stanhas87
87thScale addict
1978 Dodge Monaco CHP
Posts: 4,906
|
Post by stanhas87 on Dec 24, 2006 16:41:35 GMT 1
One i would like to see made is the matchbox 2000 chevy impalia police car. Dear All: Welly's version is by far better.
|
|
MSteele
Junior Member
On Youtube now!
Posts: 241
|
Post by MSteele on Dec 24, 2006 20:22:14 GMT 1
One i would like to see made is the matchbox 2000 chevy impalia police car. Dear All: Welly's version is by far better. Yeah i have to agree.
|
|
Lee
Senior Member
Posts: 1,899
|
Post by Lee on Dec 25, 2006 18:10:43 GMT 1
This Hydroshrink is something else. The instructions say to mix one part Hydroshrink to four parts ice cold water. The result after a minute or two is like jello. No strength to it and it wants to stick to everything. Doing the bumpers and headlights on older models is going to be a real challenge, to say the least. Lots of air bubbles even after working with the pour. Joe, how are you getting rid of the air bubbles?
|
|
|
Post by superba on Dec 25, 2006 18:58:13 GMT 1
Lee:
I have had some minor issues with air bubbling, but not enough to discourage me. I have been pouring slowly and also making sure all the details in the molds are open to ensure good flow of Hydroshrink. I have been mixing for about 30 seconds, then allowing 30 seconds to pour. I know thats very little time to work with, but I have gotten more relaxed at it lately.
Your right it is like Jello when removed from the mold....over several days as the water evaporates the hydroshrink cures to a rubber like feel.
I have had air bubble appear in pillars and some small bubbles in the grille work. What I have found is that the bigger the scale you work with the less the impact on the resulting shrunk casting.
I'll fix the issues when I work on the final resin master. The 54 Checker Hydroshrink casting lost horizontal grille detail in casting, but the radiator detail behind is perfect. I will use strip plastic to fix the grille on the resin master.
If a casting has too many bubbles, I'll do over again. It's been more luck than anything else, some casting have no bubble other seem to have moderate levels.
In terms of my experimenting on the 61 Ford Town Coupe it is a total failure, the Blue RTV had a chemical reaction with the Alllumilite Latex mold.
For now on I will just work with Allumilite resin and mold material and Hydrowshrink.
Made a mold of the Johan 1//25 Rambler American last night. Will do a Hydorshrink casting, once the Christmas partying at the Fay family household wraps up. I am currently dealing with two 20 month olds running around my house.
|
|
MSteele
Junior Member
On Youtube now!
Posts: 241
|
Post by MSteele on Dec 26, 2006 5:33:05 GMT 1
cannot wait to see pics of the finished molds
|
|
|
Post by superba on Dec 26, 2006 15:41:22 GMT 1
Made rough castings of most of the cars discussed above yesterday. Made a 1/25 mold of a 61 Rambler American on Sunday, cast in Hydroshrink yesterday. Lee, no bubbles at all.
The Rambler will have to cure today. Dropping friends off at O'Hare airport today, will stop by the Des Plains Hobby to order more Allumilite mold making material.
My camera is shot, but I will take some rough pictures of the castings right now with my wifes camera and post later in the day.
Will make molds for the following today
1957 Dinky Hudson Hornet 1962 Chevy Belair Johnny Lightning 1963 Ford Galaxie Johnny Lightning 1964 Ford Country Squire Morotrific........redue from first failure 1963 Rambler Classic..............................redue first casting more like 1/76 1961 Ford Econoline Hot Wheels.
Sould have enough mold material will cut up some older molds.
|
|
|
Post by DavidJohnson on Dec 26, 2006 19:21:38 GMT 1
Joe, This is exciting. Many of the cars you are casting are high on my list of desired models. Especially the Ramblers.
Dave
|
|
|
Post by superba on Dec 26, 2006 20:02:17 GMT 1
Front Row 61 Ford Fairlane, 56 Rambler Wagon, 65 Chevy Impala, 61 Olds Super 88 Holiday, 60 Lincoln Back Row 62 Pontiac, 64 Dodge 330, 64 Studebaker Wagonaire, 64 Ford Fairlane all but the Olds are the first raw solid casting. Hydroshrink amazing shrinking castings 85 Gran Fury, about 1/45 started at 1/25, in backround is the 1/25 61 Rambler 24 hours after casting its already starting to warp. 60 Ford Wagon and 67 Plymouth four door ready for casting in 1/87. Checker DeSotos and Falcon need about another week or two to get to 1/87. Notice how the Checker, DeSoto and Falcon have amber outer edges but are still white in the center. Eventually the white casting turns clear amber.
|
|
Lee
Senior Member
Posts: 1,899
|
Post by Lee on Dec 26, 2006 23:51:35 GMT 1
I am impressed! Looks like you have your work cut out for you for the rest of the winter.
|
|
|
Post by superba on Dec 27, 2006 3:35:26 GMT 1
Lee, in all honesty this process so far has not required much time from a craftmens point of view. I feel more like a chemist.
I have another ten or so projects in similar status. Todate, total time invested is about six hours. The most time so far is about one hour to hollow out the Olds and the 60 Rambler wagon.
The key is to create a pipeline of projects running in various states. I think I can get all my project done by spring time. Total about twentyfive masters.
Next up:
1960 Oldsmoblie 1959 Pontiac 1959 Oldsmobile 1962 Dodge Dart 1960 Ford Fairlane four door 1961 Ford Galaxie 2 door hardtop 1962 Dodge 330 1962 Studebaker Lark 1958 Imperial 1960 Chevy Impala 1960 Mercury Monterey Wagon
All will be 1/25 reductions, timeline to complete is over the next eight weeks.
Additionally from 1/64 scale
1959 Ford F150 1961 Ford Econoline 1965 Pontiac 1965 Buick Wiidcat 1962 Chevy Impala 1963 Ford Galaxie 1963 Plymouth Savoy two door
All masters have been or will be started this week and could be completed in the next three weeks.
From 1/43
1961 Pontiac Superior Ambulance 1963 Rambler Classic 1963 Mercury Maurader 1964 Mercury Maurader 1963 Lincoln 1958 Pontiac
Then I am done. I can sell some and make some finished models for myself.
I will need to finish the vehicles depicted in the photo above soon, so I can start selling and fund the other projects.
|
|
Lee
Senior Member
Posts: 1,899
|
Post by Lee on Dec 27, 2006 4:29:48 GMT 1
The list you are showing would take two to three years to make the masters the conventional way. You will have them all done in one year. Here is what I have been playing with while Jerry is unavailable. These have been cast in 1/87 molds and are reducing down to N gauge size.
|
|
|
Post by superba on Dec 27, 2006 17:35:04 GMT 1
Lee:
N scale, now I understand you issues with air bubbles. Based on what I have seen, the bigger the object the less there are bubble issues.
Additionally, I have notice that if you reduce the ratio of Hydroshrink to water the greater the chances of bubble issues within the hydroshrink casting.
When I have used the correct 4 to 1 ratio to reduce 50%, the resulting casting seem to have no air bubbles within the casting. When I have used a 1 to 1 ratios to go from 1/64 to 1/87 the Hydroshrink casting seem to have a significant amount of air bubble. This typically results in bubbling on the surface.
After the mold is made then the first casting in 1/87 requires a lot of rework to smooth out the bubbles. Then a new mold is made from the cleaned 1/87 casting.
The N scale casting you have made seem to have the high concentration of air bubbles like I have seen in the 1/64 reductions. Are you using a different ratio than 1 to 4?
|
|
Lee
Senior Member
Posts: 1,899
|
Post by Lee on Dec 28, 2006 0:45:34 GMT 1
No, I used the 4 to 1 ratio for all my pours. The problem, as I see it, air bubbles are the same size and will cover a larger area of the model when working in a smaller scale. In large castings they would only look like small holes. I am going to try some various additives to see if I can reduce the air bubbles. Maybe even try vacuuming it to suck out the air bubbles.
|
|
|
Post by superba on Dec 28, 2006 3:41:46 GMT 1
Lee:
That makes a lot of sense. I think your right. A vaccuum does sound like a good idea.
|
|
|
Post by charlieb53 on Dec 29, 2006 22:21:52 GMT 1
Very interesting.What do you use for a mold release agent?
|
|