Ok do this loctite sum with me

[simonfraser]

Loctite 648

Round a metal pin 80mm diameter, 50mm length
Tight fit into a metal hollow space

What’s the shear / pull out strength according to the calc / data sheet ?
https://tdsna.henkel.com/NA/UT/HNAUTTDS.nsf/web/1716575D28E43176882571870000D860/$File/648-EN.pdf

No thread drift as to weather this is a great idea or not

 

[kashurst]

subject to cure time,quality of application, quality of fit etc etc
sheer strength after 24 hours is => 25N/mm2 (seriously strong stuff!)

your bearing is 80mm diameter x 50mm deep
contact area = 3.142 X 80 x 50
= 12568 mm2

sheer strength to pull the bearing out would be 25 x 12568 Newtons = 314200 N
which is about 30 tonnes weight pulling on it. (unless I have mixed up my units somewhere)
can some else verify/correct this?

 

[BruceK]

Those figures sound impressive. I used it in an emergency to lock the cone and bolt on my duoprops on after replacing props last year when one fell off. Was it hard to undo the cones and bolts afterwards. Not at all. I think there is more too it than sums.

 

[kashurst]

Those figures sound impressive. I used it in an emergency to lock the cone and bolt on my duoprops on after replacing props last year when one fell off. Was it hard to undo the cones and bolts afterwards. Not at all. I think there is more too it than sums.

yes and no - the bolt holding the last prop and the cone on the outdrive is an M8 possibly M10 - with any loctite you probably wouldn't feel it plus its been sitting in sea water which is nasty stuff (see data sheet re chlorine etc, no specifics given for sea water)
imagine the same loctite on a bolt 3 1/2 inch in diameter, stored in air.

 

[simonfraser]

subject to cure time,quality of application, quality of fit etc etc
sheer strength after 24 hours is => 25N/mm2 (seriously strong stuff!)

your bearing is 80mm diameter x 50mm deep
contact area = 3.142 X 80 x 50
= 12568 mm2

sheer strength to pull the bearing out would be 25 x 12568 Newtons = 314200 N
which is about 30 tonnes weight pulling on it. (unless I have mixed up my units somewhere)
can some else verify/correct this?

yeh i came up with similar numbers using google, which surprised me, hence the thread.

the effect if seawater is an interesting one, dunno will have to google that one.
i flush the affected area after a dunking, and it did not fall off this weekend)

 

[jon and michie]

Those figures sound impressive. I used it in an emergency to lock the cone and bolt on my duoprops on after replacing props last year when one fell off. Was it hard to undo the cones and bolts afterwards. Not at all. I think there is more too it than sums.

On a dry bolt when torqueing up only 10% of applied torque efforts results in useful bolt load - 50%is lost in overcoming nut face friction and 40%is wasted between nut and bolt thread friction.
when using any sort of liquid be it locktite or molykote paste on threads you have to factor the coeffient value into it as friction is lost so any torque value has to be calculated if for the nose cone it is 70 to 80 n/m you would have to propbably increase the torque wrench settings up to achieve the correct torque.
Hope this makes sense.
The op is I think is just pushing a bearing into its seating which doesnt have a thread therefore only "glueing it in place".

jon