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Recent content by mrainey

  1. mrainey

    Learning CNC software

    In my opinion, it's virtually impossible to create significant CNC programs without first spending a good deal of time working with cutting tools, fixturing, machines, and materials. Coding, as with application programming, is often the easiest part of getting the job done. Software For...
  2. mrainey

    I will have a trial for programming job

    Never mind. Software For Metalworking http://closetolerancesoftware.com
  3. mrainey

    I will have a trial for programming job

    Look at this program. http://closetolerancesoftware.com/MEStd.html Software For Metalworking http://closetolerancesoftware.com
  4. mrainey

    Unilateral VS Bilateral Tolerancing

    I spent twenty-five years doing cnc programming and process planning in a variety of machining environments. I always aimed for the middle of the tolerance, be it unilateral or bilateral. I don't recall ever getting any negative feedback from customers that had to do with my interpretation of...
  5. mrainey

    Thread percentage vs broken taps.

    I worked for several years for a major manufacturer of large electric motors. Their manufacturing documents specified a 55% thread for cast iron and low-carbon steel. I don't recall hearing of any thread failures. Software For Metalworking http://closetolerancesoftware.com
  6. mrainey

    Drilling 4140 Annealed. Feeds/speeds/drill selection

    My calculator comes up with 70 SFM at .0086 IPR for HSS drills on a similar material. That's about the same cycle time as you're doing now - the question would be is tool life any better. Software For Metalworking http://closetolerancesoftware.com
  7. mrainey

    Drilling 4140 Annealed. Feeds/speeds/drill selection

    You would benefit greatly from thru-coolant tooling, particularly if you're using a vertical machining center. Peck drilling with carbide is generally not recommended, as it can lead to thermal shocking and/or recutting of chips. Software For Metalworking http://closetolerancesoftware.com
  8. mrainey

    Machined Groove In Sheet Metal

    What's the width of the groove? If really small, you might have to go around two or three times, which could get expensive. Software For Metalworking http://closetolerancesoftware.com
  9. mrainey

    Stub Acme Thread Callout Tolerance - 1/1000 or 1/10,000 inch

    Except for class 1B and 2B with minor diameters of 0.138 or larger. Software For Metalworking http://closetolerancesoftware.com
  10. mrainey

    Very Large UNC taps

    As others have said, single-pointing (lathe) or thread milling (machining center) would be better approaches. If lot size was small enough, you could even threadmill with the single-point tool (slow). The tap would be an expensive, single-purpose tool. Software For Metalworking...
  11. mrainey

    Any way to nest existing G-Code jobs?

    This free program is designed to convert G-Code to dxf. Judging by the user comments, it works pretty well. http://www.cnczone.com/forums/opensource_software/8814-g-code_dxf.html Software For Metalworking http://closetolerancesoftware.com
  12. mrainey

    UN thread checking

    If the tip of the threading tool has chipped or broken down, or if a tool with the wrong radius has been selected, you'll never know it using thread wires as your only check. The pitch diameter and pitch can be good while the root geometry isn't. Software For Metalworking...
  13. mrainey

    M30x1.5-4h thread

    My software outputs numbers that agree with yours, +- .001mm. Software For Metalworking http://closetolerancesoftware.com
  14. mrainey

    UN thread checking

    You can't check the thread form with micrometers. Software For Metalworking http://closetolerancesoftware.com
  15. mrainey

    M112 x 1.5 thread

    Those values make your thread non-standard. Software For Metalworking http://closetolerancesoftware.com
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