How to unstick center disk of round slide rule?
in [Design]
|
From: Michael A. Terrell on 23 Feb 2010 18:29 Joerg wrote: > > Jim Thompson wrote: > > On Tue, 23 Feb 2010 07:02:32 -0800, Joerg <invalid(a)invalid.invalid> > > wrote: > > > >> Lil Red Riding In The Hood wrote: > >>> On Mon, 22 Feb 2010 18:08:09 -0800, Joerg <invalid(a)invalid.invalid> > >>> wrote: > >>> > >>>> Lil Red Riding In The Hood wrote: > >>>>> On Mon, 22 Feb 2010 16:35:15 -0800, Joerg <invalid(a)invalid.invalid> > >>>>> wrote: > >>>>> > >>>>>> Maybe I can get a thin layer of PTFE somewhere. > >>>>> A piece of grocery bag or two. Maybe half a mil each layer. > >>>> Poly bags? We use those for when our Rottweiler let's one go during our > >>>> walks :-) > >>>> > >>>> But I'll try. > >>> > >>> > >>> Not the "glassine bag" type, but the type that resists tearing. > >> > >> All the ones around here tear. They are also extremely thin and may soon > >> be taxed out of many CA stores. > > > > Gunk Silicone Spray Lubricant > > > > Spray onto a paper towel, then apply to where you need it... VERY > > slippery... MIST falling onto a tile floor may be hazardous to your > > health ;-) > > > > ... or as you mentioned in another post ... slip ... *SPLAT* :-) I thought that *SPLAT* noise was reserved for heavy duty diarrhea? -- Greed is the root of all eBay.
From: Joerg on 23 Feb 2010 18:37 Michael A. Terrell wrote: > Joerg wrote: >> Jim Thompson wrote: >>> On Tue, 23 Feb 2010 07:02:32 -0800, Joerg <invalid(a)invalid.invalid> >>> wrote: >>> >>>> Lil Red Riding In The Hood wrote: >>>>> On Mon, 22 Feb 2010 18:08:09 -0800, Joerg <invalid(a)invalid.invalid> >>>>> wrote: >>>>> >>>>>> Lil Red Riding In The Hood wrote: >>>>>>> On Mon, 22 Feb 2010 16:35:15 -0800, Joerg <invalid(a)invalid.invalid> >>>>>>> wrote: >>>>>>> >>>>>>>> Maybe I can get a thin layer of PTFE somewhere. >>>>>>> A piece of grocery bag or two. Maybe half a mil each layer. >>>>>> Poly bags? We use those for when our Rottweiler let's one go during our >>>>>> walks :-) >>>>>> >>>>>> But I'll try. >>>>> >>>>> Not the "glassine bag" type, but the type that resists tearing. >>>> All the ones around here tear. They are also extremely thin and may soon >>>> be taxed out of many CA stores. >>> Gunk Silicone Spray Lubricant >>> >>> Spray onto a paper towel, then apply to where you need it... VERY >>> slippery... MIST falling onto a tile floor may be hazardous to your >>> health ;-) >>> >> ... or as you mentioned in another post ... slip ... *SPLAT* :-) > > > I thought that *SPLAT* noise was reserved for heavy duty diarrhea? > :-) Ok ... phssswit ... *THUD* -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: JosephKK on 23 Feb 2010 21:51 On Sun, 21 Feb 2010 13:48:04 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Phil Hobbs 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. >> > >My wife would read me the riot act if I came back from a biz trip and >there's faint black stains on all the shirts :-) Try finding a BN lubricant, it is, fortunately, white and otherwise acts a lot like graphite. May be a bit spendy though. Or maybe powdered soapstone.
From: JosephKK on 23 Feb 2010 21:57 On Mon, 22 Feb 2010 13:21:01 -0800, Joerg <invalid(a)invalid.invalid> wrote: >JosephKK wrote: >> 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. >> >> Photos, Photos, Photos. Oh and some dimensional measurements might be nice. > > >http://www.analogconsultants.com/ng/images/sliderule1.JPG > >The center wheel that goes into the aluminum area is 2-3/8" in diameter, >the whole thing is 3-1/4". There is some useful dimensional things going on there that are not showing up in that photo. Could you tip them to about 75 degrees and take another shot? Could you measure the dimensions of all the brass pieces and the thickness' of the disk parts?
From: JosephKK on 23 Feb 2010 22:11
On Mon, 22 Feb 2010 13:39:18 -0800, Joerg <invalid(a)invalid.invalid> wrote: >MK wrote: >> "Joerg" <invalid(a)invalid.invalid> wrote in message >> news:7u8t7eFgi2U1(a)mid.individual.net... >>> 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. >>> >> >> Buy a calculator - been around more than 30 years now - some of them pretty >> good. >> >> Mine's an HP32S which works in RPN so has enough obscurity factor to put off >> casual borrowers ! >> > >Got that, a HP11C. However, when calculating part value ratios a slide >rule is more practical because you typically only have 6 or 12 values >per decade if you must use catalog inductors. Which I nearly always have >to. Sometimes even down to 3-4 values because of notorious no-stock >situations. So you de-focus your eyes a bit, squint, and then scoot the >slide rule until a combination of values gets close enough. With a >calculator you'd be typing on blisters pretty soon. To a certain extent that depends on how you use it. |