wrote in message
...
On Fri, 12 Dec 2008 10:59:53 -0800, "Capt. JG"
wrote:

wrote in message
. ..
On Thu, 11 Dec 2008 18:50:26 -0800 (PST), joost
wrote:

I am investigating the best way to fasten a 4 metre long alu t-track
for my whisker/spi pole to the alu mast.

Currently I have a short length of track (1 metre) which is fastened
with SS screws. I am not satisfied with this, because the screws react
with the aluminium of the mast and dissolve the thread. The track
comes off. I also find it quite difficult to drill and tap the holes
in the mast accurately sitting in a bosun's chair.

My question is whether it would be better to fasten the track with SS
rivets dipped in some isolating compound. At least I wouldn't have the
problem of the tiny threads corroding away and loosening the
fasteners. Also I think that I have a bit more tolerance for drilling
the holes + I can reuse the existing worn out holes to put the rivets
in (instead of tapping one size up).

But, how strong is it compared to screws?

And, how would I go with off-the-shelf T-track which is made for
countersunk heads?

Any thoughts?

Thanks,
Joost.

Next time, tap the holes to make threads for machine screws. Mount
using SS machine screws coated with TefGel.



Wouldn't stainless promote a galvanic response between the screws and the
two pieces of aluminum?

No. That's what the TefGel eliminates.



Heh... I guess I should have paid more attention. LOL


--
"j" ganz @@
www.sailnow.com