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Old 30th May 2012, 08:42 AM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by barrymagrec View Post
Yes - make sure that it`s fitted the right way round though or it can pull out with the weight of the toroid - I`ve seen this happen after kit has been shipped imperfectly packed.
This point has been raised before.
A back to front rivet nut has very little strength.
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Old 30th May 2012, 10:14 AM   #12
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Quote:
Originally Posted by AndrewT View Post
Any conductive material will short out the transformer.
Steel is actually a bad conductor compared to aluminium. Copper and silver are even better conductors.
Carbon fibre is a bad conductor, but it will still short out the transformer.
Unless you can provide proof, this is complete horse ****.
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Old 30th May 2012, 10:15 AM   #13
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Quote:
Originally Posted by AndrewT View Post
This point has been raised before.
A back to front rivet nut has very little strength.
It has plenty for normal use when installed in reverse. Unless you have actually done it, then you don't know what you're talking about. I have, and they are plenty strong enough.
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Old 30th May 2012, 10:20 AM   #14
AndrewT is offline AndrewT  Scotland
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sort the wheat from the chaff, i.e. believe what you want.
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Old 30th May 2012, 10:27 AM   #15
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very infomative. thanks to everyone. cheers!
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Old 30th May 2012, 11:56 AM   #16
6J6 is offline 6J6  Australia
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If you aren't using a riv nut (like me), it's a good idea to insulate where the bolt passes thru the chassis, and where the nut tightens on the bottom. Nylon washers and nylon tubing over the bolt works well.

Just prevents any possibility of creating a shorted turn scenario. As the top plate and the chassis act as cheeks, and the rest is history.

6J6.
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Old 30th May 2012, 12:29 PM   #17
SY is offline SY  United States
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Quote:
Originally Posted by dirkwright View Post
Only if it's steel. It doesn't make a damn bit of difference otherwise.
Or any other conductor- the thing to avoid is an unintentional shorted turn.
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Old 30th May 2012, 05:34 PM   #18
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Originally Posted by dirkwright View Post
It has plenty for normal use when installed in reverse. Unless you have actually done it, then you don't know what you're talking about. I have, and they are plenty strong enough.
Like I say, I have seen it happen. Transformer rolling around in the case. Believe it or not - makes no odds to me.
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Old 30th May 2012, 07:25 PM   #19
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Quote:
Originally Posted by dirkwright View Post
Unless you can provide proof, this is complete horse ****.
What you call 'horse ****' is basic electrodynamics / transformer theory. Please go back to 'Start' and read the basics.

A closed conductive loop around the core (formed by the bolt and the conductive chassis) will act as a single, low-resistance turn, effectively shorting out the transformer, as AndrewT and SY stated correctly.

Andreas
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Old 30th May 2012, 08:00 PM   #20
AKN is online now AKN  Sweden
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Hi,

If one creates a shorted turn, place a shoulder washer in one end of the bolt. Problem solved
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File Type: jpg washer.jpg (48.2 KB, 158 views)
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