Below is a Technical Buyer’s Handbook / Due-Diligence Checklist for evaluating a pre-owned / used / surplus Moore G18 (or similar) CNC / jig grinder made in the USA. Because jig grinders are precision machines with tight tolerances, the inspection must be rigorous. Use this as a guide and adapt to your tolerance needs, tooling, and budget.

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I. Reference / Benchmark Data (Moore G18 Typical Specs)

Before inspecting, gather or confirm the nominal / factory specs for the machine you’re considering. Below are typical data points for Moore G18 / No. 3 jig grinders from used-machine listings:

Parameter	Typical / Published Value
Table size	11″ × 24″ (width × length)
Table travel (X / Y)	18″ longitudinal × 11″ cross
Spindle housing vertical travel	~ 12-5/8″
Spindle quill / vertical travel	~ 3-5/8″ (quill / spindle head internal movement)
Table-top to wheel collet distance	2″ to 18″ range
Spindle speeds (main)	40 to 250 rpm (infinitely variable)
Grinding wheel (wheel spindle) speed	9,000 to 40,000 rpm (or more in some configurations)
Angular adjustment of spindle	± 0.15° (adjustment in small angle)
Approximate weight	~ 4,000 lbs (≈ 1,800-2,000 kg)

These are target values to compare your candidate against. Deviations might indicate wear, misalignment, or modifications.

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II. Pre-Inspection / Remote Phase (Before Arrival)

Before visiting, collect as much background and documentation as possible to reduce surprises.

1. Request documentation
    - Moore G18 manuals (mechanical, electrical, lubrication, spindle / grinding head)
    - Wiring diagrams, control schematics
    - Maintenance records: spindle rebuilds, bearing changes, overhauls
    - Calibration / alignment / inspection certificates (geometry, table, spindle)
    - Modification / upgrade history (e.g. higher rpm head, CNC retrofit)
    - Spare parts list / parts availability
2. Request photos & videos
    Ask images / video showing: frame, table, spindle head, column, guide rails, wiring cabinets, spindle head internals (if accessible), motion (if still running)
3. Key questions to ask
    - Year, serial number, total hours / duty cycle
    - Whether the machine is operational at present
    - Known problems / repairs / collision history
    - Spare parts included
    - What subsystems have been replaced or overhauled
4. Prepare inspection / measurement tools
    Dial indicators, test bars, straight edges, precision squares, alignment tools, optical devices, temperature / vibration sensors
5. Logistics / site planning
    Machine footprint, crane / hoist access, foundation / floor flatness, power / utilities, cooling / air supply

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III. Visual & Structural Inspection (Power-Off / Cold)

Before powering up, inspect structural integrity and visible mechanical subsystems thoroughly.

1. Frame, Base & Column

• Inspect the machine frame, column, base for cracks, weld repairs, distortion
• Check for signs of rework or leveling shims being altered
• Inspect surfaces for corrosion, pits, rust, especially in coolant / chip zones
• Check mounting points, base bed for flatness and alignment conditions

2. Table & Guideways, Carriages

• Inspect table surfaces: wear, scratches, flatness, surface finish
• Check guideways / bed ways for wear, scoring, pitting
• Inspect carriages / slides for looseness, slop, binding
• Check backlash or play between table and carriage
• Look at lead screws / drive mechanisms (if present) for wear, backlash

3. Spindle Head / Grinding Spindle / Quill

• Inspect spindle nose, collet interfaces, mounting surfaces for wear, damage
• Check quill / spindle head vertical motion (if accessible) for binding or play
• Inspect seals, lubrication lines, cooling plumbing to spindle or grinding head
• Inspect the grinding head rotor, spindle assembly, any collets or adaptors
• Look for discoloration or signs of overheating

4. Grinding Wheel Spindle / Head / Optics

• Inspect the wheel spindle, balancing adaptation, collets, wheel mounts
• Inspect guard covers, enclosures for wheel, chucks, protective guarding
• Check for dust / buildup, damage around the wheel area
• Confirm wheel guard / cover interlocks are intact

5. Electrical / Control Cabinets & Wiring

• Open control cabinets (if permitted) and inspect wiring terminations, connectors, panels
• Look for discoloration, burnt wires, signs of overheating
• Check drive modules, control boards, I/O modules, power supplies
• Inspect cable routing, strain reliefs, shielding
• Examine wiring in moving parts (head, carriage) for fatigue or abrasion

6. Safety / Guards / Interlocks

• Check emergency stops (E-stop) mechanical integrity
• Inspect guard doors, covers, interlock switches
• Ensure safety circuits not bypassed
• Check limit switches, home switches, motion interlocks

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IV. Power-Up & Functional / Dynamic Testing

Once basic inspection is acceptable and safety is assured, proceed to dynamic tests carefully.

1. Control & Diagnostic Verification

• Power-on control (CNC or DRO system) and check boot sequence, error logs
• Confirm parameter memory / configuration integrity
• Verify I/O input status (limit, home, safety)
• Jog axes (X, Y, vertical / spindle head) slowly, observe direction and smoothness

2. Homing / Reference Moves

• Execute homing / reference (if available) for axes
• Repeat homing multiple times, check for consistency / repeatability
• Trigger limit or safe stops to test proper response

3. Axis Motion & Accuracy Tests

• Move table across full available travel at moderate speeds, watching for binding, jerk, odd noises
• Command known increments (e.g. 10 mm, 50 mm) and measure actual displacement via dial gauge / test device
• Reverse direction to detect backlash or dead zone
• For vertical travel (spindle housing movement) check smoothness and consistency

4. Spindle & Grinding Head Tests

• Spin the spindle / grinding head (if safe) at low to mid rpm to test for vibration / noise
• Monitor motor current, stability, heating
• If possible, mount a test wheel and check dynamic balance or run-out
• Check cooling / lubrication flow during spindle motion

5. Grinding Simulation / Test Cut (if safe)

• If allowed, try a light grind on a practice part or test plate
• Measure resulting geometry, tolerance, surface finish
• Let machine run for some time to assess drift, thermal effects
• Monitor currents, vibrations, stability

6. Safety / Fault Tests

• Press E-stop during motion / spindle: ensure immediate, safe shutdown
• Trigger limit switches / home switches: axes must stop or retract safely
• Check guard / interlock behavior while motion is active

7. Extended Stability / Drift / Endurance Test

• Run cycles or idle motion for 30–60 min to allow thermal stabilization
• After warm-up, re-check key axes, backlash, repeat motion to detect drift
• Monitor temperatures (motors, cabinet, spindle)
• Use vibration / thermal tools to detect localized heating or anomalies

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V. Precision, Calibration & Accuracy Validation

Once warm and stable, perform precision measurements to assess whether the machine meets tolerance requirements.

• Repeatability test: move to a fixed point, retract, return, measure deviation
• Grid mapping test: command an array of positions (X, Y) and measure errors across the workspace
• Vertical precision: test vertical movement accuracy vs commanded positions
• Spindle / wheel concentricity / run-out: test head alignment and run-out during rotation
• Mirror / collet alignment: check interface alignment between wheel spindle and head
• Compare measured deviations to the machine’s original spec tolerances (if available) or to your acceptance limits

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VI. Documentation & Service History Review

After testing, review all records and history for clues to reliability.

• Maintenance / service / repair logs (bearing changes, overhauls)
• Calibration / alignment certificates
• Modifications / upgrades (spindle head, control, drives)
• Control parameters, software version history
• Spare parts inventory included (collets, bearings, spindle components)
• Tooling, fixtures, wheel sets, adaptors included

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VII. Risk Assessment, Life-Remaining, Cost Projection

Based on inspection and test results, build your risk model and cost forecasts:

• Key wear subsystems: spindle bearings, guideways, screws, head slides, grinding wheel interface
• Spare parts availability and cost for Moore parts
• Calibration and re-alignment cost after transport
• Transport / handling risks (shock, misalignment)
• Commissioning / downtime cost
• Control / electronics obsolescence risk
• Fallback / salvage value

You may create a weighted scoring sheet by subsystem (structure, axes, spindle, head, control) to guide your offered price.

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VIII. Contractual Safeguards & Negotiation Clauses

Use your due diligence as leverage in the contract:

• Acceptance / performance clause: condition sale on passing your functional and precision tests after installation
• Price adjustment clause: allow deduction for deviations or repair costs beyond acceptable thresholds
• Warranty / latent defect guarantee: limited coverage period (e.g. 3–6 months)
• Spare parts package: require inclusion of critical parts (bearings, collets, spindle parts)
• Documentation handover: full manuals, schematics, alignment data, parameter backups
• Transport / insurance clause: clarify liability for damage during shipping
• Installation / commissioning support: seller or qualified technician to assist alignment, setup

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IX. Post-Purchase / Installation & Commissioning Checklist

Once the machine is relocated and installed:

1. Level, align, anchor base / foundation
2. Clean, flush lubrication / coolant / hydraulic systems, replace filters
3. Recheck safety guards / interlocks
4. Power-up and repeat full acceptance / functional tests
5. Perform alignment and calibration (geometry, axes, head)
6. Run test parts under your production conditions, verify tolerances
7. Record baseline metrics (backlash, drift, repeatability)
8. Train operators / maintenance personnel
9. Establish preventive maintenance schedule
10. Monitor performance in early operation weeks for drift, anomalies