How to unstick center disk of round slide rule?
in [Design]
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From: Robert Baer on 20 Feb 2010 05:02 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.
From: life imitates life on 20 Feb 2010 07:13 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.
From: Gaius on 20 Feb 2010 07:38 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.
From: Dave M on 20 Feb 2010 10:51 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> > > > Cheers If there's enough room in the sandwich to put a piece of teflon tape in there, the tape at Ebay item 190368526398 might do. It's 0.0045" thick, and has adhesive on one side. I have a couple pieces of it in a box somewhere, but after my recent move, I haven't a clue which box it might be in. Cheap enough, though. Cheers!!! -- David dgminala at mediacombb dot net
From: Jim Thompson on 20 Feb 2010 11:00
On Fri, 19 Feb 2010 18:51:53 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Paul Hovnanian P.E. 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 can't tell from the photos. Does this have a single center wheel or >> does the disc with the C scale ride on top of the one with the D scale >> (the T scale wheel on the other side would be a separate smaller disc). >> >> If the single center wheel rides inside the outer wheel, can you tell >> how the two are kept flat w.r.t. each other? If this was a straight >> slide rule, it would be a tongue and groove, but I don't see how one >> could assemble (let alone take apart) such a circular device. >> >> Looking at the trig side, I see what appears to be the end of what could >> be a screw in the hub. There's a possibility that one could grab each >> hub and unscrew them, allowing you to remove the cursor. In fact, each >> side of the cursor is attached to its hub and by unscrewing the spacer >> at the end, the center axle may be loose enough to unscrew by >> manipulating the cusrsors (gently). But from there, it depends on how >> the center and outer wheels are configured. >> > >The center wheel is like an inlay but after Jim's hint I was able to >gently pry it out. However, the thing looks a bit damaged inside, >circular grinding marks, maybe from too much use or because the center >has bulged up from the summer heat out here. Possibly the HP11C will >outlive it. Is it a plastic disk? SOMEWHERE is my archives I have such circular one, but the disk is aluminum. ...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. |