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  • Custom DC Power From Microwave Oven Transformer

    I've recently watched a video which uses an MOT for Lichtenstein wood burning. The creator of the video noted the third winding and advised he knew not of its purpose, using wire nuts to prevent contact with the coil ends. I noted that the coil count was quite low and figured it meant low voltage, high current, as opposed to the desired high voltage output used for burning.Is it safe to lock off the wiring in the manner he used? Is it safer to join the wires together and insulate the connection? What's level of voltage would one expect from such a winding? I suspect it has little real-world application when used in combination with a Lichtenstein burning apparatus.

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  • fred_dot_u commented on TheBeardlessMan's instructable Sea of Thieves Treasure Chest7 weeks ago
    Sea of Thieves Treasure Chest

    You would have to allow for the "stretching" backwards as the chest opens. It would require to have a small bulge in the leather when closed and as TheBeardlessMan suggests, use thinner leather. Leather is quite strong, even material as thin as a millimeter or thinner, which would make it work.One way to ensure you have sufficient stretch/bulge would be to position the top open, then attach the leather. When the glue dries, it will automatically bulge when closed.

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  • Let's Build Your Simple Dome With "PLLWS"!

    Your method of joining struts is a wonderful discovery. I have a laser cutter which will make cutting leather shapes quite easy, although very very malodorous.I've been interested in geodesic shapes for much of my life and have pondered the various joining methods. Your method appears to be quite economical, especially if the leather is sourced from thrift shop belts.It's important when building higher frequency geodesic shapes to have proper strut length calculations, which includes the spacing at the joints. Do you have a calculation for compensating with this design? That is to say, a perfect geodesic model would have struts of zero thickness and would join at a single point. In the real world, one adjusts for the method of connecting. If, for example, the design required a strut of ...

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    Your method of joining struts is a wonderful discovery. I have a laser cutter which will make cutting leather shapes quite easy, although very very malodorous.I've been interested in geodesic shapes for much of my life and have pondered the various joining methods. Your method appears to be quite economical, especially if the leather is sourced from thrift shop belts.It's important when building higher frequency geodesic shapes to have proper strut length calculations, which includes the spacing at the joints. Do you have a calculation for compensating with this design? That is to say, a perfect geodesic model would have struts of zero thickness and would join at a single point. In the real world, one adjusts for the method of connecting. If, for example, the design required a strut of 40 cm (perfect) but the join used 2 cm, one would subtract 4 cm for a strut length of 36 cm to make the assembly.Do you perform similar calculations?

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  • E-dohicky the Electronic Version of  Russ's Laser Power Meter Dohicky

    This is a very comprehensive well written Instructable. Nicely annotated and accompanied by great photographs. I am hopeful to be able to construct one of these meters. I have Russ' dohickey and it works great, even though it is only slightly bulky to have a temperature meter and probe with separate wiring. Your project turns the entire assembly into a very convenient hand-held sophisticated power meter.Have you considered to provide the PCB files in SVG, AI, or DXF or other vector format? I ask, because laser cutter owners can create PCBs by masking the copper board with black paint, then burning off the non-copper areas of paint, followed by etching in appropriate solution.Congratulations on a great project presentation.

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  • fred_dot_u followed SparkItUp10 months ago
      • The Ultimate Guide to Laser-cut Box Generators
      • Slow Dance - a Fusion of Art and Magic
      • Android Christmas Lights Controller
  • fred_dot_u commented on HeatherW185's instructable Mousetrap Car1 year ago
    Mousetrap Car

    What do you think about using discarded CD or DVDs for the wheels? It may be a bit more work to add a hub to take the axles, but less expensive for those who have a few otherwise useless disks.

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  • fred_dot_u commented on brichtl's instructable Laser Engrave Metal1 year ago
    Laser Engrave Metal

    It's amazing to consider that there's one other marking compound that should be used for stainless steel. It's grey poupon mustard!https://youtu.be/B60nXwhK9gk

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  • fred_dot_u commented on PhilH40's instructable Simple T Track for Woodwork Jigs 1 year ago
    Simple T Track for Woodwork Jigs

    The method in the instructable will result in a more accurate slot as well as a more easily aligned, glued and clamped slot cover. Nicely done.

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  • Generating Elliptical Boxes Using a Laser Cutter and Inkscape

    Even with the Inkscape_helper files in place, this plugin does not work with 0.92 version of Inkscape. That's unfortunate, as this could be quite a wonderful add-on for the program.

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  • RooBee One - SLA DLP Aluminum Frame 3D Printer

    Not a free software package at US$495, but has a free trial here:https://datatree3d.com/software/

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  • fred_dot_u completed the lesson Welcome to CNC in the class CNC Class1 year ago
  • fred_dot_u commented on mikey77's instructable How To Make Your Own Sugru Substitute2 years ago
    How To Make Your Own Sugru Substitute

    I can see that might be the case. One would then expect that the suguru stuff doesn't use a similar method to catalyze. There probably isn't much moisture in the cornstarch until it is opened. After that, all bets are off.

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  • fred_dot_u commented on mikey77's instructable How To Make Your Own Sugru Substitute2 years ago
    How To Make Your Own Sugru Substitute

    Walmart still sells the right stuff. You don't have to smell it to ensure it's the correct product. Look on the label and you'll see it has a "warning" that says acetic acid is released during cure. Acetic acid is vinegar. The wrong silicone has a similar warning, but the release chemical has a longer name I've forgotten.

    Once the caulk-type tubes of silicone are opened, they will cure internally and become useless in a short time. If you have a food-saver type vacuum sealer, the tube can be sealed inside and will last much much longer. Even the low priced hand pump version will increase the shelf life of the unused silicone. The gallon size bags are difficult to find locally, but I checked Amazon and they are available there.It's also possible (but not tested) that any unused oogoo left over could be saved in a vacuum bag.If you use the hand pump vacuum bags, add a piece of adhesive tape on the vacuum flap of the bag to ensure it doesn't accidentally release and let air inside.

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