rough grinding bartels

July/August 1994 Gear Technology

 · bing. gear grinding and honing machines. as well a CNC gear cutting lapping and cham-ferirtgldeburring machines plus innovative tool-ing and workholdmg Come see .15-second hob changes. totally automatic dressing and grinding and more. Complete gear processing technology for spur helical bevel or hypoid gear. GMl. Independence OH(8oot11

Homemade Telescope MakingGoogle Search

Next I ground down the rough edge using a grinding stone and water and created a reasonably round disk 2 3/4 inches in diameter. This lens blank had a positive meniscus shape. For the lens grinding tools I used the bottoms from two other jars. I did not bother grinding the edges of these tools so that they were nice and smooth.

Abrasive Machining of SiliconScienceDirect

 · The inner grindingring has the large grit size for rough grinding whereas the outer ring is provided for fine grinding. The two grinding rings are arranged in such a way that either the rough-grinding- wheel or the fine-grinding-wheel can be put in contact with the workpiece whereby the other grinding wheel is not activatetl 13.9.3.171.

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Abrasive Machining of SiliconScienceDirect

 · The inner grindingring has the large grit size for rough grinding whereas the outer ring is provided for fine grinding. The two grinding rings are arranged in such a way that either the rough-grinding- wheel or the fine-grinding-wheel can be put in contact with the workpiece whereby the other grinding wheel is not activatetl 13.9.3.171.

Telescope Mirror MakingFrontier

 · Wood I don t hear a lot about people using wood although I know Mel Bartels uses it for his polishing tools. For grinding the back of my 12" mirror I used an 8" disk of 3/4" particle board glued tiles to the front with epoxy and coated the back and sides with polyurethane. It worked great.

DIY Telescope Courtesy Of IKEA Hackaday

 · Mel Bartels has even used wood as a base for the tiles. For initial grinding of the rough curve with coarse abrasive some workers even use an iron barbell disk. Grinding and figuring one

Stellafane ATM Grits Polish Pitch

Mel Bartels a well respected west coast amateur recommends on his Large Thin Mirror Grinding web page starting with something between 30 and 60 grit and then 120 220 500 (=25 micron) and finishing with 9 micron. This is just a 5 grit sequence as opposed to 8 to 10 for the more traditional sequences usually recommended for novices.

THE JOURNAL OF GEAR MANUFACTURING

 · Senior Editor Nancy Bartels Publishing Assistant Kelli R. Hopkins Technical Editors Robert Errichello William L.Janninck • 3 Grinding spindles available Whee l speeds 2000 to 24000 RPM Std. Spindle 20 IFII.IP. Versatility others just as rough like our

Slumped mirrorsATM Optics and DIY ForumCloudy Nights

 · Thanks Pierre for the recommended sites and thanks too Google Translator. I ve just gone through Mel Bartels inspirational account. His mirrors and your own make my toes in the water 210 x 11mm meniscus project feel reassuringly modest. My challenge will be the predictable control of figure by pressure prior to and during grinding and polishing.

Wooden Telescope Part 1 the Mirror 14 Steps (with

Mel Bartels Amateur Telescope Making. If you work full time on it the rough carving smooth grinding and polishing can all be done within a month. The time consuming part comes from the figuring process. I probably hit all the possible surface errors from turned down edge to central hole and oblong spheroid. 5 minutes of the wrong stroke

Grinding Applied Stage

 · Grinding Applied Stage. Intermediate autogenous grinding can efficiently replace the rod mill and ball mill stage of a conventional grinding circuit The need was shown for closed circuit operation of the last stage of crushing to control the top size of the mill feed A reasonable rate ratio between media and total mill feed was established

Telescope Mirror MakingFrontier

 · Wood I don t hear a lot about people using wood although I know Mel Bartels uses it for his polishing tools. For grinding the back of my 12" mirror I used an 8" disk of 3/4" particle board glued tiles to the front with epoxy and coated the back and sides with polyurethane. It worked great.

What grit sequence do you use for fine grinding ATM

 · What grit sequence do you use for fine grinding posted in ATM Optics and DIY Forum A few centuries ago when I was young I used Willmann-Bells 120 220 320 500 grit SiC then 12 and 5 micron aluminum oxide. Seems an awful lot of sizes compared to what others have recommended. Mel Bartels uses just 120 220 500 SiC and 9 micron Al2O3.

Can I use 19mm thick plate glass to grind 14 inch mirror

 · My grinding machine is next and will be expanded to take up to a 30 inch mirror (currently maxed out at 20 inch). After this I will probably build a jig to grind away the 5 pounds of glass to take the current f/2.2 curve to f/2.8. So I have not started actual work on the glass yet but my plans were always that I would be rough grinding in 2020.

Stellafane ATM Grits Polish Pitch

Mel Bartels a well respected west coast amateur recommends on his Large Thin Mirror Grinding web page starting with something between 30 and 60 grit and then 120 220 500 (=25 micron) and finishing with 9 micron. This is just a 5 grit sequence as opposed to 8 to 10 for the more traditional sequences usually recommended for novices.

Build your own telescope part 1 The mirrorThomas

Making a 6 inch F3 Mirror/DobATM Optics and DIY Forum

 · I was reading through Mel Bartels website and the site and sketches from his 6 inch f/2.8 were just too cooli have to see those views The 6 inch f3 will also be TINY like a tabletop/ handheld dob The question isdo i want to make it f/3 or f2.8 Shoot rough grinding at F/2.9. Then use fine grinding to move the FL ini one direction or

Grinding Applied Stage

 · Grinding Applied Stage. Intermediate autogenous grinding can efficiently replace the rod mill and ball mill stage of a conventional grinding circuit The need was shown for closed circuit operation of the last stage of crushing to control the top size of the mill feed A reasonable rate ratio between media and total mill feed was established

Slumped mirrorsATM Optics and DIY ForumCloudy Nights

 · Thanks Pierre for the recommended sites and thanks too Google Translator. I ve just gone through Mel Bartels inspirational account. His mirrors and your own make my toes in the water 210 x 11mm meniscus project feel reassuringly modest. My challenge will be the predictable control of figure by pressure prior to and during grinding and polishing.

Homemade Telescope MakingGoogle Search

Next I ground down the rough edge using a grinding stone and water and created a reasonably round disk 2 3/4 inches in diameter. This lens blank had a positive meniscus shape. For the lens grinding tools I used the bottoms from two other jars. I did not bother grinding the edges of these tools so that they were nice and smooth.

Making a 6 inch F3 Mirror/DobATM Optics and DIY Forum

 · Shoot rough grinding at F/2.9. Then use fine grinding to move the FL ini one direction or the other. F/2.8 may allow wider FOVs. F/3.0 may allow better correction of the FoV with P2. So the question devolves into a) are you more interested in widest possible FoVs or. b) merely really wide FoVs and more pippoint stars It is a fine line to tread.

Can I use 19mm thick plate glass to grind 14 inch mirror

 · My grinding machine is next and will be expanded to take up to a 30 inch mirror (currently maxed out at 20 inch). After this I will probably build a jig to grind away the 5 pounds of glass to take the current f/2.2 curve to f/2.8. So I have not started actual work on the glass yet but my plans were always that I would be rough grinding in 2020.

Groove GrindingBartels Doors

 · Give your door the finishing (groove) touch. We manufacture V- C- and Offcenter grooves in various widths optionally matt or polished. The refraction of light in the glass creates impressive effects that always fascinate.

Can I use 19mm thick plate glass to grind 14 inch mirror

 · My grinding machine is next and will be expanded to take up to a 30 inch mirror (currently maxed out at 20 inch). After this I will probably build a jig to grind away the 5 pounds of glass to take the current f/2.2 curve to f/2.8. So I have not started actual work on the glass yet but my plans were always that I would be rough grinding in 2020.

Wooden Telescope Part 1 the Mirror 14 Steps (with

Mel Bartels Amateur Telescope Making. If you work full time on it the rough carving smooth grinding and polishing can all be done within a month. The time consuming part comes from the figuring process. I probably hit all the possible surface errors from turned down edge to central hole and oblong spheroid. 5 minutes of the wrong stroke

Homemade Telescope MakingGoogle Search

Next I ground down the rough edge using a grinding stone and water and created a reasonably round disk 2 3/4 inches in diameter. This lens blank had a positive meniscus shape. For the lens grinding tools I used the bottoms from two other jars. I did not bother grinding the edges of these tools so that they were nice and smooth.

DIY Telescope Courtesy Of IKEA Hackaday

 · Mel Bartels has even used wood as a base for the tiles. For initial grinding of the rough curve with coarse abrasive some workers even use an iron barbell disk. Grinding and figuring one

Making a 6 inch F3 Mirror/DobATM Optics and DIY Forum

 · I was reading through Mel Bartels website and the site and sketches from his 6 inch f/2.8 were just too cooli have to see those views The 6 inch f3 will also be TINY like a tabletop/ handheld dob The question isdo i want to make it f/3 or f2.8 Shoot rough grinding at F/2.9. Then use fine grinding to move the FL ini one direction or

Grinding Applied Stage

 · Grinding Applied Stage. Intermediate autogenous grinding can efficiently replace the rod mill and ball mill stage of a conventional grinding circuit The need was shown for closed circuit operation of the last stage of crushing to control the top size of the mill feed A reasonable rate ratio between media and total mill feed was established

Slumped mirrorsATM Optics and DIY ForumCloudy Nights

 · Thanks Pierre for the recommended sites and thanks too Google Translator. I ve just gone through Mel Bartels inspirational account. His mirrors and your own make my toes in the water 210 x 11mm meniscus project feel reassuringly modest. My challenge will be the predictable control of figure by pressure prior to and during grinding and polishing.