Re: [CAD_CAM_EDM_DRO] Re: Hot rolled router frame: added note

Hi guys;

I'm sure the mold makers of the list can add detail here, so I'll just mention
a couple basic points. Depending on a number of factors, including what kind of
mold/fill material is bring used, the fill material can form a small concave or
convex shape at the rim of the mold. Temperature is a notorious cause of this
as the surface area begins to set first, and then the center of the fill
material cools, causing shrinkage, pulling some of the surface down into the
mold, or at least in that direction. An obvious solution is to make the mold a
little large, or overfill it a smidge, and then machine off the excess, but for
the idea you express below, this could, in some cases at least, be self
defeating.

Bill

On Wed Mar 5 05:33:03 2003 Leslie M. Watts wrote:
>
>Hi Peja
>
>I remember in school we experimented with large
>telescope type mirrors created from a huge shallow
>pan of mercury slowly spinning. The surface was
>very accurate. (we had protection from vapor of course)
>
>I think most epoxies and polyester/styrene resins
>are too viscous to flow out well, but I know some very
>low viscosity specialty resins can be had.
>
>You might wish to try an experiment with a small amount, measure the
>flatness, and tell us how it did!
>
>Les
>Leslie M. Watts
>L M Watts Furniture
>Tiger, Georgia USA
>http://www.alltel.net/~leswatts/wattsfurniturewp.html
>Engineering page:
>http://www.alltel.net/~leswatts/shop.html
>Surplus CNC for sale:
>http://www.alltel.net/~leswatts/forsale.html
>----- Original Message -----
>From: Miroslav Pejic <peja@...>
>To: <cad_cam_edm_dro@yahoogroups.com>
>Sent: Wednesday, March 05, 2003 7:24 AM
>Subject: FW: [CAD_CAM_EDM_DRO] Re: Hot rolled router frame: added note
>
>
>> REPEATED MESSAGE FOR CLARITY
>>
>>
>> Hi, Les
>>
>> Reading your text I get one idea:
>> Suppose we put two strips on both side of 4"x6"x1/4" hot rolled steel,
>> getting picture like this:
>> resin
>> / strip
>> / /
>> !...........!/
>> !!---------!! Then we can level the tube horizontally and put epoxy resin
>> !! !! or polyester
>> !! !! to get two millimeter (for example) layer. This layer will
>> ! ! be ideally
>> ! ! horizontal before resin get hard.
>
>
>
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