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Old Autocollimator Parts
I am reluctant to put loctite onto a part without being sure that I will be able to remove the part. But your point is a good one. A bit more info... here is a photo of the same interface, found on the internet, but with a mechanical rather than electronic setting system at the back end... -
Old Autocollimator Parts
The flange is too thin for two holes and a pin wrench, I expect it will just deform and break. If you're right that it's pressed then it's just a matter of making a piece with the correct thread. This will be easy if it's an inch thread, not so easy if this is a BA thread like most (all?) of... -
Old Autocollimator Parts
The slide for the setting lines and photo-electric chopping system is missing too many parts, so I am going to replace it with a focal-plane camera. But I can not figure out how to remove the body, show below: I pulled out the four cap-head screws from the oval shaped circular slots, and the... -
reducing OD of a glass lens on a cylindrical grinder
I just bought the CBN wheel, as you say, it will at least be useful for other things. Also, a CBN wheel can't blow up in your face, ought to be safer than vitreous. Is that right?- ballen
- Post #44
- Forum: Abrasive Machining
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Old Autocollimator Parts
I came across a plastic (acrylic) lens of the correct focal length for under 3 Euros, so decided it would be interesting to see if this got the autocollimator working: https://schenkspass-shop.de/Acrylic-lens-OptiMedia-OM10-O-62-mm-f-275-mm I turned it down to the correct diameter, made up a... -
reducing OD of a glass lens on a cylindrical grinder
Ay, there's the rub! So, for grinding my glass part, would you take door A or door B? Buck, how about you? Or should I hold out for a diamond wheel? A) new 300 x 20 x 127 SIC 46 JV for 65 Euros, including shipping, or B) 300 x 20 x 127 CBN 126 grid wheel in my post #32 above, about the same...- ballen
- Post #40
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
Hi Buck, sure, I can get those in Germany, I have a 200mm one for my surface grinder. But for my cylindrical grinder it is too small, I need a 300 mm (12") diameter wheel with a 127mm (5") hole. Those seem to cost a lot more. Cheers, Bruce- ballen
- Post #37
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
I know that diamond would be better but can't justify the expense for this one-off. Hence my question, would CBN work? (I have in mind something that Buck wrote a long time ago, which is that if you know what you are doing, almost any wheel can be used, it is just not ideal. But obviously...- ballen
- Post #35
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
My friend Karl says that the B in "B126" means CBN. Other questions are still open...- ballen
- Post #33
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
I've just been asked if I want to buy this used wheel, 300 x 20 x 127mm, which is the right size for my cylindrical grinder. Could one of the pros please help me out, to answer a few questions? Is it CBN or diamond? Would it be a good choice for glass? What would be a good price to offer for...- ballen
- Post #32
- Forum: Abrasive Machining
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Mitutoyo Museum Virtual Tour
Is there any way to read the text on the display cards? When I get as close as possible, it is still too blurry to read. I'd like to know what I'm looking at... -
A Deckel part and why I think Ebay has become largely irrelevant (Germany)
Here in Germany Ebay has lowered the prices: starting on March 1st 2023, they have dropped the 10% fee for private sellers. I now find it quite a good deal and effective at reaching a large number of people. Some details are here...- ballen
- Post #16
- Forum: Deckel, Maho, Aciera, Abene Mills
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A huge dial indicator. Why?
I have a handful of old KS (Feinmess Suhl GmbH) measuring instruments including some 1 micron resolution passameters and 1 micron resolution inside bore gauges. The quality is outstanding. I have taken several of them apart over the years because they were sticky. Removing the varnish inside... -
Is this a Hilma Hydraulic Vise from the 1960's ?
I'm not sure if this answers your question, but the procedure for filling the vise with oil requires that it be pumped in under pressure. I typically fill the vise with oil, then use compressed air (a bike pump) to put the oil under some pressure. Then I top it up to the brim. When you screw...- ballen
- Post #27
- Forum: Deckel, Maho, Aciera, Abene Mills
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Old Autocollimator Parts
The lens arrived from China (link above). It looked very good, but the focal length was 220-230mm, not the promised 270mm. A new lens is on order, this one supposedly FL 282mm. Here's the link: doublet lens with FL 282mm. -
reducing OD of a glass lens on a cylindrical grinder
The lens arrived from China. A quick check (sunny day outside, focussed the image of the neighbours house seen through a window onto a sheet of paper taped to the wall) showed that the focal length was 220-230mm, not the advertised 270mm. A shame, because the lens looked to be very well made...- ballen
- Post #31
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
I saw that also. For eyeglasses you only need to center a lens to 1 or 2mm. Typically an optician tells you to look straight ahead then measures where your pupil lies relative to the frame with a ruler. The 60-grit rougher was what made me wonder why you had recommended a resin wheel and not...- ballen
- Post #26
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
Not too late, the lens will probably arrive tomorrow. Still trying to decide how to hold it. What's "optician's wax"? Sounds like a good idea...- ballen
- Post #24
- Forum: Abrasive Machining
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reducing OD of a glass lens on a cylindrical grinder
Thanks, that's encouraging. Was the CBN wheel a plated or sintered bond? Or resin? I don't want to use hot glue, am afraid it will break and/or damage the reflective coating. Instead I plan to capture the lens between centers, metal on one side, plastic on the other. I'll turn the metal...- ballen
- Post #23
- Forum: Abrasive Machining
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Old Autocollimator Parts
A couple of days ago, the 50/50 beam splitter arrived from China. It's 1.1mm thickness, 25.4mm diameter (round), last item on the pull-down list here. To mount it, I needed to shape it into an ellipse. I wasn't confident that I could scribe and break it, so instead I ground it to shape. The...