please check the site below it can help you
https://www.youtube.com/watch?v=tXVE5O_jJi8
Click Offset Entities on the Sketch toolbar. Select Chain will be selected by default, this will select all sketch entities that are continuously connected to the one we selected.
Create a Sketch
1. Select the face shown and open a new sketch.
2. Change the view so that you are looking normal to the sketch plane. Click on the Standard Views toolbar.
3. Select the Line tool.
4. Position the cursor over the lower edge of the part. When you are over the edge, the cursor feedback will be. This is the feedback for coincident, meaning you are on the edge. Sketch a line to the right.
5. Add a Tangent Arc. Draw a tangent arc from the right endpoint of the line to the midpoint of the right vertical edge. When the cursor is over the right vertical edge, the midpoint will be displayed with a square with two diagonal lines. Once the arc is drawn there will be a midpoint relationship established with the right vertical line.
6. Add a Tangent Arc from the left end of the line to the midpoint of the left vertical edge.
7. Dimension the sketch as shown. Offset Sketch Entities the Offset Entities tool is used to make a copy of sketch entities, or edges, offset from the original by some specified distance.
8. Click any of the three sketch entities.
9. Click Offset Entities on the Sketch toolbar. Select Chain will be selected by default; this will select all sketch entities that are continuously connected to the one we selected.
10. Type 3mm for the offset. Select Reverse, if necessary, to make the preview appear above the other sketch entities. Click OK. Each arc and the line are duplicated at an offset distance of 3 mm. Close the Sketch The sketch must be closed to extrude the cut. Add two lines to connect the ends of the arcs. These lines need to be perpendicular to the arcs. This means that the lines must point through the centers of their respective arcs.
11. Draw a line to connect the ends of the two arcs on the left. The line should become fully defined (black).
12. If the line does not become fully defined, add a relationship to make the line perpendicular to the arc. Because we cannot add a perpendicular relationship between the arc itself and the line we will add a coincident relationship between the line and the center point of the area. By basic geometry this will make the line perpendicular to the arc.
13. Click Add Relation on the Sketch toolbar.
14. Whenever the Property Manager or a dialog box has an entry box colored in the light blue color shown at right, anything selected in the graphics area will be entered in the box.
15. Select the arc center point and the line.
16. Click to add a Coincident relationship. The line will now be black as it is fully defined.
17. Repeat the procedure to close the sketch between the arcs on the right. Cut to the Outside the Extruded Cut command can either cut what is enclosed by the sketch or everything outside the sketch.
18. Click Extruded cut on the Features toolbar.
19. Select through all for the end condition.
20. By default, the cut will remove the material inside the sketch.
21. Select Flip side to cut. Now the cut will keep the material that is inside the sketch and remove the material that is outside the sketch.
22. Click OK. The material remaining is our curved base plate.
23. Save the part to the folder Mountain board Design Project\Mountain board\ Binding folder.
WOW, Timur Choban Khidir 23. great steps. totally worth it. thanks.
https://blogs.solidworks.com/tech/2016/07/how-to-use-the-solidworks-beltchain-assembly-feature-to-control-a-chain.html
the best way is to model cylindrical shape as chain wheel. then in assembly
Insert > Assembly Feature > Belt/Chain.
define chain.
following link
http://help.solidworks.com/2018/english/SolidWorks/sldworks/t_creating_a_belt_chain_assembly_feature.htm
If you want to model the real chain wheel and chain. you should import chain in solidworks assembly. then use chain component pattern.
Furthermore, there are some other way that you can find it in youtube.
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