Understanding Machining Economics
The economics of precision machining can be understood with four factors: machining cost, material cost, tool cost, and cost of non-productive time (setup costs).
Since material costs and nonproductive costs are constant, they are combined into the fixed cost line at the bottom. Graph based on AISI Cold Finished Steel Bar Manual, 1968.
The economics of precision machining can be understood with four factors: machining cost, material cost, tool cost, and cost of non-productive time (setup costs).
The line labeled “machining cost” (made up of labor and overhead cost of time per piece) reduces with increasing speed by reducing operating (cycle) times.
The cost for tools, on the other hand, increases with increasing speed. This is because tool life decreases with increasing speed. Since machining and tool costs vary with the speed of operation, a minimum total cost occurs at a definite set of conditions for material, tooling and operating speed.
Purchasing improved tools is one way to move the machining cost, and total cost per piece curves to the right and down, as is adding coatings, improved metalworking fluids and their delivery, and so on.
As long as the gain in speed and the drop in cost for production are larger than the cost of the improved tooling or other process improvements, you can improve or further optimize the economics of your production.
Our industry has benefited greatly from the many improvements in tool materials, coatings, metalworking fluids and design improvements. Are you taking full advantage?
Originally posted on PMPASpeakingofPrecision.com.
Related Content
-
When a CNC Turn-Mill Doesn’t Turn
A shop in Big Sky Country uses a B-axis multitasking machine to produce complex, prismatic medical parts that require no turning complete from barstock.
-
Micro-Drilling: 9 Questions to Answer Before Beginning
Applications for micromachining continue to grow. Successful machining with small tools calls for a different set of process skills on the shop floor.
-
Metalworking Fluid Management and Best Practices
Cutting metal is a complex process involving many critical factors to be successful. Correctly applied metalworking fluids, including oils or coolant, is one of these critical factors.