Technical, Techniques, Hints, and Tips > Modelling tools

Measuring engine components

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richardwilde901:
Hello, I am working with a client and long story short we we are looking to measure engine parts and more specifically things like propeller shaft.


I use this standard caliper and passionately stand by it.


What are people using? Are there cheaper alternatives that offer good protection again dust and water?

Shipmate60:
It will depend on power source, propeller size and type of boat.


Bob

SteamboatPhil:
Also what  are you trying to do, do you have the engine ? Hull design etc BTW its a vernier gauge not a calliper  :-))

derekwarner:
BTW its a vernier gauge >>:-( ......well no.....there is no vernier graduation comparison function...


So it really is a digital [measuring] caliper [or a 6" adjustable spanner] {-)


The published accuracy of +/- 0.001" is acceptable, an experienced machinist well may be able to distinguish by feel with a micrometer down to 0.0005"


It is the repeatability of the digital caliper that is useful here.....a 1" reamer shank could display as 1.000", and a 1" shaft of precision ground steel may measure as 0.999"...measure each item 10 times and you will get the same repeatable dimension on each occasion


My  6 months old  $25.00 Chinese digital caliper  absolutely mirrors the dimension measured with my 60 year old $25.00 Polish vernier caliper


$25.00 some 60 years ago was about one weeks wage]........


Either a  vernier caliper or a digital caliper would be 9/10's of useless if singularity used to measure a model engine bore  {-)


Derek

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