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  • Users: jimbod20
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  1. jimbod20

    Position Tolerance - Hole Pattern

    Have a look at the attached interface drawing. Datum C in the machine definition will satisfy both location and orientation as defined in the customer interface drawing. Machine definition of Datum C (orientation and location) WRT datums A & B is defined by a position tolerance of .002...
  2. jimbod20

    O-Ring Dove Tail Groove Definition

    Hello, I need to modify or clarify the dove tail groove geometry on one of the parts currently being processed in the shop. The modified dove tail groove geometry, using the Parker O-Ring Handbook as a guide, is provided in the attached sketch. The Parker handbook does not define the bottom...
  3. jimbod20

    UNEF Thread Specification Geometry

    I'm looking through the UNEF thread specification standard and have a question. I'll use .625-24 UNEF-3B for this discussion. The standard defines the minor diameter as .5800-.5869. The standard defines the pitch diameter as .6018-.5979. The standard defines the major diameter as .6250...
  4. jimbod20

    Small Metric Size GLT Rubber O-Ring Supply Source Needed

    Hello, I moved this post from the rubber engineering forum this am. I think the mechanical seal engineering forum is a more appropriate forum for this inquiry. I need two specific o-rings that I cannot readily find. Are there any recommendations on where I can find and buy these o-rings? Both...
  5. jimbod20

    Smaller Metric Size GLT formulation O-rings

    Hello, I need two specific o-rings that I cannot readily find. Are there any recommendations on where I can find and buy these o-rings? Both are a metric size in the Viton GLT rubber formulation. #1 size 1.5mmx6mm #2 size 1.5mmx8mm Thanks
  6. jimbod20

    Pressure Test Plugs in Machined Aluminum Housing

    I have a machined aluminum 6061 housing I need to pressure test for leaks and want recommendations/guidance to seal open external ports. Pressure test is governed by customer specifications. Pressure test is 75 psid with air in water for 10 minutes. We machine cores/passages to make all...
  7. jimbod20

    A286 Fastener Design

    I’m hoping to find an MS9556 A286 fastener endurance limit to use for fatigue analysis. I find reference to numbers which vary significantly. A simplified picture of the fastener installation/assembly is attached. A simplified description is a stack of aluminum plates clamped with two...
  8. jimbod20

    Slotted Spring Pin Installed Orientation

    Hello, I have questions regarding the correct orientation of a slotted spring pin used as a torque transfer feature in a rotating drive shaft. The attached picture illustrates the design; - The shaft with the slotted spring pin installed. - The shaft/pin assembly illustrates my understanding...
  9. jimbod20

    MS Bolt Options

    Hello, I'm currently using two MS9556-32 bolts in an assembly and might need a stronger bolt. Details being worked with my customer. I have found the same size in Waspaloy MS9696-33. I'm wondering if I can find a stronger standard or MS bolt the same size as MS9556-32 in a more conventional...
  10. jimbod20

    Joint Stiffness in Bolted Assembly

    Hello, I'm trying to estimate bolt loads in a bolted assembly via hand calculations. I'm struggling with the joint stiffness. I get a wide range of answers using different estimate methods. The joint is a stack of aluminum plates. I provide the attached picture to illustrate the bolted...
  11. jimbod20

    Hole Pattern Used to Establish Datum

    Hello, I wanted to get some feedback. Please reference the attached test fixture drawings. The test fixture mating interface is surface A. My test item "mating part" in the drawing bolts to the fixture via four holes shown pictorially. The test item pilots in datum B. I need the test...
  12. jimbod20

    Sine on Random Vibration Test Requirements Interpretation

    I’m hoping contributors to this site can help me understand how to interpret sine on random test requirements. I’m working design and qualification of a part which must be subject to vibration test per RTCA DO-160G section 8 category R (helicopter) ‘multi sine on noise test’. ‘Multi sine on...
  13. jimbod20

    AS13572 Questions

    Hello, I have a spring supplier produce a custom design spring for me. Material and finish is as follows; - Material is 17-7PH per AMS 5678. - Passivate per AMS 2700 method I, type 8. I have a note on my drawing which states; "shall conform to SAE-AS13572, Type I Grade A, less centerless...
  14. jimbod20

    Corrosion Protection and Electrical Conductivity Between Steel Thread Insert and Aluminum Plate

    Hello, My typical design practice is to install 300 series stainless wire thread inserts in wrought aluminum plates and use high strength steel fasteners for bolted assemblies. The stainless wire thread inserts provide a durable/repairable internal thread in the expensive/complex machined...
  15. jimbod20

    Stainless Steel Wire Thread Inserts Installed in 6061-T651 Aluminum

    Hello, My typical design practice is to install 300 series stainless wire thread inserts in wrought aluminum plates and use high strength steel fasteners for bolted assemblies. The stainless wire thread inserts provide a durable/repairable internal thread in the expensive/complex machined...
  16. jimbod20

    GD&T Callout to Protect Wall Thickness in Valve Housing

    Have a look at the attached hand sketch. I have 10 round holes in a cylindrical valve housing and I want to protect wall thickness between the holes. The holes are .073-.077 inches in diameter. I need to control location and orientation with respect to datum surface A. I want to control wall...
  17. jimbod20

    Bidirectional Positional Tolerance

    I think I have the correct subject line. Reference the attached hand sketch. I have a casting with primary, secondary and tertiary datums E, F and G respectively. E is a surface defined by 3 datum targets. F is the secondary datum defined by 2 datum targets. G is the tertiary datum defined...
  18. jimbod20

    Metric Equivalent to MS9556 Bolt

    Hello, I work in aerospace industry and I'm trying to find an M5x0.8. I'm trying to find something equivalent to MS9556. I need double hexagon extended washer head, 3.5 inches in length A286 material. Can anyone direct me to metric spec and source of supply? Jim
  19. jimbod20

    Casting Definition and Inspsection

    I'm trying to determine if a casting meets an engineering drawing. The engineering drawing which defines the casting is as follows; A primary/secondary/tertiary cast datum structure. Primary datum (E) is a surface defined by three points on a surface of the part. Picture the casting while...
  20. jimbod20

    Datum and Datum Feature Simulator

    Hello, The answer to these questions may be obvious. I am new to many details regarding GD&T. I provide a section drawing from a part to illustrate my questions. The hole is through the part and of fixed size. 1. I believe the datum feature is a cylinder. Is this correct? 2. I believe the...

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