How do you make cast resin parts
01-25-2007, 04:05 PM
#1
Senior Member
Thread Starter
Join Date: Nov 2005
Location: VERO BEACH, FL
Posts: 468
Likes: 0
Received 0 Likes
on
0 Posts
How do you make cast resin parts
If I build a second 33" Dumas Pt-109, it will only be if I can figure how to build it light. with 3 motors maby small brushless ones. The weight problem with three motors is hard to overcome.
One of the things I need to know is how to make cast resin parts from the "lead" ones suppilied in the kit, could anyone tell me how to do this, thanks, Randy.
One of the things I need to know is how to make cast resin parts from the "lead" ones suppilied in the kit, could anyone tell me how to do this, thanks, Randy.
01-25-2007, 05:19 PM
#2
Senior Member
Join Date: Nov 2003
Location: McAlester,
OK
Posts: 1,768
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
The 'quick-n-dirty' answer is to make a mold of the required part. Remove part. Cast resin using the mold. Didn't really tell you anything new, did I. From there it gets a bit more complicated because some parts are not exactly easy to cast a mold around and still get the part out without destroying the mold. How do you do that? How should I know, I can't do it either!
- 'Doc
- 'Doc
01-25-2007, 06:11 PM
#3
Join Date: Dec 2003
Location: PDX, OR
Posts: 1,664
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
Oh oh Oh oh oh oh oh!!...
I know! I know...
Have a look here where we posted some tutorials...
http://www.queensown.org/constructio...g-casting.html
[8D]
I know! I know...
Have a look here where we posted some tutorials...
http://www.queensown.org/constructio...g-casting.html
[8D]
01-25-2007, 06:24 PM
#5
Senior Member
Thread Starter
Join Date: Nov 2005
Location: VERO BEACH, FL
Posts: 468
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
Disreguard my very last post, I jumped to answer the first answer and overlooked the second on, thanks, Randy.
01-25-2007, 06:26 PM
#6
Join Date: Dec 2003
Location: PDX, OR
Posts: 1,664
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
You need to use a sulfer free clay. Different chemicals in the clay may inhibit the cure of the RTV.
Sulfer is one of those chemicals. I don't know what play doh is made up of.
Can't be too bad since it is non toxic. I have never tried play doh.
[&:]
There are several companies that make RTV and casting material available.
Tap Plastics
Smooth-on
Alumilite
Those are the ones that come to mind, others have a larger variety of RTV and
resins available depending on your requirements and skills.
Sulfer is one of those chemicals. I don't know what play doh is made up of.
Can't be too bad since it is non toxic. I have never tried play doh.
[&:]
There are several companies that make RTV and casting material available.
Tap Plastics
Smooth-on
Alumilite
Those are the ones that come to mind, others have a larger variety of RTV and
resins available depending on your requirements and skills.
01-26-2007, 04:23 PM
#8
Join Date: Dec 2003
Location: PDX, OR
Posts: 1,664
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
Thanks Kmot,[8D]
One of our guys transposed it to the QO website.
Some of the text looks chopped. I tried to edit it, but
darned if I can find where the gallery is even stored.[&:]
These were the original tutorials.
http://groups.msn.com/QueensOwnAxisC...urwebpage.msnw
And, I am less and less a fan of Tap plastics as they have gone through
some formulation changes. Most of their material cures too quickly for me.
One of our guys transposed it to the QO website.
Some of the text looks chopped. I tried to edit it, but
darned if I can find where the gallery is even stored.[&:]
These were the original tutorials.
http://groups.msn.com/QueensOwnAxisC...urwebpage.msnw
And, I am less and less a fan of Tap plastics as they have gone through
some formulation changes. Most of their material cures too quickly for me.
02-04-2007, 12:05 PM
#10
Junior Member
Join Date: Jul 2005
Location: thornton,
CO
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
heres one way,,,, i modeled some engine parts and a bofors canon, and some simulted rivoted panels with this technique.
materials:
aluminum foil (the real thin stuff)
plaster of paris or drywall mud
polystyrene sheet or rod or just scraps of polystyrene like parts sprews
poltstyrene liquid cement (the kind that melts the polystrene for a better bond)
the part you want to model
some fine tipped toothpicks or fine tipped tools like tweezers,etc for forming and pressing the foil into the detail areas
cut a piece of foil about an inch larger than the part being modeled in length and width. using your fingers press the foil against the part and carefully use a toothpick or tool to press the foil into any detail you cant yet see in the foil side. once you get all the detail you want leave the part in the foil and lay the part on a flat surface with the foil side up. coat the foil side with a thin layer of plaster taking care not to disturb the foil pressed against the part. after the first layer of plaster dries apply a second coat of plaster and allow to dry. set the foiled part aside for now. now just to clarify the part is not completely wrapped in foil just one side.
cut small pieces of styrene and place into an airtight glass container (i used small glass spice jars with plastic lids) clear glass will allow you to know without doubt when the mixture is ready. anyway about a tablespoon of styrene cuttings or pieces and two tablespoons of cement in the glass jar and a little time will yield a styrene paste. liquid polystyrene.
remove the part form the foil and inspect the foil negative mold. make sure you see all the detail in reverse that you see on the part being modeled. if all is ok then use a toothpick or tool to first drip then carefully push the paste into all corners and detail areas of the foil negative mold. once the mold is full of plastic set it aside and let the plastic cure, the cement will evaporate and the plastic will harden.
once the plastic is hard carefull peel back the foil, the plaster will break away and your part should pop right out. inspect it for detail. now you can use the new part to make a permanent mold using fibreglass or resin and then simply use the liquid cement to melt the part out of the mold or use the part on your model as is.
this seems like a long drawn out process however once you get the hang of it and learn the little things that happen in this method you can create a lot of parts in a single afternoon.
materials:
aluminum foil (the real thin stuff)
plaster of paris or drywall mud
polystyrene sheet or rod or just scraps of polystyrene like parts sprews
poltstyrene liquid cement (the kind that melts the polystrene for a better bond)
the part you want to model
some fine tipped toothpicks or fine tipped tools like tweezers,etc for forming and pressing the foil into the detail areas
cut a piece of foil about an inch larger than the part being modeled in length and width. using your fingers press the foil against the part and carefully use a toothpick or tool to press the foil into any detail you cant yet see in the foil side. once you get all the detail you want leave the part in the foil and lay the part on a flat surface with the foil side up. coat the foil side with a thin layer of plaster taking care not to disturb the foil pressed against the part. after the first layer of plaster dries apply a second coat of plaster and allow to dry. set the foiled part aside for now. now just to clarify the part is not completely wrapped in foil just one side.
cut small pieces of styrene and place into an airtight glass container (i used small glass spice jars with plastic lids) clear glass will allow you to know without doubt when the mixture is ready. anyway about a tablespoon of styrene cuttings or pieces and two tablespoons of cement in the glass jar and a little time will yield a styrene paste. liquid polystyrene.
remove the part form the foil and inspect the foil negative mold. make sure you see all the detail in reverse that you see on the part being modeled. if all is ok then use a toothpick or tool to first drip then carefully push the paste into all corners and detail areas of the foil negative mold. once the mold is full of plastic set it aside and let the plastic cure, the cement will evaporate and the plastic will harden.
once the plastic is hard carefull peel back the foil, the plaster will break away and your part should pop right out. inspect it for detail. now you can use the new part to make a permanent mold using fibreglass or resin and then simply use the liquid cement to melt the part out of the mold or use the part on your model as is.
this seems like a long drawn out process however once you get the hang of it and learn the little things that happen in this method you can create a lot of parts in a single afternoon.
02-08-2007, 03:33 AM
#11
Senior Member
Join Date: Jan 2007
Location: birmingham, UNITED KINGDOM
Posts: 113
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
hi ya
there is sme thing called injection moulding wich is a mould with little opening tubes (placing in the places were the resin is most likely NOT to reach. just attach a seringe on to one of these ends and force the resin into it(while rolling the mould abut a bit) when it uzes out the outher side you know to stop (make sure the one you are injectiong thought is lower than the outher one) then cut the tube ont block it by folding it and using an elastic band (or cable tie) then just wait!!!
i recomend grasing the inside or layering it with some sort of film (i think cling film will work quite well but havent tried it)
you can get the reain from a place called "hobby craft" it is used when setting planting into the cups to make it look like water.
hope this may help!!!
there is sme thing called injection moulding wich is a mould with little opening tubes (placing in the places were the resin is most likely NOT to reach. just attach a seringe on to one of these ends and force the resin into it(while rolling the mould abut a bit) when it uzes out the outher side you know to stop (make sure the one you are injectiong thought is lower than the outher one) then cut the tube ont block it by folding it and using an elastic band (or cable tie) then just wait!!!
i recomend grasing the inside or layering it with some sort of film (i think cling film will work quite well but havent tried it)
you can get the reain from a place called "hobby craft" it is used when setting planting into the cups to make it look like water.
hope this may help!!!
02-16-2007, 01:49 PM
#12
RE: How do you make cast resin parts
You might want to take a look at this site, www.alumilite.com as they sell a very lightweight casting resin and the stuff to make molds with.. It took me dys to remember the name of the place as it's about 4 blocks south of where I work. My now ex brother-in-law used this stuff a lot in his business.
02-16-2007, 02:23 PM
#13
Join Date: Dec 2003
Location: PDX, OR
Posts: 1,664
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
ORIGINAL: Ron Olson
You might want to take a look at this site, www.alumilite.com as they sell a very lightweight casting resin and the stuff to make molds with.. It took me dys to remember the name of the place as it's about 4 blocks south of where I work. My now ex brother-in-law used this stuff a lot in his business.
You might want to take a look at this site, www.alumilite.com as they sell a very lightweight casting resin and the stuff to make molds with.. It took me dys to remember the name of the place as it's about 4 blocks south of where I work. My now ex brother-in-law used this stuff a lot in his business.
What?? My earlier post didn't help you recall Alumilite?[&:]
02-16-2007, 03:44 PM
#15
Senior Member
RE: How do you make cast resin parts
Don't ignore these people
http://smooth-on.com/distrbtr.htm
They have a starter kit which will let you make many molds for about $30. Look at the oomoo 25 & 30 product list. The molds retain every bit of detail, set up fairly fast, the parts cure in a short time.
Tug
http://smooth-on.com/distrbtr.htm
They have a starter kit which will let you make many molds for about $30. Look at the oomoo 25 & 30 product list. The molds retain every bit of detail, set up fairly fast, the parts cure in a short time.
Tug
02-16-2007, 07:49 PM
#16
Join Date: Dec 2003
Location: PDX, OR
Posts: 1,664
Likes: 0
Received 0 Likes
on
0 Posts
RE: How do you make cast resin parts
ORIGINAL: Tug Guy
Don't ignore these people
http://smooth-on.com/distrbtr.htm
They have a starter kit which will let you make many molds for about $30. Look at the oomoo 25 & 30 product list. The molds retain every bit of detail, set up fairly fast, the parts cure in a short time.
Tug
Don't ignore these people
http://smooth-on.com/distrbtr.htm
They have a starter kit which will let you make many molds for about $30. Look at the oomoo 25 & 30 product list. The molds retain every bit of detail, set up fairly fast, the parts cure in a short time.
Tug
Oh wait, you gave them a link...
