"BobK207" wrote in message
ups.com...
On Jun 24, 8:27 pm, Joe wrote:
On Jun 24, 10:06 pm, "MiamiCuse" wrote:
"BobK207" wrote in message
roups.com...
On Jun 23, 8:22 am, wrote:
On Jun 22, 10:45 pm, wrote:
On Fri, 22 Jun 2007 23:41:30 -0400, wrote:
It is most important that keep the drill centered. Guide the
drill at
an angle until you get hole in the right location and then slowly
straighten the drill. Do not break the drill. Drill the screw all
the
way through.
If you think loctite may have been used then heat the area until
smoke
shows the loctite burning.
When cool insert the extractor and tap downward to make the tool
grab.
This should remove it if you kept the drill centered.
If not drill the hole through with a root diameter drill as long
as
you can keep it centered. If you can Re-Tap.
If this still fails then purchase a thread insert and follow the
directions.
Best thread insert : Gardserts
http://www.gardspecialists.com/-Hidequotedtext -
- Show quoted text -
I've can't imagine how you could use a screw extractor on a 10-32
screw to begin with. I've never seen one that's small enough to be
used on a screw that small.
I've used screw extractors on screws as small as #6's.....but its
usually a 50-50 success rate even on the bigger ones.
IMO you need good quality extractors...I have a set of Hanson's that
has extractors for even smaller screws.
http://www.mytoolstore.com/hanson/extractr.html
The trick is to drill down the centerline of the screw, drill the
right size hole......too big & the screw extractor tends to expand
the
screw & lock in the hole....too small & you won't get a good bite on
the screw
a brass screw is pretty soft so the extractor might chew it up rather
than bite & extract.
MC, if you've got through hole you might be able to drill with
successively bigger drill until on the threads of the screw are left
&
then you can pick at the screw & maybe unwind the thread.
If the hole's not too badly messed up you might be able to chase the
threads & re-use the hole as is...otherwise bump up to the next size
(#12) or do a hole repair with a Heli-coil
cheers
Bob
Thanks Bob. I have drilled it all the way through and inserted the
screw
extractor and no good it won't bite. I then took a dremel with a cut
off
wheel to cut a deeper slot and tried again - it turned ... but bad
news, the
screw head came off and the rest of the screw is still inside the hole
and
none of it is protruding from the hole for me to get with a plier.
So now I have a short screw inside the hole, I guess I need to use a
bigger
drill bit but I think more than likely I will damage the thread of the
hole
since I don't trust myself to be able to drill totally straight and
centered. I have about 7 screws that are refusing to be extracted out
of
16.
MC
Did you read my earlier post? I know from years doing mechanical work
that stubborn screws can be easily removed with an IMPACT DRIVER (not
an air impact wrench). This is a simple tool that works with another
simple tool, a hammer. Nearly 99% of professional mechanics will have
one in their toolbox, but the general public and every one of your
post responders seems to be blissfully unaware of this essential and
low cost device. For under $10 you can likely solve your problem, $15
if you need a hammer, and if it doesn't work due to corrosion or some
other mechanical mishap you can then do a drill out and Helicoil
routine knowing that the situation was hopeless to begin with. Good
luck.
Joe
Joe-
Just because some of us didn't suggest an impact driver doesn't mean
we don't know of their existence or their usefulness. .... I have one
but don't think it is the solution in this situation. Of couse I'm
not standing next to the screws in question..
Brass screw, 10-32
IMO doesn't seem like a good candidate for the impact driver
treatment.....................
MC-
Failing screw extraction I'd opt for successive drilling...if the hole
material is steel, it will tend to keep the drill drilling in the
brass (softer material) You can drill up close to the screw minor
diameter & then "pick" the remaining thread out.
Even a damaged threaded hole has some decent holding ability..... a
10-32 brass screw needs only about four good threads if the hole is
steel, 6 threads if the hole is brass.
A 1/2" of thread (16 threads) for a 10-32 is a bit much.....you could
have a fair amount of those threads damaged & still secure a brass
screw
cheers
Bob
Bob thank you very much for this advise. I finally tried what you suggested
to drill it successively with larger sizes. I was prepared to completely
ruining the thread. I tried one smaller size drill bit and drilled all the
way through, then inserted a replacement screw, it actually went into the
thread and turned one revolution! So I tried a bigger drill bit and drilled
again, slowly and steadily, and afterwards I tried the screw again and it
went in, with slight resistance but the threads are fine! I have to pick
out the pile of metal collected at the bottom of the hole but the original
threads are still good. Thanks again!
MC