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Tips for mount toroidal transformer
Tips for mount toroidal transformer
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Old 19th November 2019, 09:14 PM   #1
spoontex is offline spoontex  Spain
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Default Tips for mount toroidal transformer

Hello,


can you tell me, how you do mount toroidal transformers into a rack enclosure?


I know, with the bolt, rubber pads and steel washer. But, for do it this way I need to drill the chassis and the bolt has a big head, and If you mount the rack into cabinet with other devices, this will be a problem with the bolt.



Any advice?


Thanks!!
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Old 19th November 2019, 09:17 PM   #2
ubergeeknz is offline ubergeeknz  New Zealand
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A bracket from a side or front/back of the enclosure? Or a countersunk bolt if the base is thick enough to accommodate (nut fastened inside)
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Old 19th November 2019, 09:31 PM   #3
levistubby is offline levistubby  United Kingdom
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A countersunk rivnut in the bottom of the case.
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Old 19th November 2019, 09:41 PM   #4
rayma is online now rayma  United States
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Mount the toroid on a square plate, then mount the plate on 4 spacers to the chassis bottom.
Spacers should be higher than the toroid's bolt head.

Last edited by rayma; 19th November 2019 at 10:02 PM.
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Old 19th November 2019, 10:16 PM   #5
Chris Daly is offline Chris Daly  Australia
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With mounting toroidal hardware, two large rubber washers, two circular plates and a central bolt nut and spring washer is usually provided.

Although most would consider this as job done, you need to also source a insulation washer that includes the central bolt thread, to isolate chassis ground from the central bolt. This is rarely provided - along with sufficient thread length to do the job properly. See creepage and clearance Electrical Safety Requirements

Another precaution rarely observed, is caution when using toroidals particularly small ones in circuits with very little current draw, as flux density is greatest with no load.

Transformers Part 1 - Beginners' Guide to Electronics

Last edited by Chris Daly; 19th November 2019 at 10:30 PM.
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Old 20th November 2019, 08:44 AM   #6
spoontex is offline spoontex  Spain
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This articles are amazing!! Thank you very much.
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Old 20th November 2019, 11:01 PM   #7
PRR is offline PRR  United States
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From the other forum:
> It's possible to upload some photos?

Of what? A dimple? A wrench socket? A bolt?

The "big money" is in tapered dimples. Lots of tapered dimple-dies for that job.

You only need a flat dimple bigger than your bolt+wrench, deeper than your bolt head, and nobody will see it. You can do a respectable job with two sockets and bolt or hammer. (You can even use a round rock on sand, but it takes a steady hand.)
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Old 22nd November 2019, 09:48 AM   #8
spoontex is offline spoontex  Spain
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Thank you very much.


I will try.
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Old 23rd November 2019, 09:35 AM   #9
Rick PA Stadel is offline Rick PA Stadel  United States
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You could even flatten the prongs on a 'T-nut' -- the type used inside speaker cabinets to secure a driver -- then have a relatively thin (1.5mm or so) protrusion on the outside chassis bottom.
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Old 27th November 2019, 08:36 PM   #10
spoontex is offline spoontex  Spain
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I did a kind of base with freecad and print with a 3d printer. I think it's better to countersunk M3 bolts than M6.


What do you think?


torid2 — imgbb.com


toroid — imgbb.com
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