- A Typ 10 180 Nomi Prebe Design A Fourtar Linkage To Move The Object Through The Three Positions Are In Figure Below 1 (48.77 KiB) Viewed 23 times
- A Typ 10 180 Nomi Prebe Design A Fourtar Linkage To Move The Object Through The Three Positions Are In Figure Below 2 (70.81 KiB) Viewed 23 times
- A Typ 10 180 Nomi Prebe Design A Fourtar Linkage To Move The Object Through The Three Positions Are In Figure Below 3 (70.81 KiB) Viewed 23 times
- A Typ 10 180 Nomi Prebe Design A Fourtar Linkage To Move The Object Through The Three Positions Are In Figure Below 4 (52.63 KiB) Viewed 23 times
Problem: Design a fourbar linkage to move the object through the three positions given in figure below (See figure- next page.). If necessary use different moving pivots other than the ones given. Follow the procedure described in Example 3-6 of Reference [1]. To limit its motion to range of positions desired, making it a six-bar. All fix pivots should be on the given base. Present your solution as bounded file. . Use an A-3 paper and drawing equipment to redraw all three given positions (that is, the three positions of AB or CD or EF, etc. as lines only), using an appropriate drawing scale factor, (e.g., K = 2mm/mm.) [10 pts.) b) Use the steps as given in Example 3-6 to determine the three design positions. If the fixed pivots of the fourbar, in your first trial, do not fall within the specified fixed plane, use alternative moving pivots, such as E F.E.F. EF, on the link and try again. [30 pts.] You will repeat the steps as described in Example 3-6, until you locate the moving pivots 0 and 0 on the base. Give draft of each trial on a separate A-3. [30 pts.) Draw the figure again (similar to Figure 3-9c, but before the driver dyad added) and add a driving dyad. Note that, the third fixed pivot 06 must also be located on the base. [30 pts.) Construct a cardboard model and check its function in order to be sure that it can get through all three positions (from initial to final position) withot encountering any limit (toggle) positions. (For 30 % extra points.) [ 30 pts.) Background: Three Position Synthesis with alternative Moving Pivots It is common for the designer to have some constraints on acceptable locations of the fixed pivots, since they will be limited to locations at which the ground plane of the package is accessible. While the moving pivot points A and B (or C and D) may have some particular location in the plane defined by the mechanism's function, the alternative points E and F can be anywhere on the link (coupler link-3), thus creating infinitely many solutions to this problem.
Before attemting any solution: Read all related sections from (1) FIVEN FIGURE • In the figure, vectors, A,B, stands for position-1, A,B for position-2, and AB, for position-3. • 0, 0, and 0, are the fixed pivots (to be determined on the base • Computer aided drawing and design is also accepted. • If the size is too big or too small for A3, rescale the original data. (Scale K = ? mm/mm.) Dimensions are given in mm. Thus, the positions of each joint are given on the figure. Locate these points first, and draw the figure again by choosing an appropriate drawing scale, k. Use A3 size papers in your drafts as well as for your final design). Note: When you use moving pivots you may name them as A,B,A,B., AND A,B, (as shown) or alternatively as CD, CD, CD; as well as EF, EF, EF. Whatever label you use you must show them on the figure(s). Do not show the dimensions and/or all those construction lines of your scaled drawing of the figure given below, but give its scale, ks. The pink region must be shown since it is your frame where the fixed pivots must be placed. 120 145 sor 120 18) 167 almin