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  1. Looks like at least 1 is 10" OD with a 3" ID.

    Looks like at least 1 is 10" OD with a 3" ID.
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    That is probably more down to the hole not being...

    That is probably more down to the hole not being straight and round than it is to being dead on size... And have you actually measured the drills to compare them to the hole size? Either way, are you...
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    2545 pdf I just looked up seems to show one setup...

    2545 pdf I just looked up seems to show one setup as a centrifugal unloader attached to the crankshaft, maybe that's what you've got? There's also a hydraulic one controlled by oil pressure like you...
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    I would guess it's a mechanism so that the turret...

    I would guess it's a mechanism so that the turret can move along the rail without the counterweight needing to follow with it. The counterweight just balances the turret head so the screw alone...
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    How are you determining the hardness? Annealing...

    How are you determining the hardness? Annealing either should just take heating and letting it cool down. Quenching isn't necessary, it's just frequently done so the part that's been annealed is cool...
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    Generally the unloader is built into the pressure...

    Generally the unloader is built into the pressure switch when the head unloaders aren't used. Does it hiss/bleed down after it shuts off?
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    As far as causing oversized holes? The wobble or...

    As far as causing oversized holes? The wobble or lobing that happens with a poorly started drill; dull or otherwise damaged cutting edges; land wear or improperly formed lands; excess feed and/or...
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    I think it depends on the exact compressor and...

    I think it depends on the exact compressor and valve setup. I would investigate the valve and see how it works, where the passages go, how the valve moves and what gets blocked/opened when it does,...
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    Ahh, so you don't use the unloader? I guess it...

    Ahh, so you don't use the unloader? I guess it wouldn't be important to plug it then. IIRC the unloader ports are sort of like an air-powered switch. When air pressure hits that line it either opens...
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    Yeah that's generally true, and I wasn't making a...

    Yeah that's generally true, and I wasn't making a case for anything different, so I'm not sure why you posted that. But do you know why? Instead of quoting "my book says so?"

    118° was arrived at...
  11. Very possibly. Look at the part, would that make...

    Very possibly. Look at the part, would that make sense in terms of exposure to wear?
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    Pretty sure those compression fittings should be...

    Pretty sure those compression fittings should be connected to something for the unloader to work properly. Are you losing air there?
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    Good start. Did you use angular contact bearings?...

    Good start. Did you use angular contact bearings? How are you going to handle preload? What speeds are you aiming for?
  14. Heat treat codes with 'N' may suggest nitriding.

    Heat treat codes with 'N' may suggest nitriding.
  15. Yes, that's correct.

    Yes, that's correct.
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    Man. Lucky dog. :)

    Man. Lucky dog. :)
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    In my experience this is way off base. Split...

    In my experience this is way off base. Split points came about as a good way to reduce the thrust requirement to drill holes. Same with 135° point - shorter cutting edge length = less thrust. Higher...
  18. Pressing will not generally work well to take out...

    Pressing will not generally work well to take out a warp, peening is much more fine tuneable. Like for instance if your bar has 3 corners touching flat and one up in the air. It is also much easier...
  19. Yes he finally did.

    Yes he finally did.
  20. I'm sorry, but pulling a piece of steel through a...

    I'm sorry, but pulling a piece of steel through a boring (or milling) cut with a cable on top of a bench is just silly. You need a positively located and precisely fed setup for something like this...
  21. Don't need to do any of that to get 50 millionths...

    Don't need to do any of that to get 50 millionths though, just adding lines on the dial would have done it. And I've already got a ½ μ indicator if I need that.
  22. Yes, that is nice. I've got a Compac that has...

    Yes, that is nice. I've got a Compac that has about the widest graduations for a .0001" indicator I've ever seen. Don't know why they didn't add some extra lines in and get down to .00005" - would...
  23. Thread: Estate auction

    by eKretz
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    I offered more than once to help out with zero...

    I offered more than once to help out with zero response, apparently they feel they have it covered. Or maybe I'm just not worthy... :D
  24. And use the most openly dressed, free-cutting...

    And use the most openly dressed, free-cutting wheel possible until you have the part nice and flat. After that you can get your finish. I don't like to peen or use heat to straighten unless...
  25. Probably depends on the parts you're looking for....

    Probably depends on the parts you're looking for. I have an 818 of the latest vintage and have seen some of the prices paid for parts by the company that last owned it. Bourne and Koch has some...
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