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Michael Richwine

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    Shawnee, KS
  • Interests
    Making music, Chinese martial arts, Taoism, cooking, my dog Clete, learning stuff.

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  1. It looks like a "made to look old" from around the late 19th - early 20th Century. I don't know whether that sort of thing was marketed in Europe or Britain, but violins like that are by no means rare in the USA. Just the kind of thing an enterprising Yankee merchant would come up with. First one I ever saw was in Mr. Atchley's shop, and I've seen a few since. They look convincingly old in many ways, but are just too new, with too little oxidation or playing wear, and obviously fake labels.
  2. Good to know, thanks! My ignorance of bows is doing its best to remain undiminished, but time and a willingness to ask naive questions is making inroads.
  3. The slide looks like abalone, but the frog is only half mounted, so wouldn't that relegate it to " fairly late German student bow"?
  4. That's why I qualified what I wrote to "flat surfaces". Not having lived back then, or worked with them, I don't know the practical differences among sharkskin, horsetail, etc. I do know that pumice and a little oil and a rag wrapped on a block work pretty well for the tasks you mention. When I first started working wood for money in the 1950s, the only choices readily available were flint paper, garnet paper, and emery cloth; and protein glue, probably bookbinder's glue, was still presumably the primary binder for sandpaper, still all pre-WWII technology. We didn't really see Elmer's Glue-all until around 1960, although it was introduced in 1951. Casein glue was easy to buy in the local hardware store. I use curved scrapers to pretty good effect, but rubbing surfaces like fingerboards out still looks better. These days I just use paraffin oil and wet-dry sandpaper, but I can try burlap & pumice on a block and see how it works.
  5. I've been using a half-pint canning jar on a trivet inside a small sauce pan on a reliable hot plate since the 1990s. It's kinda clunky, but has always worked well. Since I'm remodeling the shop, maybe it's time to free up some bench space and try one of those bottle warmers. I'm one of those who is reluctant to abandon something that already works well, but I really could use the extra space, and that old pan is awfully crusty.
  6. Pulverized flint or garnet, strong paper, and bookbinder's glue (hide glue with vinegar and glycerin). No doubt available, just not terribly practical nor economical. Would have been pretty expensive, and, then as now, you get a better surface, faster, on flat surfaces, from scraping. Sanding only started making sense when sandpaper became really inexpensive to use. I still think it has more limited application than most.
  7. FWIW, all I'm interested in right now is getting a scanned point cloud that my colleague can use in a professional cad/cam application. I don't have any current interest in 3D printing. So far, I've spent about $120 on a used 6gb graphics card that is compatible with the free software that I will download as soon as the card comes in. Since I do a fair amount of photo and video editing, the GPU upgrade will be a nice side benefit over the 1gb unit I have currently.
  8. Dunno. Don't know whether it was even right or not. Seemed to go awfully low. I wasn't bidding, so just a spectator.
  9. Just thought I'd raise a flag. I'm not bidding on this one, but it closes today, and it's only at $1800 ATM, with some experienced bidders involved. https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=darnton+violin&_sacat=0
  10. Working with a large industrial production CNC router. Not sure of its exact specs, but it has at least a 4' x 8' bed and has a 4th axis setup. The guy I'm working with, who owns the machines, says all he needs is a point cloud file. I'll work with him from there, and learn as I go. I started with machine code in the 1960s, and then Fortran and Cobol on IBM 360s and many generations up to now, but there are plenty of gaps in my experience that need to be filled in. I need a CUDA compatible card to use Metashape, so it's a done deal as far as I can tell, always with gratitude for the caveats.
  11. I've watched a tutorial on Metashape and Blender. It seems I need a GPU compatible with CUDA, which I am in the process of acquiring. This seems relatively straightforward and does produce a point cloud that I can use to produce CNC programs necessary to machine duplicate plates, as best I can tell. There are other projects where the capability to scan shapes would be very useful.
  12. I'll get a 6gb graphics card (GTX1060) that's compatible with the photogrammetry software for around US $100, and should be able to do some preliminary attempts in a few days or maybe a week, depending on how my brain and other workload/ customers treat me. There are some good tutorials on YouTube. I'll post some short updates as things go along.
  13. The results will probably be ambiguous, but at least I'll learn something and gain a new skill. Never a waste of time.
  14. That looks really interesting! I'd have to get a different GPU for the open source software and CUDA, but the current demand for gamer cards seems to have driven the cost of used GPUs way down, even for 4 gb plus .
  15. It's pretty rare to get three players to agree so thoroughly, especially with such close competition, because I had selected each of those instruments with them specifically in mind. The fact that they ranked them in the same order was certainly worth exploring, so I'm interested in investigating those specific instruments. Education is expensive. As it turns out, Jerry Lynn's suggestion of looking at photogrammetry is pretty interesting. Looks like I may be able to achieve my goals with only a camera, my existing photo setup, and some open source software. There's time involved in learning the software and coming up with files that can be used on the CNC, but today it got a whole lot easier. How do you learn stuff without trying it out? If you have a hypothesis, test it! I watched my former boss test different ground formulations on identical (as near as possible) violins for six years, comparing one formula against the other. I would never have believed a ground makes so much difference if I hadn't seen the development process myself. So I'm willing to invest the time and money it takes to test out my hypothesis and see whether it works or not. I can keep the wood the same, cut from the same logs, aged the same, and shaped with considerable precision. To do it with CNC makes it possible to investigate different shapes with control, using a minimum investment of time and materials. I'm sure other makers have done this sort of thing, investigating other variables, but I haven't read about it.
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