Metal inserts - Carbon fiber layup

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Metal inserts - Carbon fiber layup

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Trace Elliott	Trace Elliott posted 10 Years Ago HOT Topic Details
Group: Forum Members Posts: 4, Visits: 30	Hello everyone, I'm designing a drone, and I would like to be able to bolt two plates together (rather than use an adhesive, because if something breaks, I'd prefer to be able to change the piece that broke, rather than a whole assembly). The plates would be 2-3mm thick, made by resin infusion. To that effect (bolting plates together), I'd like to put a metallic insert in the lamination, prior to the infusion. The insert would be a nut, essentially. I know you can make the plate, then drill a hole and glue the insert, but I'd rather infuse the whole thing at once, if it's possible. My question is: how do you put an insert in the fiber stack? I read everywhere that you should have pins in the mould to accurately locate the inserts, but very little info on how to blend the insert in the fiber stack. Should I spread the fibers apart? I'm thinking that won't look good Should I punch a hole through the stack? Hello fibers everywhere... Should I lay the first cloth and spread the others around the insert, and grind the first layer to reveal the insert? If you have any ideas, please do tell :-) Thank you very much!
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Hanaldo	Hanaldo posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	How thick a piece of metal are you using? I always think of sheet metal as being like 0.5 to 3mm thick, which isn't really enough for fasteners... Depends what loads the fastener sees, but the rule of thumb is you need at least 4 turns of thread for the fastener to be doing anything. I wouldn't be using anything less than 10mm.
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FLD	FLD posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 2.7K	Hanaldo (13/09/2015) How thick a piece of metal are you using? I always think of sheet metal as being like 0.5 to 3mm thick, which isn't really enough for fasteners... Depends what loads the fastener sees, but the rule of thumb is you need at least 4 turns of thread for the fastener to be doing anything. I wouldn't be using anything less than 10mm. The last one was a hard 4.5mm piece of alloy for an M4 thread. Seems to have held up OK for the last year although it's not supporting anything massive, just a small header tank.
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Metal inserts - Carbon fiber layup

Trace Elliott - 10 Years Ago

There is no set way to do it as it varies with design. ideally on a straight forward sheet you would...

Warren (Staff) - 10 Years Ago

Thanks for the tips, that's really helpful! I understand how to position the insert, what I don't...

Trace Elliott - 10 Years Ago

I should think the insert I'm the picture is fitted after. the cf would be drilled and then the...

VVS - 10 Years Ago

I have actually conducted several tests of bonding in and laminating in metal fasteners (made from...

Dravis - 10 Years Ago

In the past I've scored the surface of some small bits of sheet metal and then put that in the...

FLD - 10 Years Ago

How thick a piece of metal are you using? I always think of sheet metal as being like 0.5 to 3mm...

Hanaldo - 10 Years Ago

[quote][b]Hanaldo (13/09/2015)[/b][hr]How thick a piece of metal are you using? I always think of...

FLD - 10 Years Ago

Well .. thickness of the metal insert with relation to the strength of the fastening depends...

Dravis - 10 Years Ago

Apart from when ive been laying up prepreg tooling ive never put inserts into the laminate stack....

scottracing - 10 Years Ago

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