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brianCAD

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  1. If only it was that simple. The Chinese are very able and can turn out a first rate product (e.g. Brawa) when all goes well, but the operation of their business model is something else and isn't as strait-laced as in the UK. Speak with anyone who manufactures in China. After experiencing varying success with model manufacture in two western countries outside of UK (operator ran a machine too fast causing issues, elsewhere another employee fitted an incorrectly radiused carbide tool tip when turning thousands of wheels), my hand is poised nervously over the 'go' button for a first ventur
  2. Chrisp p bacon, sorry old chap but you seem a bit confused about the characteristics, merits or otherwise (mostly otherwise as it happens) of the mechanisms that were/are being considered for the GT3. We can agree on a preference for worm and worm wheel drive direct to one axle, which arrangement served us pretty well for decades. Meanwhile, there is a clear difference between the practicalities of the gear arrangement in Rapido's 'Royal Hudson' and that originally proposed for the GT3. There is no need (and undesirable) for the Hudson's side rods to be loose fitting (assuming th
  3. Agree. But isn't this where KR Models are now going? I haven't looked at the Facebook page, but an image of a revised drive has appeared on this thread.
  4. On spur gear mechanisms, ideally there should be the same number of gears in the gear train leading to each axle, so that backlash is similar at each axle. This doesn't matter for a Co-Co diesel where the wheels are not connected with side rods, but for a steam loco with all axles geared, the addition of side rods presents a double whammy. Not only is accurate quartering required, but this also needs to be synchronised with the alignment of teeth in the gear wheels. The European manufacturers construct very elaborate jigs and fixtures for the assembly of their models, but the Chinese seem t
  5. The mechanism appears to be the same design as used by for Heljan (O scale A3 and assorted diesels), so experience there, good or bad (split gears), should provide some pointers. I would prefer to see an old fashioned X04 or can motor powering one axle directly.
  6. And that may happen. But DJM's custom is quite insignificant when viewed against the volume of model railway equipment the Chinese are catering for globally. Eventually, failing a good offer, they may consider past production has sated the market - and be pleased to move on. There is still good value in the many parts associated with a mould set, even after the expensive cavity work is removed, and it would ease the need for storage, especially where there are multiple tools for a single model. The sudden closure of Affa Technology last year caused quite a re-jigging in the supply chai
  7. Yes, I'd fully expect that the Chinese businesses involved will show that they are also creditors, or at least successfully construe to do so. I don't foresee any return from there to the people who funded Dave's lifestyle. Furthermore, unless the Chinese can make a quick sale of existing tooling, the cavity plates within the mould sets will be stripped out, and the sets modified to accept new cavity plates for perhaps a European, American or Australian prototype. Pandering to the whims of a meddling enthusiast has exacted a toll on all parties - as it also did for Dave's former
  8. Mike (Stationmaster), I'm puzzled by your constant references to .STL files - and that they have value (very limited in my view). STL files are a byproduct format ex CAD, used primarily for 3D printing processes. The files are no more than a mesh of triangles, which if not saved at a high resolution can significantly degrade the information contained in the vastly more valuable originating CAD file, comprised of vector information. Perhaps they could be likened to a pixelated reproduction of a line drawing (which they are when the triangles are shaded) ?
  9. Have tried some of the foregoing methods, but now will not do anything other than turn and fit separate tyres. Tyre insulation has mostly been thin rings turned from PVC (more easily turned to exacting dimensions than Delrin), and secured with super glue. Two locos have ordinary notepaper for rim insulation (0.004" or 0.1mm thickness), soaked in Araldite , with the tyres wrung on. Another set used a variation of Michael's method above, but by cutting around the thickness of the rim instead of the spokes, filling one half length at a time with warmed up Araldite - to make it run an
  10. And in an earlier life, Dave devised a Manor to be much much bigger. . . so its 'power' was fit for a King. Then people revolted and it cost a King's ransom to get the Manor back to its rightful space before any beheading. https://www.modelrailforum.com/forums/index.php?showtopic=6723
  11. With the mess as it is on UK shores, how could we imagine it might be any better in China? Surely, no manufacturer is going to be interested in producing anything now for DJM unless CAD design can be approved in good time (if based correctly on a comprehensively prepared dossier of information). That Dave, apparently is reliant on others for CAD skills makes me think he is ill-equipped for managing these projects. Only after the completion of the CAD stage can the manufacturer get started generating full income from the efforts of his factory workers - assuming the requisite heft
  12. Just curious Richard, what experience/machine have you acquired since this thread quietened down? Despite possessing a wide range of now up to full-sized industrial milling equipment, that started off with the teenaged purchase of a Unimat SL, I'd struggle to recommend any particular machine for model railway hobby use. It's easier to think of what I wouldn't buy! Increasing machine weight and rigidity until the 'right' level is found may later be part of this process - following some initial experience. Brian
  13. What this visiting colonial has done previously is; take the 233 bus from Sidcup railway station directly into Hilda May Ave (for the Leisure Centre). This allows for visiting Invicta Model Rail to the north side of Sidcup station and for buying that new lathe (yes) at Home and Workshop Machinery in Maidstone Rd near the the Ruxley roundabout. -Brian
  14. Thanks Dave. Your parts are indeed small at sub fingernail size. I sometimes find myself defending Shapeways when parts have been produced from elementary CAD or minimally sized STL files. No chance of that from you, using CATIA. Can't be many modellers so skilled or equipped with that package. The blends in your file of the three-legged component are very nicely executed. A model engineer local to me, uses the same machine as Shapeways for waxes. Most are made at the 25 micron setting (for 5inch gauge) and the castings are sold globally. Being a fussy bu99er, I prefer the finer laye
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