How to unstick center disk of round slide rule?
in [Design]
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From: Jim Thompson on 20 Feb 2010 11:04 On Sat, 20 Feb 2010 12:38:41 +0000, Gaius <bin(a)127.0.0.1> wrote: >life imitates life wrote: >> On Sat, 20 Feb 2010 02:02:07 -0800, Robert Baer <robertbaer(a)localnet.com> >> wrote: >> >>> Joerg wrote: >>>> Gents, >>>> >>>> My round slide rule is developing a sticky center wheel. I can still >>>> move it but afraid my thumbs will rub off the lettering over time. It's >>>> this model: >>>> >>>> http://sliderulemuseum.com/SIC/C35_SIC_SINCO_250_1962.jpg >>>> >>>> Obviously the old "rub with a bar of soap" trick like on the linear ones >>>> doesn't work here. I also haven't tried any semi-destructive methods to >>>> pull it off. Any safe tricks to unstick it? >>>> >>>> I usually use the linear one but on the road this slide rule is nice >>>> because it fits into the shirt pocket. >>>> >>> If you can gently wash it with mild soap and water, then dry it, that >>> should do the job. >>> But if that is not sufficient, one can add a drop or two of Labelle >>> plastic compatible gear oil (used by model railroaders and other modelers). >>> 40 years ago i got a 14.9ml bottle of it and a only half way thru it. >> >> Goo off or lemon oil. > >I've used a thin silicon oil for this - and a slide rule I had many >years ago (Blundell-Harling ?) appeared to have been treated with this >by the manufacturer. Just the slightest smear, of course. Good idea! I have a spray silicone lubricant that I use to 'fix' many a problem. It's so good you have to be cautious that some mist doesn't land on the tile floor... as Joerg would say, "Slip... *Splat*" ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: whit3rd on 20 Feb 2010 13:31 On Feb 19, 5:46 pm, Joerg <inva...(a)invalid.invalid> wrote: > My round slide rule is developing a sticky center wheel. I can still > move it but afraid my thumbs will rub off the lettering over time. It's > this model: > > http://sliderulemuseum.com/SIC/C35_SIC_SINCO_250_1962.jpg Silicone oil, usually good with plastics and enameled aluminum, or a dry lube based on hexagonal boron nitride (this is sold as a white powder "lock lube" in most hardware stores). The solid is a bit less messy if you have difficulty controlling the delivered quantity.
From: life imitates life on 20 Feb 2010 14:04 On Sat, 20 Feb 2010 12:38:41 +0000, Gaius <bin(a)127.0.0.1> wrote: >life imitates life wrote: >> On Sat, 20 Feb 2010 02:02:07 -0800, Robert Baer <robertbaer(a)localnet.com> >> wrote: >> >>> Joerg wrote: >>>> Gents, >>>> >>>> My round slide rule is developing a sticky center wheel. I can still >>>> move it but afraid my thumbs will rub off the lettering over time. It's >>>> this model: >>>> >>>> http://sliderulemuseum.com/SIC/C35_SIC_SINCO_250_1962.jpg >>>> >>>> Obviously the old "rub with a bar of soap" trick like on the linear ones >>>> doesn't work here. I also haven't tried any semi-destructive methods to >>>> pull it off. Any safe tricks to unstick it? >>>> >>>> I usually use the linear one but on the road this slide rule is nice >>>> because it fits into the shirt pocket. >>>> >>> If you can gently wash it with mild soap and water, then dry it, that >>> should do the job. >>> But if that is not sufficient, one can add a drop or two of Labelle >>> plastic compatible gear oil (used by model railroaders and other modelers). >>> 40 years ago i got a 14.9ml bottle of it and a only half way thru it. >> >> Goo off or lemon oil. > >I've used a thin silicon oil for this - and a slide rule I had many >years ago (Blundell-Harling ?) appeared to have been treated with this >by the manufacturer. Just the slightest smear, of course. Yes, silicon oil typically does not attack most polymers. That was the main reason I suggested the lemon oil based stuff, which is also pretty benign in this regard.
From: Joerg on 20 Feb 2010 16:01 Paul Hovnanian P.E. wrote: > Joerg wrote: >> Dave M wrote: >>> Joerg wrote: >>>> Gents, >>>> >>>> My round slide rule is developing a sticky center wheel. I can still >>>> move it but afraid my thumbs will rub off the lettering over time. >>>> It's this model: >>>> >>>> http://sliderulemuseum.com/SIC/C35_SIC_SINCO_250_1962.jpg >>>> >>>> Obviously the old "rub with a bar of soap" trick like on the linear >>>> ones doesn't work here. I also haven't tried any semi-destructive >>>> methods to pull it off. Any safe tricks to unstick it? >>>> >>>> I usually use the linear one but on the road this slide rule is nice >>>> because it fits into the shirt pocket. >>> >>> If your slide rule has plastic-on-plastic ot plastic-on-metal, talcum powder >>> should work. Disassemble to the point where the center can be cleaned with >>> water/detergent solution, then dry completely and lube with dry talcum >>> powder. >>> >> Done, but as Jim hinted, if it's buckled it's too late. And mine is :-( > > Don't try this until your only alternative is to throw it out. > > I have a 'Dead Reckoning Computer', a pilot's circular slide rule with a > rectangular plastic panel that slides back and forth through the center. > The slide had become so warped that its previous owner broke it in half > trying to pull it through the body*. > > I extracted both pieces and expoxied them back together. Then, I placed > the slide between a couple of hand towels and applied a warm iron to > soften the plastic. one it softened (I gradually increased the iron's > heat), I placed it between two heavy books (thanks Winfield for the > AofE) until it cooled and remained flat. > > *I hope this didn't happen to the pilot during flight. There were some > notes mentioning "Howland Island" that came with it, so I hope they made > it OK. Thanks for the hint. I'll try, but first I'll ask a guy who seems to be a slide rule enthusiast: http://public.beuth-hochschule.de/~hamann/ -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 20 Feb 2010 16:01
Martin Riddle wrote: > "Joerg" <invalid(a)invalid.invalid> wrote in message > news:7u90fsFrohU4(a)mid.individual.net... >> Dave M wrote: >>> Joerg wrote: >>>> Gents, >>>> >>>> My round slide rule is developing a sticky center wheel. I can still >>>> move it but afraid my thumbs will rub off the lettering over time. >>>> It's this model: >>>> >>>> http://sliderulemuseum.com/SIC/C35_SIC_SINCO_250_1962.jpg >>>> >>>> Obviously the old "rub with a bar of soap" trick like on the linear >>>> ones doesn't work here. I also haven't tried any semi-destructive >>>> methods to pull it off. Any safe tricks to unstick it? >>>> >>>> I usually use the linear one but on the road this slide rule is nice >>>> because it fits into the shirt pocket. >>> >>> If your slide rule has plastic-on-plastic ot plastic-on-metal, talcum >>> powder should work. Disassemble to the point where the center can >>> be cleaned with water/detergent solution, then dry completely and >>> lube with dry talcum powder. >>> >> Done, but as Jim hinted, if it's buckled it's too late. And mine is >> :-( >> >> So, scrape marks in the aluminum and the plastic wheel. Maybe if I >> could find really thin Teflon I can get some more life out of it. They >> don't make'em no more. > > Maybe not the SIC but... > Concise still does <http://www.concise.co.jp/eng0731/slide.html> > Aha, still made, who'd a thought ... thanks! -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |