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Tucson Don
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Join Date: Apr 2008
Location: Somewhere near BF, Arizona. ...seriously! ...we're that close.
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Epoxy Shimming Procedure

07/09/2010 7:02 PM

Hello my fellow CR4'ers.

Do any of you have experience with an epoxy shimming process?

We're working with some large weldments we'd rather not post machine. We thought we could possibly make a smaller sub-frame (also welded, but post machinable) to fit inside the larger weldment, and then use a master tooling jig to hold the sub-frame and modules together and inject epoxy (waxed contact surfaces for dis-assembly) into the gap to eliminate any tolerance stacking.

Does this sound like anything any of you have done or read about? I'm looking for details.

Many thanks!

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ronseto
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#1

Re: Epoxy Shimming Procedure

07/09/2010 7:18 PM

You are referring to a product called "chock fast" made by Philadelphia resins corp. It is an epoxy resin product used throughout the shipbuilding industry as an interface between a machine and it's foundation. Machines weighing several hundred tons are accommodated with this material. It uses a release agent so the components can be separated later.

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redfred
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#2
In reply to #1

Re: Epoxy Shimming Procedure

07/09/2010 9:37 PM

Bravo Ronseto, a very Good Answer.

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kramarat
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#3
In reply to #1

Re: Epoxy Shimming Procedure

07/10/2010 12:06 AM

GA, That's what I love about this site. I can be completely clueless about a post, but when I open it up, I learn something new every time!

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lyn
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#4
In reply to #3

Re: Epoxy Shimming Procedure

07/10/2010 5:12 AM

I'm completely clueless about most posts!
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Humble Ess
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Join Date: Oct 2007
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#5

Re: Epoxy Shimming Procedure

07/12/2010 3:16 AM

Hi Tucson, you can use `Chocfast Orange' or `Epocast 36' two component pourable epoxy compounds. But I think, the minimum thickness of shim / chock should be about 10 mm or 1/2" and you have to check the load bearing capacity of these chocks using the calculation procedure given by the manufacturer. These compounds are used in place of thick steel chocks and can not be used to replace thin metal shims.
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Tucson Don
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Join Date: Apr 2008
Location: Somewhere near BF, Arizona. ...seriously! ...we're that close.
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#6

Re: Epoxy Shimming Procedure

07/12/2010 10:45 AM

Thanks to everyone for their input, I'll check into the materials recommended.

Hopefully we won't have to use 1/2" (10-12 mm) of the material, or this solution will be DOA. We're working on the master jig design starting in a couple weeks, so we'll get ourselves familiar with the products in the interim.

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Humble Ess (1); kramarat (1); lyn (1); redfred (1); ronseto (1); Tucson Don (1)

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