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  1. C

    Boring bar or reamer?

    The shop I work for bores a lot of holes in aluminum and titanium. They do use reamers sometimes, but I notice that the holes requiring +/- .0005 always get the boring bar in the CNC mills. These boring bars are touchy and innacurate, producing many rejects, but management insists upon using...
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    Net-Inspect for Boeing parts.

    I have been with this company for about three months now, and it feels like culture shock. When manufacturing took a nosedive in the NW, I spent some time learning new ways to support myself, and now it's picked back up. So i am back at it - cnc machining. The culture shock part is that I have...
  3. C

    Speroni tool presetter tsp 46

    So, I am learning how to use a speroni tool presetter for my new job. While I was in instruction, someone came in and said that the speroni had measured .030 WRONG for a tool he had set earlier. My instructor had noticed that the tool adapter axis was in the wrong angle of rotation, and so he...
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    Bending stress in tension - eccentric load.

    I am very happy that I was able to resurrect a useful bit of engineering from my college days. If you have a rod, or a bolt in tension, and the load isn't straight down the axis, you get a bending stress that increases the tension on one side and decreases the tension in the other side. So if...
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    Chasing cast-in threads on inconel - HELP!

    My employer prepares test specimens of various exotic materials for tensile testing. These samples are 3" long cylindrical pieces, with 1/2-13 threads on each end for about 3/4 inch. These need to be chased and cleaned up for the holders of the testing machines, and they can't be just hit with a...
  6. C

    Live center gets hot.

    So, some live centers are supposed to run hot I have heard, and others not. What about a Royal Products quad bearing live center? Hot or not?(Like, so hot the coolant is smokin' off of it!)
  7. C

    Hey - I can't figure out why it says "plastic" under my name.

    I have checked edit profile, but I can't locate where to fix that.
  8. C

    Materials testing

    I have a new job where I prepare metals for tensile, chemical, and hardness testing. I'm seeking a forum where I can discuss certain aspects of this field. The thing that is on my mind at the moment is that we must sand specimens for hardness testing. Doesn't this work harden the surface that we...
  9. C

    rotating program in the 500

    In the shop I work at, we use a 2 pallet haas 500. The progams are universal to our other haas, vf-2 and vf-4. To use them in the 500, we must rotate them with a g68 at 180. degrees. Now this works fine until we try to rotate a program with xz or yz contouring. I have tried all kinds of...

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