4261Re: [ModelersCad] A very different way of photo etching
- Oct 24, 2012Mike:I am not sure if it is exactly the same but the process you mean looks as what I've seen being applied by graphic artists to make stamps for getting 3D impressions on paper. They borrowed the method from the process being used by then -early '80s- for making stamps that were those days replacing the old rubber ones.They said, indeed, it was a kind of etching process.They did also show me a way of making a mould for castings by pressing a special stuff, used by dentists to get impressions of our teeth, warmed in hot water upon a pattern.Thank you for reminding me all that. It is certainly a try worth.DanielVan: Mike Bauers <mwbauers55@...>
Aan: Creamcitytraction@yahoogroups.com; ModelersCad@yahoogroups.com; firstname.lastname@example.org
Verzonden: zondag 21 oktober 0:09 2012
Onderwerp: [ModelersCad] A very different way of photo etchingThis is a forward of a casting group post of some days ago and I'll add to it, below.These folks use a product/method where you print a mask from your computer and then photo-develop a two level casting master that can be a master part for sand-casting or a master part for repeated RTV molding/casting.Have a look at the video and see if you agree that the stuff looks to be a low tech way of doing two level casting/molding masters.i suspect it is just that........ A variation of photo-etching in a different material.Mike Bauers*********************Hi Folks
A couple weeks ago, I made this YouTube video to
show one method we use to make a sand casting pattern.
Please excuse the poor capture of my computer screen
that shows the design process.
Your comments are welcome.
Rod****************And below is a follow-up Rod sent to me today... mbprices of the stuff, here...****************
--- In email@example.com, Mike Bauers <mwbauers55@...> wrote:
This is fantastic and new to me.
What is this photo-curing resin Rod used? It seems that that stage of the process can also be used for various model building.
Sent from my iPhone
The material is Ideal iHP photopolymer and is available
from Trodat USA or you can get smaller, more easy to handle
quantities from <http://www.granthams.com/Pattern/>
Photopolymer is commonly available in three durometers or
hardness. The 40 and 50 durometer are soft and flexible
about the hardness of a pencil eraser. It is used primarily
for flexo printing and "rubber" stamps. The 95 durometer is
stiff and hard, about the hardness of a car tire.
My main occupation was a printer and these materials were
a quicker and safer than zinc and magnesium photoengravings
and a good substitute for many printing operations. These
are what I made and used until about 30 years ago when
photopolymers came on the scene.
Hope this wasn't too long winded an answer.
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