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Hello All.
Thanks for the advice. I like Carstens idea
best. "Scrap it and build a bigger boat". I will start
tomorrow.
But today, i think i might try and fix the
port.
There definitly is not any remains of the broken drill in
there. The broken end eventually came out in one complete
piece.
So, i think i will heat it to red hot. Weld it
closed, let it cool slowly and then file it flat. I cant get it back on
the lathe without a lot of hastle.
Once ive done that. i will try and drill it again in the
right place.
I will let you know how it goes later today and take some
pictures so you can see the disaster.....
Right, im off to get on with it.....
James
----- Original Message -----
Sent: Sunday, January 27, 2008 2:27
AM
Subject: RE: [PSUBS-MAILIST] Bad
Day.
James,
There are some small diamond core drilling bits that
I use for drilling stone, but I was thinking they might work for your problem.
I use a drill press and a large syringe filled with water to keep a steady
stream of water on the cutting surfaces to cool it and remove the
particulates. If that works, then if the hole is not to large, proceed
as planned. If the hole is to large then I like the idea of welding it shut
and redrilling the hole to the exact size you want. If you can't
reasonably remove the bit tip, then I would go Emile's route. "Also option 2 . You can close the hole by welding
or weld a stud bolt on that place ."
Carsten,
The North Idaho way would be to
make big hole with the blue tipped saw, then pound in a wood plug, then hold
the ring on with a sheet rock screw and a couple of fender washers. But we
would be sorely temped to use duct tape on any given Monday. ;
)'
Cheers,
Brent
Hartwig
> From:
nparmley@suddenlink.net
> To: personal_submersibles@psubs.org
>
Subject: Re: [PSUBS-MAILIST] Bad Day.
> Date: Sat, 26 Jan 2008 17:42:00
-0800
>
> Carsten,
> I take offense to number 3! We would
use duct tape!
>
> Regards,
> Norm P
>
> -----
Original Message -----
> From: <MerlinSub@t-online.de>
>
To: <personal_submersibles@psubs.org>
> Sent: Saturday, January
26, 2008 2:44 PM
> Subject: Re: [PSUBS-MAILIST] Bad Day.
>
>
>
> Hi Submadman..
> Nothing to rescue - scrap
the boat and build a bigger one..
>
> just joking..
>
> Hmm.. seems still hard remain of the broken drill are in ?
>
> But I have sometimes the same on stainlees steel - a spot in the
material
> realy hard - may to much chrome or nickel or something
there.
>
> 01) German solution
> Purchase a new
porthole
>
> 02) Dutch solution
> Drill the hole from the
other side - the inside.. until you get a complete
> hole.
>
Later close this inside - half way with a tread and a bolt.
> Make the
bolt complete into - may some 2 mm deeper than the hole surface,
>
overweld the bolt - grind or mill the weld away..
> Looks like new and
works.
>
> 03) Italian solution
> Fill the hole with epoxy.
Make a very short bold with a tread only in the
> outside retainer ring
- so it looks like a complete bold - but is just the
> head for
show.
> Looks like new - and the other 5/7/9 bolts will work.
>
> 04) US solution
> Simillar to 03) but don't tread the bold head
- just glue it instead for
> show..
>
> still some
jokes..
>
> best regards Carsten
>
>
>
> "James Frankland" <james@guernseysubmarine.com>
schrieb:
> > Hi All.
> >
> > I just had one of
those days where everything goes wrong.
> >
> > Im cut,
burned and i got a splinter in my eye despite wearing my safety
> >
glasses.
> >
> > Anyway, i have a problem which maybe
someone can help me with.
> >
> > I was trying to get my
viewports complete and welded into the tower today.
> > But, one fo
the holes went really wrong.
> >
> > I am drilling and
tapping the holes in the viewports. I have done 29
> > holes and
everything seemed straight forward.
> >
> > But, on one of
the holes, the pilot drill broke right at the start. It
> > took me
over an hour to get the broken piece out. After that, i tried to
> >
drill it with a new bit but it just wont drill. When i say it wont
>
> drill, i mean it really wont drill. I went to the shop and bought some
> > special bits designed for stainless steel and even that wont get
though
> > it. Its like trying to drill a diamond. I dont know what
has happened
> > here. It seems such a simple job, but i'm really
stumped.
> >
> > I have gone through about 6 brand new bits
of different sizes and types
> > but all ive done is make a
mess.
> >
> > The hole is now about only 5mm deep and larger
than needed. I think i may
> > have to drill and tap it to the next
size up if i can even get through it.
> >
> > Does anyone
know what has happaned? The steel is A516 GR70. I was using
> > a
drill press on slow speed. All the others holes were good with a long
>
> trail of swarf indicating a clean cut.
> >
> > Perhaps
its a "hard bit" on the steel? Does this happen?
> >
> > Or,
maybe it has work hardened and i now cant get through it?
> >
>
> I thought of a couple of options.
> >
> > 1. Heat it to
red hot and try drilling it.
> >
> > 2. Drill another hole
next to it and fill the mistake with something,
> > maybe
epoxy?
> >
> > 3. Scrap it and make it again. (very
bad)
> >
> >
> > I had enough ports done to weld
into the tower, but i thought i better
> > stop today. I was so
misserable i would probably make things even worse.
> >
> >
I may take the port to a professional shop to try and rescue it, but im
> > not sure what they can do that i cant.
> >
> >
Any ideas anyone?
> >
> > Many thanks as always
> >
James.
> >
> >
> >
> >
>
>
>
>
>
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