How to unstick center disk of round slide rule?
in [Design]
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From: John Ferrell on 21 Feb 2010 13:37 On Fri, 19 Feb 2010 20:21:09 -0600, "Dave M" <dgminala4444(a)mediacombb.net> 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. Gun stores carry a spray lubricant that leaves a dry teflon powder. Pretty slick! John Ferrell W8CCW
From: life imitates life on 21 Feb 2010 14:02 On Sun, 21 Feb 2010 13:37:17 -0500, John Ferrell <jferrell13(a)triad.rr.com> wrote: >On Fri, 19 Feb 2010 20:21:09 -0600, "Dave M" ><dgminala4444(a)mediacombb.net> 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. >Gun stores carry a spray lubricant that leaves a dry teflon powder. >Pretty slick! >John Ferrell W8CCW Food grade dry "mold release" agent. Comes in spray cans. Bearing lube in squeeze tubes, etc.
From: Phil Hobbs on 21 Feb 2010 14:22 On 2/19/2010 9:31 PM, Joerg wrote: > 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. > Chalk dust tightens it--use graphite. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: life imitates life on 21 Feb 2010 14:45 On Sun, 21 Feb 2010 14:22:49 -0500, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >On 2/19/2010 9:31 PM, Joerg wrote: >> 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. >> > >Chalk dust tightens it--use graphite. > >Cheers > >Phil Hobbs Yeah sure... all those gray smears on the white backdrop of the ruled faces would surely be desirable.
From: Dave Platt on 21 Feb 2010 14:49
In article <28v2o5lkvva83khijhuv2rmc850bhtam74(a)4ax.com>, John Ferrell <jferrell13(a)triad.rr.com> wrote: >>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. >Gun stores carry a spray lubricant that leaves a dry teflon powder. >Pretty slick! .... both literally and metaphorically :-) I've used dry-Teflon lubricants on slide rules, with good results so far. I've tried two types: - micro-fine dry powdered Teflon. Bought this from a piano- servicing-supplies company, of all places - a bit of this is brushed on the hammer mechanisms to prevent squeaking. It can be applied to a slide rule's sliding parts with a fine brush. This works nicely on both plastic and wood rules (although I've read that bamboo rules shouldn't need added lubrication if the wood surfaces are clean - bamboo is somewhat self-lubricating). - Miller-Stephenson PFTE release agent / dry lubricant. This is a very finely divided PFTE Teflon, suspended in a fast-evaporating solvent carrier... I wipe it on with a Q-tip. The Miller-Stephenson liquid seems to work really well as a lubricant for the Pickett metal slide rules, including the old models such as the Model 2 and Model 1000 which are made of magnesium (tends to oxidize and corrode over time). A few years ago I bought a Model 2 at a local flea market which was completely stuck... corrosion had frozen the slide in place and it wouldn't moved. I disassembled the whole thing, soaked it in soapy water, carefully scrubbed off the corrosion, lubricated the sliding surfaces with the M-S stuff, and reassembled it... and it now works perfectly, just as smoothly as if when brand new. -- Dave Platt <dplatt(a)radagast.org> AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |