Kẹp giấy ma quái (Ghost Clip) in 3D

Summary

This 129.37x59.74x1mm ghost clip is great as a decorative paperclip, or as a bookmark! Customize it by adding your own initials, and printing it in any color you want! Useful for reading, school, and work, this clip will make your life significantly easier while making your work space much more exciting! I worked with Jusenly Lorthe on this project (@jusenly_4595410).

Objective

Work with a partner to create two identical, exact replicas of the ghost clip on Solidworks, efficiently using the Mirror and Offset Entities tools at least once each. The two projects must be identical, created in the same way click for click. The sketch must be fully defined with zero error messages and have detailed but efficient dimensions as well as relations that decrease the number of necessary dimensions.

Assembly/Construction Instructions

Constraint Box

1. Begin a new sketch on the front plane. Set dimensions to millimeters, grams, seconds.

2. Using the center rectangle tool marked for construction, create a constraint box centered on the origin with construction lines set to midpoints of sides. Use Smart Dimensions to make the box 129.37mm tall and 59.74mm wide.

Bottom Arcs

1. Using the three-point arc tool, create three connected arcs along the bottom edge within the constraint box. The left endpoint of the left arc and the right endpoint of the right arc should be coincident with the left and right sides of the constraint box. Using manual relations, apply the tangent relation between the bottom of each arc and the bottom edge of the constraint box. Select the center of the middle arc and the center vertical construction line and apply the coincident relation.

2. Hold down the Control key and select the centers of each arc. Apply the horizontal relation to all of them. Separately, apply the horizontal relation to all of the endpoints of the arcs.

3. Use the line tool marked for construction to draw the radius of each arc. Apply the parallel and equal relations to all three radii after selecting them while holding down the Control key. Use Smart Dimensions to set the horizontal distance between the endpoints of the radius of the middle arc to 8.35mm.

4. Use the line tool marked for construction to draw three lines connecting the endpoints of each arc. Use manual relations to set all three lines equal and parallel.

Mouth

1. Using the line tool, make a line in the left side of the constraint box and another in the right side. The midpoint of each line should be near but not on the horizontal construction line that connects the midpoints of the constraint box’s vertical sides.

2. Select both lines while holding down Control, and apply the vertical and equal relations to both. Apply the horizontal relation to the top points of each line. Use Smart Dimensions to set the distance between each line and the nearest vertical side of the constraint box to 14.97mm.

3. Using the tangent arc tool, connect the bottom endpoints of each line. Make sure the tangent arc opens upward.

4. Hold down the Control key to select the two vertical lines and the arc and mark them all for construction.

5. Keeping the two lines and arc selected, use the offset tool in both directions and with capped ends to make the mouth bigger. In the offset menu, set the distance between the edge of the offset mouth and the inner construction line to 3.05mm. Delete the gray dimension that appears after you offset the mouth. Using Smart Dimensions, set the distance between the bottom of the offset mouth and the bottom edge of the construction box to 22.32mm. Set the distance between the top of the mouth’s left vertical construction line and the top edge of the construction box to 49.68mm.

Eyes

1. Use the circle tool to draw a circle near but not on the center of the top left quarter of the constraint box. Using Smart Dimensions, set its diameter to 11.84mm.

2. Use Smart Dimensions to set the distance between the left edge of the constraint box and the center of the circle to 16.95mm.

3. Use the mirror tool to reflect the circle over the vertical construction line in the center of the constraint box.

Top Triangles

1. Draw the top two sides of six triangles using the line tool, with the top vertex on the top edge of the constraint box. The bottom left vertex of the left triangle should be on the left side of the constraint box and the bottom right vertex of the right triangle should be on the right side of the constraint box. Adjacent triangles should be connected at their bottom vertices.

2. Hold down the Control key while selecting the two sides of each triangle, and apply the equal relation to all of them. Make sure all of of the left sides are parallel, and all of the right sides are parallel.

3. Select the bottom endpoints of every triangle while holding down the Control key, and then use manual relations to apply the horizontal relation to them.

4. Using Smart Dimensions, set the vertical distance between the top and bottom of a triangle to 8.25mm, and set the vertical distance between the bottom of a triangle and the center of a circle to 19.44mm.

Sides

1. Connect the bottom left vertex of the farthest left triangle to the left endpoint of the left arc on the bottom using the line tool. Do the same with the bottom right vertex of the farthest right triangle and the right endpoint of the bottom right arc.

2. If the automatic equal and vertical relations do not appear for these lines, apply them manually. Use Smart Dimensions to set the length of the lines to 112.02mm.

Extrude

1. Click the blue button at the top right corner of your screen to exit your sketch.

2. Select your sketch in the Feature Manager Tree and select Boss Extrude in the Features tab.

3. Change the dimension in the menu to 1mm and click the green check mark.

Engrave

1. Click the top face of your extruded ghost.

2. On the Sketch tab, select “Sketch” to start a new sketch.

3. Draw a horizontal construction line connecting the left and right sides of the mouth about ¼ of the way down. The line must only be coincident with the vertical straight edges of the mouth, not the offset construction line.

4. Select the line and click the text sketching tool.

5. Set the font to Impact using the “Use document font” box. Click the center align button and increase the size of the letters until they fill most of the tab (approximately 15mm). Type your first initial in the box provided.

6. Repeat steps 3-5 for your second initial with the horizontal construction line about ¾ of the way down. Make sure the initials are stacked vertically.

7. Save your sketch by clicking the blue sketch icon in the top left of your screen.

8. Select the sketch in the Feature Tree, and select Extruded Cut in the Feature tab.

9. Change the dimension in the Extruded Cut menu to 0.495mm and click the green check mark.

Design Choices

As part of our planning process for this project, we traced a ghost clip onto graph paper and added the dimensions we wanted to use in Solidworks. We used this drawing to write a plan for our sketch that included the same dimensions as well as the specific tools we were going to use for each step. However, while working on the project, we made a few adjustments either to improve the ghost clip or to simplify our design process.

While working on the mouth, we used three-point arcs at first, but then realized that it would be easier to move the mouth and change dimensions if we used tangent arcs instead.

In our original plan, we were going to use Smart Dimensions to measure the distance between the endpoints of each bottom arc as one third of the width of the construction box. However, as we were sketching it, we realized it was easier to draw construction lines and set them equal and parallel. We also added congruent and parallel construction lines for the arcs’ radii and made them equal at 8.35mm to ensure that all of the arcs were congruent.

While we were writing the construction outline, we had multiple measurements between lines and the edge of one of the eye circles, but we found that in Solidworks, dimensions with other geometry can only use the center of circles. We changed the distance between a circle and the nearest vertical side of the constraint box from 11.03mm to 16.95mm for the distance between the vertical side and the center of the circle. We also changed the distance between a circle’s edge and the bottom of a triangle from 13.52mm to 19.44mm for the distance between the center of a circle and the bottom of a triangle.

The horizontal dimensions we had planned to use for various parts of the ghost clip did not add up to the width of the clip, so we ignored the dimension of 23.87mm we were going to use for the distance between the sides of the mouth.

We were going to add a dimension of 9.8mm for the space between the tops of adjacent triangles, but we realized the measurement of 8.25mm for the height of each triangle was enough.

We were going to measure the vertical distance between the top part of the bottom curve of the mouth and the top edge of the construction box as 93mm, but it was not necessary because we had enough other dimensions.

While comparing our sketches to the physical ghost clip, we noticed that the three bottom arcs were slightly too large, so we changed the horizontal length of the radii we had drawn to 8.35mm instead of 8.42mm.