How to unstick center disk of round slide rule?
in [Design]
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From: Joerg on 19 Feb 2010 20:46 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 19 Feb 2010 20:51 On Fri, 19 Feb 2010 17:46:11 -0800, Joerg <invalid(a)invalid.invalid> 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. Take it apart and carefully clean/de-grease. Then apply talc to the slides. Beware, it may be too late if it warped :-( ...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: Dave M on 19 Feb 2010 21:21 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. -- David dgminala at mediacombb dot net
From: Joerg on 19 Feb 2010 21:31 Jim Thompson wrote: > On Fri, 19 Feb 2010 17:46:11 -0800, Joerg <invalid(a)invalid.invalid> > 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. > > Take it apart and carefully clean/de-grease. Then apply talc to the > slides. Beware, it may be too late if it warped :-( > Thanks, I didn't know you could just peel out the center wheel. Well, it's buckled upwards in the very center and there are serious wear marks underneath on the outer radius :-( Cleaned it real good, gave it a dose of talc but no dice. It does turn ok with wet fingers but I guess spitting into one's hands wouldn't be looked upon favorably in engineering. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 19 Feb 2010 21:41
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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |