Testing surface contact

Posted in: , on 18. Mar. 2008 - 19:13

I’m looking for advise or procedures for testing the surface contact area between a crusher roll and it's journal. I need to achieve 80% or better to prevent slippage

thanks much,

Carl ■

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Re: Testing Surface Contact

Posted on 20. Mar. 2008 - 06:28

I am somewhat familiar with the "blue"

I’m dealing with conical parts

In my mind I pictured this:

Wrap paper around the journal (male part)

Blue the bore on the roll (female part)

Mount the roll on the journal

Remove the roll

Take measurements from the paper to find percentage of contact area

I’m pictureing some sort of graph paper

This is the only way that comes to mind as a repeatable procedure.

Any suggestions?

Thanks,

Carl ■

rickyparkar - Cornerstone, USA
(not verified)

Re: Testing Surface Contact

Posted on 2. Dec. 2008 - 10:23

Hi,

Sorry but i can't understand your question? ■

Re: Testing Surface Contact

Posted on 2. Dec. 2008 - 01:18
Quote Originally Posted by rickyparkarView Post
Hi,

Sorry but i can't understand your question?

It isn't adequately explained is it?

To me it sounds like the roll is fixed on the shaft using tapered bushings: but it wouldn't be the first time I've misunderstood a problem.

If a sheet of paper can be inserted in the gap then there is clearly something wrong with the tapered bush seating under examination? ■

Re: Testing Surface Contact

Posted on 5. Dec. 2008 - 02:15

This sounds like a sleeve bearing journal. I have never heard of the paper method; it somehow does not sound right to me. I am only familiar with blueing the shaft journal prior to correctly installing the parts, adjust bearing clearance to desired gap, rotate the shaft by hand without lubrication and disassemble to observe the contact pattern.

Who was the crusher OEM? ■

Regards, Ralf Weiser (001)-484-718-3518 [url]www.aerzenusa.com[/url]