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Vodkaman last won the day on October 19 2017

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About Vodkaman

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  • Birthday 10/03/1956

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  1. copy machine

    I can't find the video of my attempt at a duplicator. The post is there but the pics are lost. Anyone wishing to attempt such a project, I am here to assist in any way I can. Dave
  2. copy machine

    Here is the Redg8R original video:
  3. How to find center on a round dowel?

    Estimating the centre of a small circle is easier than a large circle. Applying this principle: 1 - Open the bench vice slightly. 2 - Place the dowel on top of the jaws. 3 - place palm of hand on dowel and lightly push back and forth so the dowel rotates. 4 - touch a pencil on the end of the dowel while rotating. 5 - estimate the centre of the small circle. You can adjust the vice jaws to get the best rotation. This method has worked well for me. Dave
  4. Do You Save $$$ Making Your Own jigs ? (Video)

    Great video. Yes, money is saved, no doubt about it. If the person decides to buy more molds with that extra money, that is a separate issue. Dave
  5. Lure consistency

    The wood is the weak link in consistency as the density varies. I overcome this by controlling the final density and adjusting the ballast accordingly. This does not mean that you have to do Archimedes on each lure. You just need to know the density of the plank, and keep notes. This is all particularly important if you are going for a lure close to neutral buoyancy. My prefered buoyancy is a 10% floater. If you are copying a favourite/successful lure, it is a good idea to measure the final buoyancy, this gives you a reliable number to aim for. This may sound complicated, but with practice, it becomes second nature, with of course an accurate gram scale. Dave
  6. Physics of vibration and motion

    I do believe it is mate, a rapid up and down motion. Dave
  7. Physics of vibration and motion

    Anglinarcher - many thanks. I still haven't set up my workshop and so there will be no more videos for a while. I was doing a lot of fishing, 2x 3 hour competitions per day, but they would only let me use a specific bait, tapioca jelly flavoured to your own choice. I was doing well too, with a daily success rate higher than 50%. I have a job now and so the rest of my activities are on hold. Dave
  8. Physics of vibration and motion

    As stated above, it is all about vortices, more specifically the Kármán vortex street. If you go to YouTube and search for 'flat plate vortex street' you will find plenty of examples. These vids are fine for explaining what happens with a front lipped lure, but for rear lipped lures it is not the whole story. Jointed lipless lures are also driven by vortices created around the nose of the bait. So, you have an alternating vortex flow which then interacts with the rear lip. You cannot consider the vortices as independent, the water flow is a complete or closed system were the vortices work together. If the lip width is tuned to match the nose vortices then a more powerful action could be developed (theory). Here is a video of a round and square lip side-by-side. The different lips should have a slightly different oscillation speed, but you will see that the lures swim in perfect sync as the vortices interact.
  9. Barrel twist wire screw eye

    Mark - Thanks. Gliders - LOL If I was to build another I would make some changes so I wouldn't have to mess about with a screwdriver, and make it easier in my fingers to move the plate with more leverage. Dave
  10. Barrel twist wire screw eye

    This is a video of a barrel twist tool that I designed. I see no reason why it wouldn't work with thicker wire.
  11. Apology for posting pics

    The rules make sense, and separate TU from the 'also rans' in the world of lure design sites. Embrace them, don't fight them Dave
  12. CAD and 3D printing

    A LOT of time is involved. BUT, if you construct the model right, it will be possible to make changes very quickly and easily. Also, I can change the length of the lure, keeping the relative proportions. All the major dimensions are stored as variables, so simply by changing the variable value, I can control the model dimensions. A short stubby 2.5" lure will be no good as a 6" lure, but by changing the thickness variable I can make it useful again in seconds. Dave
  13. CAD and 3D printing

    Here is an image of my bluegill. I have this printed off, but I can't find it after my last house move unfortunately. Dave
  14. Archimedes Dunk Test

    I worked on the water displacement method before developing the 'dunk test', which incidentally I discovered here on TU, in an old thread. I rigged up jars with connecting pipes but no matter how hard I tried, I just could not achieve the accuracy that I required for small lures. The method works well for large objects as the error becomes less significant with size. I now own a gram scale that has an accuracy of 0.01g. With my old 0.1g scale I could get very close to suspension, but the new scale will nail it every time. Suspension is a lot more complex than an accurate scale though. You have to take into account the paint and top coat, hooks and eyes. The 'dunk test' can only put you in the right ball park, the rest is up to you. Dave
  15. 3D Printed molds

    I have had a 'taker ' for my offer. But unfortunately my work situation has changed, and paid contract work has to take precedence. My customer understands the situation, and I fully intend to fulfill my offer, and the shrimp will be delivered, but timescales are out of my hands. Regretfully, I have to withdraw the offer for anyone thinking of taking me up in the near future, but I may well open the offer again. I find this work interesting and challenging, even comparing with my normal work as a car designer. Dave