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Measuring surface finish in difficult to reach places?

KristianSilva

Aluminum
Joined
Nov 26, 2016
Hello!

How do you guys approach measuring surface finish in difficult to reach places, like in confined spaced inside a mold etc?

We have to measure the surface finish inside the buckets of a pelton runner...

Machined Runner.jpg

We have a surface finish gauge similar to this one:

Mitutoyo, Category: Surftest SJ-410

However the head is rather large and cumbersome and we wont be able to get it inside the buckets to measure the free form surface.

So the question is, how would you measure the surface finish between the buckets? Are there other surface finish gauge available with a smaller head?

Open to suggestions
 








 
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