Comparison of some workflows to create a simple washer with FreeCAD. You can create many other workflows.
{| align="center" border="1" |- ! Version ! workflow ! move the washer, placement ! change the shape ! note |- | washer1 
| Part->Cut(cylinder001-cylinder) Part->Fillet | Can be moved Fillet, Cylinder001 and Cylinder | Edit Cylinder001 and Cylinder | If it is moved only Cylinder001 or Cylinder you create an eccentric washer |- | washer2 
| Sketcher->Create a new PartDesign->Pad(sketch) PartDesign->Fillet | placement is greyed out, to move the washer move the sketch | to change the shape simply edit the sketch | |- | washer3 
| Sketcher->Create a new PartDesign->Revolve(sketch) PartDesign->Fillet | move the sketch | to change the shape simply edit the sketch | allows you to easily create portions of washers |- | washer4 
| Sketcher->Create a new PartDesign->Revolve(sketch) | move the sketch | to change the shape simply edit the sketch | as washer3 but with the fillets included in the sketch |- | washer5 
| PartDesign->Cylinder) Sketcher->Create a new PartDesign->Pocket(sketch) PartDesign->Fillet | placement greyed out, to move the washer move the sketch | edit Cylinder or edit sketch | move sketch001 does not change anything (automatic reset), you must edit the sketch |- | washer6 
| PartDesign->Cylinder Sketcher->Create a new PartDesign->Pocket(sketch) PartDesign->Fillet | placement greyed out, to move the washer move the sketch | edit Cylinder or edit sketch | move sketch does not change anything, you must edit the sketch |}
....... to be continued .......
Other
Split washer 
Using Draft 
documentation index > Washers