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为了使３ＭＡ４７５０Ａ精研机适应高精度、大型和特大型钢球精研工艺的要求，对机床、工装和精研盘沟形角度作了改进。改进后，该机床的钢球加工范围由原来的５０ｍｍ扩大到６５ｍｍ。
In order to 3MA4750A lapping machine to adapt to high-precision, large and large ball lapping process requirements, the machine tool, tooling and lap ditch angle has been improved. Improvement, the machine tool ball processing range expanded from the original 50mm to 65mm.