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Which thread insert for a cast enclosure?
Which thread insert for a cast enclosure?
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Old 7th January 2020, 10:04 AM   #1
amundsen is offline amundsen  Belgium
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Question Which thread insert for a cast enclosure?

Hello,


I am currently designing a small speaker to be set on a microphone stand. The enclosure will probably be cast in a special concrete-like material stuffed with some fibres to make it lighter.


I'm not sure how to design the location on the enclosure that will be screwed on the stand. Solutions currently encompassed are:
- a thread insert made to be hammered in wood like this one
- another type of thread insert, maybe better for a cast but I have doubts about the mechanical resistance
- a thread insert with a plate, to be itself screwed into the enclosure (bigger footprint)
- a hole with a shape adapted to a nut (easiest solution for a cast probably)


What do you think?
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Old 7th January 2020, 10:19 AM   #2
OlegSh is online now OlegSh
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Location: Germany
Which thread insert for a cast enclosure?
I would simply cast in a flange nut. The nut should be cast in closer to the inner surface of the enclosure where the flange goes inside of the compound. The flange will keep the nut always in the compound and also add more surface so the enclosure does not crack when tight mounting it to the stand.

Regards,
Oleg
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Old 7th January 2020, 10:23 AM   #3
amundsen is offline amundsen  Belgium
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Good idea! I could even find ones with a 3/8 thread for a reasonable price. Thank you OlegSh.
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Old 7th January 2020, 10:26 AM   #4
justanalogue is offline justanalogue  Netherlands
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I would use this one 219 Thread adapter | Konig & Meyer

Get a plate with 1/2 UNC thread for the inside and cast around that.

Kind regards,

Willem.
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Old 7th January 2020, 10:50 AM   #5
amundsen is offline amundsen  Belgium
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Quote:
Originally Posted by justanalogue View Post
Get a plate with 1/2 UNC thread for the inside and cast around that.
Do you mean a plate of the same kind as this one?
Quote:
Originally Posted by amundsen View Post
- a thread insert with a plate, to be itself screwed into the enclosure (bigger footprint)
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Old 7th January 2020, 10:53 AM   #6
justanalogue is offline justanalogue  Netherlands
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No just a piece of metal with an 1/2"UNC thread in it, like a square or round plate.
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Old 8th January 2020, 10:19 PM   #7
phase is offline phase  United States
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Concrete takes compression forces well, but not other types of loads.
I would tend to sandwich two plates together using bolts, and a rubber gasket on each side against the concrete material.
Cool project it sounds like.
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Old 15th January 2020, 08:46 AM   #8
amundsen is offline amundsen  Belgium
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Quote:
Originally Posted by justanalogue View Post
No just a piece of metal with an 1/2"UNC thread in it, like a square or round plate.
Something like this?

Click the image to open in full size.

Quote:
Originally Posted by phase View Post
I would tend to sandwich two plates together using bolts, and a rubber gasket on each side against the concrete material
Please tell me if the representation in the attached diagram is correct (sorry, couldn't make it appear directly, don't know why). So, the metal places are sandwiched only. There's no other tie between them and the thread insert?

Quote:
Originally Posted by phase View Post
Cool project it sounds like.
Thank you!
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File Type: png insert béton plaques métal V1.png (52.9 KB, 51 views)
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Old 17th January 2020, 03:36 AM   #9
phase is offline phase  United States
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That’s it.
Cast in pickup points are problematic, tend to spin inside, unless they are huge.

Last edited by phase; 17th January 2020 at 03:43 AM.
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