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Beatnik

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Reply with quote  #16 
Quote:
Originally Posted by MJ
We found acrylic adhesives like Loctite Speedbonder 325 and Hernon React 730 to be almost as good as CA in terms of limiting HF attenuation (up to 16KHz).  Both of these use an acetone based catalyst, which is flammable.  TSA will not allow acetone as carry-on luggage, and it is a lottery whether they will remove it from checked luggage.  For this reason, we settled on Loctite 325 with an optional solventless activator (part#:7380) that UPS will ship and TSA will leave alone.  If doing a test, I would encourage including either Loctite, Hernon, or some other acrylic adhesive.


Thanks a lot!

As someone who also use a 2 step acrylic (loctite AA312 + 736 Primer), knowing this makes me very happy.
RustyCas

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Reply with quote  #17 
I use Loctite Depend 330 almost exclusively for permanent mounts. For temporary mounts I use HBM strain gauge cement, which I learned about from Art Crawford. I would think that any type of adhesive mount would be superior to just a magnet.
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Barry

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Reply with quote  #18 
Lord 409
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Curran919

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Reply with quote  #19 
Quote:
Originally Posted by MJ

 In conclusion, here are my recommendations if mounting pads on steel bearing housings: If doing a one-off test, use CA.  If you want a super rigid bond that will last in excess of 25 years, use acrylic.  If you want to spend time precisely mixing parts A & B, dealing with waste disposal, and live with more HF attenuation than CA or A, then use epoxy.  If mounting a pad to concrete, I suspect epoxy would be better as it can fill voids and maintain full strength.

I hope that you can share the results of your shaker test with the group.


I very much appreciate this great answer! It is extremely useful.

My work in troubleshooting almost never requires temporary permanent mounting, so its reassuring that I can continue to rely on cyanoacrylate.

I will try to get around to this test during our summer slow-down.
P Hine

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Reply with quote  #20 
+1 on the Locktite 330
ruben

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Reply with quote  #21 
[QUOTE = Barry] Lord 409 [/ QUOTE]

Hi, Barry

How much time the LORD 409 need to attach hard?
Barry

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Reply with quote  #22 
I have been retired for a little over 10 years and my grey matter database is getting harder and harder to reboot so the best I can remember 30 minutes. I used the mixing tubes so there was inherent wasting of the product if only one or two pads were installed. The thing I liked about the product was it only required you to hold it 30 to 40 seconds for it to stand on its own.
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