ESCOMATIC Automatic Lathe Cam System Design Guide

In the field of precision machining, the ESCOMATIC automatic lathe is renowned for its exceptional accuracy and efficiency. Its core advantage lies in its meticulously designed cam system. This article provides an in-depth analysis of the system's design principles and implementation methods.

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Figure 1: ESCOMATIC automatic lathe cam system design diagram - Showing the precise coordination between material feed cam, counter-collet cam, and tool cams

I. Material Feed Cam

1. Basic Parameters

• Outer diameter: Ø160 mm
• Keyway width: 25 mm (radial arrangement)
• Zero position radius: 80 mm (360° position)
• Feed start point: 301° (radius 46 mm)
• Lift curve range: 301°→360° (lift 34 mm)

2. Curve Drawing Method

The material feed cam design employs a segmented division method, dividing the 301°-360° interval into four equal parts. Through lever arc positioning and lift mapping, it ensures smooth feeding motion. The specific steps include:

1）Segment division: Divide 301°-360° interval into four equal parts (division points: 315°, 330°, 345°)

2）Lever arc positioning: Create concentric circles with 91.5 mm radius from cam center

3）Lift mapping: Divide 34 mm lift into four equal parts

4）Smooth connection: Connect intersection points to form uniform rising curve

II. Counter-Collet Cam

The counter-collet cam is responsible for workpiece clamping and release, with the following action logic:

III. Tool Cam Design Specifications

1. General Rules

• Lift ratio: 3:1 (core law)
• Zero position radius: 45 mm (unified reference)
• Zero position state: Tool tip 0.5 mm from workpiece surface

2. Tool 2 Cam (Finishing/Chamfering)

• Chamfering stage (0°→12°): Working stroke Ø3.5 → Ø2.6 mm
• Rounding (12°→112°): Lift 1.8 mm
• Finishing section (112°→114°): Constant radius 41.85 mm
• Retraction (114°→360°): Uniform rise to zero position radius 45 mm

3. Tool 1 Cam (Cutting)

• Cutting end point (283°): Over-center cut 0.06 mm
• Retraction curve (283°→302°): Uniform decrease to 45 mm
• Cutting start point (131°): Cutting depth 0.86 mm

IV. Drawing and Manufacturing Points

Material Selection

• Cam base: 20CrMnTi alloy steel
• Surface treatment: Carburizing and quenching HRC58-62

Tolerance Standards

• Radius tolerance: ±0.01 mm
• Angular division: ±0.1°

Dynamic Verification

Simulate cam group motion in CAM software, focusing on:

1. Whether Tool 1 collides with collet during retraction

2. Synchronization of material feed and collet opening

Conclusion

The ESCOMATIC automatic lathe cam system design embodies the essence of precision mechanical design. Through a 3:1 lift ratio and strict phase synchronization, it achieves ±0.005mm dimensional stability in micro-shaft machining with diameters ≤4mm. Electrical Discharge Machining (EDM) is recommended for manufacturing cam profiles to ensure surface smoothness (Ra≤0.4μm).

In practical applications, special attention must be paid to dynamic verification and actual debugging to ensure that the cam follower trajectory deviation from the theoretical curve does not exceed 0.02 mm, which is crucial for maintaining machining accuracy.