Gallery, Projects and General > How do I??

Drilling and tapping in bronze

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9fingers:
On Friday the parcel arrived from Holland. see link at the top of the thread.
I've been very impressed with this company and the ease of ordering from them.

You email them with what you want, they send a pro-forma invoice price in Euros. You send funds to their bank quoting the ref no and they send the goods.
Money sent Monday, good delivered Friday the same week - result.

I decided to hold the nuts in a 4 jaw chuck clamped to the mill table.



The idea being to hold the round nut as securely as I could.

I used a sturdy (BS5) centre drill to mark the four locations for the drill. I used a 4.2mm pilot drill. A new cobalt drill (because I had some to hand) with the lips knocked off with a couple of strokes of a diamond file. I did not have a new 5mm drill but chose the best I had.

Using the knee to apply the feed with the quill locked off worked brilliantly and I soon  had four holes 20mm deep with no snags. The swarf was typical brass type - fine needles and no curls. Just little bit of a squeal as the 5mm drill bottomed but no snatching and everything stayed cold.



Tapping was a breeze with a three flute straight taper tap. First time round I used a little trefolex compound but did the rest dry as it was cleaner. Finished off with a bottoming tap - did not bother with a second tap

Usual back support to the tap wrench driven by hand - not feeling brave enough to tap under power.



I soon had all four done with no breakages - pleased and relieved.





Thanks for all the hints and I hope the thread might help others in the future.

Cheers

Bob

awemawson:
Excellent Bob, glad it turned out well in the end  :thumbup:

9fingers:

--- Quote from: awemawson on January 16, 2016, 01:26:47 PM ---Excellent Bob, glad it turned out well in the end  :thumbup:

--- End quote ---

I think the secret was not not let the machine see the fear in my eyes!!

Bob

awemawson:
 :lol: :lol: :lol: :lol: :bugeye: :zap: :bugeye: :lol: :lol: :lol: :lol:

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