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Casting Molds

Jim

Jim

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Oct 19, 2011
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15,617
They aired ok Frankie, but wasn't square, i have them but need to run them thru the bandsaw and square them up before i can drill them .. They are on my to do table ... :thumbs:
 
Jim

Jim

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Well the mould turned out ok, i removed the sides and slightly pulled on the rubber and it just came away from the corian, so i am pleased with the result. The line you can see inside the mould is the gap between the two pieces of corian slabs that i used ... Now i am going to try making a vertical one. :thinks:

silicone_rubber_pen_mould.jpg
 
Jim

Jim

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bellringer said:
Jim how much did it cost to make and how easy was it
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Bellringer, i bought 1.1Kg which was £20.00 including VAT, then postage on top of this. It was quite easy to make once i slowed down with the stirring. Making the actual box was the hardest part, making sure the inner part was 6" square. If you fancy making one just drop me a PM if you need any questions answering, or you can post here. :thumbs:


turnaround360 said:
Jim well done mat that looks excellent was that shore 28 or 30 silicone.Frankie.
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Frankie, all i can tell you is this, it is called, Polycraft GP-3481-F General Purpose RTV Silicone Mould Making Rubber ...:nooidea:
 
Y

Yorkie

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Mar 9, 2013
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I'll be coming over to England at the end of April. You can ship them to me and I will bring them over and we can figure it out from there.
 
A

ataylor

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Andy
When will this be tested mate? Do you just pour the resin in or do you have to coat the inside of the mould? :thinks:
 
Jim

Jim

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You can pour it straight in Tony, but it is recommended to use some release agent for longer life. I don't have much resin left so not sure if i can try it out just yet? :thinks:
 
Jim

Jim

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Alex, the material and procedure of making this mould was ok, if i was to do it again i wouldn't make it as big, i would go for a size capable of making to blanks ... :bwink:
 
M

mervyn cadman

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Jun 19, 2013
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Hi guys I may be able to help on this casting idea you don't need to spend all your pocket money on moulds for casting blanks I have made thousands of pen blanks and still to this day I cast blanks of all sizes.

1. Get some 20mm or 25mm aluminium tubes from eBay don't use plastic pipe the ali ones I find are much easier to work with.

2. You will need some wine corks (tapered ones)

3 for the 25mm blanks turn your own wooden plugs.

4. Honey wax is the release agent you will need.

5 the 20mm tubes cut to size will use about 100ml of PR

5. the catalyst is at a ratio of 1ml per 100ml it pays to drop the catalyst by 10% if not more if your casting larger blanks like I done for the woodturning magazine along with George Watkins who turned the form, the blank was 8" in diameter x 9" inch and weighed about 3 kilo the catalyst was dropped by 50% due to the volume of resin remember this stuff gets hot like hot kettle that’s cooled down for around ten minutes.

I remember two years ago I cast two blanks for a young artist 50mm x 1000mm yes guys a meter long - these were HOT! The gloves I used melted to the side of the moulds.

Remember the catalyst will work better if less is better - too much hardener and the blanks become brittle.

I hope some of this helps guys.
:thinks::thinks::thinks:
 
Jim

Jim

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Thanks for the info Mervyn, especially about the aluminium tubes and not the PVC ones ... :thumbs:
 
Jim

Jim

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Just had a quick look on ebay for the aluminium tubes
Aluminium Tube 7/8" / 22mm od x 495mm Long + 2 END CAPS
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would the end caps be sufficient enough to seal the ends instead of the corks Mervyn ... :thinks:
 
M

mervyn cadman

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Jim said:
Just had a quick look on ebay for the aluminium tubes would the end caps be sufficient enough to seal the ends instead of the corks Mervyn ... :thinks:
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Jim don't worry about getting the end caps I turned my own plugs sort of tapered for the larger tubes, on the 22m od wine corks will work great I have used mine hundreds a times over the 500mm tubes is what I use cut them slightly over sized Jim to allow for the cork and trimming the blanks after the have cured.

This is a 25mm blank I made Jim within the 25mm ali tubes (my Guinness Effect) and the one at the bottom is my black and gold - the gold being Pearl-Ex powder.




Don't get the end caps Jim you won't need them -cheeper to buy wine corks or save them for the 25mm just turn your own plugs Jim

Merv
 
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