16 - YEILD LOSS

These are volume losses stemming from weight differences between raw materials and products or between all raw material input and the products.
The former are material losses caused by increasing wall thickness to more than the necessary level, in order to prevent casting defects (sand inclusion, surface flaws) in the raw materials or to cover the insufficient precision of shaping moulds. These losses sometimes cause the extension of machining time or the reduction of the service life of cutting blades.

The latter represents the difference between slag weight/gate weight/burr volume and product weight-material losses causing yield decline due to increased burr occurrence resulting from insufficient mould precision. In aluminium casting, the weight of runner and burr is applicable instead of the above weights.

This affects cost & not affecting the equipment OEE / OPE