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1.25 S SOLIDWORKS TOOLBOX HOW TO

Create another Sketch on the rear face of the thread and Extrude another circle equal to the outer diameter of the pipe to the third point on the reference sketch.This is a result of the chamfer on the die during fabrication, which creates imperfect threads at the and of the thread. This creates a lead-in chamfer at the end of the thread. Extrude the circle up to the Front Face of the thread with a 25° taper.Create a Sketch on the rear face of the extrusion and draw a circle equal to the outer diameter of the pipe.Cut-Sweep the thread profile about the tapered helix.Truncation, f: Flattening of thread crest or root. Width of Flat, F: Width of the flat caused by truncation, or shortening of the thread crest or root. Height of Sharp V Thread, H: Height of fundamental triangle created be thread profile. Use the table below to define the thread profile, this includes:.Note that in NPT threads, roots and crests of the thread are truncated with a square flat. The angle between the sides of the thread is 60° when measured with a line bisecting the angle, perpendicular to the center axis. On this sketch we will define the thread profile. Create a Sketch on the Right Plane which intersects the helix created.

087.Ĭheck “Taper/Helix” and input a 1.79° taper going inwards. this 1-1/2 NPT Pipe Size at 11-1/2 Threads per Inch will have a pitch of 1÷11-1/2 or. Pitch, P: Corresponding to the Threads per Inch of the given pipe, e.g.

Create a Helix/Spiral with the following:Įxternal Thread Overall Length, L4: Total length of the external threads, included incomplete threads, or longer just as long as the total thread length is covered.

Once again, draw a circle equal to the outer diameter of the pipe.

Create a S ketch on the rear face of the extrusion.

In NPT threads chamfers are not required, although a chamfer may be present, there are no specifications on the angle and depth of the chamfer.įor other types of tapered threads such as Aeronautical National External Threads, ANPT, the end must be chamfered 45° with a specified depth define in the ASE AS71051 Standard.

Chamfer the front face of the extrusion.

Boss- Extrude the circle with a 1.79° Taper to the first point on the reference sketch.

With this sketch falling on the origin, normal to the central axis, draw a C ircle concentric to the origin with a diameter equal to the outer diameter of the pipe.

These go-no-go gauges control quality of NPT threads during fabrication.

1.25 S SOLIDWORKS TOOLBOX HOW TO

To account for tolerance and precision during the fabrication of these threads, refer to guides such as this one, which explains how to use external and internal NPT thread gauges. Note that the listed dimensions are in inches and are given to four or five decimal places only to avoid errors in computation, these do not indicate required precision. These values may also be acquired using the formulas contained in the ANSI/ASME B1.20.1. Overall Length: Pipe Overall Length (note that overall length is also not listed in the table) Pipe I.D.: Pipe Inside Diameter (note that Inside Diameters are not listed in the table) Pitch Diameter, E0: Pitch Diameter at the beginning of the thread.Įxternal Thread Overall Length, L4: External Thread Length The corresponding half-angle of the taper relative to the center line is 1 degree, 47 minutes or 1.79°. Taper of Thread: The taper on all NPT Thread is 1 in 16, or 0.75” per 1 foot, with the center line bisecting the angle created. Define these reference parameters using the table above.We will use specific points on this reference sketch to define our pipe.

In this example, we are modeling a standard pipe, 1-1/2 NPT Pipe Size, at 11-1/2 Threads per Inch.

In this sketch draw a reference sketch defining the overall thread parameters.

NPT is defined by ANSI/AMSE standard B1.20.1, and in this article we’ll be specifically referencing the ANSI/ASME B1.20.1-1983, including its charts and tables. Even though we’ll be modeling a standard part in this example, this procedure may also be applied to custom components where the use of an NPT thread is appropriate. In this example we’ll be modeling a standard pipe, 1-1/2 NPT Pipe Size at 11-1/2 Threads per Inch. This quick tutorial will demonstrate how to model NPT threads on SolidWorks. Because of NPT’s mating and sealing capabilities, a practical knowledge of the NPT thread is a valuable addition to an engineer’s toolbox.

With NPT, as opposed to NPTF, the use of a sealing compound or tape is typically applied to the threads to complete the seal. The NPT geometry allows internal and external thread surfaces to further engage when torque is applied to the thread assembly. National Pipe Thread Taper or NPT threaded pipes and fittings are deployed in a variety of fields where transportation or containment of liquids, gases, steam, or hydraulic fluid is required.