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  1. berkshire

    metric screws and a/nuts ?

    RB, You have probably looked here, but if you have not, this may be a good place to look: https://www.clarendonsf.com/products/bolts-screws/aerospace , Having worked for about 40 years on both German Sailplanes and motor gliders. The Europeans tend to use two standards, the LN (Luffshart...
  2. berkshire

    FAR § 25.493 Equation

    So, this is a student post then? B.R. You are judged not by what you know, but by what you can do.
  3. berkshire

    Lazer welding

    Thanks guys, Your observations confirmed my suspicions, it's not worth it for a small shop, thank you all. B.E. You are judged not by what you know, but by what you can do.
  4. berkshire

    Lazer welding

    I have a company trying to sell me a Lazer welder, they are of course promoting this thing as the next best invention since sliced bread. The weld speed is faster, and the penetration appears to be good, but the welds appear scruffy at best, (I am used to TIG welding.).Most of my work is on...
  5. berkshire

    Looking for a thermostat with a programmable output to control a motorized damper

    Any thermostat with setback capability should handle this, you may need to use a relay. B.E. You are judged not by what you know, but by what you can do.
  6. berkshire

    Dealing with filiform worm on 2024 aircraft skins.

    I have an aircraft wing which has developed filiform worm between the skin and the paint. I am now looking at the best way to deal with it. I realize that all the paint has to come off the affected areas. After the paint is off, I am looking at Phosphoric acid, then Alodine unless anybody has a...
  7. berkshire

    Best machine for cutting packaging foam for a small business?

    Have you considered making simple sheet metal molds then using expanding Styrofoam beads, you can expand these yourself with the necessary steam equipment or take them to a Styrofoam molder. B.E. You are judged not by what you know, but by what you can do.
  8. berkshire

    Bowing out

    This thread was started in 2003 by Scott Wertel, and for a while, in fact several years, it was a lively thread. Then Alibre started its own discussion group about 5 years ago and this group has withered on the vine. For a couple of years now I have been the lone poster At age 80 I am...
  9. berkshire

    Can I butt weld 1 1/8 .035 4130 tubing or do I need a "fishmouth" sleeve?

    Most of the German welded airframes use straight buttwelded joints, sometimes with an internal sleeve sometimes without. In the States when we repair them, we use a rosette welded internal sleeve, or a fish mouthed external sleeve. B.E. You are judged not by what you know, but by what you can do.
  10. berkshire

    heat loss through insulated pipe line

    One other item to check is the aluminum covers over the insulation. Where are the joints in the wrap? If the overlaps are in the wrong direction, then water instead of being shed off the cover will run inside wetting the insulation, giving you all of the problems previously described. B.E. You...
  11. berkshire

    6013-T4 Natural Aging Curve

    Try a maker: https://datasheets.globalspec.com/ds/3794/AlcoaNorthAmericanRolledProducts/2CE70646-F89E-4D2F-9A32-7DDE102401DD First hit on Google. B.E. You are judged not by what you know, but by what you can do.
  12. berkshire

    Hot dimple machine.

    This may help, check out page 7. https://mmptdpublic.jsc.nasa.gov/prc/MIL-STD-403C.pdf. B.E. You are judged not by what you know, but by what you can do.
  13. berkshire

    Autocad 2022

    Ok I have now gotten to the bottom of this. It is a book on how to use AutoCAD 2022 artfully disguised as the program itself. B.E. You are judged not by what you know, but by what you can do.
  14. berkshire

    Autocad 2022

    Ok these things have been showing up on Facebook $68 download the program and it is yours to keep forever. It just looks too good to be true. B.E. You are judged not by what you know, but by what you can do.
  15. berkshire

    Autocad 2022

    I am seeing AutoCAD 2022 offered for prices as low as $65. Is this a change in Auto desks policy. Or what is going on here, it seems too good to be true knowing the previous pricing policies of this company. B.E. AutoCAD 14, AutoCAD 2002. You are judged not by what you know, but by what you...
  16. berkshire

    Manufacturing Bent Z profiles

    To bend that profile, you would need to use T0 then heat treat after forming. As far as bending in the strong dimension a buffalo roller with custom wheels or stretch bending would be your best bet. B.E. You are judged not by what you know, but by what you can do.
  17. berkshire

    How do you stop the inside of a hollow iron joist from rusting?

    Take a tip from the aircraft makers, and install tube oil. This is a drying oil you slosh on the inside of the tube similar to linseed oil. B.E. You are judged not by what you know, but by what you can do.
  18. berkshire

    de Havilland Comet Design changes

    Here is something on punch riveting, I do not know if this is the system that De Havilland used but it sounds similar.https://www.sae.org/publications/technical-papers/content/830600/although the date is much later than the 1950s B.E. You are judged not by what you know, but by what you can do.
  19. berkshire

    de Havilland Comet Design changes

    This is from memory with no document references. one increase the size of the radius at the window corners. Two change the rivet edge distance from 1.5D to 2D ,remember this happened almost 70 years ago. B.E. You are judged not by what you know, but by what you can do.
  20. berkshire

    Riveting Idea

    This was a fairly easy problem until you mentioned that the rivets had to be smooth on both sides of the sheet. there are several solid stem rivets by manufacturers such as Cherry, Huck, and other makers that have a solid core locked in by a retaining ring that would satisfy your shear strength...

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