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Home » nx tutorial » How to design a chain sprocket by nx expressions

How to design a chain sprocket by nx expressions

December 22, 2018 by mechanicaleng blog 2 Comments

This post I will show how to design a chain sprocket by nx expressions. This tutorial will use extrude command, revolve command, mirror command, pattern command.

siemens nx  how to design chain sprocket
siemens nx how to design chain sprocket

From Oxy plane, create a sketch then draw threes circle with diameter:

+ Addendum circle: P1=120

+ Dividing circle: P2=100

+ Dedendum circle:p3=80

siemens nx  how to design chain sprocket 1
siemens nx how to design chain sprocket 1

2: Draw 1 circle with: Center point on dividing circle. Tangent with dedendum circle

siemens nx design chain sprocket 2
siemens nx chain sprocket 2

3: draw 1 circle tangent with circle in step 2, center point on dividing circle and distance is 30 (mm).

design chain sprocket 3
chain sprocket 3

4. Use trim and mirror command to have sketching same picture below.

design chain sprocket 4
chain sprocket 4

5: Extrude addendum circle, distance 10 (mm).

design chain sprocket 5
chain sprocket 5

6. From yOz, draw 1 sketch same below.

design chain sprocket 6
chain sprocket 6

7. Use revole command to cut extrude 1 body then use mirror feature command to copy cutting.

design chain sprocket 7
design chain sprocket 7

8. Extrude cut sketch from step 4, and use pattern command as below.

design chain sprocket 8
design chain sprocket 8

Now we will use expression to change information of sprocket.

From tool -> expression

design chain sprocket 9
chain sprocket 9

D: diameter of chain: 15.88

L: Thickness of chain : 15.88

T: Pitch of chain : 25.4

Z: Number of teeth – sprocket

K: if(z<11)(0.58)else if(z<18)(0.56)else if(z<36)(0.53)else(0.5)

IN listed expressions, change to all and change information.

Addendum circle: de = t*(k+(1/tan(180/z)))

Dividing circle:dc=t/sin(180/z)

Dedendum circle:di=dc-D

Thickness of sprocket = 0.93D

In Pattern command change: number of coppy: Teeth =z, offset angle = 360/teeth

Now, when you change number of teeth, the drawing will change to follow your change.

design chain sprocket 10
design chain sprocket 10

For this tutorial, please, following this video below

Related posts:

nx create 3D cad model by extrude How to design fan in Siemens nxHow to design a fan in Siemens nx autodesk inventor how to design sphere springHow to design sphere spring in Autodesk inventor? Siemens nx sheet metal contour flangeSiemens nx sheet metal contour flange command

Filed Under: nx tutorial Tagged With: nx expressions, nx tutorial

Reader Interactions

Comments

  1. Mohammed Bilal S says

    December 20, 2019 at 8:47 pm

    Good Information! Thank you

    Reply
  2. A.Srinidhi says

    May 1, 2020 at 8:09 pm

    What does the k mean in the addendum formula?

    Reply

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