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Author: Subject: Speedo magnet attachment
Bigboystoys

posted on 28/3/18 at 06:26 PM Reply With Quote
Speedo magnet attachment

Evening all, I seem to keep loosing magnets due to centrifugal force even when glued. How and with what are people bonding their Speedo magnets to the prop flanges?
Thanks Sam

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roadrunner

posted on 28/3/18 at 09:35 PM Reply With Quote
I used Araldite. Its still there after 8 year's.
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daviep

posted on 28/3/18 at 09:50 PM Reply With Quote
The big question is "does the centrifugal force really exist?"





A truly great library contains something in it to offend everyone.

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russbost

posted on 29/3/18 at 07:15 AM Reply With Quote
The absolutely most important thing is to ensure a spotlessly clean surface to glue it to, clean off with something like meths or thinners, NOT petrol, paraffin or white spirit as all leave an oily deposit. You can also drill a few mm into the surface (won't affect balance - at least less than sticking a magnet on without drilling!) so the glue can adhere up the sides as well as on the base.

I use JB weld, but any epoxy type adhesive should work as should anything like Siraflex or Tigerseal, but those take at least 24 hours to fully cure, I've never had a magnet come off as yet





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CosKev3

posted on 29/3/18 at 08:31 AM Reply With Quote
As above cleaning the surface is the main thing to get right.
If the metal is really smooth once degreased etc key the surface with a flap disc or summat

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nick205

posted on 29/3/18 at 08:34 AM Reply With Quote
I used a two part adhesive to glue two magnets on the edge of the flange at the diff end of my Sierra prop. They never came off.

I made sure the magnets and flange surface were very clean before gluing.

If yours are coming off could you not use some carefully positioned cable ties around them to help secure them (make sure the clip bits of the ties won't hit the sensor)?

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JMW

posted on 29/3/18 at 09:20 AM Reply With Quote
quote:
Originally posted by daviep
The big question is "does the centrifugal force really exist?"


OK, I'll bite. No it doesn't. But centripetal does.

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907

posted on 29/3/18 at 09:27 AM Reply With Quote
quote:
Originally posted by JMW
quote:
Originally posted by daviep
The big question is "does the centrifugal force really exist?"


OK, I'll bite. No it doesn't. But centripetal does.




Is this about standing on a fairground ride while having a pee?





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mcerd1

posted on 29/3/18 at 09:27 AM Reply With Quote
a above you can make magnets stick, but the HAL effect sensors that read the bolt heads is the other option if you get fedup with the magnets

https://www.etbinstruments.com/index.php?route=product/product&path=99_110&product_id=56





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907

posted on 29/3/18 at 09:31 AM Reply With Quote
quote:
Originally posted by 907
quote:
Originally posted by JMW
quote:
Originally posted by daviep
The big question is "does the centrifugal force really exist?"


OK, I'll bite. No it doesn't. But centripetal does.




Is this about standing on a fairground ride while having a pee?





Sorry. Just looked that up. That's centrapeedal.





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Bigboystoys

posted on 29/3/18 at 11:42 AM Reply With Quote
Thanks for solutions will have a play this weekend
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