Hardness test using a hand grinder
Hardness test using a hand grinder
(OP)
I read this from: http://www.marineengineering.org.uk/Default.htm
under the heading of repair and main engine
"hardness testing of the journal indicated results far in excess of maximums. Spot grinding using a hand grinder to 1.6mm indicated that hardness was still unacceptably high. As this was approaching maximum allowable decision taken to replace crankshaft"
I wish to know how to do a hardness test with hand grinder.
under the heading of repair and main engine
"hardness testing of the journal indicated results far in excess of maximums. Spot grinding using a hand grinder to 1.6mm indicated that hardness was still unacceptably high. As this was approaching maximum allowable decision taken to replace crankshaft"
I wish to know how to do a hardness test with hand grinder.





RE: Hardness test using a hand grinder
If I am wrong, someone kindly explain the hand grinder hardness check!
RE: Hardness test using a hand grinder
You might as well use the "metal file test" instead of thje hand grinder; take a standard metal file, which is hardened, and file the edge of the sample to see if it is as hard or softer than the file.
RE: Hardness test using a hand grinder
RE: Hardness test using a hand grinder
Certianly not an approved method of determining the hardness of a steel crankshaft, but it does illustrate how common tools can be used to evaluate the metallurgical condition of a damaged component. I certianly would not ues this method to qualify a material for use, but would have no problem using it to reject suspect material (as was done here).
RE: Hardness test using a hand grinder
I have several sets of these files. I seen some people that were good with a grinder in determining whether a part was hardened or not.
It wasn’t too long ago that I was in a local fab shop when a older fitter while prepping some flat bar by grinding called attention to some CR CS that was to hard. It turned out the material was heat treated 4140 that had been marked wrong by the service center. I spark tested all the material for them and separated the 4140.
http:
RE: Hardness test using a hand grinder
RE: Hardness test using a hand grinder
grinder test is good to confirm (to certain extent) the carburised depth, the rule of thumb is, the higher the carbon content, the more spark is seen,
high carbon steel will exhibit "x" shape spark as compare to mostly single line spark on low carbon steel.
Best regards,
ct
RE: Hardness test using a hand grinder
RE: Hardness test using a hand grinder
WHere it is suspected that this will be some depth spot grinding either using a small air driven pencil grinder, or in extreme cases ( as was the fact with this failure) by light application of a hand held grinder.
RE: Hardness test using a hand grinder
RE: Hardness test using a hand grinder
RE: Hardness test using a hand grinder
The use of a hand grinder was only to remove material to find out how much material would have to be machined before hardness reduced to acceptable methods.
The hand grinder was not used in any way to detect hardness