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Old 02-19-2014, 05:20 AM   #1
fastpcuser
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Default CNC Cutting Service...

I have a small CNC machine with cutting area of 14.75"x14.75" that is my max. Ihave been cutting some goblin frames lately and other custom quadcopter, tricopter, Trex 450, Goblin (500,700,700C) frames ..etc...

If you want to see some pictures you can see my other thread in CAD/CAM called "Goblin 700 Frames" .

My Carbon fiber is Pure ("real") I have tested it and there is no fiberglass or any other fill ins, it is conductive all the way through.

Currently I have in stock:

1.0mm G10 Black
1.5mm G10 Black
2.5mm G10 Black

2.00mm Carbon Fiber -- In stock next week
2.50mm Carbon Fiber
3.00mm Carbon Fiber -- Only one sheet left ( 500mmx500mm)
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Old 02-28-2014, 02:43 PM   #2
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Hi,
Curious...how do you hold the sheet to the table for cutting? I've always wondered how they do it for production.
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Old 03-02-2014, 03:49 PM   #3
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Quote:
Originally Posted by ScotY View Post
Hi,
Curious...how do you hold the sheet to the table for cutting? I've always wondered how they do it for production.
They just clamp the sheet to the table.

https://www.google.com.tr/search?q=c...w=1259&bih=665
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Old 03-02-2014, 04:16 PM   #4
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It doesn't seem practical to clamp thin sheet? Maybe a vacuum table is used?
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Old 03-03-2014, 04:56 PM   #5
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I use small screws to hold all the pieces down... Vacuum table would nice but sometimes they just hold the whole sheets and use software generated tabs to hold the pieces within that sheet then they just brake it off....
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Old 03-20-2014, 09:03 PM   #6
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How do you know your Carbon Fiber is "Pure"???
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Old 03-26-2014, 01:39 PM   #7
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Default CNC Cutting Service...

Because carbon fiber is conductive fake carbon (fiberglass sandwich) is not I have split my carbon fiber and tested , if you brake apart original goblin frames the will not conduct electric current. That's because they are fiberglass with two sheets of cf ... One on top and one on bottom


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Old 05-28-2014, 03:18 PM   #8
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Here is more information on my cutting and will be posting some pictures soon

http://www.helifreak.com/showthread.php?t=626182
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Old 05-28-2014, 03:36 PM   #9
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Quote:
Originally Posted by ScotY View Post
Hi,
Curious...how do you hold the sheet to the table for cutting? I've always wondered how they do it for production.
For large production they use a vacuum table, usually a sheet of mdf, and a vacuum powerful enough to suck through the mdf! (10+ HP, loud enough it's in a separate room http://www.cncrouterstore.com/invent...del-16556.html ) and they lay aluminum foil over the cut parts as the machining progresses to keep from losing vacuum on the rest of the sheet. For heli frames like he's making and small production, a few screws does the trick. Usually clamp the sheet down, drill a few of the holes in key places, screw the sheet down and drill and machine the parts, making sure the rapid height is above the screw heads.

I use a completely different method for the tiny parts I make, and cut them under water.
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Old 05-29-2014, 02:15 PM   #10
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Hey Dylan,

Thanks for the info. I had read about the vacuum table stuff but never heard about the aluminum foil. Neat trick.

Curious how you cut your parts as they are very precise and so small!
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Old 05-29-2014, 02:32 PM   #11
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Hey Dylan,

Thanks for the info. I had read about the vacuum table stuff but never heard about the aluminum foil. Neat trick.

Curious how you cut your parts as they are very precise and so small!
Trade secret! J/K

I use a "trough" made from corian,thin 2" wide double stick tape to hold the sheet down, and cut under 3-6mm of soapy water. A soak in rubbing alcohol helps release the parts from the tape.

I have to machine around .5mm off of the bottom of the trough before each batch of parts to make it flat again.
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Old 05-29-2014, 02:46 PM   #12
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Very clever...keeps the dust down! What kind of machine do you have?
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Old 05-29-2014, 02:55 PM   #13
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Very clever...keeps the dust down! What kind of machine do you have?
Zero carbon dust

My own design machine, 25x50x7" capacity, all aluminum and steel.
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Old 05-29-2014, 03:02 PM   #14
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Cool, how about a pic?
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Old 05-29-2014, 03:06 PM   #15
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Default Re: CNC Cutting Service...

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Cool, how about a pic?
old pic before I got it running, it's changed quite a bit since then, has had a lot of upgrades... structure is still the same though.
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Old 05-29-2014, 10:12 PM   #16
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old pic before I got it running, it's changed quite a bit since then, has had a lot of upgrades... structure is still the same though.
Cool! I feel like i'm getting a taste of that shop tour I'd asked for .

Thanks for the pictures and some insight on how you hold those parts for cutting. Under water, brilliant, would not have guessed it.
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Old 05-29-2014, 11:13 PM   #17
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Quote:
Originally Posted by wsntme View Post
Cool! I feel like i'm getting a taste of that shop tour I'd asked for .

Thanks for the pictures and some insight on how you hold those parts for cutting. Under water, brilliant, would not have guessed it.
Ha! if only the shop was that clean right now

Cutting Carbon is no fun, it wears out carbide bits fast, I am lucky to get 10 minutes out of a 1mm bit, 25 minutes out of a 1.6mm bit. I can go through 15-20 bits cutting parts from a 12x12" sheet of .8mm carbon. Larger production shops use PCD coated bits, which are $$$ but last a whole lot longer.
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Old 05-29-2014, 11:28 PM   #18
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Im supprised you are eating carbide up that quick. Sounds like something is going on like maybe the water/soap mix needs more soap or a little fast on the rpm. I have had good luck with carbide lasting a long time on carbon fiber. But then again when I make them at work and use the top end carbide we have have here maybe that helps a little.
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Old 05-29-2014, 11:41 PM   #19
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wow! I had no idea that cutting these parts was that hard on the tools!

I hear ya on the cleanliness....my area is a complete disaster ATM...I don't even have a place to reassemble my 130 , every flat surface in sight is covered with parts and pieces to this or that
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Old 05-30-2014, 01:11 AM   #20
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wow! I had no idea that cutting these parts was that hard on the tools!

I hear ya on the cleanliness....my area is a complete disaster ATM...I don't even have a place to reassemble my 130 , every flat surface in sight is covered with parts and pieces to this or that
Yeah, I have piles and piles of used bits, still good for G10 and dremel work, but will snap almost instantly if I try to cut any more carbon with them. I give them away in orders from time to time.
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