Parallelism of rock core

[greencapsicum]

Hi guys,

I work in a geotechnical laboratory in Australia and our standards require that core we test is parallel to 0.05mm/50mm. Part of the problem we're facing is that the core delivered to us is often quite rough and therefore difficult to measure.

Either way, I'm wondering if anyone has any suggestions about how to measure the parallelism of the core or any relatively affordable apparatus that can achieve this. Ideally, I'd like to measure parallelism and flatness at the same time!

Appreciate any help.

Regards

 

[powerhound]

In my mind, a core is cylindrical which means flatness is out of the question. What do you mean by parallel? Do you mean that the diameter cannot vary more than .05mm over a 50mm length?

John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II

 

[MintJulep]

Parallel requires two surfaces.

What surfaces are your interested in?

At any rate, I'm thinking surface plate and feeler gauge.

 

[drawoh]

greencapsicum,

When we work to ASME Y14.5, which very likely does not apply to you, a parallelism specification indicates the maximum indicator movement with respect to a datum. In the absence of other specification, a parallelism specification controls the surface finish. Usually, there is a surface finish called up on a drawing which is very much better than what the parallelism specification will allow.

If you are not working to ASME Y14.5 or some other similar standard, then there is nothing to base your specification on.

--
JHG