FreeCAD Tutorial Assembly 4 - Cylindrical Cam and Follower Mechanism & Animation (Assembly4)

there are St lights at both ends of the cam and the follower will reverse Direction after traveling the St lights the follower turns when the path change and there are two brers at the follower to eminate this motion let me start to show how to do it in Feast assembly 4 Create a new file switch to assembly 4 Create new assembly file create new body and the parts create new sketch use theault LCS s let pain phas dra Circle 60 mm diameter P it 240 create a new sketch on one C ping so tangle 5 mm by 4 mm 40 mm from the bottom 4 mm color heix Groove pit 40 mm height 160 use peit high angle window sketch on YC pain Jo rectangle also 5x4 it's a 36 mm from the top cut the groove 180° and check the reverse create another sketch on YC pin same to rectangle 5 by4 also 40 mm from the bottom cut the groove 180° it is reversed create a not a sketch on YC pain same draw rectangle 5x4 40 mm from the bottom kindor heix Groove 40 mm P 160 mm height p height angle see left handed so the cam is finished we have straight light at both ends cre a sketch on XY pin 30 mm diameter 30 mm reverse and now the sketch on XY pain 30 mm diameter in 60 change C to 240 change the color to light hide the cam go back to assem 4 Create a new body and new sketch use def for LCS pink face draw two construction l 16° go to us 63 mm 60.5 draw eyes to join the ads back to Parks design P it amm symmetric so the origin create pain s x c pink pH change AIS to y turn it 10° create a new sketch on the data pain draw Circle 0.6 mm just create location for the LCS change C to minus 31 81 mm create another sketch on XC pain draw shle 6 mm change C to minus 31 reverse pet it amm change the color to burgundy hide the origin hide the data pain appil to corners hi the follower go your S4 create a new body create a new sketch use default LCS pink face draw a circle 3.5 mm P it vmm create another sketch on XY pain Jo Circle to m in change C to Fe 1.5 app P fil to Edge 0.5 change the col to burgundy hide the roller go to assembly 4 Create a new body create a new sketch same to theault LCS so 10 go make symmetric about the center 10.5 mm 10 mm symmetric create new sketch on YC ping 6 mm diam to two C to 15 so8 s F Corners change color to Yellow hi the I add the the CLE to 7 mm diameter go to S4 cre new body create new sketch use default LCS pink face 10 mm p in 300 change color to Ember hide the item go to S 4 Create new body create a new sketch use the for LCS pink face so a Tango 100 mm 5 f 1 m is symmetric about the center 830 mm select the face create a new sketch dra tangle 30 mm P 850 see at the face create a new sketch so two circles 30 mm and 10.5 mm 90 mm 48.75 between two circles socket it 31 mm see that pet and po cat mirror if iate your corners change the color to Green hide the base go to as MP4 s the follower create new LCS s Circle concentric we use default LCS for the r and for the RO so the base three LCS that the upper hole concentrate new LCS sitting at the lower Circle at this for the cam concentrate see cam new LCS see that the circle concentric so the pay cre new LCS Signet the sideo concentric and variables angle H1 H2 change angle to zero insert a cam pattern assembly origin center of the cam so now I can use a cam as a reference for creating the skeleton sketch create a new body under the assembly create a sketch model LS task CET XC draw vertical line make it 60 the length doesn't really matter 26 mm to the origin select variable. X1 it is the position for the follower seeet sketch duplicate A Sketch rename it move it to assembly change the axis to X Change it to minus 10° for the second one change the axis to X make it 10° so now to sketch are 20 degrees above it is the path for the follower change the position of the cam to 80° to match the position of the first sketch for the second sketch change the variable to X2 the pit of the Helix is 40 mm height is 160 mm initial height is 40 mm plus 2 mm to the center of the groove the maximum height of the path is a 202 is 40 mm + 160 + 2 mm the total range of the rotation is 3,240 De for rotation of 1° the height increase by 40 mm / by 360 for the straight line portion at the top the height is 202 and at the bottom is 42 when the follower is coming down the height is 202 - 40 * angle - 1620 / V60 translate this into conditional Expressions as highlighted by yellow the combined conditional expressions for X1 is highlighted in blue X1 and X2 are 20° apart substitute angle by angle minus 20 into the expression it is the conditional expressions for X2 highlight in green copy and paste the conditional expansions for X1 and X2 change the point size of the sketch to 20 the Ben is from 0o to 3240 step size 10 for the cam change the angle of the LCS to minus variable to angle T step size to 30 on the animation so you can see two do is moving along the Helix curve hide the cam select the body the path create LCS for two rulers at the fourer S at the vertex translate or create LCS C the vertex transmit origin UT par design create datm line see that the vertic pass through two points go back to assem before b a l o CS along the DAT line see that line select the vertex left come up that I can select so I just select okay for now then go back to the LCS to addit it and it works usually select the DAT line so s c tangent to Edge as the LCS Creator in the body will not be visible under the parent assembly so I I need to import the datm object then I can synect the LCS from the parent assembly import datm object insert rollers half 1 M insert the second rer PA to m insert the forward along the DM line follow p in the S PA nine adjust the Y position as I cannot adjust by small angle he so just K okay first go to the follower go to the LCS change AIS to X Change it to - 9° and C to minus 2 the position is okay when the animation so the follower moves along the heix Curve so the motion looks good insert the pace use origin and the hole for the C change C to minus 30 insert the world attach it to the base hide the base insert the pain on top of the follower it cannot be attached to the forarm as it move but it w turns so attach it to the origin assembly origin change y to 44 change it to 33.8 so go to the LCS of the pay in the X Direction make minus X1 + X2 / 2 it is at the middle of two rollers so the movement will be along the horizontal Direction but won't turn hi the sketch when the animation so inve along the path and reverse at the top it looks good and it's reversing if you find this video interesting Please Subscribe and give it a like thank you for watching

Channel: KK CAD

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Id: gj72eC6ErKM

Length: 47min 31sec (2851 seconds)

Published: Thu Apr 18 2024