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  1. Replies
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    I've only drilled holes in thin molybdenum, but...

    I've only drilled holes in thin molybdenum, but it didn't seem like anything special.

    If I'm hand tapping holes in thick steel or stainless or aluminum or whatever I drill to the root diameter and...
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    Just wack on an itty bitty VFD.

    Just wack on an itty bitty VFD.
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    Not that it makes sense in any or all cases, but...

    Not that it makes sense in any or all cases, but I have seen systems that have a small return line from the end of the run to allow fluid to maintain a constant speed through pipes, and allows...
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    If it was deemed necessary to replace all pipes,...

    If it was deemed necessary to replace all pipes, wouldn't it just be easier to dig new trenches where current infrastructure allows and leave the existing stuff? I'd imagine it's passivated enough on...
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    I think the most practical coating would be a...

    I think the most practical coating would be a passivation layer, which the water treatment plants add extra goodies to maintain
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    Worth considering that if you mess with lead...

    Worth considering that if you mess with lead pipes you damage or remove the passivation. If you have to replace a piece it's generally in the best interest of the public to redo the run.
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    I practiced grinding lathe tooling for aluminum...

    I practiced grinding lathe tooling for aluminum from mild steel because I could remove metal much faster than HSS. It worked okay but I think most of my issue was I'm still pretty bad at grinding...
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    I've found for hand drilling that if I use a good...

    I've found for hand drilling that if I use a good split point 1/8" bit (aircraft type C maybe?) It doesn't really matter what I follow it up with. The pilot drills easily and any reasonably sharp bit...
  9. Are you trying to do this in a press brake or a...

    Are you trying to do this in a press brake or a shop press? If it's a shop press you need guide bushings to keep the dies centered and an adjustable block to gauge the back surface off of, otherwise...
  10. That will work poorly. The punch and die will...

    That will work poorly. The punch and die will stick, the material will gall, the tonnage required is quite high, and you won't get a full 90. You need a release wedge on the die and a stripper on the...
  11. I do weird stuff similar to this with a narrow...

    I do weird stuff similar to this with a narrow taper step drill and a mile of 1/4" drive extensions. The step bits have 1/4" hex shanks, and tend to be sharp enough to start easily despite wobble and...
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    Assuming they call "drill bits" just "drills"...

    Assuming they call "drill bits" just "drills" what do they call handheld drills? Power braces?
  13. I haven't gone back and reread the entire thread,...

    I haven't gone back and reread the entire thread, but I would make it using a tight gooseneck punch and rolla vees on the long bends, and a custom radius punch for the end. The V die used would have...
  14. You *could* put two 30 amp breakers in parallel...

    You *could* put two 30 amp breakers in parallel on each leg.

    Safety hazards. Gotta catch 'em all.
  15. In an arcing circuit the voltage rises to the...

    In an arcing circuit the voltage rises to the breakdown voltage and suddenly draws a large spike of current until the current drops to basically zero on every half wave.

    In an SCR motor drive the...
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    Talking out of my ass here but I look at some...

    Talking out of my ass here but I look at some people's (good) hobby mills that have 24krpm spindles and they use small endmills at high speed to take stupidly small chips at a decent feed rate. Those...
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    Dry receivers are the best IMO. People keep...

    Dry receivers are the best IMO. People keep advising us against it but their reasoning didn't add up to me, especially with the aftercooler built in to our compressor. Just size the dryer for the...
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    Nobody mentioned the fun approach of a three...

    Nobody mentioned the fun approach of a three phase motor running a few alternators in parallel
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    Our Ingersoll Rand stuff has been pretty low...

    Our Ingersoll Rand stuff has been pretty low quality honestly.

    We got a Quincy air dryer to replace the broken integrated one on our screw compressor and they are so far one brand that hasn't...
  20. I did find that McMaster has some nonporous...

    I did find that McMaster has some nonporous alumina tube with a thermal conductivity about 15 times that of glass or fused silica. It's still only about a tenth of that of aluminum, but I think it...
  21. I tend to use sealed reservoirs and suction pumps...

    I tend to use sealed reservoirs and suction pumps on coolant systems to prevent leaks, so up to -5 psi from ambient is the max it could see, and likely much less.

    I do actually have quite a few...
  22. The most convenient would be a section of tube...

    The most convenient would be a section of tube with a water jacket
  23. Material for corrosive liquid heat exchanger

    I have an interest in dye lasers but some of the gain media I'd like to try is very corrosive. Either the solutions themselves contain lots of chlorine ions, or need to be in an acidic solution to...
  24. I've done brakes on a forklift. Squeaked before...

    I've done brakes on a forklift. Squeaked before and after, and not from a squealer. Our newer forklift squeaks under hard braking, and my 60 year old forklift did too, when it had brake fluid.
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    I mean torsional rigidity, i.e. twistiness....

    I mean torsional rigidity, i.e. twistiness. Thrust stiffness is a pretty valid point though.
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