Bob the Alien (Giger inspired Alien)
- Thread starter Leigh
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Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Yep, just poured the last coat of rubber
I was hoping to get the jacket made up first thing in the morning, that would give the rubber 12-14 hours of curing before making the jacket.
Is that enough?? or should I leave the rubber to cure for longer before hitting it with polyester??
Yep, just poured the last coat of rubber
I was hoping to get the jacket made up first thing in the morning, that would give the rubber 12-14 hours of curing before making the jacket.
Is that enough?? or should I leave the rubber to cure for longer before hitting it with polyester??
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Are you talking about the little groove/channel that can be carved into the perimeter of the mold's edge?
Also is it really that helpful? I only see it only some molds and not others? Is there a reason not to have that feature?
Also, can't that be just pressed into the clay before pouring the silicone too.
Are you talking about the little groove/channel that can be carved into the perimeter of the mold's edge?
Also is it really that helpful? I only see it only some molds and not others? Is there a reason not to have that feature?
Also, can't that be just pressed into the clay before pouring the silicone too.
garlicbread
Well-Known Member
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
I'm really impressed by the clean and professional mould making you're doing...not to mention the sculpting
What you're doing with the teeth etc, I've used that method when moulding hands/fingertips as I was fed up with getting bubbles in them!
I'm really impressed by the clean and professional mould making you're doing...not to mention the sculpting
What you're doing with the teeth etc, I've used that method when moulding hands/fingertips as I was fed up with getting bubbles in them!
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
OK, The moulds all done
I might give it a test run tomorrow morning, at the moment I'm giving the parts of it a little airing in the garden to de-fume a bit
I've had a good close look over the inner mould surfaces & I cant find a single bubble All the parts fit together like a dream
Some pic's:
OK, The moulds all done
I might give it a test run tomorrow morning, at the moment I'm giving the parts of it a little airing in the garden to de-fume a bit
I've had a good close look over the inner mould surfaces & I cant find a single bubble
All the parts fit together like a dream Some pic's:
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Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Polyester and silicone don't have a whole lot to say to each other, chemically speaking, AFAIK. Doubt there's any cause for concern. Mould looks good!!
Yup.
Can be. Mould I made a couple of weeks back had an inadequate gasket and leaked a fair bit. Fortunately I was about to make another that was nearly identical, for a part that had the same interior but a slightly different outside. I split the first mould, re-cut the female gasket line deeper and made a new top half for that mould, so that it had a taller male gasket. Worked a treat. (For the second mould I used the original top half from the first mould, plus the second master, instead of claying that piece up. It had a male gasket which was proven inadequate so I removed it and cut a new female line into the mould piece, so that the new lower half when I poured it would have the taller male gasket required. Silicone ain't cheap in Oz, this saved a lot of waste.)
Depends on a lot of things - resin viscosity, setting time, ambient temperature, all sorts of things. If you have a wide flange around the part and a good mating surface, you may not need it.
Sure; that gives a more pro-looking result too if you take your time. I also build them up off the clay bed, using a worm of clay. Depends on how much time you have.
Promising!
Polyester and silicone don't have a whole lot to say to each other, chemically speaking, AFAIK. Doubt there's any cause for concern. Mould looks good!!
Yup.
Can be. Mould I made a couple of weeks back had an inadequate gasket and leaked a fair bit. Fortunately I was about to make another that was nearly identical, for a part that had the same interior but a slightly different outside. I split the first mould, re-cut the female gasket line deeper and made a new top half for that mould, so that it had a taller male gasket. Worked a treat. (For the second mould I used the original top half from the first mould, plus the second master, instead of claying that piece up. It had a male gasket which was proven inadequate so I removed it and cut a new female line into the mould piece, so that the new lower half when I poured it would have the taller male gasket required. Silicone ain't cheap in Oz, this saved a lot of waste.)
Depends on a lot of things - resin viscosity, setting time, ambient temperature, all sorts of things. If you have a wide flange around the part and a good mating surface, you may not need it.
Sure; that gives a more pro-looking result too if you take your time. I also build them up off the clay bed, using a worm of clay. Depends on how much time you have.
Thank you
So it should work then
Promising!
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Thank you mate
Interestingly, I've noticed that it seems the silicone has absorbed the pong from the polyester :confused
That's why I aired the moulds yesterday. Its quite odd, the silicone smells very strongly of polyester yet the polyester parts no longer have a strong odour?
I shall be running a cast at some stage this morning I'm looking forward to see how it comes out
Thank you mate
Interestingly, I've noticed that it seems the silicone has absorbed the pong from the polyester :confused
That's why I aired the moulds yesterday. Its quite odd, the silicone smells very strongly of polyester yet the polyester parts no longer have a strong odour?
I shall be running a cast at some stage this morning
I'm looking forward to see how it comes out
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
OK Well, I wouldn't say the first cast was a 100% success but I'm certainly not disappointed
I've learned some useful stuff here... Firstly I'll add that Gasket line into the mould next time as I did get a bit of flashing. It didn't leak out of the mould but I'd prefer less flashing. The flashing broke off cleanly with very minimal clean up though
I will make up a stainless steel rod to replace the wooden rod I used to cast the hinge holes into the jaw, the wooden one stuck fast despite using release on it :facepalm
I'll need to use a bit more resin for each cast of the jaw, it's a bit thin in places. I used 600g, in future I'll use 700g-750g.
I need to work on my slushing technique
The fangs failed to come out well but I do know what went wrong there. Yesterday I cleaned the mould with soap n water, those little holes left by the sprue retained a bit of water. I did try to blow the water out but I guess there was still some in there. The water combined with the talc I used on the inside of the mould as well :rolleyes When I de-moulded this the tips were sticky so I guess the water also inhibited the curing at the tips, however the front teeth have come out as intended
Other than that I'm really pleased with the cast There are no bubbles & all the detail has come out really well
OK Well, I wouldn't say the first cast was a 100% success but I'm certainly not disappointed
I've learned some useful stuff here... Firstly I'll add that Gasket line into the mould next time as I did get a bit of flashing. It didn't leak out of the mould but I'd prefer less flashing. The flashing broke off cleanly with very minimal clean up though
I will make up a stainless steel rod to replace the wooden rod I used to cast the hinge holes into the jaw, the wooden one stuck fast despite using release on it :facepalm
I'll need to use a bit more resin for each cast of the jaw, it's a bit thin in places. I used 600g, in future I'll use 700g-750g.
I need to work on my slushing technique
The fangs failed to come out well but I do know what went wrong there. Yesterday I cleaned the mould with soap n water, those little holes left by the sprue retained a bit of water. I did try to blow the water out but I guess there was still some in there. The water combined with the talc I used on the inside of the mould as well :rolleyes When I de-moulded this the tips were sticky so I guess the water also inhibited the curing at the tips, however the front teeth have come out as intended
Other than that I'm really pleased with the cast
There are no bubbles & all the detail has come out really well
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Alaneye
Sr Member
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
I can't see the pix yet as I'm at work (but will be checking it out as soon as I get home), but just wanted to say that a gasket line won't stop flashing, but it will help to stop the resin from running right out. You will probably always have some flash somewhere. The other thing is that water and resins isn't usually a good combination, especially with urethanes which tend to foam up if there is any moisture present.
I can't see the pix yet as I'm at work (but will be checking it out as soon as I get home), but just wanted to say that a gasket line won't stop flashing, but it will help to stop the resin from running right out. You will probably always have some flash somewhere. The other thing is that water and resins isn't usually a good combination, especially with urethanes which tend to foam up if there is any moisture present.
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Many thanks guy's
Alan, the foaming thing seems like what happened at the tip's of the teeth, Thanks
I've now managed to dry the mould fully, I need to clamp the jacket together in more places so I'm going to pick up some bolts & wing nuts for that.
It should work better next time
This first cast wont go to waste, I have uses for it
I'm busy making a mould for the upper teeth at the moment, I'll post a pic when its done
Many thanks guy's
Alan, the foaming thing seems like what happened at the tip's of the teeth, Thanks
I've now managed to dry the mould fully, I need to clamp the jacket together in more places so I'm going to pick up some bolts & wing nuts for that.
It should work better next time
This first cast wont go to waste, I have uses for it
I'm busy making a mould for the upper teeth at the moment, I'll post a pic when its done
vaderdarth
Master Member
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
just beautiful leigh!!!!
just beautiful leigh!!!!
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
Thanks guy's
Here's those front upper teeth:
Even though I dusted the mould well I'm still getting air trapped in the tips of the fang's :confused
I didn't use the sprue technique with the upper teeth mould just to see if it would work any better without them.
Its an easy fix with a tiny bit of stopper or putty but I wanted them to come out perfect every time. Other than the tips of the fangs I cant complain, in fact I'm very happy so far
Thanks guy's
Here's those front upper teeth:
Even though I dusted the mould well I'm still getting air trapped in the tips of the fang's :confused
I didn't use the sprue technique with the upper teeth mould just to see if it would work any better without them.
Its an easy fix with a tiny bit of stopper or putty but I wanted them to come out perfect every time. Other than the tips of the fangs I cant complain, in fact I'm very happy so far
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sskunky
Sr Member
Re: Bob the Alien (Giger inspired Alien) Sculpting finished page 45
When you cast them pour a little resin into the teeth and tease it into the tips with a cocktail stick then pour in the rest with the top plug in. When you talk the mould make sure you bang or blow out as much as you can so there's none stuck in the tips of the teeth.
When you cast them pour a little resin into the teeth and tease it into the tips with a cocktail stick then pour in the rest with the top plug in. When you talk the mould make sure you bang or blow out as much as you can so there's none stuck in the tips of the teeth.
