ENDÜMAK A.Ş is a well-established and quality sand blasting machine manufacturer in Turkey. ENDÜMAK A.Ş came to us with a problem of their one of parts due to machining difficulties after sand casting and heat treatment process. It also meant time lost and high cost for company. The problem of ENDUMAK A.Ş was solved with our R& D studying. Casting method of the part was changed as investment casting. As a result, machining cost is set to zero and dimensional tolerance values is restrict. In addition, the part is taken on stock list as spare part without machining. After the R & D studying, ENDÜMAK A.Ş start to more quality part with improvement machining process.