However, I was told that a F4 mirror is not very easy to make especially if you are grinding your first one. Therefore I decided to make a F6 mirror instead of F4.

A few years ago, I was thinking about hand grinding a mirror. I watched a YouTube video of John Dobson hand grinding a mirror. I don't really remember how big it was, but it was big. Maybe 14". Maybe larger. John was no youngster in this video and even though he is a master, he sure put a hellova lot of labor into that mirror.

Meade Series 5000 2in Enhanced Diagonal Mirror With Adapter. 5 out of 5 stars. (8) Total Ratings 8, $202.39 New. Celestron Dielectric Star Diagonal 1.25in w/ Twist-Lock Black/Orange 93571. $129.95 New. Dust Caps for 1.25" Telescope Eyepieces Barlow Lens or. 5 out of 5 stars.

8" F6 Project. CONSTRUCTION DETAILS: Mirror Coating. The Tube. Spider Assembly. Rocker Box. Tube Rings. Mirror Cell. Finishing Touches. Throughout this site click on any image for a larger picture. The entire project of building the mirror-o-matic, grinding and polishing the mirror, an building the telescope took a little over a year to ...

Mirror makers turn to sub-diameter laps for larger faster mirrors. Deep parabolas can be carved out and zonal irregularities attacked. However, surface smoothness is an issue. A smooth mirror surface along with deep parabolas can be achieved with full-sized or over-sized pitch laps by varying the pitch lap's area of contact.

For six inch mirrors the radius of curvature could be 90 inches (F7.5). For a 12 inch mirror this distance could be 150 inches (F6.25). Since the rest of the telescope will be built later these numbers for mirror radius need not be exact. Materials Mirror grinding kits are available from various sources.

The 1.3m telescope mirror blank has been completed by Peter Wangsness and is now … 1.3m mirror blank – yard stick comparison . 1.3-m Mirror Grinding Machine – Photo: Mike … Mirror-o-Matic mirror making machine – ATM pages of Berthold …

• Grinding ±0.008mm • Lapping ±0.005mm Surface finish, roughness Casting • Die Casting Good 1-2µm • Investment Good 1.5-3 • Sand Casting Poor 12-25 Metal forming • Cold rolling Good 1-3 • Hot rolling Poor 12-25 Machining • Boring Good 0.5-6 • Drilling Medium 1.5-6 • Milling Good 1-6 • Turning Good 0.5-6

12.5" Plate glass mirror rough ground too deep - posted in ATM, Optics and DIY Forum: Hi, Just looking for a little advise. I have been rough grinding a 12.5 x 1.5 thick plate glass mirror. I was originally aiming for F6 because this is only the second mirror I have ever attempted and I didnt want to figure anything too fast. Unfortunately, I ground it too deep and it …

Rough Grinding. The disk of ceramic, Pyrex or glass porthole which is to be the mirror is ground across the edge of the tool glass with 60 mesh carborundum grit and water between. The mirror disk is rotated every few strokes to form a surface of revolution. A depression is ground in the center of the mirror and the edge of the tool glass is worn away.

Finally got to the fine grinding stage for my 8" F6 telescope mirror! by [deleted] in telescopes. Natoface 1 point 2 points 3 points 2 years ago . awesome, have you made telescopes before? I've wanted to make one but it looks like a massive effort and I wouldnt know where to alluminise maybe spelling the reflector. permalink ...

8inch f6 mirror issues - posted in ATM, Optics and DIY Forum: Hi Experts I am working on 8 f6 mirror which is 16mm in thickness. I am into polishing and facing serious center, zone and edge issues. Please refer to the images attached. I am using 1/3 COC narrow W stroke alternating mirror and tool on top. But the central hole is not budging.