Hi, ramesh...
I am afraid you'll have to make 3D SOLID entity to extract it's main views... For this I have ALISP code - it will place isometric view of model along with projections, but you'll have to firstly pick real 3D SOLID entity... For modelling instructions, there are few basic operations you should know - making vector translated shape model - command : EXTRUDE - you can perform this also by giving line or pline as vector "path" direction; - making rotational shape model - command : REVOLVE - you select base shape, pick vector along which rotation should be performed and input angle in decimal degrees (the most used one is 360 degree - full rotation); - making cross sectional different shaped model - command : LOFT - you pick cross section shapes in desired order and eventually you pick guidlines curves from one vertex of starting shape to end vertex of ending shape... You have two options of creating 3D entities : one is 3D surface and the other which you should use is 3D solid...
After you make this basic 3D SOLIDS that can be composed into single 3D SOLID entity, you have 3 basic operations which you can use on them : - UNION (unifies more 3D SOLID entities into single one calculating unification contours of 2 or more interfering 3D SOLID entities; - INTERSECT (calculates intersection 3D SOLID entity of interferences of 2 or more 3D SOLIDS); - SUBTRACTION (this one is the most used - it means From 1 st 3D SOLID remove interfering part and rest (remove 2nd 3D SOLID))
So if you have in your mind how should 3D SOLID body model look like... In most cases with only these 6 commands you can make exact 3D SOLID model you want... Note that UNION, INTERSECT and SUBTRACT commands equally well are used in operating with 2D REGIONS as they are assumed to belong to class of 2D Modeling body entities...
For base shapes for creating 3D SOLIDS, you can use PLINE entity, or any other curve entity and if it's closed resulting 3D model will be 3D SOLID; if it's open shape - result is 3D SURFACE, but to be sure what are you making for your specific task I recommend that you make basic shape of lines, arcs, plines, ellipses, circles, xlines, rays or splines and make sure they are all in 2D placed on (WCS - this is optional, but better for understanding what you are doing), and then from these intersecting entities you create 2D shape as REGION option of BPOLY command...
One more command that is useful with modelling is SLICE command - you can slice any 3D SOLID with any plane defined by 3 points in 3D space mainly using UCS command for plane definition...
After you create 3D SOLID entity like the one that is shown on your example, you can use 3DORBIT command or VIEW command to look it in 3D Views... Once 3D SOLID has been created I suggest that you use this useful routine for your purpose : It's called ZSST.lsp... All you have to do is set view to TOP with current WCS, select 3d SOLID and pick insertion point on side where you want to place projections and isometric view... Note that routine uses FLATSHOT command so I suppose you have this built in your version of ACAD...
HTH, M.R.
