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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. CNC Router

    Good advice by Frank. Dave
  2. Resin microsphere ratio

    Resins are heavy, generally with a specific gravity (SG) of 1.2 whereas water has an SG of 1.0. Therefore resin is 20% heavier than water, and as you discovered, it sinks fast. Check the information on your particular resin product. You will need to experiment with ratios to find what works for you. If you add 30% spheres (by weight), this will reduce your SG to around 0.9 which should float. But, you still have to incorporate you hardware and top coat, which will increase the total SG of the lure. The big problem is that; the more spheres you add, the thicker the mix will become. There will come a number were the mix will not pour. The most that I mixed in was 45%, this reduced the resin mix to an SG of 0.68. This mix had the consistency of thick mustard, and obviously it was not pour-able. I solved this by injecting the paste with a cake icing syringe. If the pour-able ratios don't work out for you, and you decide to try the syringe method, message me first and I will go into more detail. The heavy expanding foams (as suggested above) are a lighter solution, but they come with their own set of problems. It is just a learning curve. Dave
  3. Separating fiberglass molds

    I have made resin molds, and find floor wax very effective as a release agent. Be generous with the wax, as the heat generated in the curing process will melt the wax and give you a good contact between the two halves. I apply a little heat from a gas blow torch to melt the wax, then brush it on with a half inch cheap brush. Try not to burn the house down Dave
  4. Another method: make the lip too long, then gradually trim back. Make notes of the effect. On the test lure, keep trimming beyond what you think is perfect. You have to find the optimum, which you can only find by going beyond. Yes, you have to sacrifice a lure. On a new design, I might sacrifice 20 to find the optimum, but with each sacrifice I learn a bucket full of information. Dave
  5. 100% with Bob on this. Experiment with tow eye position. This has the most dramatic effect. Dave
  6. 3D Printed Baits

    Here is sheet 1 of a PDF of a simple lure. It shows the float angle calculated in CAD. In reality, it was spot on. The other 3 sheets is the rest of the design. bawal lure 13_Sheet_1.pdfbawal lure 13_Sheet_2.pdfbawal lure 13_Sheet_3.pdfbawal lure 13_Sheet_4.pdf If the PDF does not work for you, message me your email, and I will send. This goes for anyone interested. Dave
  7. 3D Printed Baits

    I use CATIA V5. The CAD model can be assigned a material density. I also model the ballast, harness, split rings and hooks, each with their own density material applied. I inquire the CoG of the basic assembled body shape (no density added) and create point-1. I then inquire the CoG of the assembled model with material densities applied. Here I create point-2. Draw a line between the points. The angle of this line indicates the angle that the lure will float. In the water, the line will be vertical, so rotate the model and line to the vertical, and that gives the floating attitude. As for ballast: inquire the volume of the assembly, inquire the weight of the assembly. Divide the volume by the mass. if greater than 1, then the lure sinks (fresh water). You can even incorporate sea water density and make a correction. But remember, the angle the lure floats is NOT the angle the lure swims. That is far more complex, and is beyond simple calculation. Dave
  8. 3D Printed Baits

    I haven't done anything on lures for a while, but I have been experimenting with 3D printing the molds rather than the lures. Of course, it all starts by 3D CAD modelling the desired lure. My aim is always to make the mold symmetrical such that you only have to print one side model repeatedly, rather than having a left side and right side. This would enable you to print out multiple molds that are all interchangeable, for a mass production situation. CAD design of 3D molds is particularly useful for creating hollow lure halves, including ballast pockets and harness slots. CAD is also useful for determining the amount of ballast required for a lure, and determining the angle at which an assembled lure would float. Dave
  9. 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
  10. copy machine

    Here is the Redg8R original video:
  11. 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
  12. 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
  13. 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
  14. Physics of vibration and motion

    I do believe it is mate, a rapid up and down motion. Dave
  15. 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