Week 14 challenge

Butterfly Valve

Aim: The aim of the project is to assemble a butterfly valve using the individual parts created using NX.

Procedure:

1. Create a new assembly tab in Nx and create a new assembly.

2. Go to insert components feature and insert all the individual components to the assembly module.

2. Now rather than mixing all in we will first assemble the combined parts first and then assemble it to the body.

3. First we will assemble the shaft and the plate and join them with with the screws.

4. Bring the plate as close to the shaft portion as close as possible.

5. Then select assembly constraints and select "infer the central axis" feature and select the hole in the plate and then select the hole in the shaft. So the hole in the plate is aligned to the hole in the plate.

6. Then repeat the process for the other hole as well.

7. Then select the inner face of the plate and the flat face of the shaft and give it a touch assembly constraint do that the surfaces touch each other.

8. Now bring the screw closer to the hole , since we have inserted only one screw so we need to create copies of the screw.

9. Then infer the center axis of the screw and the hole in the sub assembly and repeat it for two holes.

10. Now give a touch relation to the face of the screw and the surface of the plate and repeat it for the second screw as well.

11. Now bring this shaft assembly close to the body and select the infer the central axis option first select the inner axis of the sub assembly and central axis of the body.

12. Now select the face of the circular plate and the inner face of the body and give them a touch relation between them.

13.Now select the retainer and bring it as close to the assembly as possible and then infer the central axis of the circular portion of the handle and the central axis of the circle in the body assembly.

14. Now select the bottom face of the retainer and the top face of the body and give them a touch relation.

15. Then bring the lever close to the assembly and select infer the central axis option and select cental axis of the shaft so that the both central axis would be coincided.

16. Now select the edge hole portion in the shaft and the edge of key hole portion in the lever and give a align relation to then .

17. Then bring the nut closer to the assembly and infer the central axis of the nut and the shaft and align them.

18. Select the bottom face of the nit and top face of the lever and give touch relation between them to constrain the nut and complete the assembly.

Drafting

1. Now go to the application section and select drafting.

2. Now select the sheet size as A0  and set the scale of the model as 1:2 

3. Now insert the base view and then project the side view accordingly and then another view beside the side view.

4.Now select the base model and create a bigger circles around the circles and create a hatch around them and give them three datums A1 ,A2 and A3 and flatness of 0.25mm for the hatched areas.

5. Now select anyone circle and give it a perpendicularity tolerance with respect to A datum and name them as B datum

6. Now select the other circle and give it a position tolerance with respect to A and B datums and then assign it C datum.

7. Now go to the other hole and give it a position tolerance with respect to all the other three datums and assign it D Datum, here the D datum is used to control the orientation of the holes which are located on the other side of the body.

8. Now in the side view select the other surface and give it a profile of the surface tolerance of 0.5mm with respect to A,B and C Datums  

9.Now on the other side give all the holes a position tolerance of 0.75mm with the respective datums of the other side so that they remain coaxial with the circled of the other side where the Datums are given.

10. Hence all the motions of the assembly are controlled and tolerances are given the GD and T of the assembly are given.