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  1. trackmaggot

    Shop built sparkplugs for model engines

    If you decide to investigate Tungsten electrodes, you may be interested in micro torch electrodes. You can get them in .5, 1.0 and 1.5mm diameters. They are 66mm (2.6 inches) in length, and come in packs of 15 for 45USD. Link below for reference...
  2. trackmaggot

    Another Rupnow 1 by 1

    What level of confidence do you have in your tools? Has the mic been calibrated, are it's anvils true, has it been dropped, is the back sprung? You might also look at doing a Gage R&R (just for fun) to see if you can identify where the variations might be coming from during the measurements.
  3. trackmaggot

    Getting in Trouble for Metal Chips in the House

    Tack/sticky mats. The cleanroom grade is expensive, but a cardboard sheet layered with double sided tape works.
  4. trackmaggot

    Using DOM or seamless stock as a starting point for cylinders

    DOM tolerances from Ryerson. No indication of copyright.
  5. trackmaggot

    Using DOM or seamless stock as a starting point for cylinders

    Oh yeah, check the material; a lot of hydraulic cylinders are made from stainless.
  6. trackmaggot

    Using DOM or seamless stock as a starting point for cylinders

    Hydraulic cylinders are usually DOM or CDS, and have very fine internal surface finishes. Used you would have to check for scoring or other damage; other than that they are fabbed for high pressure, to fairly tight tolerances. As long as the wall thickness is in the range needed, should be GTG.
  7. trackmaggot

    Using DOM or seamless stock as a starting point for cylinders

    DOM tubing is fabricated from flat strip stock, so it will always have a seam. When done properly, the seam is next to invisible because of the cold work done as the tube is drawn over the finishing mandrel. The process delivers very consistent OD, ID, and wall thickness, while delivering good...
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