Machining Production Case: Custom Square-Round Parts

Ⅰ. Project Overview and Product Diagram

Non-standard square-round parts, two-dimensional and three-dimensional product drawings, clearly define the geometric characteristics and dimensional tolerances of the parts. The material selected for this part is 45# steel to ensure its mechanical properties, and the surface treatment uses a chrome plating process to improve wear resistance and corrosion resistance. The production quantity for this order is 5 pieces, which falls under small-batch customized production.

2D Diagram:

3D Diagram:

II. Detailed Quotation Analysis

We provide our customers with transparent and detailed quotation plans to ensure that they have a clear understanding of the cost structure. This quotation not only includes material costs, but also lists the costs of each processing step in detail.

1）Processing parameters：

Material	Surface Finishing	Quantity	Price
Steel-45#	Chrome plating	5	Contact Us

2）Price composition：

Material Prices	Surface Treatment Price	NC Price	General Milling Price	Lathe Price	Fitter	Package
The calculation is based on the market price of 45# steel and the size of the parts (D45*290).	The cost of the chrome plating process is calculated based on the surface area of the part and the process requirements.	This part is the core of the quotation, including the labor cost of CNC lathe, CNC machining, general milling, grinding machine and other links.			We also consider the costs of auxiliary processes such as bench assembly, deburring, and packaging to ensure the comprehensiveness of the quotation.

Ⅲ. Machining Process

Serial Number	Operation Name	Machining Item
1	Blanks/Cutting	D45*290
2	CNC Lathe (Front Side)	• Turn outer profile, steps, inner bore, grooves • Machine to final dimensions
3	CNC Lathe (Back Side)	• Face end • Leave 0.2 mm for finishing length • Backside chamfering
4	CNC	• Mill the large base square • Drill holes, finish bore • Fine U-groove machining • Dovetail cutter chamfering on the bottom face • Machine to final dimensions • Make a custom round fixture for profile milling
5	CNC Milling (Back Side)	• Mill the small end square • Drill holes • Chamfering • Dovetail cutter chamfering on the bottom face • Machine to final dimensions
6	Universal Milling	• Mill side flats • Drill side holes
7	Tapping	Tap threads
8	Grinding	Grind to final length
9	Deburring	Remove all burrs
10	Surface Treatment	Chrome plating

Ⅳ. Why Choose Us?

We have extensive experience in handling complex non-standard parts, with an experienced technical team and advanced equipment. We can tailor the best processing solutions to meet customer needs. From accurate quotations to rigorous process flows, we are committed to providing customers with high-quality, high-efficiency machining services.