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  1. How is that supposed to work for measuring bore...

    How is that supposed to work for measuring bore diameter?

    Horseshoe and micrometer catridge?
    http://www.bdmfg.com/surface/portable-align-boring-machine/measuring-tools
  2. I haven't seen 62.5 degree rhombic inserts and...

    I haven't seen 62.5 degree rhombic inserts and Google doesn't give much results either.

    Are you mixing insert angles and toolholder angles? 62.5 degree approach angle is "symmetric" or "neutral"...
  3. Lotsa square feet work to your advantage if you...

    Lotsa square feet work to your advantage if you pump high pressure oil between the sleeve and shaft.
    10k psi oil between the sleeve and shaft and the shaft is free-floating most of the way until...
  4. oops. It sure felt like too little as I have...

    oops.
    It sure felt like too little as I have been playing with pipe bending machines that were ~1000kW power range for that size of pipe...
    But having a flu and bit of fewer & dizzy head is...
  5. Sleeve like that is about 200kg. With specific...

    Sleeve like that is about 200kg. With specific heat of 0.5kJ/kg*K that would need for 200c temperature rise 200kJ.
    200kW output induction heater would heat it in one second. About 0.02kWh and zero...
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    Tool too high, too small relief angle or cutting...

    Tool too high, too small relief angle or cutting edge blunted before finishing.

    Parting tool is extremely sensitive for height and closer you get to center the more accurately it has to be set. ...
  7. Beyond my garage hobbying but system similar to...

    Beyond my garage hobbying but system similar to high pressure oil system that is used when installing large bearings would help tremendously.

    Drill one or more small holes in the middle of the...
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    Milling the tool out of the hard HSS is nasty...

    Milling the tool out of the hard HSS is nasty business. Possible but you wear expensive endmills too fast to make any sense out of it. And you would still need to finish the cutting edges with...
  9. Unless my eyes are lying there is also live...

    Unless my eyes are lying there is also live center on the end?
    L/D ratio of 20 in threading is going to be lotsa fun even with tailstock support
  10. Add the usual tricks: Keep heavy copper/lead...

    Add the usual tricks: Keep heavy copper/lead hammer over the shaft, change to different feed rate for each pass (to break up the previous pattern and change the harmonics to different frequency) and...
  11. Difference between 2hp VFD and 200hp VFD with...

    Difference between 2hp VFD and 200hp VFD with limited supply is that the large VFD can supply enough current/torque at low voltage (low frequency) to start even hugomongous motors but tiny VFD hits...
  12. I started practicing TIG welding with pretty much...

    I started practicing TIG welding with pretty much aluminium only.
    I never had any problems seeing the puddle but maybe that's because I wasn't used to TIG welding steel first.

    Alu is pretty...
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    Sit tight if Miller prices seem high.

    Sit tight if Miller prices seem high.
  14. Replies
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    1,094

    Yup, largest commonly available air(gas) cooled...

    Yup, largest commonly available air(gas) cooled torch is WP-26 and generally rated for 200A or 180A DC 60% duty cycle or 150A AC 60% duty cycle. (AC puts more heat on the electrode and torch...
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    SCR's are more tricky to control and generally...

    SCR's are more tricky to control and generally huge pain in the ass if you want to design inverter welder. High frequency switching capable SCR's are pretty much dinosaurs in this power range with...
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    Since the general dislike for anything chinese in...

    Since the general dislike for anything chinese in here I'd recommend Kemppi or Fronius. ;)

    As others pointed out suitcase size and aluminium AC capability don't match well but at least the...
  17. Replies
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    You should start calling cold rolled sheet...

    You should start calling cold rolled sheet Sendzimir rolled :D

    Cold rolled might actually mean cold drawn. Or cold forged.
    And mill is used for rolling. Milling machine for milling.
    And...
  18. Methanol for general purpose cleaning..good luck...

    Methanol for general purpose cleaning..good luck with that in California.
    Yuck. I'm not safety Nazi when it comes to solvents but I wouldn't wash my hands with methanol.
    ...
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    (Grey) cast iron is really easy to file but...

    (Grey) cast iron is really easy to file but depending on how rough your castings turn out there can be still plenty of work left.
    Filing was lot more common back in the day and probably only viable...
  20. Water jet or wire edm comes to my mind also if...

    Water jet or wire edm comes to my mind also if the hole is so deep that you need to mill it from both sides.

    Extra long reduced neck 3/8" = 9,5mm end mill?
    Helical Solutions - 4 Flute, Square -...
  21. At least not in this case and even generally not...

    At least not in this case and even generally not problem. DIP packaged chips are mostly low power ones that won't need cooling and they are from era of history when cooling via ground planes wasn't...
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    I'd say custom product..looks like maybe turned...

    I'd say custom product..looks like maybe turned from setscrew.
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    How much use you have planned on those? Insert...

    How much use you have planned on those?
    Insert pockets have nasty habit of deforming in heavy use or if you chip the insert badly and hardening can help somewhat with that. Round insert probably...
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    1960...

    1960
    http://dir.cisc-icca.ca/files/technical/techdocs/historical/historicalsteels.pdf
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    Anyone notice that this is 7 years old thread...

    Anyone notice that this is 7 years old thread that was previously digged up by fresh Indian poster 2 years ago and just now by another Indian ;)

    Any new Indian members: Please re-schedule thread...
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