Re: [PSUBS-MAILIST] Bad Day.

[MerlinSub@t-online.de]

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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