Comparison of cutting precision for machined parts from drawings?

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Flanges are provided at the suction inlets on top of the water pump. The most common and cheapest type on the market is the one cast in grooves. But there are obvious errors and insufficient precision. But the cost is very low when done in bulk. If it is made using a machining center, the quantity will be low and the cost per unit will increase by at least five times. However, it’s indeed great that the machining center has low errors. The quality for export will definitely pass. The cost is too high. Recently, laser cutting has been chosen for the exterior shape, while a lathe is used for the interior. Because there are lace patterns on the outside, it can’t be processed on a lathe. It’s quite troublesome. The relative cost has dropped significantly. But the shape of the laser is not very regular. If it’s wire cutting, the cost is too high. 4 li per square millimeter. Just make a split cut using wire cutting. The earliest deliveries were made using the machining center method. Later, overall laser cutting was used without strict precision. Currently, it is external laser cutting and internal lathe wire cutting. For these processing methods, it is indicated that errors and surface finish are difficult to control; anyone with relevant data could please provide it in more detail. Easy to distinguish. How to impose constraints in a way that saves costs while still being acceptable to the other party. For larger quantities, it’s better to use casting. I’m thinking of using laser cutting next time to save money. But I’m worried about not being able to complete it on time. I don’t know how to communicate about the results of laser cutting. Or are there any recommended manufacturing processes from certain provinces?