Thursday, October 5, 2017

Siemens Nx Tutorial || Bolt and Nut with creation of thread manually|| Along with audio narration

Siemens Nx Tutorial - Bolt and Nut with creation of thread manually

Hello viewers in this tutorial, we are going to create a bolt and nut of ½ inch dia where we will create threads manually using a Unified National Fine (UNF) Thread profile of 1/20 inch pitch. We will create using equations so that by changing the dia, length and pitch the size of bolt and nut can be modified. To show how it can be done we will also create a bolt of 3/8 inch dia having a pitch of 1/24 inches by changing the parameters using the expression command. In a previous tutorial, we demonstrated how to create UNF Thread Profile.

Video Transcription

  1. Start a new model file using inch units.
  2. Fill the name of the file Bolt.
  3. Switch to ‘Tools Tab’ and activate ‘Expressions’ command.
  4. Create a new expression named D and fill ½ inches in Formula, click ok to exit from the command.
  5. Start a new sketch over YZ plane.
  6. First set some preferences of the software.
  7. Here in Drafting Preference in the Text Units under Dimension settings, set the decimal places of units to 5 and ‘Decimal Delimiter’ to the period instead of a comma.
  8. Draw a polygon and apply a vertical constraint on its this side.
  9. Apply a dimension of D*1.5 over here on this polygon and exit from the sketching mode.
  10. Extrude this sketch profile and in ‘End Distance’ field fill value D*0.634.
  11. Change the colour of the model using ‘Edit Object Display command available at ‘View Tab’.
  12. Edit the colour of the model and apply a custom colour by filling the values 247 in Red, 225 in Green and 182 in Blue input dialogue box.
  13. Create a new sketch over XZ plane of the model and draw a sketch using ‘Line Tool’ as displayed.
  14. Apply a dimension of D*1/8 over this line and an angle of 30° between both lines.
  15. The sketch is complete so revolve it and remove the material from the solid.
  16. Create a sketch, over this face of the model and activate Static Wireframe view mode.
  17. Draw a circle coincident to the origin of the model.
  18. Apply a tangent constraint between the circle and this edge of the model.
  19. Re-activate ‘Shaded with Edges’ view mode.
  20. Create another circle in the sketch and apply an offset dimension of D*1/16 between these circles.
  21. Convert this circle into reference geometry and exit from the sketching mode.
  22. Extrude this sketch and in Extrude dialogue box fill the ‘End Distance’ 1/64 and in offset option select Two-Sided.
  23. In offset distance at end value box, fill 0.25 inches and execute the command after reversing the direction of Extrude.
  24. Create a new sketch over following face of the model and draw a circle coincident with the sketch origin next apply a dimension D here.
  25. Exit from the sketching mode and Extrude this sketch up to 2 inches.
  26. Hide the visible of sketches and save the file.
  27. Apply a chamfer over the following edge of the model, having 1/32 inches of length and 45 degrees of angle.
  28. Create a new sketch over XZ plane.
  29. Activate Intersection Curve command and select following face of the model.
  30. Here you can see in selection filter Curve option is selected which means while making a selection only sketch curves will be selected.
  31. Select all the curve present in the sketch and convert them into reference geometry.
  32. Draw two reference lines in the sketch as displayed and exit from the sketching mode.
  33. Next, open the folder named UNF Screw Thread Profiles from your hard drive. Check the video description and Youtube Cards to find the files required to complete this tutorial.
  34. From here open file named ‘UNF Screw External Thread Profile’.
  35. Here edit sketch which is visible in front of you.
  36. Select these arcs and lines.
  37. Activate copy command from the right-click menu to copy the selected sketches to the clipboard.
  38. Exit from the sketch and switch back to Bolt file.
  39. Edit the last sketch we created and paste the sketch which is present in the windows clipboard.
  40. Activate ‘Profile Tool’ and add these lines to the profile so that it clearly intersect the solid created up till now in the file.
  41. Select the thread profile sketch after activating sketch filter as a curve.
  42. Activate Move Curve tool.
  43. First, verify that ‘Angle’ is selected in ‘Transform Motion’ type.
  44. Next, specify Axis Point as displayed.
  45. Then fill 180° and click apply.
  46. Now in Transform Motion type select Point to Point.
  47. First, specify ‘from’ point and then specify ‘to’ point as displayed.
  48. Select sketches to be moved and click ok.
  49. Exit from the sketching mode.
  50. Switch to Analysis Tab and activate Measure Distance Command.
  51. Measure the total length of the bolt as displayed, that is 2.3170 inch.
  52. Activate Helix Cure Tool from Curve Tab.
  53. In the X, Y, Z coordinate position of the curve, fill the last measured distance 2.3170 inches in X input field and rotate the curve by -90°.
  54. The diameter of the curve should be 0.5 inches, in pitch fill the value 1/20+0.001 and length of the curve should be 1.25 inches.
  55. In the start angle, fill a value so that start point of curve coincident with the UNF thread profile.
  56. Activate Swept Tool and first select the thread profile, next Helix curve as guides.
  57. Verify that ‘Orientation Method’ is selected as ‘Vector Direction’ and then define vector direction as displayed.
  58. Click Ok to execute the command.
  59. Hide the visibility of sketches and curves.
  60. Activate Subtract Tool, select bolt as target body and swept feature as a tool body.
  61. Execute the command and threads are created in front of us.
  62. Hide everything in the file except solid bodies.
  63. The file is complete so save it.
  64. Let us see how we can change the size of the bolt by changing some parameters using references command.
  65. We will change the dia of the bolt to 3/8 inches and pitch of threads to 1/24 inches.
  66. First, suppress Swept and Subtract feature because these features will not update automatically after changing the parameters.
  67. Activate Expressions command and change the value of D to 3/8 inches.
  68. All the formula values depending on this parameter will update automatically.
  69. Edit the Extrude (8) feature and change the End distance value to 1.5 inches.
  70. Open the UNF Screw External Thread Profile file and change the value of pitch to 1/24 from Expressions table.
  71. The whole sketch will update accordingly.
  72. Copy the sketch to the windows clipboard as we did earlier and switch back to bolt file.
  73. Edit the sketch where we placed the UNF thread profile earlier.
  74. First, delete the existing sketch and then paste the modified sketch.
  75. Do the same procedure as we did earlier to place the sketch at the appropriate position and exit from the sketching mode.
  76. Measure the total length of the bolt which is now 1.7377 inches.
  77. Edit the helix curve.
  78. In the X input field fill the measured value 1.7377 inches.
  79. Change the diameter of helix curve to 3/8, Pitch to 1/24+0.001 and length to 1 inches.
  80. Open the visibility of helix curve.
  81. Now delete the Swept feature and Subtract feature will delete automatically.
  82. Activate Swept tool and select UNF thread profile and helix curve as guides.
  83. Activate preserve shape option and specify Vector Direction as displayed.
  84. Click OK to execute the command.
  85. Next, subtract solid created by the swept feature from the bolt.
  86. The tool is not selecting the swept feature which means there is some problem with it so we will correct it.
  87. Edit the swept feature, here see the thread profile has not been selected properly.
  88. Select this arc which was missing.
  89. In body type select ‘Solid’ instead of a ‘Sheet’ and click ok.
  90. Now re-apply Subtract Command and it will work properly.
  91. Now we have modified the bolt successfully so save it with a different name.
  92. This is ½ dia inch bolt and this is 3/8 inch dia bolt.
  93. Now switch to ½ inch dia bolt and save as the file with the name nut.
  94. In this file, we will make some changes to create nut model which will save our time.
  95. Select all the features after the Revolve (4) and delete it.
  96. Edit this Sketch (1) and edit this dimension, change its value to D*(1+5/8) and exit the sketch.
  97. This change also reflects in Expressions Table.
  98. Next, we need to create a hole.
  99. To determine it’s dia we will check ANSI Internal Screw Threads Chart.
  100. Our screw size is ½ -20 so it’s minimum Minor Diameter is 0.4460 inches which we will use in creating a hole.
  101. Turn on the visibility of coordinate System from Show and Hide command available at the View Tab.
  102. Activate ‘Hole’ command and first define the position of the hole as the model origin.
  103. Fill the diameter of the hole which we got from the ANSI Internal Screw Threads Chart that is 0.4460 inches and in depth limit select Through Body option.
  104. Click ok to execute the command.
  105. Edit the extrude length value to D*0.884 inches.
  106. Apply a chamfer of 1/32 inches distance and 45° angles on the following edge.
  107. Create a new sketch over XZ plane.
  108. Activate Intersection Curve command and select following face of the model.
  109. Draw two more lines and convert all lines in the sketch into reference geometry.
  110. Exit the sketch and open the file of UNF Screw Internal Thread Profile.
  111. Copy the sketch from the file as we did earlier and switch back to the Nut file.
  112. Edit the last sketch we created and paste the copied sketch here.
  113. Add few more lines to close the profile and move it to the appropriate position.
  114. Exit the sketch and activate the Helix Curve tool.
  115. In the helix X, Y, Z co-ordinate fill the value of X to 0.442 + 0.00625 and rotate it to position the curve properly.
  116. Fill the value -180° in angle, 0.446 inches in diameter, 0.051 inches in pitch and 0.5 inches in length input box.
  117. Click Ok to create the Helix Curve.
  118. Activate Swept Tool and select the thread profile then select Helix curve as a guide.
  119. Specify vector direction and click ok.
  120. Subtract solid created with the swept tool from the main body to create threads.
  121. Hide everything in the file except solid bodies.
  122. Activate Clip Section view to examine the threads.
  123. Exit from the section view and save the file.
  124. Close this file and create a new assembly file named Bolt and Nut using inch units.
  125. First, add Bolt component in the assembly.
  126. Placement of the bolt will be at the absolute origin in reference to the entire part.
  127. Apply ‘Fix’ Assembly Constraint over it.
  128. Hide sketches and curves in the file.
  129. Change colour of the model as displayed.
  130. Now add Nut component in the assembly.
  131. Set the placement of the model to move.
  132. Drag the component to the appropriate position.
  133. Hide everything except solid in the file.
  134. Edit the Bolt component and open the visibility of Datum Coordinates of it.
  135. Do the same for Nut component.
  136. Align axis of Bolt and Nut using Touch Align Constraint.
  137. Hide everything except solid in the file.
  138. Move the Nut a little bit and save the file.




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