Jim Fainges draftsman - ZelmerOz.com1 By Jim Fainges Jim Fainges draftsman • Adapted from a...

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By Jim By Jim FaingesFainges

Jim Fainges draftsman

• Adapted from a Modelling the Railways ofQueensland Convention presentation[Lynn Zelmer, Editor & CaneSIG Coordinator]

• Many of Jim's drawings available online fromthe CaneSIG web site:http://www.zelmeroz.com/CaneSIG

Jim Fainges: Scale Drawings from Photographs

www.zelmeroz.com/CaneSIG © 2007-2011

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Photogrammetry

• It's a technique for developing reasonabledrawings when no others exist

• Caution: dimensions, when given, may be'slippery' as usually only one or two criticaldimensions are known, and even those mayhave been estimated (eg scaled from distancebetween rails) or hard to scale (eg wheeldiameter)

Commonwealth Handbook

• Handbook ofHeritage Photo-grammetry: atechnical resourcefor heritageprofessionals



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Formula

• Full of facts andcomplicatedformula essentialto producedrawings fromphotos

• Bull!!!

Stage 1• Have desired

photographenlarged

• Mount on adrawingboard

• Align theverticals

• Cover withtracing paper



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Stage 2• Draw boxes

using edges• Draw

diagonals

Stage 3• Draw

verticals andhorizontals

• Then morediagonals

• Continueverticals andhorizontals



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Stage 4

• And more ofthe same

• Note not allspaces needfilling

Stage 5

• Keep on tillareas aredivided intoeven spaces

• Then removediagonals



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Stage 6• Draw in

details• Remove

tracing fromphoto

• Leavingdrawing ongrid

Stage 8

• Layoutgrid toscale

• Plot in thedrawing

• Removegrid



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Stage 9• Transfer to

plan• NOTE the

plan of thePerryexisted onlycab tanksand stackwerechanged

Simple geometry 1

• Finding thecenter of a line

• Scribe two arcslonger thanhalfway andconnect points



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Simple Geometry 2• Dividing a line

into equal parts• Draw a line at an

angle to linedivide intonumber needed

• Connect end oflines and drawrest parallel

Drawing from non parallel shape• Photos taken

from low anglesdistort

• These can becorrected



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Odd shapes 1Mount as beforeFix outline and divide intohalvesDraw diagonalsNote the center ofdiagonals is not the centerof outside divisionDraw lines parallel withouter divisions

Odd Shapes 2• Continue

diagonals anddraw connectinglines at theirintersections



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Odd Shapes 3• The process

continues wheredetail is required

• Note any knowndimensions

Odd Shapes 4

• Subdividewhere moredetail isrequired



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Odd shapes 5• Proceed as

before inmaking grid toknowndimensions andproceed to plotdrawing

Some Tools of the Trade 1• SCALE RULE• Made from 6 mm ply to

dimensions shown• Paint scale BLACK on

one side and RED on theother

• NOTICE the dimensionsare in IMPERIAL

• But a scale can be madein METRIC if required



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Scale rule 2• Join

sectionswith boltsand nutswith awasherbetweeneach part

More Tools of the Trade

• INCLINOMETER• Used to measure

heights• Cut parts as shown• Scale can be

photocopied• Construction is as

shown



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Inclinometer in use 1• Sight on an

object or featureand record angleProceed asindicatedIt is a good ideato know how highyour eyes arefrom the ground

Inclinometer 2

• Height ofobject canbe obtainedby diagramorcalculation



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St Mathews Grovely

• Here I usedtheinclinometerfor height ofgables andeaves alsothe height ofbell tower

Using the scale rule

• Here therule isindicatingthe heightof fasciaand gutteron vestry



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Sample Plan• Side

elevationof StMatthewsoriginal isdrawn at1:87

Computer-Aided

• Jim's photogrammetry drawing techniques canalso be used with computer-based drawing tools

• Photoshop's 'layers', for example, can take theplace of tracing paper. Diagonals can be drawnon a separate layer, or in a unique colour,making it easy to delete them at Stages 5-6.Similar techniques can work with many photoor drawing tools. [Lynn Zelmer, Editor & CaneSIG Coordinator]



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