How to unstick center disk of round slide rule?
in [Design]
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From: Joerg on 22 Feb 2010 12:00 YD wrote: > Late at night, by candle light, Joerg <invalid(a)invalid.invalid> penned > this immortal opus: > Hey, the power outages were gone after the previous governor got kicked out :-) >> 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/ > > Place it between two glass plates, as heavy as available on top. Leave > in the sun for a few hours, then take back in to cool off. Well, works > for warped LPs. > Got to wait for some global warming first because so far we haven't gotten our fair share in that department. Last night was another freeze night, ice in the stairs :-( Sun? Yeah, there must be some, somewhere behind the clouds. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 22 Feb 2010 12:09 On Mon, 22 Feb 2010 09:00:50 -0800, Joerg <invalid(a)invalid.invalid> wrote: >YD wrote: >> Late at night, by candle light, Joerg <invalid(a)invalid.invalid> penned >> this immortal opus: >> > >Hey, the power outages were gone after the previous governor got kicked >out :-) > > >>> 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/ >> >> Place it between two glass plates, as heavy as available on top. Leave >> in the sun for a few hours, then take back in to cool off. Well, works >> for warped LPs. >> > >Got to wait for some global warming first because so far we haven't >gotten our fair share in that department. Last night was another freeze >night, ice in the stairs :-( > >Sun? Yeah, there must be some, somewhere behind the clouds. The East is about to get slammed again. I just heard that I17 is closed south of Flagstaff... impassable. ...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: Jim Thompson on 22 Feb 2010 12:12 On Mon, 22 Feb 2010 10:09:18 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Mon, 22 Feb 2010 09:00:50 -0800, Joerg <invalid(a)invalid.invalid> >wrote: > >>YD wrote: >>> Late at night, by candle light, Joerg <invalid(a)invalid.invalid> penned >>> this immortal opus: >>> >> >>Hey, the power outages were gone after the previous governor got kicked >>out :-) >> >> >>>> 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/ >>> >>> Place it between two glass plates, as heavy as available on top. Leave >>> in the sun for a few hours, then take back in to cool off. Well, works >>> for warped LPs. >>> >> >>Got to wait for some global warming first because so far we haven't >>gotten our fair share in that department. Last night was another freeze >>night, ice in the stairs :-( >> >>Sun? Yeah, there must be some, somewhere behind the clouds. > >The East is about to get slammed again. I just heard that I17 is >closed south of Flagstaff... impassable. > > ...Jim Thompson Between plates, then apply a hair drier? ...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: Joerg on 22 Feb 2010 12:49 Jim Thompson wrote: > On Mon, 22 Feb 2010 10:09:18 -0700, Jim Thompson > <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >> On Mon, 22 Feb 2010 09:00:50 -0800, Joerg <invalid(a)invalid.invalid> >> wrote: >> >>> YD wrote: >>>> Late at night, by candle light, Joerg <invalid(a)invalid.invalid> penned >>>> this immortal opus: >>>> >>> Hey, the power outages were gone after the previous governor got kicked >>> out :-) >>> >>> >>>>> 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/ >>>> Place it between two glass plates, as heavy as available on top. Leave >>>> in the sun for a few hours, then take back in to cool off. Well, works >>>> for warped LPs. >>>> >>> Got to wait for some global warming first because so far we haven't >>> gotten our fair share in that department. Last night was another freeze >>> night, ice in the stairs :-( >>> >>> Sun? Yeah, there must be some, somewhere behind the clouds. >> The East is about to get slammed again. I just heard that I17 is >> closed south of Flagstaff... impassable. >> >> ...Jim Thompson > > Between plates, then apply a hair drier? > Or apply the wood stove. It's cranking full bore again, in California, in February, one neighbor is almost out of firewood by now ... -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 22 Feb 2010 13:53
On Mon, 22 Feb 2010 09:49:11 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Jim Thompson wrote: >> On Mon, 22 Feb 2010 10:09:18 -0700, Jim Thompson >> <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >> >>> On Mon, 22 Feb 2010 09:00:50 -0800, Joerg <invalid(a)invalid.invalid> >>> wrote: >>> >>>> YD wrote: >>>>> Late at night, by candle light, Joerg <invalid(a)invalid.invalid> penned >>>>> this immortal opus: >>>>> >>>> Hey, the power outages were gone after the previous governor got kicked >>>> out :-) >>>> >>>> >>>>>> 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/ >>>>> Place it between two glass plates, as heavy as available on top. Leave >>>>> in the sun for a few hours, then take back in to cool off. Well, works >>>>> for warped LPs. >>>>> >>>> Got to wait for some global warming first because so far we haven't >>>> gotten our fair share in that department. Last night was another freeze >>>> night, ice in the stairs :-( >>>> >>>> Sun? Yeah, there must be some, somewhere behind the clouds. >>> The East is about to get slammed again. I just heard that I17 is >>> closed south of Flagstaff... impassable. >>> >>> ...Jim Thompson >> >> Between plates, then apply a hair drier? >> > >Or apply the wood stove. It's cranking full bore again, in California, >in February, one neighbor is almost out of firewood by now ... ...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. |