Mirror Grinding F6

How to Grind a Telescope Mirror in 10 Easy Steps – Starry Nova

Obtain the right glass. Choose solid grinding tools. Choose the best position to work on mirrors by hand. Grind the back flat. Try and prevent astigmatism. After having the ground and face of the mirror flat through the 220, you are good to begin rough grinding the curve into the mirror. Do some fine grinding.

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Building a fixed post mirror grinding machine

Hello all, I'm fascinated by those who can grind and figure their own mirrors for reflecting telescopes. With the availability of kits to finish beautiful ATM dobs from companies like dobstuff, the lure of building one's own scope to high tolerances an…

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How to Grind a Telescope Mirror in 10 Easy Steps – Starry …

You can then choose one among several ways of supporting your mirror on the grind. Sixth Phase: Rough Grinding After having the ground and face of the mirror flat through the 220, you are good to begin rough grinding the curve into the mirror. You can use #60 carborundum tools for grinding.

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Fabrication and Testing of the 1.2m SAO Primary Mirror

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 ... SAO mirror fiducial layout for distortion correction To verify clear aperture three fiducials are placed on the circle of 1200 mm diameter as in Figure 10.

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Grinding a 25-Inch F3 Telescope Mirror: Thinning and ... - YouTube

Gordon started with a 2" thick telescope mirror that weighed about 70 pounds. By thinning the blank, he's lightened the mirror by about 20 pounds! This vid...

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Mirror Grinding Trouble : telescopes

Mirror Grinding Trouble. Hello! I am currently working on grinding my first primary mirror for a 6" Dobsan but have run into some difficulty. Despite trying several things the focal length will not go lower than 60". The mirror is Pyrex (I think) and Im grinding on a plate glass tool. It is a very old Edmund Scientific Kit that I got for free.

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Telescope Mirror Grinding Machines | Crusher Mills, Cone …

Panasonic HDC-SD60 Telescope mirror grinding machine, Grinding 10" pyrex blank for telescope mirror. Newport Glass Works, LTD. Grinding, Polishing and Figuring …. Grinding, Polishing and Figuring . Thin Telescope Mirrors . Abridged from an article appearing … are several ways to support the grinding and polishing machine ….

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Build your own telescope part 1: The mirror

Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telescope (e.g. F/D = 4) well suited for deep sky observations. …

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Mirror grinding question | Astromart

Mirror grinding question Started by Grumpy_one, ... On my current mirror (10 inch), I finished 60 grit at f6, but by the time I got to 320 grit I was down to f5.2 (I'm currently at f5.6-5.7 but that's a long story.) The other people in my class doing 10 inchers had similar results. I would guess that you will be at an even greater danger of ...

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Mirror grinding - Telescope making

Add the usual half teaspoon of grit, sprinkle with water and grind for a couple of minutes, rotating tool and mirror often. Rinse the mirror and inspect the grid lines. If the grid is worn out evenly, you are doing fine. If you grinded with …

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Building a fixed post mirror grinding machine

Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4 ... 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".

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Parabolic telescope mirrors - R.F. Royce

Conical mirrors in 6, 8, 10, 12.5, 14.5 and 16 inch sizes. Go here for details. My mirrors are made to the following design and use specifications. Wavefront accuracy having an RMS of .032 and a Strehl Ratio of .96 or better at 633 nm for apertures up to 10" at f/5 or larger. Mirrors up to 16" and f/5 or larger have a w avefront accuracy having ...

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Making a 25 inch F2.6 mirror - BBAstroDesigns

A lightweight mirror makes the work of grinding, polishing and parabolizing so much easier. Astigmatism is not an issue for such a large fast mirror. A simple mirror cell suffices (9 point where each point supports a 2 inch diameter pad back support, 2 …

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Telescope Mirror Kits - Firsthand Discovery

Add to Cart. 8 Inch Telescope Mirror Kit. $219.95. Add to Cart. 10 Inch Telescope Mirror Kit. $345.00. Add to Cart. Abrasives, Polish and Pitch Kit (4.25 Inch Mirror) $39.95.

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Nikon F6 + Mirror Lockup | Photo.net Photography Forums

NO! you cannot use a lens that requires traditional Nikon mirror lockup with the Nikon F6, D2H (s) or D2X. The mirror does return after each exposure. Since Mirror-Up as Nikon calls it is a mode and is set by the film advance mode dial on a film SLR or the mode dial on DSLR (s) it is set until changed intentionally.

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8inch f6 mirror issues - ATM, Optics and DIY Forum - Cloudy Nights

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.

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Mirror Grinding F6 - tdair.fr

Mirror grinding - scope making. A good starter size is the 150 mm (6") mirror. A 200mm (8") will also work. Most ATM books and websites recommend a Pyrex® mirror blank, but in my opinion, annealed plate glass is better for this first, "learn and practice" mirror.It is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like …

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Finally got to the fine grinding stage for my 8" F6 …

Finally got to the fine grinding stage for my 8" F6 telescope mirror! Close. 101. Posted by u/[deleted] 2 years ago. Archived. Finally got to the fine grinding stage for my 8" F6 telescope mirror! 16 comments. share. save. hide. report.

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Mirror Grinding Machine

My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telescope mirrors. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Over the years, I'd been collecting motors, gear boxes, …

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Grinding my first 6" f/8 Telescope Mirror - YouTube

This video shows a few initial stages of making a primary mirror for a 6" f/8 telescope. I'm a newbie so bear with me in my ignorance as a first timer making...

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Joy of Mirror Making: Fine Grinding - BBAstroDesigns

For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the …

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Stellafane ATM: Mirror Making Overview

Mirror Grinding at the Spring 1998 Stellafane Mirror Workshop in the McGregor Observatory Rough Grinding. The purpose of rough grinding is to start to cut a spherical concave surface into the mirror blank. For a 6" mirror with a 48" …

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Stellafane ATM Main Page

Amateur Telescope Making Main Page. Russell Porter. Grinding a Mirror. "For it is true that astronomy, from a popular standpoint, is handicapped by the inability of the average workman to own an expensive astronomical telescope. It is …

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Mirror Grinding F6 - tuinprojecten-verbist.be

First mirror grind advice - DIY Astronomer - Stargazers … I bought my first Mirror Kit from Charles Frank in Glasgow, way back when Methuselah was a lad. It had two superb 8.25" Pyrex Blanks, and enough Grinding materials to make a 8" f6 mirror.

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24" F/6 thin telescope mirror grinding 3/4" plate

I know it is bordering on the edge of extremely thin with a 32:1 thickness ratio but it is possible as John Dobson has been known to …

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8" F6 Mirror Grinding - Dr. Debug

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 …

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Stellafane ATM: Measuring Sagitta

Calculating Sagitta. Before you start grinding, you should have decided on your mirror's desired focal length. The two most common beginners' mirrors, the 6" f/8 and 8" f/6, both have 48" focal lengths. Use this formula to calculate your …

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24" F/6 thin telescope mirror grinding 3/4" plate - Cloudy Nights

I have made three workable mirrors in the 20+ size. Two 22" ers of f5.36 and f5.23 and a 25" f4.68. I have to say that the big problems are mount related "astigmatism" and "potato chipping". These effects are difficult to control in the telescope when in use, more so as mirror diameter increases. Currently I have the 25" mirror in the scope.

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Tank armour for grinding F6 | Hypixel - Minecraft Server and Maps

I do have one f6 completion but it was me getting a free carry. I want to know what armor to buy for f6 grinding as a tank who has a legendary level 100 blue whale, full sa legendary, and a mythic livid dagger. Also the sa armor was from I was a berserk main. I also may add I take a lot of damage and do die often in F6

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Basics of Mirror Grinding

The initial rough grinding process uses grit sizes of 60, 120, and 180 to carve out the basic spherical cavity. The mirror is then fine ground with grits of sizes ranging from 220-900. In both grinding processes, the grit is harder than the mirror blank and tool, resulting in a concave mirror and complementary convex tool.

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