drilling deep holes

Most of the body of the gun drill is made from tube that has had a right angle shaped dent rolled along it. Only the head is solid. The head and holder ends are brazed on to the tubular bit.

Mark Rand RTFM

So was that the right answer?

Regards, Tony

It's a very simple anagram for those of who frequent rec.puzzles.crosswords and like to have an anagram sig.

Camp USA Engineer = the anagram fodder Minces about = the anagram indicator, which plays on the 'camp' theme High performance specialist = me (Puma Race Engines)

-- Dave Baker Puma Race Engines

Camp USA engineer minces about for high performance specialist (4,4,7)

Aha...the version I was looking at was different - "Camp American engineer minces about for high performance specialist (4,4,7)" which needed another step (American => USA, which isn't always the case anyway - viz Canada, Brazil...)

Makes perfect sense now...

Regards, Tony

"Camp USA Engineer "is an anagram (minced about)

A racing specialist is Puma Race Engines

4,4 7 ....I can't think

It's probably an enginious solutio

-- rss

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Presumeably you need to use a live centre to do that, otherwise wouldn't the friction at the headstock end is offset by that at the tailstock ? Interesting tip in any case, thanks.

I've got a live centre with interchangeable heads and one of them has head that's a 50(ish) mm disc with holes and engraved circles - often wondered what that was for, now I think you've told me.

Cheers,

Hrmph, smacks of cheating to me.

:-)

Instead of winding the tailstock barrel back slacken the tailstock an

slide that back on the lathe bed, when swarf clears from drill slid back into job continue drilling much quicker than screwing barre back. MB

-- malbenbu

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Even quicker to drill from the Toolpost ;) Easier to control depth too.

Wayne...

On or around 23 Nov 2006 04:18:47 -0800, " snipped-for-privacy@ems-fife.co.uk" enlightened us thusly:

tried that to start with, it's better the other way round - drilling 8 down the middle first makes a pilot for all the others - that way each operation after the 8mm hole is only removing a light cut (0.5mm, ish) and so each operation is fast. doing it the other way would solve the problem of the deep hole, true, but the successive holes drills would all be removing full-width material, which is slower.

On or around Sun, 26 Nov 2006 17:22:00 GMT, Wayne Weedon enlightened us thusly:

more hassle holding the chuck though, and more hassle centering the drill. The tailstock is nominally on the same centreline as the chuck. If I wanted

57 holes the same size in 57 bits of material, It'd be worth inventing a way of doing it.

Depends if hassle setting up is more or less than shagging out a drill ;)

If you have something like a boring bar holder with a vee groove then it's a couple of minutes to setup on centre. You don't need a drill chuck.

Dickson toolposts can take a toolholder with a morse taper though.

The thing about peck drilling is the drill has to be retracted fast, thats not really possible with the tailstock barrel.