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Prostheta last won the day on October 6

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About Prostheta

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    "Looks just like a Telefunken U-47"
  • Birthday 07/18/1976

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    Raisio, Suomi

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  1. https://www.cycfi.com/2010/10/cf-truss-rod/
  2. Talk to Cycfi. He's a smart guy and very open with his ideas. No point in reinventing the wheel that was recently reinvented
  3. I'd hazard that it would be very hard to match the properties of a manufactured pultruded section using home gamer methods. You might get 50% of the way, and perhaps - if you run the numbers - that might still meet your end goal. Can you quantify the objective in this manner? I'd say that consistency is the main enemy. A section might have properties that vary in spots which may be less than predictable. This is a rabbit hole. I've always been interested in laminating carbon fibre as pinstripes 3-4 layers thick. That would provide stiffness, however the final finish would need to shield your f
  4. I forgot about the heat-cured part. This is perhaps a property engineered into the epoxy for the process rather than letting it chooch on its own time. Curing in the mould or die through applied heat works from a manufacturing viewpoint so the thing is a continuous process. Given that pultruded products are dimensionally very consistent, this would seem an advantageous choice.
  5. Not sure because this isn't an area I'm too familiar with. I understand the uses of the finished product, but not so much the methods used to create them. I've used pultruded rods in necks before, and they're a nice off the shelf "thing". As for access to epoxies, well, I'm sure that if you're willing to buy a bucket or larger then anything is available. It might be that you can't get it in human quantities.
  6. You mean ee-poxy? The "correct" ee-poxy is one appropriate for the end use!
  7. Regular epoxy is plastic and deforms easily, removing the whole "strong under compression" aspect of why carbon fibre composites rule. If you used a correct epoxy, I imagine it wouldn't need much pulling. Just enough to remove slack rather than warping the thing.
  8. The ideal tool would be a spot facer run in reverse through the pot hole spaced to the correct size, but that's not a cheap tool at those sizes.
  9. 9mm thickness between the front and the cavity is rather a lot. If the plane of the cavity can't completely support thinning it out here for 9mm threaded sections, I'd agree with the partial dishing and partial thinning approach. Just ensure that whatever is cutting isn't "grabby" and is cutting correctly. A Forstner bit that isn't being guided 100% by its rim can bite and gouge. If that becomes part of the "thinning" approach, consider temporarily glueing a dowel into the pot hole so the spur can centre before the outer cutters settle into a groove.
  10. I had to review this thread since I sort of came in late in the conversation and missed the main points made. Stretching the fibre towards the point where it will immediately go into tension would seem to add to the final composite in my mind, so the pultrusion process makes sense. Carbon fibres are strong under tension whilst the binding epoxy is strong under compression, so in its rest state you'd maybe want the material to be at the ideal balance between the two. I doubt you'd get much stretch out of carbon fibre once bound in epoxy, because after all, epoxy still has strength in tensi
  11. Probably? My experience with reinforcement is carbon fibre as lengths of either square or round cross-section, solid or hollow. I was implying that the wood they are replacing (as stiffening bars) is less stiff than the composite that is fitted in their place. The part about cross section was intended to cover hollow, since the volume isn't the same in this instance, especially when fitting an I-beam which (if I recall) is the stiffest cross-sectional reinforcement for the mass.
  12. I missed the opportunity to see them in Helsinki earlier in the year. Then again, we caught Rammstein in Tampere. So many good bands coming from Germany....I digress. Re: "how can carbon fibre reinforce a neck". Generally it's stiffer and lighter (I'm sure there are exceptions) than the equivalent cross section of wood along the grain. I believe this is the fundamental principle behind the idea. @Cycfi made carbon fibre truss rods which i think is exceptional thinking.
  13. You mean Lindemann, surely? Till's side project is entirely separate in both theme and lineup! To be fair, my own personal taste in NDH is Eisbrecher. Then again, I did grow up with bands like Die Krupps in my regular playlists.
  14. No worries man, and good luck. I think on the whole you made the right decision for you. Reset as much as you need, but stay safe and look out for the people around you
  15. Still, it's gambling to me....there's a degree of risk which I mentally need to factor out the exposure from. Some take pleasure from the risk and reward, I like setting up mechanism and machines, then watching them run like clockwork. Equally, I loved hacking when I was a kid. I managed to subvert the school, college and university networks on many levels and created network instant messaging systems before they were even a thing (remember Trillium, ICQ, etc?) but oddly enough, in the Winword macro language, a BBC BASIC emulator and a few other programmable/automatable methods which were with
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