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Type: Posts; User: matra

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  1. Over the years I was using quite a number of...

    Over the years I was using quite a number of boring heads; many makes in many sizes. All will produce consistent bores once adjusted and locked, the big difference is the quality and accuracy of...
  2. http://www.neme-s.org/Model_Engineer_Files/Gauging...

    http://www.neme-s.org/Model_Engineer_Files/Gauging%20Dovetail%20Slides.pdf
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    I cannot imagine doing surface grinding without a...

    I cannot imagine doing surface grinding without a coolant - especially for precision work. Working with coolant is actually a much cleaner process, with no dust to settle on other machines (even...
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    Yes, I was using a similar approach using a large...

    Yes, I was using a similar approach using a large capacitive discharge spot welder. The wire (or rather a 1/8" copper bar in my case)should be secured in the gap, I used wood wedges.
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    I knew that 3D printed metal parts are expensive...

    I knew that 3D printed metal parts are expensive to make in a system like this, but only reading this realized how many more hidden costs are there - and this even not considering the amortization...
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    5/8" is actually not that thick. I was getting...

    5/8" is actually not that thick. I was getting quite a good cuts even on 2" steel. And I did cut gears on a watrejet. Most machines have quality settings and on the higher quality the cut is slow but...
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    I agree in principle. However sometimes one...

    I agree in principle. However sometimes one encounters a terrible scribble probably done by a troglodyte using a flint. And often there might be some other dents and marks. I must admit that on three...
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    Yes, Phenolic C (C for canvas filled) is the...

    Yes, Phenolic C (C for canvas filled) is the right material, though there is a wide range in quality. I cannot remember who was my original supplier as I do have a large stock bough decades ago, but...
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    I am not sure what material you do have in mind....

    I am not sure what material you do have in mind. I've cut dozens, maybe hundreds, gears in canvas reinforces phenolic, many out of material cut out from a plate. The canvas in the stock is arranged...
  10. Good application for electron beam welding if...

    Good application for electron beam welding if part done in stainless or similar. Prepare a 0.01mm pocket at the bottom of your part and make the foil disc same diameter as the pocket. I assume a...
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    A very good material for gears is canvas...

    A very good material for gears is canvas reinforced phenolic. It is strong, quiet and easy to machine (though dusty if machined dry and needs dust collection). In fact some machine tools, lathes, for...
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    Zirconia, alumina, beryllia...all are hard...

    Zirconia, alumina, beryllia...all are hard ceramics that can only be machined by grinding with diamond tools. Cutting out of flat sheets can be done on a waterjet.
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    I think that as a beginner you should not buy a...

    I think that as a beginner you should not buy a lathe in unknown condition, especially since the one you showing seems in poor shape. As a beginner you you will have enough challenges besides dealing...
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