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Drone bore question

Posted: Fri Jun 13, 2014 1:08 pm
by tompipes
I've been looking at drone bore measurements lately and have noticed something with baritone drone bores.

I assumed that drone bore sections widen as they get longer and that's something I've found in the few sets that I measured and some measurements I've seen online and purchased.
But I've noticed in a few sets of measurements that the bore of some baritone drones are the same all the way along.
Notably the Hannon Coyne set. Both sections are 5.4mm in diameter. I've seen something similar in a Rowsome set too.
Is this a deliberate move by the maker or might there have been replacement parts added at a later time.

I've only made D and C half sets to date so I thought I'd ask the question before I moved to B sets.


Tommy

Re: Drone bore question

Posted: Fri Jun 13, 2014 3:36 pm
by wooff
That just has to be a mistake in measurement or, as you say a piece has been replaced.

I would suggest, for using cane drone reeds in a B set the first piece could be bored 3.6mm , or for using Elder (or something like that) then this bore could be 4mm. the second piece is ok at 5.4... both bores would have originally has some small amount of tapering.

Re: Drone bore question

Posted: Fri Jun 13, 2014 8:08 pm
by tompipes
Thanks Geoff.
I thought something was odd about that number. 3.6 seems more like it.

I find very slight tapering can occur from constant re-insertion of D bits.
Personally I use an under size D bit for reaming and then a kind of spade bit to ream to the final size, after a year or 2, which also smooths out the bore so that'd remove any tapering from the first D bit. Mind you, I got some second hand gun drills which leave a very smooth bore when hand fed. Not cheap ($30 to $40 each), but fast. I don't use or intend to use a compressor.


Thanks again,

Tommy

Re: Drone bore question

Posted: Sat Jun 14, 2014 6:10 am
by DMQuinn
tompipes wrote:...
I got some second hand gun drills which leave a very smooth bore when hand fed. Not cheap ($30 to $40 each), but fast. I don't use or intend to use a compressor.
Can you tell us how you are using your gun drills without a compressor?

Re: Drone bore question

Posted: Sat Jun 14, 2014 3:05 pm
by tompipes
David,
I'm just using them the same way I would use a regular D bit.
The dust collects on the clearing channel but it compacts so it has to be taken out of the work piece and cleared like a regular D bit.
The advantages are the you can ream further with each pass, all the swarf is collected so there's no chance of dust remaining in the bore to throw you off center and the bore is very smooth.
I recently bored timber for 5 sets of drones (no stocks just the actual drones)) and having 2 gun drill bits in the collection saved me at least an hour and a half, maybe 2 hours.
I have a small workshop set up in my basement so using a compressor is out of the question. I have a small but sufficient dust extraction set up but I doubt it would catch the dust that would be forced from a gun drill.

Tommy

Re: Drone bore question

Posted: Sun Jun 15, 2014 7:36 am
by DMQuinn
Thanks, Tom
If it makes the hole, that's what counts.

Re: Drone bore question

Posted: Sun Jun 15, 2014 12:51 pm
by fiddlerwill
thats what I do as well.

Re: Drone bore question

Posted: Tue Jun 17, 2014 5:06 pm
by billh
That's a transcription error that was _supposed_ to have been fixed in the scans. I was fairly horrified when I saw that.

The first joint has a bore of just under 3.6 mm (as one might expect). It does not flare appreciably toward the end of the slide tenon, but it has a slight chamfer.

Definitely one for the errata sheet!

- Bill

Re: Drone bore question

Posted: Wed Jun 18, 2014 2:21 pm
by tompipes
Bill,

I just had a look on pipers.ie and I checked my hard copy and they both read 3.55mm.

I had an old PDF with the old number so all is correct.

Sorry if I caused any panic.

Mind you, there is a document floating around online with Rowsome drones measurements.
Both the stand and slide are 4.8mm in the bore.
Again, it could be an error, a replacement part or a monday morning set...

All the best.

Tommy

Re: Drone bore question

Posted: Thu Jun 19, 2014 3:22 pm
by fiddlerwill
it says 3.6 in mine which i noticed expecting 4.5 apprx . narrow!

Re: Drone bore question

Posted: Sat Jun 21, 2014 2:50 pm
by tompipes
it says 3.6 in mine
In the Coyne B or Rowsome D?

Tommy

Re: Drone bore question

Posted: Mon Jun 23, 2014 12:30 pm
by fiddlerwill
Hannon Coyne B

Re: Drone bore question

Posted: Mon Jun 23, 2014 6:22 pm
by tompipes
Ah right.
It says 3.55mm now. Close enough!

I downloaded the PDF's when they were published first and there was a typo.

I've seen a Rowsome baritone drone stand bore in D that were 3.8. Quite narrow. Could have been an experiment.

Tommy