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mgdawson

NRG Member
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About mgdawson

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  • Gender
    Male
  • Location
    Sydney, Australia
  • Interests
    Interested in methodology of achieving desired results eg how to colour cannon, making rope, plank bending

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  1. Just a guess, I would imagine they'd be preserved with either oil or a oil/tar mixture which, with repeated coating, would make them quite a dark colour but not black. Mark
  2. Titebond hide glue uses water rather than heat to soften and can be reactivated with water. I have, one one occasion, needed to undo a glued joint, about 40mm square so it took a bit of soaking to get right in but it came apart ok, and the original glue just needed a dab top-up when it came to reassembling. Apart from being an indoor adhesive the only downside, for some uses, is setup time, I think they recommend 30 or 60 minutes clamp time (full strength 24 hours). I've used it on a leatherwork stitching pony where it's under considerable stress with no problems.
  3. Hi Messis I just found this page with formulae for smoothbore cannon internal and external ballistics. Unfortunately not an online calculator but perhaps someone who knows javascript could put it online. https://www.arc.id.au/CannonBallistics.html
  4. Interesting, Safety Data Sheet says it’s 100% nitromethane. You may be able to buy 99% in hobby shops as radio control racing fuel, much cheaper by the litre than than a 60cc bottle if you need quantity. Mark
  5. Hi shortgrass, there are a few wooden boats being built / rebuilt with regular youtube updates. Two i’m following are the ‘Sampson Boat Co‘, where an english shipwright is rebuilding a 130 year old yacht, ‘Tally Ho’ in Oregan and ‘Acorn to Arabella’ where a couple of blokes are building a 1930s(?) yacht design from scratch, including harvesting most of the timber from their property. Both are explaining the how and why. Look around episode 60 in the former and episode 45 in the latter for cutting the rabbet. I could be an episode out in either direction for the explanation you’re looking
  6. I've got a small box of Lego as well as a 600 piece Meccano set, both really handy for temporary jigs / tools etc for all sorts of projects. Unfortunately neither from my child hood, had to go out and buy new stuff but they've both paid for themselves. (On the ToDo list is to make up some block/arms etc with neodymium magnets to use on a steel plate as a magnetic building board which I can combine with Lego jigs and particularly the Meccano.) Mark
  7. Perhaps not historically accurate but I love the look of natural wood, if it's in good enough condition I'd oil it, just my personal preference. Oh, yeah, I'd also replace those posidrives with slotted screws, either stainless or brass. Mark
  8. Hi Bruce, I found a few threads by searching for "keel taper", include the quotes, that forces the search engine to look for the phrase rather than the 2 individual words that happen to be in the same post but unconnected. Mark
  9. This work is also available on gutenberg.org to download in epub or kindle formats. If you don't have an epub reader, howtogeek has a short article with some suggestions or you can get a plug in for your browser. There are also online epub to pdf converters. Mark
  10. Hi Chuck, On leatherworker.net they talk about acetone, MEK (MEKP is not the same), toluene and even general purpose thinners, it depends on the brand of contact. One poster specifically mentions he'd had success with Toluene for thinning DAP weldwood, Acetone for cleanup and less success for thinning. Let us know how you fare. Mark
  11. Thanks wefalck, Mary, Charles I've actually got several blacking compounds for both ferrous and copper based alloys , just never thought to try ball bearings, I always assumed the alloy or chrome plate wouldn't take the black and nor did heat occur to me. Got a gas torch so I just need to get some ball bearing of appropriate size and start experimenting. Thanks again. Mark
  12. Acrylic paint in small quantities with applicator included, what's not to like ? I use it for marking cable polarities, mouse & keyboard dongles so I know which belongs to which, thread witness marks etc etc I get some weird looks in the chemist, but I just smile and let them wonder 🙂 Actually the really fun bit was the new girlfriend when she saw the bottles.
  13. Hi Charles, Just wondering about heating ball bearings, I've done a search on the site but only found mention of it, no details eg how hot, can you do it in an kitchen oven or do you need a torch ? Is it permanent or you need to add a protective coating ? If someone has a link to where this is described it would be appreciated. Also one of the posts I did find mentioned using a chemical blacking solution after heating , so I'm confused, does the heating create the black or the chemical solution and the heat just allows the chemical black to work. If using ch
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