Gallery, Projects and General > How do I??

Drilling and tapping in bronze

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jb3cx:
I had the same problem a few years ago .spent hours machining a component made of bronz,due to the irregular shape ,and radius,all machining was don on the rotary table,6 holes had to be drilled 6 mm X 24 mm deep Center drilled ,then 3 mm drill ,then on to 6 mm ,just started to drill the 6 mm hole and the drill snatched ,the quill shot down bottoming out the drill and snapping just below the surface ,so nothing to get a purchase on to back twist it out .so off to the spark eroder,
After setting it back up on the mill .this Time I locked off the quill nice and tight and used the knee to drill the holes ,drilled all the holes ,then reamed them no problem ,after that I have always been wary drilling any brass or bronz using the quill feed ,but touch wood ,been ok since that disaster ,

SwarfnStuff:
I just read the posts so far and was going to mention using the fine feed rather than the standard quill handle as this is what I always do with brass or bronze.

   So, I agree with jb3cx when he mentions locking the quill and using the knee to feed the drill depth.

   Same method, different (way different) size in mill. Mine is Seig X2. Don't know what your mill is so whichever suits.

    Let us know how it goes.
John B

9fingers:

--- Quote from: SwarfnStuff on January 10, 2016, 12:08:48 AM ---I just read the posts so far and was going to mention using the fine feed rather than the standard quill handle as this is what I always do with brass or bronze.

   So, I agree with jb3cx when he mentions locking the quill and using the knee to feed the drill depth.

   Same method, different (way different) size in mill. Mine is Seig X2. Don't know what your mill is so whichever suits.

    Let us know how it goes.
John B

--- End quote ---

Sounds like a good tip. My mill is a Myford VMC C 1986 ish - similar to the early 6x26 models but no quill fine feed only rack and pinion feed so raising the knee which weighs over 100kg should help resist the snatching effect.

I will try one as an experiment (16 tapped holes to do, 4 in each of 4 nuts). I'll try everything suggested to avoid putting any money the way of my local tame spark eroder man.
If it goes badly I do have a fallback needing no drilling but needing an extra component to machine. If I go that route it will be easier to post a photo than describe the approach.

I should get the bronze nuts in from Holland sometime this week with luck and will report back.

Everyone's support has been great.

Thanks

Bob

awemawson:
Bob,

If you break a tap, I'll pop it out for you on my spark eroder


http://madmodder.net/index.php/topic,9319.0.html

9fingers:

--- Quote from: awemawson on January 10, 2016, 02:22:10 PM ---Bob,

If you break a tap, I'll pop it out for you on my spark eroder


http://madmodder.net/index.php/topic,9319.0.html

--- End quote ---

Thanks Andrew

Good to hear from you - hope all is ok

Bob

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