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Yes , stop and tomorrow a
better day. Also option 2 . You can close
the hole by welding or weld a stud bolt on that place . Good luck, Emile Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens James Frankland 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. No virus found in this incoming message. No virus found in this outgoing message. |