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  1. clockworkcheval

    Eagle

    When a tap breaks in a not-too-big or complex workpiece of steel I simply throw the thing in the wood stove that heats my workshop. Next morning I can almost always get the broken tap out with a regular HSS drill.
  2. clockworkcheval

    Eagle

    By far the best way to remove difficult-to-reach broken taps is EDM. In a few cases I ask a friend of mine with acces to a wide selection of EDM equipment to do this. However I first try to use a HM drill. As most taps are HSS a HM drill will cut them up. As a regular full HM drill is rather...
  3. clockworkcheval

    help building canopy protective shelter for car parking

    Your second initial sketch with the beams resting only on the existing walls would be preferred for my cars that have an uncanny tendency to collide with additional poles in their surroundings. On the other hand the cantilever design looks beautiful and will surely give you an unforgettable...
  4. clockworkcheval

    Single Depth of Thread for 26 TPI

    Hello Ken, I hear and feel the crunch! With my Schaublin 102 VM off about 70 years old when I set the endstop on the halfnut relief the carriage will come to a standstill after 2,5 mm. So with a blind hole I turn a relief groove at the inner shoulder of 2 mm wide and then very carefully set the...
  5. clockworkcheval

    Are lathe tool carbide inserts supposed to be sharp?

    My mistake: it is indeed CBN - Cubic Boron Nitride. Hardness only second to diamond. Rpm for a 200 mm CBN wheel 1400 - 3000. The base of the CBN wheel is a steel disc or drum, so no distortion or explosion, and no dressing. Diamond wheel 200 - 250 mm rpm 90 - 100. The base of the diamond wheel...
  6. clockworkcheval

    Are lathe tool carbide inserts supposed to be sharp?

    The only set-back of diamond grinding wheels compared with CBS is, as I understand, that CBS is very heat-resistant but a bit less hard than diamond whereas diamond is very hard but not really heat-resistant. If diamond gets too hot it will crack and pulverize. So a slowly revolving wheel...
  7. clockworkcheval

    Are lathe tool carbide inserts supposed to be sharp?

    The slow turning diameter 250 mm wet grinder of Tormek is very good and outrageously expensive. A couple of years ago I could convince the powers to be that one had to be purchased because it is very good at razor-sharp grinding of kitchen knives. The first few times the enclosed band-aids...
  8. clockworkcheval

    Mathematical question

    The cartoon reminds me of my first visit to Copenhagen Airport about 1981. We were welcomed by a large poster of a ferocious Viking complete with helmet and sword and the words 'We have already been trading for more than a thousand years with the rest of Europe', clearly to support the then...
  9. clockworkcheval

    Mathematical question

    Wow! We didn't search for it, but found and lost the Big Bang. Confusing experience.
  10. clockworkcheval

    Cutting fluids

    Nice to recognize the different opinions on cutting fluids. In our horological society and its light cuts we mostly prefer pure oil cutting fluids, applied with a dispenser or just a brush. Some members use in their home workshop 'mist' or cutting oil applied with air. Two problems here 1) when...
  11. clockworkcheval

    Some questions about lathe

    The measurements to check the alignment of the centerline of your lathe can be complex and time-consuming as illustrated in the texts above. A quick way to check whether such measurements are required is to put aan thin metal plate between the centers in the headstock and the tailstock. The...
  12. clockworkcheval

    Single Depth of Thread for 26 TPI

    A small side remark that is probably obvious to many: when cutting a thread with a pitch that can divide the pitch of the lead-screw in a whole number you can disengage and engage the halfnut at will and still stay in pitch. For example with a 4 mm pitch leadscrew you can do this with treads of...
  13. clockworkcheval

    Installing new lathe

    Additional considerations for me in mounting the machines are working height, tooling storage and transport. As good working height standing straight up I target a sightline of 15 degrees down from the horizontal. I use U-beams to raise the heavier machines (on average 300 mm), and I weld frames...
  14. clockworkcheval

    Some questions about lathe

    Hello Nikhil, very commendable to check the accuracy of your machine! Whatever is precise enough depends fully on your expectations. For my horological components a runout on a testbar in a collet near the spindle of plus/minus 0,02 mm is fine. And very much more precise than the equipment that...
  15. clockworkcheval

    Installing new lathe

    I use plain rubber pads of about 10 mm thickness under my machines. Their weight is between 200 kg and 700 kg. I do only light and balanced work.
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