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  1. Mechanola

    What Is Your LEAST Favorite Tool

    I just try to avoid them as much as possible. I remember the internal taper I had to turn in 1.4404 during my apprenticeship. It was like making internal sound drums for a weird grammophone, an endless squeaking. My master forced me to find a way around vibrations but it was almost impossible...
  2. Mechanola

    What Is Your LEAST Favorite Tool

    Boring bars. Internal turning should not be done with those.
  3. Mechanola

    Ongoing unrest in Russia

    It is so simple. No TV, no Moon landings. No PC, no Mars pictures. I agree, everybody wants to believe it. Look up the ephemerides to see how carefully the date of the first Moon landing was chosen. Nobody escapes the power of the Twelve.
  4. Mechanola

    Learning to set up a mechanical "swiss" lathe

    Yeah, from my experiences in long turning as it’s called here a ground bar is very important. Can also be drawn, most often the case with brass. Adjust guide bush to nice slip fit. Don’t cut too deeply because you would build up pressure on too many things machine and stock. Use a good cutting...
  5. Mechanola

    Drilled hole repeatability issue

    Do not use two-fluted drills on lathe but an Ecocut.Ceratizit.
  6. Mechanola

    Help chatter while machining a shaft (CNC lathe).

    T’s got to do with the spindle bearing(s) closer to the nose. The work can wobble together with the chuck between the rear spindle bearing(s) and the tailstock center (bearing).
  7. Mechanola

    Help chatter while machining a shaft (CNC lathe).

    The more positive the rake angle the less pressure between tool and work. Under negative angles the tool scrapes, at positive angles it cuts. Material removal happens more easily but the tool becomes weaker because narrower between chipping surface and back relief. At a certain point you want to...
  8. Mechanola

    Help chatter while machining a shaft (CNC lathe).

    With that holder you have a negative back rake angle. It’s for roughing. To finish to a clean surface change that to zero or even positive. The side edge angle should be bigger. Speed: the material can be turned at up to 90 m/min. or 300 sfm, so at 100 mm diameter 286 rpm max. Depth of cut not...
  9. Mechanola

    Major Rusting Issues In Our Building All Of A Sudden??

    I have asked about salt in the streets because common salt is a chlorine compound, sodium chloride. Get rid of everything chlorine and or fluorine compound. Muriatic acid is your enemy.
  10. Mechanola

    Help chatter while machining a shaft (CNC lathe).

    You didn’t mention the holder. What are the angles of the insert to the work? Geometry is important.
  11. Mechanola

    Major Rusting Issues In Our Building All Of A Sudden??

    Are you near a road or city street that gets salted during wintertime?
  12. Mechanola

    How do you handle people touching your tools.

    Such discussions are strange to us. In this country a mechanician who works for a wage does not own any tools. Everything belongs to the firm. Screwdrivers, wrenches, millers, insert holders, measuring equipment, even the most modest rule is not my affair. We don’t have toolboxes.
  13. Mechanola

    A scraping mystery

    The column may have a crack. Simply broken material. You don’t see anything but it could be there. Do you have an outline?
  14. Mechanola

    Holes in a bent plate.

    So then a no-brainer, clamp under the jet and make two openings, they are not too far apart. Then you can ream the two together. Or hone
  15. Mechanola

    Trouble drilling and thread milling stainless from Duniway

    You mean to say 0.00012 inches? That is too shy. The tool rubs instead of that it cuts. Give ten times more. Surface speed should also be higher, in the region of 160 ft/min.
  16. Mechanola

    Holes in a bent plate.

    Do you have a waterjetter in or around Tomah?
  17. Mechanola

    What’s going on at Boeing

    I think people need to learn to read continuous text again and to write meaningful text as well. The whole quality and security checking is worthless in a world of illiterates. Like Boeing, it’s Böing, dammit, a German family name. The ö is not pronounced o.
  18. Mechanola

    What’s going on at Boeing

    As of late I had a Paillard-Bolex H-16 on my bench whose mechanism was jammed. Nothing would budge. Upon disassembly I found the spring clutch fork pinched between a gear of the clutch group and the clutch control arbor. The two screws by which the fork mount should be attached were present but...
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