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  • Users: CoryPad
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  1. CoryPad

    GD&T modifiers |F and |F/C

    I have a drawing for a casting made from spheroidal graphite iron (also known as ductile or nodular). Some of the dimensions have modifiers like |F and |F/C. See image below. What do these represent?
  2. CoryPad

    Thread designation

    Our customer is a global vehicle manufacturer. A drawing they provided to us for a splined shaft has three internally threaded holes on the end. The thread note says M14x1,5-2 (see attached image). I would like to know what the -2 represents. Usually that position in the thread designation...
  3. CoryPad

    High performance material :-)

    I found an older drawing at work that I thought would be good for a few laughs. It appears that this part requires importation from Bespin. Check note 3 on the attached file.http://files.engineering.com/getfile.aspx?folder=9424dce5-3b62-4f18-a760-220d79ed80b4&file=high_performance_nut.png
  4. CoryPad

    Low cost austenitic steel

    We have an application where we need a non-ferromagnetic material that can be surface hardened to withstand high contact stress. We do not need resistance to corrosion or high temperature. Is there something cheaper than 201/204 that has no chromium?
  5. CoryPad

    Steel group C in ISO 3506-1

    Why is the letter C used as the designation for the martensitic steel group in ISO 3506-1 Mechanical properties of corrosion-resistant stainless steel fasteners -- Part 1: Bolts, screws and studs? The letters A and F are used for austenitic and ferritic, respectively, which is logical. Why not...
  6. CoryPad

    Angular orientation of two hexagonal drive features

    I am joining a hexagonal hub to a shaft with a hexagonal drive feature. These two hexagons need to have an angular misalignment of 10 degrees maximum. What is a good way to specify that according to ASME Y14.5M-1994? An image is attached. Thanks.
  7. CoryPad

    Spot face specifications

    I am compiling best practices for bolted joint design. I would like people to share any drawing specifications they use for spot faced holes for bolted joints. I was thinking about flatness, perpendicularity and surface finish. Thanks for your help. Cory
  8. CoryPad

    Revised fastener references FAQ

    I updated faq725-600 with some new information. Please use the comment link if you have questions, comments, and/or recommendations. Regards, Cory Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
  9. CoryPad

    Wanted: technical reference for shafts

    Wanted: a single technical reference for shafts Content desired: materials used, manufacturing methods, requirements (balance, straightness, surface finish, etc.), end uses, stress analysis, assembly methods (bearings, gears, etc.). Desired cost: [≤] USD 100 Recommendations? Regards...
  10. CoryPad

    Reference for electric motor shaft design

    I am looking for a reference for electric motor shaft design. I see that NEMA MG 1 has some guidelines. What other references (book, textbook, standard, other) are available for learning about this component. I am interested in materials, manufacturing processes, assembly, sizing, and...
  11. CoryPad

    Countersunk joint analysis

    For aircraft joints with preloaded countersunk fasteners (like Hi-Lok, etc.), what equation(s) are used to match joint bearing area with fastener preload? I am not interested in analyzing the joint's resistance to shear forces, only analyzing the bearing stress generated during assembly. For...
  12. CoryPad

    Recommendation for valve and flowmeter

    We conduct corrosion testing. My corrosion chamber uses a salt solution prepared from deionized water. A 0.75 inch inner diameter city water pipe feeds into a reverse osmosis (RO) unit (Millipore RiOs 200): http://www.millipore.com/catalogue.nsf/docs/C8674) The RO unit fills a 60 l holding...
  13. CoryPad

    Inserting units into a range variable

    I am using Mathcad 8. I am trying to calculate a cylinder's mass as both diameter and length change. I have defined the density as rho:= 7900 kg m-3 by using Insert, Unit from the toolbar. I have defined i:=1..8 and j:=1..9. I have defined the diameter and length as range variables...
  14. CoryPad

    Need help with RAR abbreviation

    I have a part that is carburized SCM420H (similar to SAE 4120). I have a report that states the case microstructure is "Tempered martensite RAR 1-2". I need to know what RAR means. I assume it is a retained austenite rating. Any details about this would be appreciated. Thank you for your...
  15. CoryPad

    Equipment for hexavalent chromium detection

    http://www1.shimadzu.com/products/lab/spectro/hcas.html Regards, Cory Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
  16. CoryPad

    Best way to learn Mathcad?

    I am contemplating upgrading from Mathcad 8 Professional to Mathcad 12. Currently I am a novice user - e.g. I can't use it to solve for unknowns. I read the manual and online tutorials and it doesn't help. What would be the best way to learn how to use Mathcad 12 effectively? Are there any...
  17. CoryPad

    Create a 3D plot

    I want to analyze the stress on a part. I want to vary two part dimensions through ranges: l_k = 2, 3 ... 200 mm D_A = 18, 19 ... 200 mm I want to use a Finite Element Method software program to calculate the stress [σ] in the part using these two variables. Then, I would like to...
  18. CoryPad

    Excel chart with multiple x axes?

    I want to create a chart that has mulitple x-axes and one y-axis. For example, I want to plot material strength versus temperature, so the y-axis is strength in megapascals, and the main x-axis is temperature in kelvins. I would like one or two other x-axes for temperature in degrees Celcius...
  19. CoryPad

    VDI 2230 thread engagement calculation

    VDI 2230 February 2003 includes a change to the thread engagement calculation, adding the factor 0,8·P. This was due to new research from Konstruktion 47 (1995) 285-291. I obtained this article and can explain why this factor was added. Physical testing was performed on several...
  20. CoryPad

    VDI 2230 2003 edition

    A new version of VDI 2230, Systematic calculation of high duty bolted joints, has been released this month and is available for purchase from Beuth Verlag at: http://www.beuth.de The new version is bilingual (German and English), contains 171 pages, and costs €178,60 (printed version) or...

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