Lister 5/1 Diesel

Engineering Tables

Identifying Metals by Grinding Wheel Sparks

Characteristics of Sparks Generated by the grinding of Metals

Metal Volume of
Stream
Relative Length
of Stream in Inches*
Colour of Stream
Close to the Wheel
Colour of Sparks
Near end of Stream
Quantity of
'Spurts'
Nature of
'Spurts'
Wrought Iron Large 65" Straw White Very Few Forked
Machine Steel Large 70" White White Few Fine, Repeating
Carbon Tool
Steel
Moderately
Large
55" White White Very Many Fine, Repeating
Grey Cast Iron Small 25" Red Straw Many Fine, Repeating
White Cast Iron Very Small 20" Red Straw Few Fine, Repeating
Annealed
Malleable Iron
Moderate 30" Red Straw Many Fine, Repeating
High Speed Steel Small 60" Red Straw Extremely
Few
Forked
Manganese
Steel
Moderately
Large
45" White White Many Fine, Repeating
Stainless Steel Moderate 50" Straw White Moderate Forked
Tungsten-Chromium
Die Steel
Small 35" Red Straw** Many Fine, Repeating**
Nitrided
Nitralloy
Large (Curved) 55" White White Moderate Forked
Stellite Very Small 10 Orange Orange None ----
Cemented Tungsten
-Carbide
Extremely
Small
2" Light Orange Light Orange None ----
Nickel Very Small*** 10" Orange Orange None ----
Copper
Brass
Aluminium
---- ---- ---- ---- ---- ----
* Measured with a 12" grinding wheel
** Blue-White Spurts
*** Some Wavy Streaks


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