The lost story of the original Elgin Sewing Machine Company intrigues us. There must be more to what went on than is being recorded. If the company could make bicycles, sewing machines, and cars, including electric models, there has to be something about that company and its owner that made them special.
Wanting To Grind A 20" Mirror. Where Do I Start? - posted in ATM, Optics and DIY Forum: Im a complete newbie on this, other than my huge enthusiasm for wanting to look up at the night sky through a telpe. I want to build a Dobsonian using a 18 mirror. Is this a tough undertaking and dangerous for a new person? Should I be really …
Mirror Grinder - posted in ATM, Optics and DIY Forum: Ive gathered a few parts to start a mirror grinder. Im thinking of starting with a simple tub grinder with the idea that I can convert it to an Elgin style grinder later on. I found a 62RPM, heavy duty gear motor today to power the spindle which Im making from a hardened, chrome plated 1 …
This is how you make a telpe mirror out of a hunk of glass: Use a sand mixture and another piece of glass to grind away the middle of a concave shape. Repeat with finer and finer grit sand. Dave Barosso demonstrates the technique, but to do it yourself, try to visit one of the Telpe Makers Workshop's classes on Friday nights in …
The mirror grinding machine that Leonardo designed was an innovative and efficient mechanism for producing high-quality optical surfaces. It was based on the use of a rotating tool that was driven by a series of gears, which allowed for precise control over the grinding process.
The mirror machine came to me as a result of astronomical horse-trading, swapping a large GEM mount and a 8" Newtonian OTA for the machine as it was and a start kit consisting of two 6" blanks and the grit, rouge and pitch to manufacture a mirror. The grinding machine had been built to the design of the mirror-o-matic design of Dennis …
Country Store Coffee Grinder, Elgin National Coffee Mill #42, cast iron w/orig paint, transfers & receiver, c.1890, Exc cond, 29"H x 16"W x 17"D.
Among the machines shown, see the Elgin-Waineo machine. This is probably the most common type of machine. Disregard the comment by the writer about …
You'll want to first determine the shape of your mirror and the focal length that it will eventually have. When designing a telpe of this style, there is a very, very handy tool called Newt for the Web.You can put in your …
I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work.
I've narrowed it down to either an Elgin/Waineo design (like the M-o-M), with a single crank driving the overarm, or a Zeiss machine, with two cranks that can be set …
Herb's Glass & Mirror, Inc provides residential glass, commercial glass, mirrors, furniture glass, and auto glass to customers in the Elgin, Dundee, St Charles area. Contact Info (847) 888-4527
Grinding Large Thin Mirrors Part I Grinding,Polishing and Figuring Large Thin Mirrors - Part 2 - Polishing Astronomy, telpe making,mirror grinding and testing Large Thin Mirror Making by Mel Bartels Grinding Machines Mirror-o-matic Tom Waineo's Desktop Grinding/Polishing Machine Ken Lilja's Grinding Machine Grinding Machine Figuring
Locking Stirrups, Block for Specimen Grinding Machine. $225.00 HC-2980.5 Abrasive Grinding Sections for Specimen Grinding Machine. $150.00 HC-2980.6 Specimen Grinding Machine, Diamond Grinding Sections. $85.00 Add to Saved Cart Add to Cart. Related Items. H-2970.XX Transport Rack for Concrete Test Cylinders ...
Testing a mirror blank for residual stress - posted in ATM, Optics and DIY Forum: I am planing to make a mirror and have been building an Elgin type mirror grinding machine which is now mostly completed. Recently I bought a mirror blank which is 20 inches in diameter, 2 inches thick with a f4.5 pre-generated curve. It is presumed to …
DESCRIPTION: Number 46 Elgin National cast iron countertop coffee grinder marked for Woodruff & Edwards Co. Elgin, Ill. Red paint with stenciling.
DOI: 10.1016/S0890-6955(96)00092-2 Corpus ID: 109025261; Mirror surface grinding of ceramics using a three-axis precision cnc grinding machine @article{Kim1997MirrorSG, title={Mirror surface grinding of ceramics using a three-axis precision cnc grinding machine}, author={Hyun Surk Kim and Dai Gil Lee}, …
Page 1 of 3 - Many mirror grinding techniques I found: - posted in ATM, Optics and DIY Forum: First is making a fixed post mirror o matic. I might even use this now. It works both for hogging and polishing. Watched it on you tube but am adding my explanation where missing. I watched this on YouTube last night and I also read an …
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The coffee grinder is missing both wooden handles and has scuffs, scratches & imperfections. The manual power source adds to the charm and authenticity of the grinder. Made by Elgin National, it features double wheel …
Page 1 of 2 - Constructing a Grinding Machine for large apertures - posted in ATM, Optics and DIY Forum: Ive been using a 4.5 equatorial from Orion for many years now and Ive finally got the time and money to build a telpe from the ground up. Unfortunately my local astronomy club has no-one with experience with ATM-ing. Given …
Grinding Machine. Elgin Style Grinding Machine. … The turntable, at approximately 24 volts, runs at 33 rpm with the 6.5" mirror and 10 pounds of weight and 24 rpm around 18 volts. ... Mirror grinding machine Have any of you ever built one of these? … I'm starting to work on an 8" mirror now and plan on moving on up the sizes. mirror ...
I recently built a mirror-o-matic machine, and have attempted to grind my first mirror. Ironically, I am finding working the glass to be more difficult and frustrating …
Page 1 of 4 - Grinding a 6 inch Mirror - posted in ATM, Optics and DIY Forum: Hey Everyone, I first made a 6 f/10 telpe back in 2002. It was, as everyone called it here the minimum size you should make. So I went ahead with it. The f/10 was because some gentleman had ground the glass to f/10 and abandoned it in the local …
I eventually decided I needed to build a dedicated edge grinding machine. This is how I did it. I started the build by making a sturdy frame for the unit out of 2x4 lumber and 3/4 inch thick plywood.
Hello all, I'm fascinated by those who can grind and figure their own mirrors for reflecting telpes. 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 and good performance is clearly doable.
A commercially available single-crystalline diamond (001) substrate measuring approximately 3 × 3 mm 2, grown by the HPHT method was used as a specimen to be mirror-ground.As shown in Fig. 2 (a), the substrate was fixed to the center of a 76-cm-diameter stainless-steel base mounting plate by using an adhesion wax with a …
In our shop we use fixed-post grinding and polishing, then parabolizing with an Elgin style system. Fixed-post machine grinding is where the mirror is on a turntable rotating around, and a 75% tool is on top. They are …
A mirror making machine enables the optician to multitask as well as save their own bodies from the horrors of mirror making work, and is highly repetitive promising a better surface of revolution [hopefully]. Small mirrors can get just plain boring to push around, but large mirrors can be physically demanding and detrimental to your arms, back ...
Elgin/Waineo vs Zeiss machine? - posted in ATM, Optics and DIY Forum: Im getting ready to start the design phase of a smallish mirror/lens grinding/polishing machine (6-20 aperture), and Im at a fork in the road. Ive narrowed it down to either an Elgin/Waineo design (like the M-o-M), with a single crank driving the overarm, or a Zeiss …
Elgin-Waineo machines : . This is the most common type of machine at the moment, in industry as well as with amateurs, chiefly on the American continent (see figure F).The main difference from the previous model lies in its single off-set arm (1) that oscillates around an axis (2) and is connected to a crank (4) and spindle (3) system which makes it work.
The mirror does not have to be perfectly spherical after polishing, but it should not have a TDE. I never use another tool then 75% for polishing, with overhang 14-15% of the tool diameter and a little side swing. ... in high school, in my apprenticeship, I learned to use the Elgin. mulitple spindle Polishing Machine in 1957 and in the 1960's,
Turning the screw-eye raises and lowers the grinder height in minute increments. A flap of Velcro holds down the trigger on the grinder so it is always on. The grinder is controlled from a remote air valve in the air …
My first mirror is an 8"/f5 that was done by hand. Since then I had to have surgery on my right shoulder,so I am wanting to build a grinding machine. I have found some info on …
Understanding the positioning and curvature of the mirror is vital. The mirror's shape determines how incoming light is focused. A parabolic mirror – where all incoming light beams parallel to the mirror's axis converge at a single point – is ideal for a DIY Telpe. Achieving this perfect shape may be challenging, and that's where ...
This device makes it possible to place the mirror on top, which is impossible with the Draper machine. Removing the top disk thus becomes easier, as well as adding pressure onto it with weights whenever …
Your mirror might look pretty smooth and nicely finished at the end of fine grinding, but in reality it's pretty rough. You'll need to polish it to achieve the ultimate smoothness required to ensure that it reflects all the …
The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the …
View this item and discover similar for sale at 1stDibs - Elgin national coffee mill counter grinder. This amazing coffee grinder has all original mechanisms. The wheels turns freely. The coffee holder works perfectly. ... Mirrors Rugs & Carpets Wall Decor Clocks Pillows and Throws All Home Accents. More Ways to Shop.
