1. Machine Overview & Key Specs (Reference)

To properly inspect, first gather any spec data available — here’s what you should look for or ask:

• Make & origin: ORT (Italy) — their RP series of rolling machines are built in Italy.
• Model: RP50 MS5 (variant)
• Key parameters: rolling force capacity, die size range, feed/infeed modes (in-feed / thru-feed), CNC control axes, servo motors, spindle RPM, die inclination mechanism (if applicable)
• Note: ORT’s RP series (including “EVO” or “CN” variants) are servo-driven, with PLC and touch screen interfaces.
• Ask for original machine drawings, build sheets, user manuals, and spare parts lists.

Having good documentation is critical before physical inspection.

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2. Documentation & Records to Request

Before visiting the machine, secure or review:

Document	Purpose / What to Verify
Build / specification sheet	Confirms original configuration, capacity, options
CNC / PLC backups	Ensures you can restore control parameters if needed
Maintenance & service logs	History of repairs (dieholders, gearbox, bearings)
Calibration / alignment certificates	Ensures machine was within tolerance during life
Spare parts list, tooling list	Availability of dies, spare spindles, bearings
Electrical and hydraulic schematics	Aid in fault diagnosis and repair
Machine hours / cycles	Estimate wear based on utilization

If any of these are missing, that is a red flag to negotiate lower or request additional tests on-site.

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3. Structural & Mechanical Inspection

When on-site, carefully check the physical integrity of the machine:

Frame, Base & Alignment

• Check for cracks or weld repairs on base, columns, cross members, or support structure.
• Inspect weld seams and bolt joints—visible distortion can hint at overloads or structural stress.
• Leveling pads: ensure they are intact, properly adjusted, and not excessively worn.
• Machine alignment: later in tests, you’ll verify that axes are aligned (dieholder alignment to rolling axis, parallelism, etc.).

Guideways, Slides & Ball Screws

• Jog each axis (if machine has linear axes for feed, repositioning, or die tilt) at low and high speed; listen for roughness, binding, or vibration.
• Check backlash on feed axes using a dial indicator with servo-locked axes.
• Observe lubrication lines: are they clean, correctly routed, and supplying lubricant to sliding and rolling surfaces?
• Inspect couplings, support bearings, and end supports for play or noise.

Gearboxes, Linkages & Spindle Drives

• The machine’s roll-driving spindles might use gearboxes or direct drives. Listen for unusual gear whine, backlash, or looseness.
• Check for oil leaks at seals, flanges, and inspection ports.
• Verify that rotating parts (spindles, cross-feed screws) spin freely when decoupled (if possible) and without abnormal resistance.

Dieholders & Inclination / Tilt Mechanism

• Many thread/gear rolling machines use a mechanism to incline or tilt dies. Check that the inclination mechanism is stiff, repeats accurately, and does not “wander.”
• Inspect dieholder slides, bearings, and clamping elements (hydraulic or mechanical) for wear or play.

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4. Control, Servo & CNC Systems

The “CNC” aspect of RP50 MS5 is crucial—verify that electronics and control systems are genuinely functional.

Control & PLC

• Power up the machine—watch for errors or alarms.
• Load stored programs; check axis homing, jog functions, parameter read/write, and touch screen responsiveness.
• Verify CPU, I/O, and communication modules appear clean, undamaged, and free from burnt or corroded connections.
• Confirm that you can back up or export PLC programs, recipes, and control parameters.

Servo Drives & Motors

• Check diagnostics screens or readouts for servo error codes (overcurrent, encoder fault, following error).
• Jog axes at different feed rates; listen and feel for stuttering or lag.
• After static tests, run a dynamic motion test (e.g., move axes along a programmed contour) and see if axes follow without oscillations or hunting.

Sensors, Limit Switches & Safety

• Verify limit switch and home sensor operation for all axes.
• Emergency stop, protective covers, and interlock doors should immediately stop motion when triggered.
• Check wiring harnesses, connectors, shielding, and cable carriers for wear, kinks, or exposed wires.

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5. Precision, Accuracy & Performance Testing

These are tests to gauge whether the machine is still capable of high-quality thread or gear rolling.

Static & Geometric Checks

Parameter	Test Method	Acceptable Tolerance*
Axis backlash (feed axes)	Dial indicator test	≤ ~0.01 mm (varies by spec)
Spindle / roll spindle runout	Test bar or precision collet	≤ 0.005 mm (if new)
Dieholder alignment / parallelism	Use master ground block or straightness bar	≤ 0.01 mm over die span
Inclination accuracy / repeatability	Indicator or angle test	≤ a few hundredths of a degree
Coupling backlash	Measure input/output coupling play	Very minimal

* These tolerances are approximate; refer to ORT spec sheets or ask for factory tolerances.

Dynamic & Functional Rolling Tests

1. Dry Motion Test
   Run the machine in CNC mode without workpiece—move through full axis range, check for smooth motion, stop at limits, check acceleration/deceleration behavior.
2. Test Rolling of Sample Part
   Use a known blank and dies (if available) to roll a sample thread/gear. After rolling:
   • Check profile accuracy vs. known master or drawing.
   • Verify pitch, diameter, surface finish, and residual stresses (no cracks or deformed features).
   • Inspect wear on dies post test to see if the machine caused abnormal loading.
3. Cycle Repeatability
   Run multiple repeated rolls (e.g. 20–50 cycles) with same blank; measure variation in roll parameters (diameter, thread pitch, alignment) — ideally variation within a few microns.
4. Speed / Load Test
   If feasible, run at near-production speed using heavier blanks to see if drive system holds up without drive faults or loss of control precision.

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6. Wear Indicators & Consumable Condition

These are parts you should check carefully, as they often reveal the true “age” of a rolling machine.

• Die wheels / rolling dies: check for pitting, chipping, wear, dimensional drift.
• Dieholder clamps, collets, or inserting mechanisms: wear or looseness.
• Gearbox oil: check for metal contamination or discoloration.
• Bearings (spindle, feed axes): noise, heat, play.
• Lubrication filters and lines: clogged lines, dirty filters.
• Cable carriers, protective covers, bellows: cracks, broken links or rigidity.
• Hydraulic / pneumatic seals: check for leaks at cylinders or actuators.

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7. Acceptance & Run-Off Checklist

Here’s a checklist you can use as part of your inspection contract or acceptance test:

Test / Check	Target / Acceptable Result
Machine powers on with no major alarms	✓
All axes servo / CNC moves smoothly	✓
Axis backlash within spec	✓
Spindle / roll spindle runout minimal	✓
Control programs load / save correctly	✓
Limiting switches, sensors, E-stop functional	✓
Test roll demonstrates correct profile & pitch	✓
Repeatability across 20–50 cycles within tolerance	✓
Gearbox / oil free of heavy wear particles	✓
Structural integrity (no cracks, welds)	✓
Dieholder tilt or inclination mechanism accurate & repeatable	✓

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8. Common Failure Modes & Weaknesses in Used ORT Rolling Machines

Be alert for these common issues when assessing a secondhand ORT RP50:

• Excessive gearbox backlash or wear in drive train (gears, shafts)
• Dieholder mechanism play or looseness in inclination or clamping
• Aging or drift in servo encoder systems
• Control electronics obsolescence or missing backups
• Corroded or dry lubrication systems leading to poor slide action
• Deteriorated cables, harnesses, or broken cable carriers
• Wear in bearings or couplings that is not user-visible but shows up under test load

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9. Evaluation Summary Table

Category	Excellent	Acceptable
Structure & Frame	No welds, tight tolerances	Minor cosmetic repair
Axis & Feed Mechanisms	Smooth, no backlash	Slight backlash within spec
Drive System (gearbox & spindles)	Quiet, tight, no play	Some gear whine under load
Control / CNC	Fully backed up, responsive	Some older modules, but works
Rolling Results	Profiles within spec, high repeatability	Slight variation but usable
Die & Consumables	Minimal wear	Moderate wear, but replaceable
Safety & Sensors	All interlocks correct	Minor sensor lag but functional