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  1. Madhu454

    Maximum Material Modifier for Press fit holes

    Hi All, Need help with choosing the correct material modifier for press fit holes (H7), while using a positional tolerance. Need to position TWO HOLE PATTERN (Diagonally placed on a rectangular plate) with a position tolerance, Dowel pins to be fitted to these holes, these dowel pins(m6) will be...
  2. Madhu454

    Which Screw stud to be used?

    Hi All, I need your help. I have two 3mm steel sheet. I want to connect both of them with the screw stud. Also I don't want the screw surface to protrude over the sheet on both sides. Is there any self tapping screw studs available? if So can anyone help me with the Standard of screws? Is there...
  3. Madhu454

    ASME GDTP Senior Exam

    Dear All, I had completed ASME GDTP technologist certification in 2011 on 1994 std. Now I am planning to prepare for ASME GDTP senior level exam. Could any one help me to understand. 1)How Technologist level exam is different compare to senior level exam? 2)Is the questions are more related...
  4. Madhu454

    Mechanisms and Robotics

    Hi All, Could you please suggest any good books on Mechanisms and Robotics to start with. With suitable practical applications Thanks in advance.
  5. Madhu454

    Rework by maintaining associativity : NX

    Hi All, Could any one of you tell me the best practices that needs to be followed while adjusting the NX models based on the existing files. Most of the times we have to use new part file instead of the existing one, and still maintain the associativity of all the child features. How best this...
  6. Madhu454

    Conversion of Ra to Rz surface roughness

    Hi, Is there any thumb rule or acceptable guidelines to convert Ra surface roughness values to Rz surface roughness values?
  7. Madhu454

    Formula : Threaded Holes on both the plates

    Hi, Appendix B of 2009 std explains the formula for Fixed and Floating fasteners. For some reason if I want tapped holes on both the plates. How to calculate the positional tolerance for such cases? Can anyone help please me on this.
  8. Madhu454

    Contoured Datum : Fig 4-29 of 2009 Std

    Hi, I am referring to figure 4-29 of ASME Y14.5-2009 standard. Could anyone help me to understand the concept clearly. 1) The datum feature "B" is a semicircular surface (feature). Since there is no opposed surface to this, it is not a feature of size, But in fig (b) Datum B is identified with...
  9. Madhu454

    Min Wall Thickness - GD&T v/s Note

    Hi, Please see the attached drawing. The left side of the drawing where the min wall thickness is controlled using a note. Where as the right side shows the same part is made with GPS to control the Min wall thickness. Is the drawing with GPS adding any additional value compare the one shown in...
  10. Madhu454

    Fabric Flat Pattern

    I am trying to use Fabric Flat pattern to foldout a surface. I can see on the screen that the meshing is not covering the entire surface of the sheet body. I tried to even vary the primary and secondary orientation directions slightly, which improved to some extent, but could not mesh the...
  11. Madhu454

    Surface Quality Check.

    Hi All, I need your help. I am asked to check the surface quality of a turbine blade. Never worked on this activity before. What are all the commands available in NX and how to judge/check the surface quality. Please help me on this. We use NX8 in our organization.
  12. Madhu454

    Metric Std for Drill size

    Hi, I need your help in defining the right size holes while making the drawings. Is there any ISO metric standard available to know the standard drill size. Can anyone help me to find the standard. Thanks for your help in advace.
  13. Madhu454

    ISO 2768

    Hi All, Please help me to understand the confusion with using general tolerances as per ISO. Question: If the drawings is made as per ISO standards, and no tolerances specified. Which grade of ISO 2768 is applicable? The drawing does not say anything about the grade to be followed (Like H, K or...
  14. Madhu454

    Flatness : With convex & concave error specification?

    Hi All, I have one question, I have an extruded square part. The bottom surface where it makes contact with its counter part, is controlled with a flatness of 2mm. I have a design requirement for flatness, the convex error allowed is only 0.5mmm. it can have concave error upto 1.5mm. How do I...
  15. Madhu454

    Profile tolerance : Offset surface

    Hi All, Have one question regarding profile of a surface tolerance. The tolerance zone is formed by sweeping a spherical ball of size equal to tolerance value over the toleranced surface to have the upper limit and lower limit surfaces. 1. Can’t we simply offset the toleranced surfaces to get...
  16. Madhu454

    Dimensioning continuous extruded parts ?

    Hi, I was referring to one of the drawing. This is a continuous extruded part made up of plastic. Part is flexible in nature. Please refer to the attached drawing. The following questions came to my mind. 1) To establish datum-A, do we need to hold the part for entire length? (The length of the...
  17. Madhu454

    Cylindricity on threaded part?

    Hi All, I need your help; I was referring to one the old drawing. Please see the attached drawing where threaded feature as called as datum feature “A” and it is qualified with cylindricity callout. Is it appropriate to use cylindricity on the threaded feature? I felt which is wrong. Also I felt...
  18. Madhu454

    Cone ; Profile Measurement

    Hi All, I need a favour. Please see the attached drawing. (Drawing is created as per ISO std) Could anybody suggest me how to measure the "profile of a surface" which is applied for the cone surface. We don't have a sophisticated machines like CMM in our factory. Can this be measured using any...
  19. Madhu454

    Does secondary datum feature-B required?

    Hi All, Please see the attached drawing. 1) The Primary datum feature A is the cone surface. (Datum Axis and Datum Point can be derived.) As per the standard, 5 DOF are constrained by selecting the cone surface as datum. 2) I have choosed datum feature-B as the secondary datum, since it is...
  20. Madhu454

    Restaining : Secondary Datum Feature

    Hi All, Is that okay to restrain the seconadry datum feature to the satated force. As per my understabning, when secondary datum feature is reatined to the stated force, it may not make the sufficient contact with the datum feature simulator. the exactent of contact depends on the what is the...

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