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Old Nov 18, 2004, 06:39 AM
charlieuk is offline
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is there a cnc milling service or can some one help.


im looking for someone to be able to mill me some metal molds to make micro heli blades.they are only 260mm or 10" long and only about 5 mm thick and simetrical. i would be after the mold being in two parts and mabe having it so that i can make a pair at a time.i only need the basic milling done i can do the finishing of. if any one could point me i the right direction that would be great.im posting on here cos you all seam to know alot about the subject.thanks
Last edited by charlieuk; Nov 19, 2004 at 05:12 AM.
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Old Nov 18, 2004, 05:15 PM
OzDragonFlyer is offline
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why metal? Are you planning on injection molding these blades?
Old Nov 18, 2004, 05:29 PM
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no i just wanted a realey solid mold that wouldnt twist and that would last and thorght it would probably be the way forward.what did you have in mind?
Old Nov 18, 2004, 05:48 PM
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If you're handy with CAD you might want to investigate
http://www.emachineshop.com

They specialize in small order stuff. I'm not sure what all processes they have available, but you might give it a try.
Old Nov 18, 2004, 06:36 PM
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You will need a part file in a format a machine shop can process. Your file should be of the actual mold. Go to a machine shop that has a 3 axis mill large enough for your tool. Give them the file and ask for a quote. While you are waiting for a call make sure you have a chair next to the phone, so you don't hurt yourself when you get the price. Repeat until you find the best price.

It won't be cheap, and make sure you specify surface finish. You will still need to polish the mold after you get it from the machine shop.

Greg
Old Nov 20, 2004, 05:44 PM
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I would cast your mold in Devcon. I machine blue wax masters then take cast's from them. My cnc machine only has a capacity of 8"x6", so too small for your blades. Think about making two half blades then bond them to a glass plate, build a dam round them and cast in devcon or fibre glass... It'll be so much cheaper than metal moulds. I make small alloy molds for my injection molding rig, but again it's capacity it 8" max, and the molds are "EXPENSIVE"...


Joules
Old Nov 21, 2004, 03:04 AM
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thanks joules for that but whats devcon ive never heard of it thanks charlie?
Old Nov 21, 2004, 07:48 AM
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Devcon is a very tough epoxy, sometimes loaded with metal particles. It can be used for mold making. I have used it in molds for my injection moulder, it's OK for short runs.

http://www.cromwell.co.uk

check out this link and type "devcon" in the catalogue search in the top left corner of the page.

Check out the, plastic steel liquid. Another alternative is to use JB weld, but this is only in small tubes.


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Old Nov 21, 2004, 02:11 PM
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looks like good stuff any idea how far the 500gm will go and does it come with hardener?thanks
Old Nov 22, 2004, 07:16 AM
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You should be able to find out the volume of the product, then get a jug of water to that volume and fill a container the size of your mould to see how much is used. The product comes with hardner, as far as I know, I never bought it in single quantities, only as a set.

Search the net for Devcon epoxy, to find out the volume, I don't know it's density, or I could have calculated it for you.


Joules
Old Nov 22, 2004, 09:50 AM
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thanks


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