27/09/2025 By CNCBUL UK EDITOR Off

From Factory Floor to Your Workshop: Evaluating a Pre-Owned , Used , Secondhand, Surplus CNC Machines Before Purchase VDF BOEHRINGER DUS 560 made in Germany

Here’s a detailed, field-tested guide for evaluating a pre-owned / surplus VDF Boehringer DUS 560 (or DUS 560 Ti) universal / CNC turning center (Germany origin). Use this as your “from factory floor to workshop” inspection roadmap, combined with reference specs to benchmark claims and spot red flags.

1. Reference Specs & Model Context (What to Expect)

Before you walk into the shop, having an expected spec envelope helps you identify overclaims. Here’s what I found for the DUS 560 / DUS 560 Ti / DUS series units:

Parameter	Typical / Published Value	Notes / Sources
Swing over bed	~ 570 mm (22.4 in)	Multiple dealer listings: Swing over bed Ø 570 mm” for DUS 560 Ti units
Swing over cross slide	~ 365 mm	Dealer listing: “Swing over cross slide Ø 365 mm
Turning length (DBC / between centers)	Typically 2,000 mm	Standard DUS 560 Ti listing shows “DBC Turning Length 2000 mm
Spindle bore	62 mm	Many seller listings for DUS 560 use 62 mm bore specification
Spindle speed / range / gears	Up to ~ 2,500 rpm, with gearing steps	Multiple sources: “Total speed range (min-1) 5-2500, 2 gear steps” for standard versions DUS 560 Ti listing: speed up to 2,500 rpm
Spindle power / torque	~ 25 kW, torque up to ~1,800 Nm (in some models)	Some DUS 560 Ti units list 25 kW power; older versions list drive power 25 kW, torque 1,800 Nm in spec sheets
Tool turret	8-station, tool size compatible with DIN 69880 / Ø50 etc.	A listing for DUS 560 Ti shows an 8-station SAUTER turret, DIN 69880 tool holders Ø50
Tailstock / quill	Quill Ø 100 mm, quill stroke ~ 190 mm (MK 5 taper)	The DUS 560 Ti listing shows quill diameter 100 mm, stroke 190 mm, taper MK5
Feed / traverse / rapid speeds	X feed up to ~5,000 mm/min; Z feed / rapid greater (e.g. 10,000 mm/min) in many listings	Some sources show feed/traverse speeds: e.g. “Feed rate X = 5,000 mm/min” in DUS 560 Ti listing
Workpiece capacity / stability	With steady rests / tailstock possibility up to 1,600 kg between centers in some configurations	The DUS series literature indicates machines that can handle large lengths (1,000–8,000 mm or more) with swings from 420 to 1,500 mm and workpiece weights up to high tons in heavy versions.
Structure / control	Heavy, rigid box-bed design; control options include Siemens 840D sl ShopTurn, optionally Heidenhain Manualplus 620 etc.

These values are your “benchmark.” If a seller claims much higher travel, rpm, or power without proof, push for validation.

Also note that VDF / Boehringer DUS series are often marketed as universal turning machines with flexibility for manual, cyclic, or full CNC operation.

2. Pre-Screening & Document Request (Before Visiting)

Before going to the site, gather as much documentation and preliminary info as possible:

Clear nameplate photos (both mechanical frame and electrical / control cabinets)
Specification sheet / manual / parts catalog for that exact DUS 560 variant
Control system details: which CNC (Siemens 840D sl, ShopTurn, or other), software version, backups
Usage history: total hours, cutting / loaded hours vs idle
Maintenance / repair records: spindle rebuilds, guide rework, turret repairs
List of accessories / tooling / spares included (steady rests, tailstock, chucks, tool holders)
Photos / video of machine in operation: axis motion, spindle rotation, tool turret indexing
Reason for sale (upgrade, idle, fault)
Shop environment: dust, coolant type, chip management, vibrations
Layout / rigging constraints: footprint, machine weight, removal path, foundation

If the seller is evasive or cannot produce many of these, consider it a warning.

3. On-Site Inspection & Mechanical Assessment

Bring measuring tools (dial indicators, test bars, micrometers) and ideally a machinist or lathe specialist. Follow a structured inspection order:

3.1 Visual & External Structure

Inspect the bed, base, box casting, bed rails for cracks, weld repairs, distortions
Check guideways / linear slides / cross slides (X, Z axes) for pitting, corrosion, scoring, wear
Examine way covers, guards, bellows—tears, missing covers, poorly fitted covers are red flags
Inspect spindle head, spindle nose, spindle bearings’ housing for signs of repair, cracks, misalignment
Inspect turret / tool changer face, indexing faces, tool mounting surfaces
Check wiring, conduits, cable carriers, connection points for patched wiring, insulation damage
Look around coolant / lubrication systems for leaks, dried coolant crust, seal failure
Examine tailstock, quill, and steady rests if included

If safe, gently jog axes to feel for binding or rough spots.

3.2 Kinematics, Backlash & Motion Testing

Move axes (X, Z) slowly over full travel to feel for smoothness or “notchiness”
Use dial indicators to measure backlash / lost motion for each axis (push-pull) at multiple points
Reverse direction near travel endpoints to detect hysteresis / deadband
Inspect ball screws / nuts / couplings / links for looseness or wear
Perform slow feed moves and observe consistency (no jumps, stutters)
Index turret or tool change multiple times to check repeatability, hesitation, or mis-index

3.3 Spindle & Tooling Inspection

Run the spindle (if safe) at different RPM speeds; listen for bearing noise, vibration
Use a test bar + dial indicator to measure spindle runout at the nose and along length if possible
Check acceleration / deceleration behavior
Examine the spindle taper, seating surface, mounting faces for nicks or damage
Operate the tool turret / tool changer: tool pick / placement, clamping, indexing accuracy
If the machine has live tooling or driven axes (optional on DUS), test those if installed

3.4 Control / Electrical / Cabinet / Electronics

Open control / electrical cabinets, examine wiring, relays, fuses, terminal strips
Look for heat damage: discolored insulation, burnt connectors, melted parts
Inspect servo drives, power modules, interface cards for damage or corrosion
Check wiring routing, shielding, strain reliefs
Power up: test switches, control panel, emergency stop, interlock functions
Navigate CNC menus: inspect parameter sets, alarm logs, tool tables
Test safety interlocks: opening doors, guard panels should disable motion

4. Operational / Load Testing & Test Cuts

If the seller allows, performing live machining under load is one of your strongest validation steps.

Run a dry / air motion program: axes, turret moves, tool changes
Execute a test cut (in appropriate material) to test surface finish, dimensional accuracy, chatter
Run a sustained cycle (30 to 60 min) under moderate load; then recheck backlash, tolerances, offsets to detect thermal drift
After warm-up, repeat earlier measurements (backlash, runout) to see if performance has degraded
Cycle tool changes / turret indexing several times under load to test repeatability and reliability

5. Metrology & Precision Checks

Use calibrated test bars, gauge blocks, or reference artifacts to check straightness, squareness, alignment of axes
Perform repeatability / reversal tests: move to reference point, retract, return, measure divergence
Inspect machined part for roundness, flatness, concentricity, tolerance adherence
After extended running, re-measure key offsets, backlash, runout to detect drift
Compare your measurements vs your part tolerances and vs benchmark values for the machine

6. Infrastructure, Installation & Practical Considerations

Confirm whether your shop floor can support the machine’s weight and dynamic loads
Verify rigging / crane / removal path, door width, ceilings, floor access
Check your power supply (voltage, phase, capacity) matches the machine requirements
Confirm coolant, lubrication, chip removal, ventilation, and maintenance access are adequate
Plan for machine leveling, foundation, anchoring, alignment
Ensure service access for swing areas, turret, control cabinet
Ascertain spare parts availability (spindles, drives, turret modules, electronics) for VDF / DUS series machines