Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: elinah34
  • Content: Threads
  • Order by date
  1. elinah34

    Locking the position while using a linear slide

    Hello, How can I lock a linear slide position in a fast way? Is there a linear slide which provides the option of manually locking the slider position after making the required adjustments?
  2. elinah34

    A modular profile (item) construction - tolerances?

    Hello, This is the first time I draw a modular profile (item) construction. What type of tolerances (and values range) is acceptable and reasonable? I guess that size tolerances are OK, but what about the required precision? If I want profiles to be parallel to each other, can I require it and...
  3. elinah34

    Design for manufacturing - Laser Cutting or Water Jet Cutting technologies

    Hello, I want to allow the supplier to manufacture (at least contour cutting) the attached sheet metal by Laser Cutting or Water Jet Cutting technologies. Which type of corners is best for these technologies? Which one is impossible? Thanks,
  4. elinah34

    Item modular profile construction design - an advice is needed

    Hello, I had almost a final design (1.xt, added to this post) and suddenly there was a need to use other castors with another (bigger) interface. The new castor interface is very big, and from using only 1 screw I had to use 4 screws. The Item profile end couldn't connect to the new castor and...
  5. elinah34

    How to fix a planetary gear

    Hello, I am wondering how is connecting a planetary gear to the attached sub-assy is recommended? I used 2 brackets, but I am not sure it's ok.
  6. elinah34

    Failure of a bonded joint that has a thread

    Hello, I have a question about a thread which exists in a bonded joint. I am adding a simplified picture of such a joint, that we have some issues with: Please pay attention that the thread goes a little bit over the second lower bonded Ultem part. After manufacturing this joint (Including...
  7. elinah34

    Importance of dial indicator position while measuring

    Hello everyone, I watched the milling machine worker measuring the upper surface of the machined part while it was still on the milling machine. He didn’t really pay attention to the dial indicator posture/position relative to the part and/or machine. I wonder if there is no importance to the...
  8. elinah34

    Increasing a coefficient of friction between 2 surfaces

    Hello, A colleague told me about a problem they had and how they decided to solve it, and I would like to find out what you think about it. His crew designed a chamber (see a simplified picture below) that is expected to be flown and subjected to varied loads and vibration. After getting all...
  9. elinah34

    A CNC holder - material selection

    Hello, I design a holder that on the one hand will have an interface to the CNC base plate and on the other hand will have a direct interface to the machined part. I wonder which type of material the holder should be made of. It should be super precise (parallelism to the base plate, good...
  10. elinah34

    Helicoil in stainless steel parts

    Hello, I design a part made of 304 stainless steel. I am afraid of directly using its threads because of the risk of cold welding in case of misusing bolts that are also made of stainless steel. I thought about using helicoil with dry film lubrication, but have never seen such a soultion in...
  11. elinah34

    ISO standard - A parallelism of a plane to an axis

    Hello everyone, I wonder if I can require a parallelism of a plane to an axis. I am attaching a picture to demonstrate my question - look please at the geometric tolerance in a red color.
  12. elinah34

    bolted joint calculation of preload decrease as a result of members creep

    hello, I am trying to find out how to evaluate by calculation the anticipated preload decrease as a result of a member creep in my joint. Here is an illustration on the simplified clamped joint I tried to analyze: I know that my ULTEM 1000 member is likely to creep and lead to a preload...
  13. elinah34

    Calculation of the stiffness of a plastic member in a bolted joint

    Hello everyone, I guess you all know the familiar formulas for calculating stiffnesses of the bolt and the members in a classic bolted joint. Classic = when all the components (bolt and members) are made of metals (aluminum, steel etc.). But it becomes complicated in my case - a bolted joint in...
  14. elinah34

    Ultem 1000 failure criterion

    I started calculating the stress in a 6-32 female thread in ultem 1000 plate. I suddenly realized that I am using VON MISES equivalent stress that we usually use when dealing with metals that aren't brittle. What is the failure criterion in Ultem 1000? I know how to calculate the shear stress in...
  15. elinah34

    An air gap between helicoil and mating part

    Hey everyone, I have 2 mating parts, and the interface is a sphere surface. In the lower part there are helicoils (marked with red pen), and for creating an axisymmetric 120 deg chamfer for installing the helicoil there is a need to create a small planar face as shown in the picture (a small...
  16. elinah34

    Datum features that aren't perpendicular

    Is there an option of defining 3 plsnar datum features that aren't perpendicular to each other as datums? Sometimes there are cases in which the physocsl interfaces of the part aren't perpendicular, but still should be defined as datums since these are the functional interfaces and in addition...
  17. elinah34

    Envelop requirement

    Hello, In ISO Envelop requirement is by definition a perfect FORM at MMC condition. I couldn't figure out if it also limits the feature's form tolerance in any other case. For example, if I have a hole with a size dimension of 100+/-1 with E modifier - the form should be perfect at MMC, i.e 99...
  18. elinah34

    FREE BODY DIAGRAM

    Hey, I have a conceptual design, and I need to first check its potential strength. Here is a schematic picture of the conceptual design: I have a lifting bridge for lifting the weight through its interface which has 2 Shear pins for taking the shear. The Shaft/Hole fit (marked in purple in the...
  19. elinah34

    Welding method choice

    Are there any instructions how to choose welding technology (MIG, TIG, EBW, etc.) based on the relevant application? I am designing a structure that should be dynamically (vibrations) tested soon, and I originally instructed to use TIG method. The workshop prefers to use MIG welding. I wonder...
  20. elinah34

    SOME QUESTIONS REGARDING SHEET METAL

    Hello, I decided to read about sheet metal design and manufacture principles for improving my design. I have 2 questions I will be happy to be given answers to: 1. Bending orientation direction. In which case I can afford a larger minimum radius? 2. Second question is regarding spring back...

Part and Inventory Search

Back
Top