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Post by austinvfd on Dec 6, 2006 3:41:16 GMT 1
Here is a question for anyone who may venture an answer: Do you think that one could reproduce a fire truck ladder? Not a 2 rail ladder, but a large ladder that you would see on an aerial or platform truck, that has 3 sides. I ask because I am getting tired of buying complete trucks just to get the ladder off for a specific truck project. and I would not want to reproduce all the parts associated with the ladder (turntable, hydraulics etc.) but just the ladder. I would love to be able to produce my own ladders.
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Post by cfesmire on Dec 6, 2006 4:43:46 GMT 1
Sheepscot Scale products has a photo etched brass lattice boom that has 2 square center sections (that is not tapered for the foot or tip of the boom) that measure 16 scale feet each. These would be easy to make into the telescoping boom you show above. new.photos.yahoo.com/stryper50/photo/294928803888425683/0
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Post by superba on Dec 8, 2006 23:19:40 GMT 1
Generated the first casting of the 1964 Ford Country Squire today. The length is correct for 1/87, but the width is almost 1/76.
The shrinkage process worked great. The original master (Ideal Motorific) has proportion issues. Now that I have a resin casting I can start to rework a new master. I have simlar issues with the 63 Rambler 880.
I also made a Alumilite mold for the following 1/64 models
1960 Ford Fairlane Wagon, Johnny Ligthening 1964 Studebaker Wagonair, Corgi Junior 1965 Chevy Impala, Hot Wheels.
Tomorrow, I will create Hydroshrink casting, but I will change the Hydroshrink to water ratio to see if I can achieve 1/87 scale. I hoe the experiment works. If I can impact the shrinkage amount there may be greater opportunities beyond easy 1/43 to 1/87 reductions.
Pictures tomorrow
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Post by only87 on Dec 9, 2006 1:35:54 GMT 1
Tomorrow, I will create Hydroshrink casting, but I will change the Hydroshrink to water ratio to see if I can achieve 1/87 scale. I hoe the experiment works. If I can impact the shrinkage amount there may be greater opportunities beyond easy 1/43 to 1/87 reductions. Pictures tomorrow It should work, mybe you won't get the exact ratio on the first try, but sooner or later it will work out fine. I even had a formula to find the right ratio but I can't find it anymore. But I soon skipped the formula after a few tryouts anyway. The smaller the size of the original master model, the less Hydroshrink is to be used for mold making. The less material is needed the harder it gets to get the ratio right, especially since the viscosity of the Hydroshrink and the water part differs a lot. It is really hard to get the ratio right when half of the Hydroshrink stays in the measuring cup, while the water just drops out. I advise you to keep an account on the ratios you used and the original scale and the final size of the model, it makes working with different scales a lot easier. That way you will soon have a good eye for the ratio needed.
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Post by superba on Dec 9, 2006 3:22:15 GMT 1
I think your right. I was actually going to try three different ratios tomorrow and moniter the results. Th 50% ratio is 4 to 1, I agree that the ratios may differ depending on the size of the master. The 1/25 model apppears to be reducing by 30% not 50%.
I am guessing a 1.75 to 1 ratio may work with 1/64
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Post by superba on Dec 10, 2006 15:59:49 GMT 1
I am seeing different rates in shrinkage on the 1/64 masters. Should have the correct ratio very soon
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Post by superba on Dec 18, 2006 14:25:42 GMT 1
The shrinkage process from 1/64 to 1/87 is working out.
The Hot Wheels 65 Chevy Impala and Corgi 64 Studebaker are almost ready for 1/87 casting. I redid the mold for the 1960 JL Ford Wagon and also made new molds for 1/64 shrinkage for other subjects:
1961 Ford Fairlane JL 1964 Ford Fairlane JL 1964 Dodge 330 JL 1962 Pontiac Catalina Ertl 1967 Plymouth Fury II 1965 Buick Electra 1/55 Siku 1964 Ford Galaxie Maistro 1959 Ford F-100 pickup Racing Champions
Made a mold for 1/43 1961 Ford Falcon Wagon master by Trax. The first Hydorshrink casting will be made today.
The Dinky castings:
1957 Rambler Wagon 1960 Rambler Wagon 1961 Oldsmobile Delta 88 1960 Lincoln Continental 1961 Cadillac
These rubber Hydroshrink castings have almost reached complete 1/87 scale. The Olds, Cadillac and two Ramblers need about 5 more days of curing, then new molds will be made for 1/87 casting.
The 1/25 80's Plymouth Gran Fury is in Banana status with aways to go before I can recast in about 1/50.
I am going to redo the 63 Rambler and the Ford & Mercury Motorifics. The reverse process I did was almost a complete disaster. The Checker, Packard and Lincoln will be done over again using Hydroshrink properly.
The AMT 61 Ford town coupe is almost ready for casting at about 1/48. I will then correctly reduce to 1/87.
Also made a casting of a 1/64 Winross White Cabover. Its been shrinking for about a day.
I am off work for the next two weeks so I hope to make prgress on those models ready for 1/87 casting.
Seventeen projects in progress. The amount of time needed to get these projects running has been minimal.
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skunk
87thScale addict
5th B-day
Posts: 2,762
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Post by skunk on Dec 18, 2006 21:07:38 GMT 1
Wow! You are taking this new process all of the way. When can we expect a nice tutorial? There are a few things I would like to try out for myself... I have a Tomica RR Phantom VI (1:78) just sitting around, collecting dust, for instance.
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Post by superba on Dec 23, 2006 4:53:50 GMT 1
Poured Latex molds for the following in 1/87
1957 Rambler Wagon 1960 Rambler Wagon 1961 Oldsmobile Delta 88 4dr hardtop 1961 Cadillac 4dr hardtop 1965 Chevy Impala 2dr hardtop 1961 Ford Fairlane 4dr Sedan
I 'll make solid resin casting tomorrow to rework and mill out for hollow cast molds. I am learning more each day and having a lot of fun.
Some of the early rubber casting have not shrunk properly, but I am learning proper mixing ratios.....building a learning curve.
The 1/25 Ford Galaxie town coupe silcone latex casting (about 1/45) will be ready for the second phase of mold building tommorow.
This is and important experiment in that I am using one of the original wrong Hydroshrink molds I made in November. As Jerry pointed out, I was using the product improperly.
Pouring resin into the resulting Hydorshrink mold did not work well and destroyed the mold. I am now using Permatex Blue RTV Silicone Gasket Maker. It does not stick to the Hydroshrink mold.
If this process works out. Shrinking 1/25 scale models will cost just a little more than 1/43 scale models. If I use Hydroshrink as designed, making a 1/87 casting off of a 1/25 scale mold will cost about $150.00 versus close to $40.00 per master.
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Post by only87 on Dec 23, 2006 8:40:34 GMT 1
I 'll make solid resin casting tomorrow to rework and mill out for hollow cast molds. . If you have the mold, why mill the model out? If I have a mold ready, I make a solid resin casting, then I sand the outer body parts of the solid cast away (or just cut it away once the resin has set but not yet fully hardened). That way I have a two part mold, the outer silicone part and the inner resin part. Grease the inner part properly and you can make a first hollow cast. With the first hollow casting and the outer silicone mold it's as easy as 1,2,3 to make an inner silicone part. To me this is much easier than milling the model out, also the inner surface gets much smoother.
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Post by superba on Dec 23, 2006 16:11:23 GMT 1
I have been using this method for a couple of years.
Based on a 1/87 master.
Master 1, Mold 1
I typically make a solid casting first....the true master. A one piece mold is produced.
Master 2 Mold 2
Once complete I make a second master, I produce a solid casting from mold 1. This master is then hollowed out and windows are opened. I may also improve the exterior by adding jeweled headlights and other features not in Master 1. I also will build a chassis and interior master to be fitted in the master 2 hollow casting. I then make Mold 2 a two peice mold. This is the modl that I used to make the finished kits I sell on ebay.
When reducing 1/25
Mold 1 is a solid casting of the original 1/25 scale kit. Mold 1 is a one piece mold.
Mold 2 is built of off a reduced Hydroshink rubber casting coming out of Mold 1. its about 1/50 scale.
Mold 3 is built off of a Hydroshrink rubber casting coming out of Mold 2. The rubber casting, now shrunk to 1/87.
Mold 4 detailed two piece mold made off of a new hollow cast fitted to a chassis and interior.
Using Hydroshrink and Allumilite the whole process costs:
Mold 1 about $90 of Allumilite mold Mold 2 about $30 of Alluimilite mold Mold 3 about $7.00 of Allumilite Mold 4 about $7.00 of Allimilite a two piece mold
The experiment with the 61 Ford, is that Mold One is actually made from Hydrshrink. Once produced the actual mold shrinks to 1/50. The Blue RTV casting is then used to produce a second solid casting mold. Once Mold 2 is produced then a Hydroshrink casting is produced. That casting shrinks to 1/87 and then a new mold is produced in 1/87 mold 3. Mold 4 is the two piece detailed hollow cast with interior and chassis.
Mold 1 Hydrowshrink cost about $3.00 Mold 2 1/50 casting cost $30.00 Hydorshrink Mold 3 1/87 solid casting $7.00 Mold 4 1/87 two peice casting $7.00.
There is a big differnece in cost. The Hydroshrink rubber is pretty inexpensive in the big picture.
As Jerry pointed out, the Allumilite costs can also be reduced by cutting up old molds and mixing with new Allumilite. I have done this, but the cutting process is time consuming.
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Post by superba on Dec 24, 2006 0:11:43 GMT 1
Completed the molds discussed yesterday. Poured resin in this morning
1957 Rambler Wagon 1960 Rambler Wagon 1961 Oldsmobile Super 88 Holiday 4dr hardtop 1961 Cadillac 4dr hardtop 1965 Chevy Impala 2dr hardtop 1961 Ford Fairlane 4dr Sedan
Not happy with the Caddy or the 60 Rambler will do again using make new mold using different hydroshrink masters.
Hollowed out the Oldsmobile this afternoon. This was an absolute success. The resulting model has detail in it that I could never create from scratch. Seeing the model in resin has floored me.
All proportions are totally correct. detail in door crack and or hood and trunk openings are pefect. I can even read the Oldsmobile lettering in the lower front grille.
I compared to a Classic Metal Minature 61 Chevy Impala. The detail in the resin casting is superior to the diecast Chevy.
The overall resulting model is the best I have ever produced. The entire process will greatly improve my ability to make detailed 1/87 models.
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Lee
Senior Member
Posts: 1,899
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Post by Lee on Dec 24, 2006 3:03:08 GMT 1
Joe, It sounds like you have opened up a whole new way of getting many new models into the 1/87th realm. Congratulations on your success!! ;D Jerry and I wish you nothing but the best with your expanded line of fine models.
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Post by superba on Dec 24, 2006 15:26:53 GMT 1
Jerry & Lee
I hope this process works for all of us... I know you guys were planning on experimenting too...good luck.
Poured molds last night for
1964 Dodge 330 two door sedan 1961 Pontiac Catalina two door Hardtop 1960 Lincoln four door sedan 1964 Studebaker Wagonair 1964 Ford Fairlane
and redid the 1960 Rambler Wagon, more casting today in between getting ready for Christmas.
I am also monitering the shrinking process for:
1985 Plymouth Gran Fury 1954 Checker A4 1948 DeSoto Four Door 1961 Ford Falcon Wagon
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MSteele
Junior Member
On Youtube now!
Posts: 241
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Post by MSteele on Dec 24, 2006 16:08:31 GMT 1
One i would like to see made is the matchbox 2000 chevy impalia police car.
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