Differences Between CNC Engraving Machine Models
Published:
2026-07-08
Author:
None
Abstract:
Let’s first clarify the differences among the three models:
1. — CNC milling machines and machining centers are machining equipment used to process workpieces requiring substantial milling operations.
2. — CNC precision engraving machines are used for operations involving small milling depths or for machining soft metals.
3. — High-speed machining centers are used to perform medium‑volume milling operations while minimizing the amount of post‑milling finishing required.
A thorough analysis of the structure of the aforementioned equipment can help us make the right choice.
I. — From a mechanical perspective
The machine tool’s mechanical structure is divided into two parts: the moving part and the stationary part. The worktable, saddle, cross‑slide table, and similar components constitute the moving part, while the bed, column, and other elements comprise the stationary part.
1. — CNC milling machining center:
The non‑moving parts have excellent rigidity, and the moving parts also have excellent rigidity.
Advantages: It can perform heavy cutting. Disadvantages: Because the moving components are equally massive, machine tool flexibility is compromised, and it is ill-suited for machining small features or executing rapid feeds.
2. — CNC precision engraving machine
The non‑moving parts must have high rigidity, while the moving parts should prioritize flexibility; they should be as lightweight as possible while still maintaining adequate stiffness.
Advantages: It can perform relatively fine machining with high precision. For soft metals, it supports high-speed machining. Disadvantages: Due to its poor rigidity, heavy‑cutting operations are not feasible.
3. High-speed machining center
The non‑moving parts must have excellent rigidity, while the moving parts should have good rigidity and be as lightweight as possible.
Advantages: It can handle medium to small‑volume cutting operations (for example, with a typical φ10 flat‑bottom end mill, a depth of cut of 0.75 mm is ideal when machining S45C steel). Disadvantages: When used correctly, it delivers high efficiency and low cost, minimizing the amount of grinding required. However, improper use quickly leads to a mountain of scrapped tools.
How to mechanically reconcile the seemingly contradictory requirements of light weight and high stiffness hinges on meticulous design of the mechanical structure.
1. The bed frame features a mesh structure combining raised and recessed ribs; in some cases, it directly employs an interconnected hexagonal honeycomb mesh design.
2. — Ultra-wide columns and beams: As you know, gantry‑type structures have long been the preferred choice among high‑speed machining equipment manufacturers due to their excellent symmetry and superior rigidity.
3. — A significant difference between the moving components and those of a CNC milling machine is the considerably wider spacing between the guide rails, which helps to mitigate adverse torque issues.
4. From a materials perspective, Meehanite cast iron—also known as inoculated cast iron—is typically used. During pouring, a specific proportion of silicon (Si) is added to modify the alloy’s microstructure, enhancing its resistance to impact and significantly improving its rigidity.
5. The machine tool’s rigidity is primarily intended to mitigate the substantial impact of the moving components on the stationary parts during high-speed motion; therefore, the guideways and lead screws should be designed with larger dimensions, and the connecting joints should be reinforced to enhance overall structural rigidity.
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