I Cant Get My Mother Mold Parting Shim Work!

[FinnishSpartan]

Hi guys,
I'm having a bit of a problem with my parting shim.
I'm trying to create the parting shim for my mother mold but i cant get anything to stick on the surface of the silicone.
I tried modelling clay to make a parting shim, but it just kept falling off the mold. I also heated it up but it wont work.

So i'm wondering how i could make a parting shim that would actually "stick" to my silicone so that it wouldnt constantly fall off.

thanks.


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So i'm starting up on my new mother mold this weekend,
I would like to know if i could make my mother mold using bondo... Sean mentioned about it saying that i should reinforce it with fiberglass... what did you mean by this?

Also if i make a fiberglass mold, how am i supposed to use a release agent? if i use one wont it just get mixed with the resin? Or do i need a release agent at all?

And what would be the best way to make the "parting lines", what material?
I tried modelling clay but it doesnt stick to the silicone..


Thanks!


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Okay guys, so my helmets mother mold was an epic failure with plaster...
I would like to know how many parts my mold should be and how should i cut them.

I also tought i could switch the material from plaster to something else (since plaster is quite fragile).
I have seen people use fiberglass, would this work well? I also tought about bondo... i think no one has ever even considered this, do you think bondo would work?

also i already "cut out" (the cutting seam) the silicone so that you could get the helmet from inside out.
I know this was propably a stupid error... But what would be the best way to hold the silicone in place for the new mother mold Rubber bands?

Thank you in advance.

-Finish


Moved to molded armor discussion section

 

[Sean Bradley]

Pics are needed for mother mold advise.. we can't tell you how to design your mold seams without seeing the mold.

Not sure about the rubber band idea. You might need to reseal the area you cut with a little silicone, then re-cut it after the mother mold is completed.

Resin or even bondo/resin is a good material for a mother mold, provided you reinfoce it with some fiberglass or something.

 

[FinnishSpartan]

Pics are needed for mother mold advise.. we can't tell you how to design your mold seams without seeing the mold.

I'm actually surprised that a mod didnt look into my progress thread..
http://405th.com/forums/index.php?showtopic=9548

Alltough it's propably my fault i didnt post the pics in this thread...

-Finish

 

[Sean Bradley]

I'm actually surprised that a mod didnt look into my progress thread..
http://405th.com/forums/index.php?showtopic=9548

It's your request.. looking up you pics is not my homework to do... but regardless..

Having a look at it I'd say that that parting line you have going from side to side is going to be your biggest hurdle. You might be able to pull off the rear (behind the parting line as a single piece mother mold, but the front will need to be broken into at least two pieces. either top(above the brim) and bottom (everything below the brim), or possibly a left and right piece.

Theres a bit of undercutting in the front.. that'll be tricky, but I suspect you'll be able to pull a mother mold piece off the front, if it's seperated one of the two ways described above.

How thick is the rubber? It looks a little thin to me.. I'd worry about the mold keying into the mother shell and supporting itself.. ... if that happens the you'll get some warping..

Make sure youcut off those little tendrils hanging off the brim, they'll get stuck in the mother mold and would make re-seating your mold pretty hard.

PM me if you have any other questions. With some additional pics I might be able to be a little more decisive.

 

[FinnishSpartan]

Thanks for the answers sean, i will PM you if any other problems arise.
The silicone is quite thick itself tough (about 10-20mm) That should be thick enough right?

-Finish

 

[Walter Spase]

My mother mold is a three piece shell... front, back, and top... made from Fiberglass (resin and cloth/mat)

Plus everything Sean has said is very, very good advice.

 

[Sean Bradley]

Thanks for the answers sean, i will PM you if any other problems arise.
The silicone is quite thick itself tough (about 10-20mm) That should be thick enough right?

-Finish

So about .3 to .7 inches.. yeah, thats a good thickness. It's tough to tell trom the pics sometimes.

Best of luck.

 

[FinnishSpartan]

My mother mold is a three piece shell... front, back, and top... made from Fiberglass (resin and cloth/mat)

Plus everything Sean has said is very, very good advice.

Really, Happen to have any pics? (i couldnt find any in your pics, sorry)
Yeah, i will still focus on my mold, right now i'm only worried about the lines that i cut trough the silicone.

My mold came out pretty good (from what i saw inside)..

I will more pictures tomorrow (alot more... trust me) As now it's night and not the best lighting for pics..


-Finish


EDIT: Sorry for the bad grammar... so ***** tired..

 

[Walter Spase]

Really, Happen to have any pics? (i couldnt find any in your pics, sorry)
Yeah, i will still focus on my mold, right now i'm only worried about the lines that i cut trough the silicone.

My mold came out pretty good (from what i saw inside)..

I will more pictures tomorrow (alot more... trust me) As now it's night and not the best lighting for pics..
-Finish
EDIT: Sorry for the bad grammar... so ***** tired..

Shoot some Photos later... and edit this post... didn't want you to think I was ignoring you.

 

[odst26]

Shoot some Photos later... and edit this post... didn't want you to think I was ignoring you.

photo's please after you get some sleep

 

[LastSpartan]

You can use Plasti-Paste also. I love that stuff.

On a side note, why is this in the noob forum?

 

[Nicktendo]

Yeah I'd like to see some more photos too.

But from what I can see, yeah, as Sean said, that parting line is gonna make it tough. I don't know how you've cut your silicone, but you might just be able to make a new mother mold along a different parting line. Maybe left and right sides, instead of front and back?

My advice for the mother mold would be to use clay to make a wall for the parting line, and carve registration into the clay so when you remove the clay and do the other side, the mother mold will just fall into place.

As for the material used, plaster plus bandages will give it more strength than just plaster. And if you've got good enough keys in the mother mold, yeah, I've seen rubber bands (or straps) work just fine. Or you could go with the fiberglass method I said I was going with in your other (or was it your other other...) mold making thread.

 

[rvb4life]

Yeah, make a fiberglass shell mold to keep the silicone in place.

 

[FinnishSpartan]

Yeah I'd like to see some more photos too.

But from what I can see, yeah, as Sean said, that parting line is gonna make it tough. I don't know how you've cut your silicone, but you might just be able to make a new mother mold along a different parting line. Maybe left and right sides, instead of front and back?

My advice for the mother mold would be to use clay to make a wall for the parting line, and carve registration into the clay so when you remove the clay and do the other side, the mother mold will just fall into place.

As for the material used, plaster plus bandages will give it more strength than just plaster. And if you've got good enough keys in the mother mold, yeah, I've seen rubber bands (or straps) work just fine. Or you could go with the fiberglass method I said I was going with in your other (or was it your other other...) mold making thread.

Photos coming up in less then 30 minutes

The current parting line in my pictures is made in clay, then covered it with foil.
I have to make a 3 part mold atleast otherwise it wont work, Also it's impossible to have the parting line so that there is a left and a right side, because of the "suncap" undercuts.

And yeah, i used plaster bandages, the problem with that was that the plaster bandages "stretched" so it wasnt a rigid support shell. (i had a very thick mother mold trust me)... The bandages had plaster in them already, the instructions told me to dip the pieces in water... But instead i dipped them in water with plaster for extra strenght.. even that didnt work.

-Finish

 

[Nicktendo]

Also it's impossible to have the parting line so that there is a left and a right side, because of the "suncap" undercuts.

I meant just for the mother mold. But maybe your pics will help.

 

[FinnishSpartan]

I meant just for the mother mold. But maybe your pics will help.

And my epic 4 part mother mold wich didnt work... oh well:

I know it's not thick enough, i didnt bother to finish it..

And a little easter egg for you guys... my sister!! w00t!

-Fin(you can haz pics)ish

EDIT: I just remembered Thorsollis (sorry for spelling wrong) mold:

 

[Nicktendo]

I still don't get why this method won't work.

The silicone covered helmet shouldn't have any dine detailed undercuts, (it doesn't look like it does) so it shouldn't be an issue.

EDIT: my bad, yes it will be. But Thor's method looks good.

 

[FinnishSpartan]

I still don't get why this method won't work.

The silicone covered helmet shouldn't have any dine detailed undercuts, (it doesn't look like it does) so it shouldn't be an issue.

EDIT: my bad, yes it will be. But Thor's method looks good.

Yeah, the brim is what makes that difficult.

-Finish

 

[Walter Spase]

Actually, Thorsolli's Mold is almost constructed the exact same as mine... you can use his pictures for reference.

 

[Dark Rogue]

just a question, why is this in the noob forum?