Re: [casting] Re: Large Casting... REALLY large castings...
As I recall the domes were 14 inches across or there abouts. The models
included working thrusters and ballast. We would make waves in the tank
and then attempt to hook up the model to a free swinging model hoist.
The idea was to see what the maxium sea state was that the Sea-Link
could be recovered. We found that it did not take much in the way of
waves to make auto hooking all but impossible, if you ever watch one of
them sea life TV programs where there is any type of research sub, they
always have a guy dive in to the water to hook up the
sub......................................and now you know why.
Casting Fool wrote:
>From: "Ichthyosapien" <immerse@...>[Non-text portions of this message have been removed]
>>We tested the "Sea-Link" subs that the resin domes were cast for. The
>domes were heat cured for over a month to get a perfect bubble free cast.
>Our part was testing models in our ship towing tank testing for extraction
>stability. This was many years ago at UC Berkeley.
>Now that's cool. What scale were the models (dome diameter)?
- On Sat, 10 Jan 2004 17:09:12 -0800 (PST) Ted Quick <rim_molder@...>
> Yes, they do make blister windows for vans that way. If they ned aThanks for the confirmation on this and the additional details Ted!
> bigger one
> they tend to put a box around below the holding panel and pull a
> vacuum in it
> while utting compressed air above it. Makes it move a bit faster.
> Just be sure
> to seal between the bx(es) and the holding panel with something like
> vacuum grease or petroleumm jelly, or leaks will frustrate your
> Ted Quick
Sure saves a lot of time on making a quality plug and/or negative mold.
It probably also prevents unwanted marks on the finished acrylic piece,
since the bubble being formed isn't touching anything.