Carbon fiber
Hi guys and gals, that is if we have any gals.
I have a question and don't know where to put it. Moderators do your duty!
I read somewhere about an incompatibality of using carbon fiber and stainless or aluminum. I can't spell the word but it is kinda like electrolytic??? I think this means that the use of these materials together kinda makes a battery or something like that. Anyone know what I am talking about or where to find the info?
Mike
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No greater love can a man have than this, that he give his life for a friend.
Well I wouldn't call that an incompatibility.
I use them togheter in my Radio Control Helicopters and the only safety measurement I follow to avoid interferences with my PCM receiver is to make sure mass is continuous and common to all pieces in the chassis.
10+ years flying carbon helis with no problems.
Cheers,
Antonio
PS.- Apologies for my english.
Turmite -
Righto - You need to be "relatively" cautious where you use carbon fiber. Example - if you put it in close contact with stainless steel, and subject them both to salt water immersion - you'll wind up with a good opportunity to create a battery. The current flow is small, and the potential not enough to run your cd player. BUT you will slowly reduce the stainless steel as a result of "electrolysis" or "galvanic reaction" resulting from the presence of disimilar metals in a saline solution.
The challenge in boat building (racing in particular) is getting the weights down and the strengths up while keeping the "normal" metals in one piece. Electrolysis not only works in direct contact - but also THROUGH seawater - so if you expose an un protected piece of stainless to CF underwater - the same thing happens to the prop - the shaft, etc. Bronze is used underwater as a sacraficial anode to prevent the ss from melting away.
Long winded - but a passion of mine - especially since there are soooo many good places to gain the savings and strength with CF - but gotta do it smart! Hope that helps - I can send some more on the electrolysis if you need - PM is OK.
Cheers - JIm
Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it.
Thanks guys/
Jim this is kinda what I was wanting but I have no intention of immersing a carbon fiber cnc in salt water!
Mike
edited to add:
ps the only steel I plan other than maybe the rails and such is the 4th and 5th axis head. Like I said it will be small.
No greater love can a man have than this, that he give his life for a friend.
turmite - Mike -
Since you won't be submerging the machine - well maybe some coolant? - you'll lower any risk of galvanic action. BUT you'll want to insulate the honeycomb from the CF to totally elminate any possibility. You'll have the potential for a battery if you ever need one!
If you're laying up a panel, using the honeycomb as core - then a layer or 2 of of polyester glass and resin then the cf should do it - I'd think...A layer over the cf of some "finishing cloth" would seal in the cf too and let the "look" print through.
A mini -5 axis - WAAAY cool - I'm working out a desktop digitizer (3axis) in mini so I'm inspired by your 5 axis - eh!? Access to cf AND Al Honeycomb - aerospace surplus? I'm envious!
Cheers - Jim
Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it.
Hey moderators, I was serious about moving this if it was not in the right place, but I can't even find this place? Where is it located and how do I get there?
I had to use the link from the DIY and I am serious, I cannot see this forum anywhere?
Jim, I won't be using surplus. I live in Arkansas of the USA and it is kinda like the UK here. You can't find anything you need and have to have everything shipped in. The cost of the honeycomb and carbon fiber will not really be too bad considering I already use the fabric, resins and vacuum baggin system.
Mike
No greater love can a man have than this, that he give his life for a friend.
Why use Carbon Fiber? Isn't it a bit expensive?
Carbon fiber is something like 10 times as strong as the same amount of steel and bunches lighter. With the honeycomb substrate the stiffness is unbelievable. This machine is at least planned to be really small and really fast. Table will be no larger than a 16X16 in. and possible smaller than that. Fixed gantry with the articulated head. My purpose for the machine is two fold.
First I want to build it!
Mike
ps how did you find this thread. I am still having to go to the diy link to get here?
No greater love can a man have than this, that he give his life for a friend.
Ok I finally found it.
Mike
No greater love can a man have than this, that he give his life for a friend.
turmite,
This may be too late; however, you should not bond carbon to aluminium. In other words, it is a No No to bond an aluminum trim tab into a carbon composite rotor blade.
Dave J.
Hi Dave,
Nope not too late. Life took a couple more turns. I will get back to this, soon I hope.
Mike
ps thanks for the help.
No greater love can a man have than this, that he give his life for a friend.
Hello Turmite,
Any chance you finished building your 5 axis CNC using Carbon Fiber? I would love to see a picture, if you have one or two to share.
I recently made a 3 axis CNC using MDF. I'm not sure if it's the best type of material for a CNC, but the price was affordable.
Savich.
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