drilling/boring a very long hole?

Gallery, Projects and General > How do I??

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Fergus OMore:
The classic way to drill is to use a silver steel( that's key steel) and make a 'D' bit end. It is then tempered light straw and this will do exactly what a gun drill will do- but more slowly.

Ask yourself a question of 'How did all these bagpipe makers make their instruments'? In fact, all the parallel borings of less than 1/8th were done this way- and into far more awkward hardwood with grain etc.

The work was done on far less sophisticated lathes than you possess. Many of the makers were shepherds working after a long, long day with no more than kniitting needles borrowed from their wives.

OK, let's come to your problem and make it a bit easier and the modus operandi is more or less as follows.

1. The bar is held at the chuck end in a 3 or 4 jaw chuck.
2. the working end is held in a steady. If the work is not round, you will have to make a cat head to fit the steady.
3. the end is centred with a centre drill
4. The tail stock poppet/barrel is removed and replaced with a bored out steady just over the 1/8th.
5, the D bit has a flat at the free end to take a tap wrench/or similar holder.
7, the real work of carefully drilling can now start and before the D bit flat is full of swarf, it is removed, cleared and the boring commences and is repeated until the lot is done.

If you dont know what a D bit is, it is merely a halved end -perhaps half an inch deep but the end is left -0.065" thick and the cutting end about 5 degrees.

75Plus:

--- Quote from: loply on November 18, 2011, 07:22:34 AM ---
The bushes should keep it on-track once it's entered the hole drilled by the thing.

--- End quote ---

It is absolutely imperative that the hole is started accurately .

Once the drill is inside the hole no amount of bushings will have any effect on how true the hole will be.

Joe

Fergus OMore:

--- Quote from: 75Plus on November 19, 2011, 12:21:26 PM ---
--- Quote from: loply on November 18, 2011, 07:22:34 AM ---
The bushes should keep it on-track once it's entered the hole drilled by the thing.

--- End quote ---

It is absolutely imperative that the hole is started accurately .

Once the drill is inside the hole no amount of bushings will have any effect on how true the hole will be.

Joe

--- End quote ---

This why I stated the use of the cat's head , the centre drilling and the slow, steady drilling.

I think that Joe and I have 'been there'

jim:
http://www.cromwell.co.uk/quicksearch?search=shr-024-2101m&x=0&y=0

not that dear!

AdeV:
Unfortunately, the OP requires a 1/8" x 24" (600mm ish), the longest I saw was 315mm...

Although they don't go up to 5/8" x 600 (the size I got), based on their prices I wasn't ripped off (which is nice).

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