Here’s a practical, engineer-oriented checklist and assessment guide for evaluating a used, second-hand, surplus Magerle MFP 125.35.45 CNC Creep Feed Grinder 4-Axis before purchase. The focus is on technical condition, performance validation, wear indicators, and cost risk assessment — exactly how experienced engineers evaluate this class of machine.

---

1) Machine Overview — What You’re Looking At

Before digging into inspection, understand the basics:

Model: Magerle MFP 125.35.45
Type: CNC Creep Feed Grinder — high-precision, high-stock-removal surface grinding
Axes: 4-Axis (X/Y/Z + C-axis with rotary table)
Work Table Size: typically 1250 mm (X) × 350 mm (Y)
Feed Rate: high-precision, slow-feed for heavy grinding
Grinding Spindle: rigid, high-torque creep feed spindle
Control: likely Siemens CNC (S840D / 810D / 840Di) or Fanuc — confirm exact model

Important machine geometry facts:

Feature	Typical Value
X-Axis Travel	~1250 mm
Y-Axis Travel	~350 mm
Z-Axis Travel	~450 mm
Table Load Capacity	~1000 – 1500 kg
Spindle Speed Range	Low rpm heavy-cut to moderate finish
Table Rotation (C Axis)	0° – 360° continuous or indexed

Think of this machine as a heavy-stock, high-precision surface grinder for aerospace dies, bearing races, camshafts, turbine components, hardened surfaces — not typical flat tables like small grinders.

---

2) Visual and Structural Inspection

✔ Machine Casting & Structure

Engineers look for:

• No deep dents, cracks, repairs, or weld patches on bed, columns, saddle.
• Check weld lines on castings — stress cracks often start here.
• Smooth, unmarred ways and guides.

Tips:

• Tap key structural areas lightly with a metal pick — abnormal ringing could indicate cracks.
• Look for excessive chipping or missing covers.

---

✔ Linear Ways, Column & Saddle

Important:

• Inspect all linear guideways, dovetails, rails for wear, rust, pitting.
• Run a clean cotton cloth along guide surfaces – excessive dust or black residue indicates wear.

Wear signs:

• Deep gouges
• Evidence of past shocks
• Excessive lubrication residue

---

✔ Ball Screws & Rotary Table Bearing

• Turn the table manually (power off) — it should rotate smoothly, no backlash or rough spots.
• Check backlash by hand: any “slop” indicates worn ball screws or loose nut.

---

✔ Ball Screw Mounted Servo Motors and Encoders

• Encoder cables must be intact, no fray.
• Servo motors should not have suspicious oil residue — sign of seal failure.

---

3) Electrical & CNC Control Evaluation

✔ Control Cabinet

Check:

• Clean interior — free of rust, dust build-up, burning smells
• No missing drive cards or hacked wiring
• Look for surge protectors or UPS in cabinet

Age Indicators:

• Notice stickers/dates on wiring harnesses
• Excessive tape splices = past troubleshooting

---

✔ CNC Controller & HMI

Test sequence:

1. Power machine up (if possible)
2. Verify controller version
3. Check for:
   • No error codes on boot
   • Smooth cursor movement
   • Functional jog keys and soft keys

Red flags:

• Controller resets during power-up
• Fault codes that cannot be cleared
• Missing manuals/software

---

4) Mechanical Drives, Lubrication, Coolant

✔ Ball Screw Condition

Using hand wheel:

• No “steps” or rough motion
• No excessive backlash

Acceptable backlash on heavy machines is ~0.02 – 0.05 mm max in each axis

---

✔ Way Covers, Bellows, Cable Carriers

• Covers must be intact, not shredded
• Cable carriers must not have broken links

---

✔ Coolant System

Check:

• Tank free of sludge
• Pumps run quietly
• Filters not totally blocked

Creep feed grinding generates high heat — a healthy coolant system is critical.

---

5) Spindle & Grinding Head

This is the heart of the grinder:

✔ Spindle Runout

If possible:

• Mount a test piece or dial indicator
• Spin spindle and measure radial runout

Acceptable precision spindles often < 0.005 mm; check OEM spec

---

✔ Spindle Bearings

Symptoms of failure:

• Grinding, whining, or knocking sound
• Excessive vibration in the head
• Oil leaks

Verifying bearing condition is one of the most important checks.

---

6) Test Cycle & Functional Checks

If power up & run is possible:

✔ Dry Run Test

• Move each axis slowly then at moderate speed
• No jerky motion
• No servo errors
• No unusual vibration

---

✔ CNC Loop-Back Test

• Run manual moves in “reference return”
• Test program execution
• Jog moves must be precise

---

✔ Dust & Debris

Grinding machines create fine abrasive dust — worst enemy of mechanical parts.

Inspect:

• Sludge in ways
• Broken wipers
• Chips caught in linear rails

---

7) Functional Wear Indicators (Critical)

These are engineering go/no-go parameters:

Check	Acceptable / Concern
Ball Screw Backlash	<0.05 mm good; >0.1 mm concern
Spindle Runout	<0.005 mm near new spec
Guideway Surface	No deep grooves, pitting
Servo Errors	None during motion
Coolant Clarity	No milky oil contamination
Control Faults	None persistent

---

8) Fluid & Hydraulic Systems

Older machines often leak:

• Hydraulic pumps
• Coolant sumps
• Pneumatic actuators
• Belt tensioners

Check for:

• Oil stains on floor
• Fresh leaks
• High-pressure hose cracking

Hydraulics on grinders often control table clamping and head tilt.

---

9) Inspection Documentation

Ask the seller for:

• Run-in/test cut reports
• Error logs from CNC
• Maintenance records
• Ball screw and spindle service history
• Manuals & parameter setup

Without this history, assume potential risk.

---

10) Replacement Parts & Support

Critical parts availability:

• Spindle bearings
• Servo driver modules
• CNC control cards
• Rotary table encoder

Older machines have expensive obsolescence risk.

---

11) Cost & Risk Assessment (Engineer’s View)

Before purchase, list:

Risk Area	Estimated Replacement Cost
Spindle rebuild	High
Ball screw replacement	Moderate-High
Servo amp modules	Medium
CNC control upgrade	Very High
Way cover replacement	Low-Medium

Use this to calculate Total Cost of Ownership (TCO).

---

12) Final Go/No-Go Scorecard

Many engineers use a simple scoring rule:

• Structure & Frame: /10
• Guideways & Screws: /15
• Spindle Integrity: /20
• Servo & Control: /20
• Coolant & Lubrication: /10
• Electrical Cabinet: /10
• Documentation & Manuals: /10
• Total: /95+

Good machine: ≥ 75
Acceptable: 60-75 (minus expected repair budget)
High risk: < 60

---

Summary: Key Technical Focus Points

• Spindle condition
• Ball screw backlash
• Guideway wear
• CNC control health
• Servo drive errors
• Hydraulic / coolant systems
• Structural integrity

Smart inspection = data + tactile mechanical evaluation + documentation verification.