JohnCockburn

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Everything posted by JohnCockburn

  1. yes, there is more to learn than you might think i've not found any difference in colour between KNO2 and NaNO2. And I've never had spruce go red
  2. I wouldn't say that violin physics is uniquely challenging, but a violin is a rather difficult system to realistically model. The idea (as stated by the OP) that anyone who has studied quantum mechanics, statistical physics and thermodynamics at university should find violin acoustics a doddle is just plain wrong. On the other hand, though, if a guy wants to make a violin, where's the harm in that?
  3. Well there ya go, then. There's a John Dilworth "trade secrets" article that'll take you through the process of generating outline templates and mould from the poster. Get cracking on that and the rib structure and report back!
  4. that sounds like a perfectly reasonable plan, but I thought you said you didn't want to buy the poster?
  5. ?? Come on, Davide, of course it is.
  6. Hi Ernie The 10 mm size of this : https://www.cremonatools.com/pialletti-in-ottone-4800.html is (IMO) the perfect plane for bass bars. Mouth width, mouth position, bed angle, blade quality, all spot-on. But unless things have changed recently, the exorbitant shipping cost might be a show stopper. (i bought mine as part of a bigger order).
  7. Agree. Except I'd also want a smaller 00 cut flat file.
  8. Most of the jobs you might want to use a file for ( eg neck shaping, edge work, bridge shaping) would end up being finished with sandpaper anyway, so I don't really see any downside to using sandpaper "files" if you're on a tight budget and/or you only plan to make one instrument.
  9. I'd say it will depend on whether water is involved. I make my purfling with hide glue, bend it dry, and never had any delamination of the layers.
  10. You must be a VIP if they let you do that!
  11. Is this done from a 3-D scan of the original, or constructed somehow from photos? Sorry if this is a silly question. I know very little about this technology.
  12. Bevel up or bevel down is irrelevant as far as the “ruler trick” is concerned.
  13. it means "raised to the power of", so x^2 means x squared, x^3 x cubed and so on.
  14. Thank you for taking the trouble to give a detailed explanation, Marty.
  15. I use a Veritas PMV11 blade in my favourite plane - a well-tuned pre-WW1 No.6. It really is amazing steel that justifies the hype.
  16. Funnily enough this is the only honing guide I ever use - I find it really good for initial/periodic grinding of gouges and thumb plane blades on the Tormek. I do all my other sharpening freehand.
  17. Yes, people often forget/don’t realise that small distortions of the wood caused by application of hot glue can affect the fit of joints that seem perfect when dry.
  18. The LN/Chinese clone price differences seem to be getting smaller and smaller. I think I'd have been inclined to stump up the extra 70-odd bucks for the real thing. Much better resale value should the need ever arise.
  19. I think that you might not know as much as you think you know. No offence intended.
  20. Yes, I've also got several "quality" block planes (3 LN and a Clifton) as well as a Quangsheng. The only thing I found relatively poor in my Quangsheng was the original blade, which I replaced with a Hock. Folks on the UK woodwork forums rave about the Quangsheng blades, but I've had a few in various planes and never been happy with them.
  21. For jobs you mention, I'd go for the full-size adjustable mouth Veritas block plane with a PMV11 blade. Some people find this a bit on the large side though, so if you have smallish hands, I'd suggest the Lie Nielsen 60 1/2. Also, I agree with Bill about Wood River. Current production is excellent (as is Quangsheng, which I think come from the same factory). Not quite as nice as an original LN, but the difference in functionality isn't huge.
  22. I've done it many times, including in lecture demonstrations. What people seem to notice most is loss of high frequency "presence" or "sparkle"to the sound, rather than a drastic change in low frequency output (which is obviously very clearly seen in the change in the signature mode spectrum).