|Re: HP 41c . don't touch if you don't know|
Message #10 Posted by geoff quickfall on 16 Dec 2010, 6:15 p.m.,
in response to message #9 by aurelio
Looks good so far, did you manage to introduced shaved plastic to the posts.
The glue (sparce amount) is to repair the crack and the shavings introduce new plastic into the tube to replace the plastic removed as the screw stripped the threads.
Make sure you let it dry completely as it looks like there is a liberal amount of glue in each post.
When dry. Just barely screw in a screw with the silicon tubing in place. Then, with a soldering iron (takes a few seconds for the soldering iron to warm the screw), warm the screw. Do not heat the screw so it melts the post, but just enough to soften your glue/heat shaving mixture. Then while the screw is hot, and applying slight downward pressure as you turn it. Screw it into the post about half the length of the screw. Let everything cool, then remove the screw. It will now be set for use with the case back.
1 clamp the post with the tubing
2 add glue and shavings.
3 with tubing in place,
a gently warm the screw (not hot).
b place the warm crew tip in the post and screw it half way.
c this has the effect of tapping (adding threads) the post.
4 let cool.
5 remove screw.
6 let assembly sit and cure completely.
7 remove silicon. (if it sticks, use a razor blade to remove it.
It is essential that the post be completely cured before you tighten the screws. To tighten the screws:
1 place the screw in position.
2 reverse the screw direction (unscrew) until you feel the screw
seat in the threads.
3 screw in the tightening direction.
4 screw until it just stops and maybe 1/8th of a turn more.
Edited: 16 Dec 2010, 6:17 p.m.