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That is interesting - I have a friend who plays Clarinet and he commisioned a Bassett Clarinet specifying Cocobolo with Gold fittings (10k!!). Two were made and he now owns both. It's a beautiful wood, both in appearance and to work.

If you were to run an M10 Tap through an existing 3/8UNC hole you would only get 3 (at most 4) clean threads. Here's a drawing of the two - the left hand image shows both threads superimposed and the right hand image shows what the end result would be.

But not allowed on his headstone in English - Duirt mé leat go raibh mé breoite

If they are Unified then they are likely to be 3/8" which is nominally 9.525mm OD. UNC is 16tpi, UNF - 24 and UNEF 32. UNS could be anything! An M10 coarse thread would be 16.933 tpi (1.5mm pitch) and the 'fine' equivalent 1.25mm pitch (20.32 tpi). Of course you can buy Unified bolts in the...

Not at all Andy - very similar spelling but very different meanings

I have little interest in this subject but the basic concept does concern me - in case there is a nation-wide roll out ! However that statement does seem to cloud the issue. As I understand it, (I have been known to be wrong!) it is per DAY --- the subtle difference being if you are 'in the...

At 12.2mm OD that is likely to be a ½" nominal (12.7mm) - regrettably the 'standard' ACME would be 10 tpi - though ACME 'Standards' are somewhat loose because it's essentially a specialist thread often designed with specific criteria in mind. If Ian comes up trumps you wont need to concern...

The resolution of the images posted is too low for me to be certain but I suspect that the thread is ACME. To some extent this would make sense, knowing the purpose of the thread. The chances of finding a matching 'nut and bolt' without sourcing another same make Compas Plane are vanishingly...

Then neither of you are using correctly ground tooling! - In the case of power feed, there ought to be a chip-breaker created so that the length of swarf is limited. If the feed is by hand then it's very easy to 'interupt' the cut with a very brief pause in the feed.

I happen to be one of those 'rare' people. For me, CNC is often a means to get a quicker accurate result. I recall my father encouraging me to think about anything I intended to 'make' by first creating a drawing - specifically, I remember him saying; "If you can draw it, lad, you can make it"...

Perhaps you need to look a little closer. The second image clearly shows that the chuck is an Axminster Evolution SK114 Woodturning Chuck. viz. enlarged attatched screen-grab. I appreciate that it has what appears to be metal-working jaws mounted but it's certainly not a metal-working chuck.

That wouldn't do the job in hand. - The 'Inverted U' will have a screw in the centre which is the clamping mechanism and will be exactly in the position that the hole needs to be drilled. I'm assuming that the round plate with 4/5 holes (centre + 4) is effectively the clamping mechanism in...

Hmm... the waters here are very muddy :) I use a CNC machine to create all manner of 'things' - look back over some of my posts this year and you'll see the 'Giraffe' Clock and the 'Siamese Cat' box to mention just a couple. These were designed and made 'by hand' - ie. 'created' from my own...

❓:dunno:❓

You don't show the "bar of metal behind the round bar" so it's to some extent a guess as to exactly what you did. I have to presume that it was narrower than the dia. of the Alum bar and flat. The whole concept is so wrong in so many ways but, skipping over that, you say "drill a side hole" but...

I was actually just addressng the basic principle and hadn't looked that closely at the original photo's, but yes, the further 'out' the cutter is the larger will be the size error.

Though not an ER type, that IS a parallel closing collet so does have a 'range' that could well cover 6mm & ¼"

I suggest that 'works' ought to be taken with a large pinch of salt - sorry. An 'ER' type collet closes [parallel] over its range but simple draw-bar or closing nut actuated collets just squeeze the nominal size. Over a few thou this is not a problem but you will surely see from my sketch that...

Not in a million years! - An 'ER' Collet has a 'potential' range of 1 mm in most sizes (0.5mm in some) but the type of collet used in routers - with just 3 or 4 slots cut in one end - will only securely clamp a range of a few thou, 5 would be asking a lot, I doubt that a 6.25mm shank would...

'Normal' thread drift then !