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  #1  
Old 23-12-17, 17:19
Gavinm Gavinm is offline
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Ali Honeycomb bobbins

Hi all

I have cut out the honeycomb for the floor that my fuel tank is going to sit on and want to make and bond in some bobbins to locate the honeycomb to the chassis and separate ones to locate the fuel tank.
My plan is to use epoxy to bond in the bobbins but could do with some info on the the materials to use, size and shape for the bobbins.

Does anyone know if there anything I can read up on to give me a steer please?

Many thanks
Gavin
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  #2  
Old 23-12-17, 18:21
salexander salexander is offline
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We had this problem with our clubmans chassis. Made up a bundle of simple aluminium top-hat bushes to prevent crushing the honeycomb. From memory, they were 10mm diameter with the top-hat something like 18 or 20mm diameter and 2mm thick. They've been used to mount the fuel tank, pumps, oil tank and a bundle of other items with no problems. In most cases didn't bother to bond them in.
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  #3  
Old 23-12-17, 20:25
Gavinm Gavinm is offline
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Did the top hats sit proud or were they countersunk into the honeycomb?

Thanks
Gavin
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  #4  
Old 23-12-17, 21:15
wombat58 wombat58 is offline
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For low loads on the honeycombe I just use rivnuts. For higher loads I use 6061 bobbins bonded with 3M EC2216.
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  #5  
Old 24-12-17, 00:28
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Nick Skidmore Nick Skidmore is offline
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Quote:
Originally Posted by Gavinm View Post
Did the top hats sit proud or were they countersunk into the honeycomb?

Thanks
Gavin
Unless the skin is quite thick (1.5mm +) and you have clearance issues then have top hats proud, no need for the 'brim' to be any thicker than the skin on the sandwich panel. The 'tall' part of the hat should be about 0.1mm shorter than the panel is thick.

Bond all bobbins, 3M Scotchweld 6323-2 or 6323 as litre packs or DP490 in small syringes.
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Old 02-01-18, 11:04
GeoffW GeoffW is offline
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Is there a source for top hat bobbins? Looked everywhere and ended up getting some custom machined for my rebuild. Should have asked on here first, I remind myself.
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  #7  
Old 02-01-18, 15:05
rmmitchell rmmitchell is offline
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Shur-lok ones are 2 part top hat type ones.

Clarendon Speciality Fasterners sell them.

Though I think there are others.
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