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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Organization: D and D Data Followup-To: On 2012-02-23, Michael A. Terrell wrote: "DoN. Nichols" wrote: On 2012-02-22, Michael A. Terrell wrote: I'm talking about the all mechanical cash registers that were the main products of NCR. The had several large buildings in the Dayton area that were machine shops cranking out all the parts to feed their assembly plants. They started building them over 100 years ago. O.K. I thought that we were still talking about the NLS digital voltmeter readouts. :-) Sorry, I thought 'NCR' was enough information. Of course I grew up near there and knew some employees. I was expecting NLS, and saw a TLA which started with 'N', so I stopped reading. :-) [ ... ] We had a large DataProducts drum printer on the SATE for the PRC-77. It would shake the entire computer booth when it printed a line of asteriks to signal a failure. I was there one day when the engineer from Data general was doing a core dump to the printer. it didn't have a refolder, so the paper was sraying off the ceiling. ;-) I can believe it. Years later, I had to scrap a tractor trailer load of those printers, along with a trailer full of VAX based CAD systems that had come off lease. The owner wanted cerified destruction to keep them off the market. It made me sick to trash the uncased NTSC studio grade monitors. but the contrast said they could not be resold. A lot of small TV stations would have paid $1000 each for them, for spares. Ouch! That truly hurts. To what level did they have to be destroyed? Individual board level in the VAXen? I can understand trashing the software, and perhaps even the hard disk packs, but at the generic component level, that is painful. Those could have been used to repair many non-competing VAXen. I wonder why they make the polarized DC versions? Perhaps brighter? I didn't see a clue that the AC ones cost any more -- though they *should*. :-) Probably for the anal retentive types? Also, it would allow for simple bicolor indicators, by simply inverting the polarity if two are wired in parallel. As long as they could tolerate the full reverse voltage. I didn't look up the specs on the individual lamps. but colored lamps would eliminate the need for those tiny colored silicone rubber covers. The ones which tended to tear when you tried to pull them over the rim of the bulb sleeve, or when you pressed on them to eject a bad bulb. :-) Who was it -- Honeywell -- who made those switch assemblies. I know that MicroSwitch made the snap-on switch elements. Master Specialties. I may still have a new switch or two left. http://www.marineairsupply.com/catalogs/10_Series.pdf Yep -- those are the later ones I remember. The earlier ones were made by Honeywell, and had little tabs which stuck out either side at slightly different depths, which engaged gray divider/barrier modules, so a stack of them would couple together and snap into the panel all at once. On those, the fronts fully removed, and a special tool would reach in and unlatch the lamps and remove them for replacement. I think that I have a few of each style -- somewhere around here. :-) I first saw the 327/328 lamps on a tour of the VOA Bethany facility while it was being upgraded from the original design. It was one tech's job to wander around the facility to test & replace bad lamps. There were over 3,000 in use, and they were still installing new equipment. With a pushbutton on each panel to light all bulbs on that panel? There were such on the flight simulator instructor's control panel which a company I worked for for a while made. They used the switch itself, with the console in diagnostics mode. He would just push a switch, then pull it out with what looked like an IC extractor and replace a bad lamp, and test again. O.K. This company mounted a T-bar relay every so often on the back of the panels to switch *all* lamps to test voltage at once. As for the Master Specialties switch/lamp assemblies, you didn't need an IC extractor, as long as you had fingernails on the thumb and index finger. Just grab notches in the two ends of the clear front plate, pull and twist. BTW I've trimmed the accumulated "References: " header. I've had problems in the past when it got past a certain length, though I think that my modification to my preferred editor, jove, has fixed that. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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