Ray, that's another thing I never considered. Do you possibly know how the isocyanates affect the oil, or the pump itself? My chemistry knowledge is way too...
36025
Ray K
kleenax
Oct 1, 2012 1:31 pm
I was always under the impression that you can't pull a good enough volume or vacuum with a diaphragm pump. Don't really know, but that's what John told me...
36026
Ted Quick
rim_molder
Oct 1, 2012 2:09 pm
I don't quite see how Isocyanates could collect in the vacuum pump, since that's the main reactive component in ANY urethane, and it will always react with any...
36027
mark treutelaar
emberridge
Oct 1, 2012 10:33 pm
The pieces are coming out quite well . We will have to do a small amount of sanding on the inside. We made 2 boxes so far. We have anotherfinished  mold we...
36028
Jack
freshwatermo...
Oct 2, 2012 1:15 pm
In thinking about the Composi-mold material I was thinking about soft plastic items that can be melted to use for a mold. I came up with worms! No, not...
36029
Ken Burney
ken_the_guy_...
Oct 2, 2012 2:10 pm
That would be one soft mold. Ken the guy from AR Sent from my iPhone ... [Non-text portions of this message have been removed]...
36030
Ted Quick
rim_molder
Oct 2, 2012 3:05 pm
Main problem with that is that they likely melt a LOT higher than the 135(? or was it 140) degrees that Composi-Mold melts at. They will probably melt at 250...
36031
Ray K
kleenax
Oct 2, 2012 3:15 pm
Be easier just to buy some of the stuff from Alumilite if you are bent on trying it. They have all of the soft (remelt-able) plastic "worm material" that you ...
36032
Rob de Bie
rob_de_bie
Oct 2, 2012 7:52 pm
Ray, I used a Vacuubrand pump in a lab long time ago. So I checked out the Vacuubrand website, and they categorize their pumps as 'down to 70 mbar', 'down to 7...
36033
Rob de Bie
rob_de_bie
Oct 2, 2012 7:52 pm
Ted, thanks for the chemistry lesson! Resin casting just got a bit more complicated for me :-) I will keep an eye on the oil. Rob...
36034
maluzern
Oct 3, 2012 10:37 pm
Plastic fishing worms are made from a PVC plastisol. The melting point is approximately 350 degrees. As a thermoplastic PVC can be remelted, poured into a...
36035
Ray K
kleenax
Oct 3, 2012 11:04 pm
At the beginning of this thread, I mentioned that Alumilite.com has this material (called Alumisol), along with some various additives to cast your own...
36036
Ted Quick
rim_molder
Oct 3, 2012 11:20 pm
OK, but Alumisol melts at 350F, which brings complexities of it's own. Also warns that it shouldn't be heated ABOVE that temp for safety, and how can you...
36037
Jack
freshwatermo...
Oct 4, 2012 11:44 am
Oh well, I guess I'll just have to stick with the RTV I've been using for about 20 yrs....
36038
q
etfrench
Oct 4, 2012 4:11 pm
What is the difference between Polyurethane and Urethane casting resins? The terms seem to be interchangeable, but are they?...
36039
myjakjs
Oct 4, 2012 4:11 pm
I use a liquid plastic from Barlows Tackle. See my article here. http://www.kitforums.com/viewtopic.php?f=6&t=7258 John...
36040
Jack
freshwatermo...
Oct 4, 2012 7:38 pm
... Good question! From what I can find out using Google "urethane"; is just short for polyurethane as regards to resin. I just call it casting resin or...
36041
Ted Quick
rim_molder
Oct 4, 2012 10:06 pm
Very true. In the plastics industry "Poly" means "many", so polyurethane means many urethanes. Think of it this way, when you mix up your polyurethane and it...
36042
doc
torobots
Oct 5, 2012 12:54 am
... I've mentioned a few times on this list about using pure silicone caulking and mixing it with glycerine to aid the cure when it is enclosed. As I remember...
36043
Bruce .
bakmthiscl
Oct 5, 2012 1:40 am
Actually, this is a little bit backwards. "Polyurethane" means a polymer of urethane (clear, no?). The "plastic" is polyurethane. The monomer is urethane....
36044
ihscoutfan@...
thedtandiguy
Oct 7, 2012 8:08 pm
is there a supplier where i can buy lego's in bulk and the same size? thanks! randall [Non-text portions of this message have been removed]...
36045
Lane Shutt
a52873
Oct 7, 2012 8:29 pm
... Lego store or ebay. The online Lego store lets you order individual bricks. http://shop.lego.com/en-US/Pick-A-Brick-11998 The standard 2x4 block is $.30...
36046
Ken Burney
ken_the_guy_...
Oct 7, 2012 8:36 pm
You can get them at the Lego web site in bulk same size and color. I have found it is cheaper to just buy Mega Blocks in the big tub. Just get rid of the...
36047
Charles Anderson
charlesian2000
Oct 8, 2012 2:29 am
... Brick Link :-)...
36048
Bruce .
bakmthiscl
Oct 8, 2012 11:41 am
I'm curious -- why do you need legos in bulk? ... -- Bruce NJ...
36049
Ken Burney
ken_the_guy_...
Oct 8, 2012 1:52 pm
I don’t know about the poster but I use them for making mold boxes. They work great for what I do. All My mold boxes are about ¾ of an inch think and...
36050
etfrench
Oct 8, 2012 3:15 pm
Thanks for the replies. A hobby store I was in the other day couldn't tell me if their polyurethane resin was equivalent to urethane so I was reluctant to...
36051
dumbkoff36
Oct 8, 2012 3:15 pm
I ran across this little article from a steampunk website and had to tell everyone. This is the coolest idea for a casting I have seen in a while. You can cast...
36052
Harold
hairold...
Oct 8, 2012 3:16 pm
________________________________ From: Ken Burney <wkburney@...> To: casting@yahoogroups.com Sent: Monday, October 8, 2012 6:52 AM Subject: RE:...
36053
Stephen
ssculptor
Oct 8, 2012 4:20 pm
A couple of thoughts come to mind. 1) I have all the Legos I need for mold boxes by visiting rummage sales and charity resale shops. When I find them at these...
