ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE 1 ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE Pro/ENGINEER Wildfire 2.0 Dr. Herli Surjanhata A component can be placed as a connection within mechanism assembly. The following six joint types are available: Pin Joint 2 Cylinder Joint Planar Joint 3 Slider Joint Ball Joint 4 Bearing Joint PREPARE THE PARTS FOR MECHANISM Download the part files eccentric_mechanism.zip. There are eleven parts that make up the mechanism: 1 arm.prt 7 eccentric.prt 2 base.prt 8 post.prt 3 bushing.prt 9 shaft.prt 4 clip-1.prt 10 washer-1.prt 5 clip-2.prt 11 washer-2.prt 6 link.prt 5 arm.prt base.prt bushing.prt eccentric.prt 6 post.prt shaft.prt clip-1.prt clip-2.prt 7 washer-1.prt washer-2.prt link.prt CREATE AN SUB-ASSEMBLY eccentric_asm.asm Sub-assembly called eccentric_asm.asm will be consisted of six component parts – eccentric, shaft, clip-1, clip-2, washer-1, and washer-2. Create a new assembly called ECCENTRIC_ASM 8 Bring in eccentric.prt and constrain it at default location by picking . Pick , then Open eccentric.prt. The assembly is shown below. Next, place shaft.prt to the assembly. Pick , then Open shaft.prt. Pick the axis of the shaft, then select the axis of the center hole of the eccentric. 9 Pick the surfaces as shown below. [...]... place it in the groove of the pin of arm part – see figure below 21 Place washer-1.prt right behind clip-1 – see figure below 22 The resulted assembly is shown below 23 CREATE AN TOTAL ASSEMBLY eccentric_ mechanism. asm Click , Enter the name of eccentric_ mechanism OK Click Then open sub-assembly base_asm.asm and assemble it at default location by selecting 24 Open sub-assembly eccentric_ asm.asm and... surfaces Be sure to enter 0 when prompted with offset distance to flip the If necessary, click orientation of the shaft The resulted assembly is shown below 10 Click below Then open clip-2.prt Place clip-2 in the groove of the shaft as shown Place washer-2.prt right behind clip-2 as shown below 11 Open clip-1.prt and place it in the groove of the pin of eccentric part – see figure below 12 Place washer-1.prt... then Open Pick eccentric_ asm.asm Pin connection will be created! Click the Connect tab for Connections Be sure to turn on the datum axis only 25 For Axis alignment, align the axis of shaft A_2 with axis of the bushing A_2 Select Move tab, and choose Translate Pick eccentric_ asm then move it backward as shown in the figure below 26 Click on Place tab For Translation, select the surface of eccentric, then... select the front surface of the bushing as shown below 27 Pick this surface of eccentric part Then pick the front surface of the bushing 28 Click back on Axis alignment, and be sure that under Component Reference, the selection as indicated in the figure If not, re-select both axes of the shaft and bushing The orientation as shown in the figure on the left is incorrect The eccentric assembly must be... interference will be measured, then fixed by changing the dimensions of the part that causes the interference Click Click to turn on the datum planes display Then select -> Pick the front surface of eccentric part as sketching plane, and then pick assembly TOP datum plane as Reference for Top Orientation – see figure below 31 Pick front surface of eccentric part as sketching plane Click on Sketch Pick the... reference 32 Draw a rectangle as shown on the left figure The dimensions of the rectangle do not matter Most important the rectangle should cover the area of the model that will be removed to Click continue Choose thru all cut Then click Turn off ALL datums display 33 Change the view to the RIGHT side view Zoom in to the interference area of the parts There are interference between clip-2, bushing, and washer-2... bushing into the hole located on the right of the base Hint: Use Repeat option of the assembly Edit -> Repeat etc , and open post.prt Place the post at the most left hole in the base – see Click figure below 18 Perform the Global Interference check and make sure there are NO interference 19 Save the assembly CREATE AN SUB-ASSEMBLY arm_asm.asm Click , Enter the name of arm_asm OK 20 Click Then open arm.prt... orientation of the assembly 29 Click OK Perform Global Interference check of the assembly Analysis -> Model Analysis 30 Choose Global Interference under Type Click There are interference parts in the assembly, and they must be fixed before proceeding Close the Model Analysis dialog box To investigate the interference, the assembly model will be cut at location where the interference occurred The amount of. .. resulted assembly is shown below 14 Perform Global Interference check of the assembly Make sure there is no interference in the assembly Analysis -> Model Analysis Choose Global Interference under Type Click There are NO interference parts in the assembly Save the assembly 15 CREATE AN SUB-ASSEMBLY base_asm.asm Click , Enter the name of base_asm OK Click Then open base.prt and assemble it at default... view to the RIGHT side view Zoom in to the interference area of the parts There are interference between clip-2, bushing, and washer-2 These interferences can be avoided by extending the left portion of the shaft – from the left face to the groove We will measure the length distance needed to be extended 34 Analysis -> Measure Pick two edges indicated by red in the figure on the left The resulted distance . ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE 1 ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE Pro/ENGINEER. THE PARTS FOR MECHANISM Download the part files eccentric_ mechanism. zip. There are eleven parts that make up the mechanism: 1 arm.prt 7 eccentric. prt