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M MECHENG250F11 CAD D Lab 2 I. In ntroduction You s should now b be familiar wit th creating simple solid pa arts by first cr reating a sket tch (simplified d 2D representation of the e part) ) and then cre eating 3D fea atures using b basic features s such as ext trusion; simila arly you may also use revolution, fillets and c chamfers. In this lesson, we will go ov some fun w ver nctions that c be used to create a m can more comple part and/or ex make e your lives ea asier, and you u will learn ho ow to remove e material fro om your part. . II. S Sketching g 1 Start Solid 1. dWorks 2 Create a n 2. new Solid Par rt a. So olidWorks > F File > New b. Pa art c. OK O 3 You will se 3. ee the command manager r as usual. (CTRLN N) 4 Change th 4. he Unit System m to IPS(Inch h, Pound, Second) a. So olidWorks > T Tools > Options b. Document Pro operties Tab c. Units elect "IPS" for unit system ms d. Se 5 Save the f 5. file you just created (and s save frequent tly to avoid lo osing your wo ork!) 6 Click on "Extruded Bos 6. ss/Base" and choose "Righ ht Plane" as yo our sketching g plane 7 Create a " 7. "Corner Recta angle" on the e plane. 8 Click on "point" and ad 8. dd a point on the left edge e of the rectan ngle you just created. 1 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 9 Select bot 9. th the point y you just creat ted and the le eft edge by ho olding down `Shift' key an nd clicking on them. On the e left ribbon n, under "Add d Relations", click on "Mid dpoint" 1 Select the 10. e midpoint of the left edge e and the orig gin. Add "Coin ncident" relat tion. 1 Dimension the sketch a 11. as follows: 1 Create a "Corner Rect 12. tangle" by choosing a poin nt on the righ ht vertical ed dge and some ewhere inside the existing g rectangle d corner is aligned with th he origin. Be careful not to o a. Constraints will be automatically set up if the second onstrain your r sketch unint tentionally co b. Click on "Point t" and create a point on th he left vertica l edge of the second recta angle elect both the e point you ju ust created an nd the edge it t is and add " "Midpoint" re elation c. Se d. Se elect the orig gin and the midpoint, and a add "Horizon tal" relation e. Define the wid dth of the second rectangle e to be 1 inch h 1 This part is created as an arm that can attach to 13. o an axle (the e drawing of t the axle is sho own as below w), the second d e slot that will house the a axle. The axle e has a sectio on in the middle that has 2 2 rectangle was created to define the urfaces. Those surfaces will mate with t the top and b bottom edge o of the second d rectangle. parallel su 2 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 a. What should b W be the height of the second d rectangle? b. Th he axle is 0.25 inches in diameter and 0.03 inches h have been tak ken off from the top and t the bottom to o cr reate the parallel surfaces s. Therefore, t the slot need ds to be 0.25 0.03*2 inche es tall to acco ommodate the e midsection of the axle. m c. Use "Smart Dim mension" to d define the he eight of the re ectangle. Type in 0.250.03 3*2 in the Mo odify dialogue e tically evaluat tes the expre ession and set ts the height t to 0.19 inche es. Pretty cool, box. The program automat right? 3 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 1 The sketch has intersecting edges, s 14. so we can't ex xtrude yet. W We need to make the sketc ch one closed d shape first. a. Click on "Trim Entities" elect "Trim to o Closest" b. Se c. Click once on t the edge the t two rectangle es are sharing g i. Nothin ng will seem t to have happe ened dge again d. Click on the ed he edge disap ppears e. Th i. Why d did you need t to trim that p part twice? 1 Choose "P 15. Power Trim" under "Trim E Entities" options a. Click on the top edge of the e first rectang gle. M sor to one side (but not beyond the end dpoints of the e edge) b. Move the curs c. Th he edge will b be divided int to two section ns, one which h is blue and t the other which is orange d. Click range segmen nt remains, w while the blue segment is g gone i. The or ii. Note t that if you go o beyond the endpoints w with the curso or and click, the line is extended to that point ( (you can see t the orange se egment exten nded to wher re the line will be extended d to) ownward arro ow under "Tri im Entities" a and select "Ex xtend Entities s" e. Click on the do i. Click o on the remain ning segment of the top ed dge ii. The ed dge will exten nd to complet te the shape o once again f. Th here are othe er options fo or the "Trim E Entities" func ction. Feel fre ee to play aro ound with th hem and draw w ad dditional sket tches to use t the function a as you see fit. . g. Once ready to move on, come back to th O he following s sketch 4 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 III. Solid Par rt Extrusio on 1 Click "Exit 16. t Sketch" in th he command ribbon a. Th he view will s shift to a trimetric view and a preview o of the extrude ed part will appear i. We wa ant to make the arm as w wide as possi ble. How wid de can we make it withou ut making the e arm an nd axle not fit t together? (H Hint: refer to the drawing of the axle on n the previou us page) b. On "Property M O Manager", un nder "Directio on 1", set "En nd Condition" (drop down m menu) to be " "Mid Plane" c. Click the green n check mark 1 Let's spec 17. cify the mater rial to be AISI 1035 Steel (S SS) a. Right click on " "Material" in the design tr ree b. Se elect "Edit Material" c. Se elect "AISI 10 035 Steel (SS)" " under the Steel tree d. Click "Apply", t then "Close" 5 TheUniversityofMichigan
MECHENG250F11 CAD Lab 2 IV. Removing Material: Holes 18. There are three primary ways you can create holes a. Create circles in the original extrusion within the boundaries of the square (bad) b. Create an extruded cut and sketch circles of the appropriate size (ok) i. Just because you can design a hole that is 0.12345 in diameter does not meant that you will be able to find a drill in the shop that can create that size c. Use the "Hole Wizard" to create standard sized clearance or tapped holes (great) i. Always use standard size holes if you can ii. A clearance hole allows an appropriately size screw to pass through without interfering iii. A tapped hole is threaded and engages the screw's threads 19. "Hole Wizard" is a powerful function to create standard size holes. Since the axle has clearance hole for a size 2 screw, we should create holes for the same size screw on the arm to fix them together (You can learn more about the drill/tap sizes from: http://www.efunda.com/designstandards/screws/tapdrill.cfm). a. Click on the "Hole Wizard" icon in the Feature command ribbon b. Under "Hole Type" i. Hole Type: Countersink 1. Most screws and bolts have heads that act as the handle while they are being installed 2. In most cases, the head has a bigger diameter than the screw and is inevitably left on the outside surface after being screwed in 3. Countersinks and counterbores are additional removal of material which enables the heads of the screws/bolts to rest inside, hence making them flush with the surface 4. Countersinks are used for conical heads (a.k.a. flathead) and counterbores are used for most other types of heads ii. Standard: Ansi Inch iii. Type: Flat Head Screw (100) c. Under "Hole Specifications" i. Size: #2 ii. Fit: Normal 6 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 d. Under "End Co ondition" i. Choose "Up To Nex xt" Positions" tab at the top of f the "Hole Sp pecification" d dialogue e. Click on the "P i. Change the view to o "Top View" (CTRL5) 2 holes ii. Place 2 iii. Sketch h a line that co onnects the c centers of the e two holes iv. Constr rain the line to be "Horizon ntal" if it is no ot v. Right c click on the lin ne, click "Sele ect Midpoint" " vi. While holding shif select the "Right Plan from Part Tree and ft, e ne" choose e "Coincident t" vii. Finally y add dimensions as shown n on the right t viii. Click o on green chec ck mark to ma ake the holes final 2 Now we have holes on the top of the slot and on the axle but the scr 20. o f d e, rew can't go hole on the bo ottom of the through the whole assembly to secure it. We need to make h s can go thro ough the axle and hold the e assembly in n place. Click slot so that the screws Wizard" on "Hole W a. Under "Hole Type" Type: Straight Tap i. Hole T ii. Standa ard: Ansi Inch h iii. Type: T Tapped Hole " b. Under "Hole Specifications" #256 i. Size: # ondition" c. Under "End Co i. Choose "Up To Nex xt" Positions" tab at the top of f the "Hole Sp pecification" d d. Click on the "P dialogue i. Change the view to o "Bottom Vie ew" (CTRL6) 2 holes ii. Place 2 iii. Rotate e the view so that the prev viously placed d holes are als so visible iv. Select the center of f the newly placed hole an nd a round ed dge of the pre eviously place ed hole ons", select "C Concentric" v. Under "Add Relatio vi. Repeat ivv for the remaining pa air of previous sly & newly p placed holes 7 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 vii. Click o on green chec ck mark to ma ake the holes final 2 There are 21. e 3 sections of f material tha at each of the e two screws h ough has to go tho a. Why did we cr W reate tapped hole at the bo ottom? b. What would ha W appen if no h holes were tap pped? c. What would ha W appen if all of f them were t tapped? 2 Remembe 22. er the plate w we created on n CAD1? We w would like to have some h holes on that plate as well. Open up the e file from l last CAD lab. If you don't h have that file, you should be able to create a 2.75" by 2.75" squa are plate with h thickness as 0.25" in a minute. 2 We will us 23. se the Hole W Wizard again t to have four holes on the plate. You sh hould try do the following steps on your own, since you just lea arned how to use Hole Wiz zard. elect the "Hole" icon unde er "Hole Type e" a. Se b. Note Standard d: "ANSI Inch" " crew Clearanc ces" c. Note Type: "Sc pecify "Size" under "Hole S Specifications s" d. Sp i. ormal ii. Fit: No 8 Th heUniversity yofMichigan n
M MECHENG250F11 CAD D Lab 2 e. Sp pecify "End C Condition" i. "Throu ugh All" f. Click on the "P Positions" tab at the top of f the "Hole Sp pecification" d dialog elect the BOT TTOM surface e of the solid part (NOT the e "Top Plane" " datum) g. Se i. Note t that it will cre eate a hole wh here ever you u clicked h. Create three m more holes so omewhere on the bottom s surface that d do not coincid de with any p points i. j. w" (CTRL6) Change to the "Bottom View ter Rectangle e" sketch feat ture and crea ate a rectangle centered o on the origin t that is smaller Click the "Cent han the perim meter of the p plate th k. Make one of the sides 2in and constra that side with a perpe M t n ain endicular side to be equa like before al, e when we creat w ted a square l. Yo ou may have an extra hole e at the cente er, right click o on the center r of the hole, and choose " "Delete" corners of th m. Hold shift and click on a cen nter of one of f the holes an nd one of the he square rom the "Add Relations" d ialog i. Select coincident fr r corners and holes ii. Repeat this with the three other n. Click on the green check ma ark for the co onstraints o. Click on the green check ma ark for the Ho ole Positions p. Yo ou should now have the fo ollowing part: 9 TheUniversity h yofMichigan n
M MECHENG250F11 CAD D Lab 2 24. Click "Extr ruded Cut" in n the Feature command rib bbon a. Se elect the top surface of the plate b. Go to the top v view (CTRL5) ) oincident with h any other p point c. Create a circle that is not co d select the circle center an nd the origin d. Press shift and i. Add a coincident re elation Smart Dimens sion" icon and d select the ciircle e. Click on the "S i. Specify y a diameter of 0.5" f. tch" Click "Exit Sket elect "Throug gh All" for Direction 1 g. Se h. Click the green n check mark i. ou should now have the fo ollowing part: Yo 10 ...
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- Fall '09