producing threads in a screw

8/3/2019 Producing Threads in a Screw

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PRODUCING THREADS IN A SCREW

Produce the following threads for part of a screw.

38 mm

Before start modeling, set the unit to millimeter Newton Second (mmNs):

Edit – Setup - select Units – in Systems of Units tab, select mmNs, then click Set – select

interpret dimensions, click OK , Close, Done.

Sketch cylinder for screw

Select Front datum, click Sketch Tool, click Sketch, click Close.

Create vertical and horizontal centerlines through Spin Center (origin point) as shownin Figure 1.

Figure 1: Making centerlines.



Sketch a rectangle and set the dimensions as shown in Figure 2.

Figure 2: Sketch rectangle.

Exit from sketcher by clicking √ (tick) icon. Click Save View List and select Standard

Orientation as shown in Figure 3.

Figure 3: Save view list.



Revolve the section to generate cylinder (Figure 4) using Revolve Tool and click √ to

confirm/ apply.

Figure 4: Cylinder for screw.

Making Threads in Screw

Click Insert – Helical Sweep – Cut, then Menu Manager appears as

Figure 5: Menu Manager for setting up of sketching.

Click Done (Figure 5), select Front datum for sketching plane. Click Okay and then select

Default.



Figure 7: Reference point for cutting section.

Please Zoom In the region around the reference point as indicated in Figure 7 to have the

following screen as

Figure 8: Reference point after zooming in.

Create horizontal and vertical centerlines through the reference point shown in Figure 8.

Then create another vertical centerline on the right hand side of the reference point and next,

create two horizontal centerlines underneath the reference point. Create two (2) slanted

centerlines through the reference point and point A as shown in Figure 9. Modify the

dimensions according to the specified dimensions shown in Figure 9. The dimensions are

corresponding to the standard sizes in ISO.



Create lines from point A to B, B to C , then C to reference point as the cutting section.

The details of the threads may be summarized as follows (also see Figure 10 and Table 1):

- Major diameter : 20 mm

- Minor diameter : 18.16 mm

- Pitch : 1.5 mm

- Crest : 0.2 mm (appropriate user defined)

Click √ to apply the required values, click Okay, and click OK . The threads will be

generated.

Figure 9: Detailed dimensions for cutting section of the threads.

producing threads in a screw

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