Polishing mechanism module, this module adopts single motor drive, three grinding heads for grinding, synchronous rotation.By synchronous belt drive, the position is the same, multi-phase polishing.The model design USES an electric machine head to drive more than one polishing head model, the classic is clever, welcome study reference, this model is converted into step and iges general model download, please refer to!Also includes 3d original files, welcome to download!if you like,you can paypal for you to get this models or if you have any questions also you can email to me.