The following pictures are of a scrap metal or waste material re handling grab designed in turbocad professional v 15.
The grab is made of 20mm plate steel and weighs about 2 tonnes.
The unit consists of a fixed jaw and a moving jaw.
By a number of steps ie 3d adding the moving jaw making it all one unit and then relocating the reference point to the centre of the main pivot pin the moving jaw can be rotated around this axis to check for travel and clearances.
The following pictures show the moving jaw in various stages of rotation