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  1. UCengno1

    Etching of Ti6AL4V prior to Ti- Anodize

    Ran across an issue recently where we are losing much more material than anticipated during the etch process prior to Ti Anodize. It is a cylindrical shaft that is approx. 1.5 inches in diameter and the supplier identifies that will lose as much as .0001" per side during etch. This sounds...
  2. UCengno1

    Thin wall 17-4 Investment Casting

    We discovered a temperature limit issue with an aluminum design and now need to look at alternatives. We can get 1.5-2mm wall with the casing wall design in AL but not experienced in SSt. By IC Handbook are you referring to the Investment Casting Institute? Is there another prime reference that...
  3. UCengno1

    Thin wall 17-4 Investment Casting

    What is the minimum wall thickness experience for a thin wall investment cast housing produced using 17-4 SSt. Structure approx 8-9 inch diameter.
  4. UCengno1

    Roller bearing standard for angle of misalignment

    Is there a standard for free angle of misalignment for a standard roller bearing, 12-15mm ID.
  5. UCengno1

    Debris from carburized gear

    Good point! See you there. BCK
  6. UCengno1

    Debris from carburized gear

    Sorry about the delay in response... Appears that a vast majority of the debris was from the gear elements. The material breakdown indicated primarily 9310/4340 material content. The gears in use were actually 8620 so I assumed that the program misidentified the material as 9310, 8620 was not...
  7. UCengno1

    Debris from carburized gear

    Terry, You make a great point about the media "suspended" in the lube being non-metallic. Kind of an "ah ha!" moment. We have a standard Chicago Rawhide oil lip seal on the forward end, viton with the garter spring for contraction on shaft. We have observed grooving in the shaft that could...
  8. UCengno1

    Debris from carburized gear

    Ron, Gearbox currently utilizes a synthetic lube per Mil-L-7808. The time to color change is disturbingly short, only 3-5 minutes of operation. Good question on the platings as all of the major components are unplated but I need to verify the small stuff; i.e. spacers, lock-rings, etc... Will...
  9. UCengno1

    Debris from carburized gear

    I get my SEM results back on Monday, 10/3. Will post those results when avaiable. That will shed some light on the situation. I was trying to be pre-emptive on whether anyone had experienced this type of black staining in the lube due to carburize. Thx. BCK
  10. UCengno1

    Debris from carburized gear

    Ron, That is what I am considering. Do that make sense? Regarding analysis. 1) Particulate analysis pick up an even mix of non-magnetic and magnetic media. 2) Magnetic media was very fine matter. Partial consituent was 9310 but a large amount was unidentified. SEM in process to define the...
  11. UCengno1

    Debris from carburized gear

    A product we produce in specific configurations utilizes a splash lube planetary gearbox for speed reduction. The sun (nitralloy) and fixed ring gear (8620) are nitrided and the planets (9310) are carburized. In order to facilitate identification of lube refill we have recently added...
  12. UCengno1

    ANSI B1.20.1 Wrench Tight Make-up Enforcement

    We have struggled with proper inspection methods for NPT threads created using NC lathe. We run into conditions where the L1 gage works as required but have struggled to determine a way to verify the L3 depth. There is no appropriate NPT gage and it is the feeling of some that it is proper to...
  13. UCengno1

    Inspection of NC machined NPT

    We have struggled with proper inspection methods for NPT threads created using NC lathe. We run into conditions where the L1 gage works as required but have struggled to determine a way to verify the L3 depth. There is no appropriate NPT gage and it is the feeling of some that it is proper to...
  14. UCengno1

    Riveted formed steel cage vs nylon cage w/ spherical seat

    We admittely are overspeeding a bearing with a riveted steel cage due to some new customer applications. We are trying to see what alternative could be investigated to improve the speedability. The easiest is to play around with the cage, of which we have limimted options, and make a small...
  15. UCengno1

    Riveted formed steel cage vs nylon cage w/ spherical seat

    Will I see much, if any, speed rating advantage with the snap-in nylon cage / spherical seat versus a riveted, formed steel cage. Grease packed running in the mid 20k rpm. 12-14 mm ID. ABEC 1. Also any ideas on gauging an advantage for same issue with speed by moving to an ABEC 3? Thoughts or...
  16. UCengno1

    9310 Fracture Mechanics Properties

    Yes it is carburized. Does variable mean directional or just dependent on the specific carburize results?
  17. UCengno1

    9310 Fracture Mechanics Properties

    Am searching for fracture mechancs properties for 9310 alloy steel. Need for input to NASGRO. Any idea where to look? I have a couple of the easier to find properties but the crack growth properties are evading me. Any help is greatly appreciated? BCK
  18. UCengno1

    Quantifying value of legacy shot peen on pinion

    unclesyd / swall Thanks for the feedback. I saw testing in the crystal ball but was unsure if any other verification analyses had been developed. BCK
  19. UCengno1

    Quantifying value of legacy shot peen on pinion

    I am reviewing the value of retaining a shot peen process on a carburized, low alloy pinion. The pinion is subjected to an initial shock load at start-up followed by a 1-3 sec duration steady load. Operating speed of 3-5k rpm and it must last in the neighborhood of 10k start cycles. The...
  20. UCengno1

    301 SST magnetic in full hard condition?

    A QC person where I work was using the magnet test to determine if a washer supposedly produced from 301 SST was non-magnetic. I find that there is a 37-45 Rc hardness requirement that can only be achieved in the full hard condition. Am I correct in thinking that the material will be at least...

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