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  1. Stephan Nelle

    Hole size with tolerance for Shaft

    The Machinery's Handbook has a good section on fits between holes and shafts. For a given class of fit (which are described in the section), a table is provided that give min and max clearance between the hole and shaft for the diameter range in question.
  2. Stephan Nelle

    Alternative to Aeroglaze 9700/9743

    @Sparweb, I know it wasn't meant personally. The assumption that my post was a sales ad in disguise, rather than one engineer trying to help another, is what irked me (temporarily). All Is good. Back on keel, the SPS factory burning down has caused at least a moderate rippled in the OEM...
  3. Stephan Nelle

    Alternative to Aeroglaze 9700/9743

    Wil, you are reading too much into this. I am simply offering possible epoxy alternates for the original poster. I've got no ulterior motives. I am an engineer at Air Tractor. We design and build crop dusting and fire fighting airplanes. We must have robust corrosion prevention measures due...
  4. Stephan Nelle

    Alternative to Aeroglaze 9700/9743

    Goat, the epoxy primers listed in the epoxy prime process spec at the OEM I work at are: PPG Desoprime HS: CA7833, CA7502 (chrome free), CA7700, and C7755 Sherwin Williams Aerospace Coatings: SM0483928 (base), CM0120828 (activator) Most commonly, we use the PPG 7833. If we need chrome-free...
  5. Stephan Nelle

    Is there a source for beaded flanges per AS5131?

    Kirby, also check these out: https://www.grahamtool.com/tube-beading-tools
  6. Stephan Nelle

    23.603(b) Workmanship must be of a high standard.

    For those in the Part 23 world, curious to hear your interpretation and application of 23.603(b). No ulterior motives, purely curious to hear how others in the industry interpret this rule and show compliance to it. In my mind it is a bit of a catch-all, showing the design is well thought...
  7. Stephan Nelle

    Alodine aluminum AFTER installing nutplates

    Thanks, all, for the replies. I'll stick to my position and demand a "no". I knew it was a bad idea, but nice to hear other confirming opinions.
  8. Stephan Nelle

    Alodine aluminum AFTER installing nutplates

    rb, Oh duh, on the WDC acronym. This assembly is a location not terribly accessible, so we want a more long-term solution than WDC. I hear what you are saying about the nuance of the specific installation, but I'm not trying to debate with them (or Eng-Tips) about this specific...
  9. Stephan Nelle

    Alodine aluminum AFTER installing nutplates

    rb, They (Group 1) don't have any evidence to support their claim. I think just wishful thinking on their part, really. I know 5052-O is not high strength. I purposefully left out details of what it is or what it does because I don't want to derail the topic with those details. It isn't...
  10. Stephan Nelle

    Alodine aluminum AFTER installing nutplates

    Having a debate with another group internally. Here's the scenario: 6061-T6 plate welded to a 5052-O tube. The plate gets NAS680A3 nutplates riveted on with (alodined) AD rivets. Group 1 is pushing to weld the plate to the tube, then rivet the nutplates to the plate, then alodine the whole...
  11. Stephan Nelle

    SCEET Hose Spec

    Wil, super! Thank you very much! Now to request input from folks familiar with SCEET hose in the (aircraft) industry: Have you seen similar delamination between the inner and outer layer? Have you set up an inspection criteria to determine if the bond between the inner and outer layer is...
  12. Stephan Nelle

    SCEET Hose Spec

    Is there a mil-spec or similar industry spec (AN, MS, NAS, AMS, ASTM, SAE, etc) that SCEET hose is made to that provides dimensional, material, and performance criteria? Like an AN960 washer spec sheet, but for SCEET hose. The manufacturer of the SCEET hose that my company has been using for...
  13. Stephan Nelle

    permanent ink felt-tip pens [Sharpies, etc], any color, EXCEPT BLACK! (quiz: why not black)

    TugboatEng, thank you!
  14. Stephan Nelle

    permanent ink felt-tip pens [Sharpies, etc], any color, EXCEPT BLACK! (quiz: why not black)

    Interesting thread. I knew about graphite from pencils causing problems on aluminum skins. I used to work at Mooney and this was a well-known no-no there. But I hadn't heard about the issues of chlorides or acids in Sharpie ink, and hadn't thought about the carbon dye in black Sharpie ink. I...
  15. Stephan Nelle

    Why is unidirectional tape(cfrp) difficult to process?

    IFRs, I worked at an composite experimental GA company for a couple of years. The airplane was mostly carbon fiber but had some fiberglass. We tried using the water jet machine to cut fiberglass but quickly eliminated it as a possibility because it created delaminations emanating radially from...
  16. Stephan Nelle

    best tools - more used (useful) tools

    I am not quite 12 years out of school and am at my third general aviation engineering job. My thoughts, in no particular order: -Don't fret over which CAD software you learn. Once you learn one they all essentially do the same thing and transitioning from one to another isn't as bad as you'd...
  17. Stephan Nelle

    7075-T6511 Extrusion S/N Curves

    RB, valid points. I had thought about the scatter factor covering small differences. Just didn't know how small (or not small) the differences would be, though I initially guessed pretty small. I am new at this so glad to hear advice from experienced guys. My intent is to compare a Miner's...
  18. Stephan Nelle

    7075-T6511 Extrusion S/N Curves

    LD, thank you very much. I will find a copy.
  19. Stephan Nelle

    7075-T6511 Extrusion S/N Curves

    I am looking for S/N curves of 7075-T6511 extrusion. The closest I have found is the first S/N curve in the 7075 section of MIL-HDBK-5J (Figure 3.7.6.1.8(a)or MMPDS-01 (Figure 3.7.6.1.8(a) MMPDS-08 (Figure 3.7.9.1.8(a) and MMPDS-13 (Figure 3.7.10.1.8(a)...these are the documents I have access...
  20. Stephan Nelle

    SOME QUESTIONS REGARDING SHEET METAL

    I may be stating the obvious, but bending parallel to the grain direction of the material (Option #1 image in your first post) can cause cracking on the outside of the bend if the bend radius is too small. Avoiding this cracking largely (maybe wholly) drives minimum bend radius, at least when...

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