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Earthing Aluminium Extrusion?

Posted by WesBrooks 
Earthing Aluminium Extrusion?
December 14, 2017 03:23AM
Hi All,

I'm looking at earth bonding my machine to save any potential H&S and compliance issues and as an electrical noise control measure.

Aluminium is a bugger for oxidising fast and making poor electrical connections.

What would people recommend? I'm thinking tap, and sand/grind back the anodising around the hole brass screw and star lock washer to bite in a bit?

I'm planning to bond what I can back to a single point including the stepper motor bodies. Thankfully they're static on a core-xy! Y-axis gantry and hot end could be a pain to deal with. I think a bit of braiding shoved in the clamp on the cold end of the hot end will be enough. Better than nothing I guess!

Edit: All earth bonding will be man enough to take enough current to blow the fuse on the outlet of the heaters and stepper PSU.

Edited 3 time(s). Last edit at 12/14/2017 03:25AM by WesBrooks.
Re: Earthing Aluminium Extrusion?
December 14, 2017 05:25AM
... I'm using a notched(?) washer under a normal washer to cut through the oxide layer ...

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Re: Earthing Aluminium Extrusion?
December 14, 2017 05:36AM
Yeah having imaged searched that's what I meant! :-D
Re: Earthing Aluminium Extrusion?
January 21, 2018 06:50AM
That ?

Edited 1 time(s). Last edit at 01/21/2018 07:19AM by PRZ.


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