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German symbols

dr_gallup

Moderator
I got a scanned copy of an old (1966) German tooling drawing. It has some symbols I don't understand. I think it has something to do with how the surfaces are produced, Cut, rough ground, finish ground, etc but that is just a guess. I hope this jpeg which is a conversion of the original tiff is legible. The symbols are a tilde (~) and 1 to 4 inverted triangles. If anyone can translate the text I will be grateful.
View attachment 759
 

cristelino

New member
If is a very old drawing the things can be different


The german language have A LOT of composite words


Imagine you need to rough a surface in finest class possible and the word can


be in english "FINESTROUGHSURFACE"


The german talk in this manner


Don"t forget if is the old drawing must think what where the condition to machinning designed parts in that time.........


In my opinion in your image is abbout quality of surface


For example GlatteFlache can be glatty surface


Flache mind surface or flat


Can you show me all drawing?


Cristelino
 
hi


you are right - it has sth to do with surface finishing.


glatte flache - surface which is smoothed out


schruppflache - rough surface


schlichtflache - it is a surface which is a litlle bit smoothed out


feinschlichtflache - very smooth surface


feinmessflache - the smoother surface of all mentioned above
 

cristelino

New member
Good tip Ankarl







But i am afraid translation is not very thecnical ;thats
mind is not very good but i try for others phrases,normal,
an is working 80 % corect



Cristelino

 

robertib

Member
The triangles are the surface finish requirements - the information below is based on a surface roughness standards comparator we have here.


1 triangle is 12.5Ra


2 triangles are 6.3 to 1.6Ra


3 triangles are 0.8 to 0.2Ra


4 trangles are 0.1 & 0.05Ra


Hope this helps - I don't know what the tilde means.
 

francoalberto

New member
Hello dr_gallup





general condition meaning of the


~ symbol means -even, smooth, surface without finish instruction-


defined surface quality (roughness) manufactured by hand or milling/lathing machine


v rough machining between 1mm and 3mm cut off to prepare for next step (hand =rasp, milling=roughing out operation)


v v smoothing with cut off 1mm to 0.5mm fine surface (hand=fine file, milling=finish)


v v v smoothing with cut off 0.5mm to 0.09mm fine finishing surface


v v v v smoothing with cut off 0.09mm to 0.01mm precision measuring surface


grinding and honing are not part of this production process.


regards


Franco
 

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