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Re: Cylindrical Slide Rule / tube lengths
From: Wolfgang Hasper
Date: 2010 Jan 31, 11:37 +0100
From: Wolfgang Hasper
Date: 2010 Jan 31, 11:37 +0100
I did some practical archeological research and investigated the (hidden) dimensions of HR/MHR, see attached drawing. (The .dxf can be opened with any CAD software, if you do not have any you can download Q-CAD here for free: http://www.qcad.org/qcad.html) Based on the dimensions found I ordered the tubes so we will not need to care for the lengths later. All those who would like to make a Bygrave, however, can cut the tubes, the Bygrave is shorter. I had an idea on how to make a simple locking mechanism, shown in the upper left part of the drawing. It uses simple materials and can be made with a jigsaw, no special parts needed. It is based on a number of longitudinal cuts in the end of the inner tube, creating a number of segments that can be bent outwards by a disc with circular wedges on its circumference. I will make a sample and see what it is worth. Thank you Gary for your plug details, this is really good to know! Wolfgang Am Samstag, 30. Januar 2010 19:43 schrieb Tom Sult: > I'm in for the whole meal deal! > > Thomas A. Sult, MD > Sent from iPhone > > On Jan 30, 2010, at 1:48, Gary LaPookwrote: > > I priced out the components today. The two inch > > plugs are $3.90, $7.80 for two. The threaded rod > > is $3.59 for 36 inches which I can cut to make > > three pieces long to make three locking devices. > > A self locking nut is $0.45 and a regular nut is > > $0.11. So with sales tax the parts for the locking > > mechanism come to $10.40 plus postage. If anybody > > is interested let me know. > > > > gl > > > > Gary LaPook wrote: > >> If you want to use the locking device that I came > >> up with and you can't buy the components where > >> you are I could purchase them here and ship them > >> to you. The plugs cost about five dollars each, > >> you need two of them, and I think the threaded > >> rod was about the same. I think it would cost > >> about twenty dollars for all the components > >> including postage if anybody is interested. > >> > >> gl > >> > >> Wolfgang Hasper wrote: > >>> I received a sample of those laminated paper > >>> tubes. > >>> > >>> The exterior surface is very smooth and even, > >>> rather matte than glossy. I am sure it can be > >>> used to put on printed scales without further > >>> treatment. > >>> > >>> By the way: I found white adhesive film in A4 > >>> size that can be used in a laser printer. > >>> > >>> the interior surface is glossy, due to > >>> production on a core tube. (it is a coiling > >>> production process. No noticeable seam or other > >>> irregularity from the coil end on the outside > >>> though.) > >>> > >>> For ease of transport and to save on cost there > >>> the tubes should be cut to length at the > >>> manufacturer's. They provide precise cuts to > >>> right-angles which I think is a huge benefit and > >>> valuable help for our futher work. I will > >>> shortly receive information on the cutting cost. > >>> > >>> As I find only now those lengths are not > >>> sufficiently known yet. RvR's paper gives > >>> account of the visible: > >>> > >>> inner tube something > 230mm with 198 mm > >>> of scale intermediate tube 225 mm > >>> outer/cursor tube 222 mm (this is reliably > >>> the true length of the tube) > >>> > >>> The intermediate tube will for sure extend into > >>> the base and end just before the "upper" cursor > >>> cut-out (marked II). (assumed cursor tube on > >>> zero stop) So the inner tube is visible there. > >>> > >>> The inner tube itself will be long enough to be > >>> sufficiently stabilised when fully drawn out, > >>> yet short enough to leave some space for the > >>> locking mechanism down in the base region (when > >>> slide rule is fully closed) > >>> > >>> Assume the black base is a "cup" slipped on the > >>> end of the intermediate tube. > >>> > >>> I will make a sectional drawing to determine the > >>> missing lengths and post it for discussion. Any > >>> comments welcome. Would you please tell me if > >>> anybody wants to have non-HR lengths? > >>> > >>> Wolfgang 999 dxflib 2.0.4.8 0 SECTION 2 HEADER 9 $ACADVER 1 AC1015 9 $HANDSEED 5 FFFF 9 $SPLINESEGS 70 8 9 $DIMEXE 40 1.25 9 $DIMLUNIT 70 2 9 $GRIDMODE 70 1 9 $INSUNITS 70 4 9 $DIMADEC 70 2 9 $DIMASZ 40 2.5 9 $DIMGAP 40 0.625 9 $DIMTXT 40 2.5 9 $GRIDUNIT 10 0.0 20 0.0 9 $DIMEXO 40 5.0 9 $LUPREC 70 2 9 $PINSBASE 10 7.6347438752784171 20 73.7130493979583434 30 0.0 9 $DIMAUNIT 70 0 9 $AUPREC 70 2 9 $PLIMMIN 10 0.0 20 0.0 9 $LUNITS 70 2 9 $PLIMMAX 10 297.0 20 210.0 9 $DIMSTYLE 2 Standard 9 $AUNITS 70 0 0 ENDSEC 0 SECTION 2 TABLES 0 TABLE 2 VPORT 5 8 100 AcDbSymbolTable 70 1 0 VPORT 5 30 100 AcDbSymbolTableRecord 100 AcDbViewportTableRecord 2 *Active 70 0 10 0.0 20 0.0 11 1.0 21 1.0 12 286.3055555555554861 22 148.5 13 0.0 23 0.0 14 10.0 24 10.0 15 10.0 25 10.0 16 0.0 26 0.0 36 1.0 17 0.0 27 0.0 37 0.0 40 297.0 41 1.92798353909465 42 50.0 43 0.0 44 0.0 50 0.0 51 0.0 71 0 72 100 73 1 74 3 75 1 76 1 77 0 78 0 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