DIY Vac Forming

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6 years 4 months ago #1 by turtle65
DIY Vac Forming was created by turtle65
Here's the method I've been using for years (at least 15+), pretty basic - if I can do it then anyone can.

Any Q's, just yell out and I'll do my best to try and answer ;)



"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !
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6 years 4 months ago #2 by grover
Replied by grover on topic DIY Vac Forming
Awesome tutorial turtle. Not that Im going to do it myself, my wife would kill me is I started expanding on what I have already :D

Kane
On the Bench - Tamiya 1:48 F-117

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6 years 4 months ago #3 by Hadley
Replied by Hadley on topic DIY Vac Forming
Was thinking this a few hours ago.
And what if you have a plastic mould but want duplicates?
What could you put in the make the "mould" template?
And what would u use if you wanted clear plastic?

In the build:
3x 1/24 Subaru rally cars
1/35 AH-6J Little bird
1/48 AH-1W Cobra

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6 years 3 months ago #4 by turtle65
Replied by turtle65 on topic DIY Vac Forming
Hi ya Hadley,
For clear plastic masters I still use MDF as the base master pattern but give it several coats of lacquer paint then polish it before doing the vac-forming.
Evergreen has a variety of clear sheet thicknesses, for some reason I've never had decent results with Plastruct products :blush: .
It's always best not to take a copy off of an original kit piece because the copy will be larger than the original. When creating a master pattern you can make allowances for the sheet plastic thickness.
HTH.

"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !

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6 years 3 months ago #5 by Gary
Replied by Gary on topic DIY Vac Forming
If I wanted to copy a canopy I'd use Milliput as it's heat resistant and doesn't shrink as it cures, I'd smear some Vaseline inside the canopy to stop the Milliput from sticking and then squeeze it in.



'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'

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6 years 3 months ago #6 by Hadley
Replied by Hadley on topic DIY Vac Forming
What's the deal with Milliput?
Apparently you mix the 2 together so it's all one colour then mould to how u want and leave for 3-4 hours to go hard
I've done so and after 3-4 days I can still squeeze it (it's still soft)

In the build:
3x 1/24 Subaru rally cars
1/35 AH-6J Little bird
1/48 AH-1W Cobra

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6 years 3 months ago #7 by Gary
Replied by Gary on topic DIY Vac Forming
You mixed it wrong, either not enough mixing or the wrong quantities, it will even set under water (I know I used it to fix a leaking water tank once).



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6 years 3 months ago #8 by Hadley
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Gary wrote: You mixed it wrong, either not enough mixing or the wrong quantities, it will even set under water (I know I used it to fix a leaking water tank once).

Mixed half and half
I had the feeling it might be off/old as one colour was slightly dif on the outside than inside

In the build:
3x 1/24 Subaru rally cars
1/35 AH-6J Little bird
1/48 AH-1W Cobra

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6 years 3 months ago #9 by Woadism
Replied by Woadism on topic DIY Vac Forming

Hadley wrote:

Gary wrote: You mixed it wrong, either not enough mixing or the wrong quantities, it will even set under water (I know I used it to fix a leaking water tank once).

Mixed half and half
I had the feeling it might be off/old as one colour was slightly dif on the outside than inside


It can certainly dry out - I had to scrape off the outer surface of mine (even when it first arrived, thanks for the old stock seller!) but the insides were still good - it took a bit longer to set, but was still like rock within half a day so not sure what's happening for you sorry! I used it to try and scratch some cushions (failed - I am no sculpter!) and re-shape a Skyhawk tail to square it off as a kiwi airframe (worked great but oh boy the sanding).

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6 years 3 months ago #10 by Gary
Replied by Gary on topic DIY Vac Forming
Try warming up the individual components with a hair dryer prior to kneading and they will mix and cure a bit easier.



'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'

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6 years 3 months ago #11 by turtle65
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Here's a tip from the 'cheap' seats -
Throw away these expensive "modelling putties" and nip down to SuperCheap Auto/Bunnings/M10 or whatever and grab a 1KG Tin of Builders Bog (about the same price as your tiny little epoxy putty ;) .
Very easy to mix/apply and shape/finish. Feathers far better than any of the modelling putties I've ever used.

Give it a try, I think you'll be surprised with the results :woohoo: .

"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !
The following user(s) said Thank You: Woadism

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5 years 6 months ago #12 by 1/35th Battalion
Replied by 1/35th Battalion on topic DIY Vac Forming
Wacko Sir, Great Tutorial; Bugger! Now I have no excuse :P

David

On the Bench:
Tamiya 1/24 Alfa Romeo 155 V6 TI (1993 DTM) - "Built to Race" GB
Revell 1/24 '77 GMC Sierra 1500 4x4 - getting the "Mad-Maxed" treatment - moving to the "Diorama" GB

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5 years 6 months ago #13 by turtle65
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That's right - no excuses now :lol: .
I've actually updated/simplified my set-up so will post some photo's of the new set-up in the next day or so :S .

"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !

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5 years 6 months ago #14 by turtle65
Replied by turtle65 on topic DIY Vac Forming
As per previous post - the simplified frames etc.
Sheet plastic is just clamped into the frame with folding clips now - quicker and easier that the previous method.
Frames are now larger than the vac boxes to make allowances for the new clamping method and as a bonus creates a better suction seal.
Vac boxes have been resized to more 'useful' sizes (vacuum hose still connects underneath, some folks have theirs on the side)
New holder for the frames while in the oven - bit extravagant but does the job :)
Actually have three box and frame sizes, just haven't gotten around to finishing the middle size :ohmy: .







Any Q's just yell out and I'm sure someone will assist :lol:

"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !

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5 years 6 months ago #15 by Powder
Replied by Powder on topic DIY Vac Forming
Possibly a dumb question, but do you fasten/dowel the master to the vacuum box in any way?

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5 years 6 months ago #16 by turtle65
Replied by turtle65 on topic DIY Vac Forming
No such thing as a dumb question - only dumb answers :silly: .
Nope, no need to fasten in any way to the vac-box. If you are worried it might move while placing the styrene sheet over it then I guess there would be no problems, (personally if I was to do it I'd just use some double-sided tape).
However you do want the master to easily lift off with the styrene sheet once formed, as the styrene will be very tightly connected to the master, and could cause damage to the master/formed piece or box if just trying to pull the sheet away.
HTH.

"No, I didn't lose my mind. It got scared and ran away"

On the Bench:
Scratch - Steam Car
Scratch - Santa's sleigh
Scratch - EggCopter Ka-26
Scratch - EggPlane !
The following user(s) said Thank You: Powder

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