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Key Facts: TPFP Opérateur Régleur sur MOCN Exam

Niveau 3

Official RNCP39640 qualification level (EQF Level 3 / CAP equivalent)

France Compétences / CPNE Métallurgie

2 Blocs

Competency blocks: BC01 (Machining Preparation) and BC02 (Series Machining & Quality Control)

Référentiel RNCP39640

5 Years

Capitalization validity period for validated individual competency blocks

Règlement de Certification UIMM

01/10/2029

Active registration expiration date under France Compétences

Fiche RNCP39640

>= 1.33

Standard industrial process capability benchmark (Cp and Cpk) for stable automotive/aerospace series production

Norme ISO 21747 / MSP Métallurgie

The French TPFP Opérateur Régleur sur MOCN (RNCP39640, Niveau 3) validates CNC machine setters and operators in turning and milling across the metallurgy sector. Officially assessed by the UIMM through workplace performance observations, technical evidence questioning, an activity report defense, and tutor evaluation, candidates must validate both core competency blocks (BC01: Machining Preparation; BC02: Series Machining & In-Process Metrology). This 100-question English-language study adaptation covers blueprint reading, ISO GPS tolerancing, cutting parameter math, insert selection, workpiece clamping, G-code execution, and statistical quality control.

Sample TPFP Opérateur Régleur sur MOCN Practice Questions

Try these sample questions to review concepts for the TPFP Opérateur Régleur sur MOCN exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a CNC machining workshop, what is the primary technical function of the phase contract (*contrat de phase*) within the manufacturing dossier (*dossier de fabrication*)?

A.To specify the precise isostatic workpiece clamping, tooling list, cutting parameters, and operations executed at a single machine setup

B.To outline the complete factory-wide assembly process and commercial logistics schedule

C.To record the annual financial depreciation and hourly operational cost rate of the CNC machine tool

D.To list only the non-destructive testing and chemical cleaning procedures required after final delivery

Explanation: A phase contract (*contrat de phase*) provides all operational details for a specific machining setup: isostatic clamping (appui plan, linéaire, ponctuel), designated machine tool, cutting tools, cutting parameters (Vc, fz, ap), sequence of sub-operations, and dimensions generated during that phase.

2On an engineering drawing conforming to ISO GPS standards, a feature control frame on a hole pattern reads: [Position | Ø 0.08 | A | B | C]. What does this geometric specification require?

A.The hole diameter must be manufactured between 0.00 mm and 0.08 mm oversize relative to nominal

B.The center axis of each hole must lie within a cylindrical tolerance zone of diameter 0.08 mm located at the theoretically exact position relative to datums A, B, and C

C.The surface roughness inside the bore must not exceed Ra 0.08 µm relative to reference plane A

D.The perpendicularity error between the holes and datum surface A must be exactly 0.08 degrees

Explanation: In ISO GPS tolerancing (ISO 1101 / ISO 5458), a position tolerance with a diameter symbol (Ø 0.08) defines a cylindrical tolerance zone of 0.08 mm diameter centered on the theoretically exact dimensions (TEDs / *cotes encadrées*) established from datum references A, B, and C.

3An engineering blueprint specifies a surface roughness requirement of Ra 1.6 µm for a milled sealing face. How is this roughness parameter defined and interpreted?

A.The peak-to-valley maximum height Rz across a single sampling cut must not exceed 1.6 mm

B.The feed rate per tooth fz must be strictly set to 1.6 mm/tooth during rough face milling

C.The arithmetical mean deviation of the assessed profile heights from the mean line over the evaluation length must not exceed 1.6 µm

D.The total dimensional variation of the milled plane must remain within a 1.6 µm flatness band

Explanation: Ra (arithmetical mean deviation of the profile) represents the arithmetic average value of departure of the roughness profile from the mean line along the evaluation length. A value of Ra 1.6 µm is typical for standard finish milling or precision turning.

4Which statement correctly distinguishes a cylindricity tolerance (*tolérance de cylindricité*) from a circularity / roundness tolerance (*circularité*) according to ISO 1101?

A.Circularity applies to the entire 3D surface simultaneously, whereas cylindricity is evaluated in a single 2D plane

B.Circularity requires a datum reference frame, whereas cylindricity can never have datum references

C.Cylindricity controls the absolute axial position of a cylinder relative to an external datum plane

D.Cylindricity controls circularity, straightness of generatrices, and parallelism of generatrices simultaneously within a 3D annular zone between two coaxial cylinders

Explanation: Cylindricity is a 3D form tolerance controlling the entire cylindrical surface simultaneously between two coaxial cylinders separated by radial distance t. It encompasses circularity, longitudinal straightness, and parallelism. Neither circularity nor cylindricity uses datums because both are pure form tolerances.

5A pin drawing specifies a perpendicularity tolerance of [⟂ | Ø 0.04 (M) | A] on a diameter of Ø 20 h7 (20 +0 / -0.021 mm). If the machined pin diameter measures exactly Ø 19.985 mm, what is the maximum permissible perpendicularity error?

A.0.055 mm

B.0.019 mm

C.0.040 mm

D.0.021 mm

Explanation: The maximum material condition (MMC / M symbol) for an external pin occurs at its largest size: Ø 20.000 mm, where the allowed perpendicularity error is Ø 0.040 mm. At Ø 19.985 mm, the departure from MMC is: 20.000 - 19.985 = 0.015 mm. This departure acts as a bonus tolerance, so the permissible perpendicularity tolerance expands to: 0.040 + 0.015 = 0.055 mm.

6What is the standard engineering formula relating cutting speed Vc (m/min), workpiece or tool diameter D (mm), and rotational spindle speed n (rpm / tr/min)?

A.Vc = (1000 * n) / (pi * D)

B.Vc = (pi * D * n) / 1000

C.Vc = pi * D * n * 1000

D.Vc = (D * n) / (60 * pi)

Explanation: The linear cutting speed at the tool-workpiece interface is circumference (pi * D in mm) multiplied by rotational frequency (n in rpm). Dividing by 1000 converts millimeters per minute into meters per minute: Vc = (pi * D * n) / 1000.

7A CNC lathe setter is turning a C45 steel bar with an outside diameter of D = 80 mm. The insert manufacturer recommends a cutting speed of Vc = 220 m/min. What spindle speed n must be programmed on the CNC controller?

A.450 rpm

B.1,750 rpm

C.875 rpm

D.2,750 rpm

Explanation: Using n = (1000 * Vc) / (pi * D): n = (1000 * 220) / (3.1416 * 80) = 220,000 / 251.33 = 875.35 rpm. Therefore, the setter programs approximately 875 rpm.

8A machining center is face-milling an aluminum component using a milling cutter of diameter D = 50 mm with z = 4 teeth. The programmed spindle speed is n = 955 rpm and recommended feed per tooth is fz = 0.12 mm/tooth. What is the required table feed rate Vf (mm/min)?

A.114.6 mm/min

B.229.2 mm/min

C.955.0 mm/min

D.458.4 mm/min

Explanation: Table feed rate in milling is calculated as Vf = fz * z * n. Substituting the values: Vf = 0.12 mm/tooth * 4 teeth * 955 rpm = 458.4 mm/min.

9In a CNC milling operation, an end mill must machine a straight slot across a plate length of 240 mm in a single pass. The tool approach and overtravel distances total 10 mm (total stroke L = 250 mm). If the feed rate is Vf = 500 mm/min, what is the net cutting time Tc?

A.30 seconds

B.12 seconds

C.48 seconds

D.60 seconds

Explanation: Machining time Tc is calculated as Tc = L / Vf. Here, L = 250 mm and Vf = 500 mm/min, so Tc = 250 / 500 = 0.5 minutes = 30 seconds.

10During face milling, the axial depth of cut is ap = 3.0 mm, radial width of cut is ae = 40 mm, and table feed rate is Vf = 600 mm/min. What is the material removal rate Q in cm³/min?

A.7.2 cm³/min

B.72.0 cm³/min

C.720.0 cm³/min

D.1,800.0 cm³/min

Explanation: Material removal rate Q in milling is given by Q = (ap * ae * Vf) / 1000 in cm³/min (since 1 cm³ = 1,000 mm³). Q = (3.0 * 40 * 600) / 1,000 = 72,000 / 1,000 = 72.0 cm³/min.

About the TPFP Opérateur Régleur sur MOCN Exam

The TPFP Opérateur Régleur sur Machine-Outil à Commande Numérique (France) is the official French metallurgy industry certification (Niveau 3, RNCP39640) awarded by the UIMM and CPNE de la Métallurgie. It certifies professional mastery in setting up and operating computer numerical control (CNC / MOCN) machine tools—specifically CNC lathes (*tours à commande numérique*) and machining centers (*centres d'usinage / fraiseuses CN*)—for mass and series parts production by material removal. Certified setters/operators interpret technical engineering drawings and ISO GPS tolerancing, prepare and install cutting tools and modular toolholders, calculate cutting parameters (Vc, n, fz, Vf), establish part origins (G54–G59) and tool length/radius offsets (G43, G41/G42), execute and edit ISO G-code programs, approve the first-off workpiece (*première pièce bonne*), conduct in-process statistical process control (SPC / MSP) using precision metrology equipment, perform first-level machine maintenance, and adhere to strict industrial safety standards. Please note: This question bank is an English-language multiple-choice question (MCQ) study adaptation created to assist international candidates and apprentices in mastering the theoretical and practical knowledge required for the French certification.

Exam sponsor: Union des Industries et Métiers de la Métallurgie (UIMM) / CPNE Métallurgie. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The Titre à Finalité Professionnelle (TPFP) Opérateur Régleur sur Machine-Outil à Commande Numérique par enlèvement de matière is established by the CPNE de la Métallurgie / UIMM and registered under RNCP39640 at Niveau 3 (EQF Level 3) active through October 1, 2029 (TPFP/TPM 0009, historically ex CQPM 0009). The certification is governed by a tripartite evaluation process: (1) Observation en situation professionnelle réelle in an accredited enterprise or training center, accompanied by targeted questionings requiring concrete workplace evidence; (2) Oral presentation and defense of a workplace project or activity report (*rapport d'activités/projets*) before a professional evaluation commission (*commission d'évaluation*); and (3) Employer assessment (*avis de l'entreprise*) provided by the workplace tutor or supervisor against the branch activity standard. Final certification is conferred by the jury paritaire de délibération under the Groupe Technique Paritaire 'Certifications'. The certification comprises two Blocs de Compétences: RNCP39640BC01 (Préparation des opérations d'usinage sur MOCN par enlèvement de matière - 50%) and RNCP39640BC02 (Réalisation des opérations d'usinage d'une série de pièces sur MOCN et contrôle de la production - 50%). Validated blocks are capitalizable for 5 years.

Time Limit

France Compétences fiche RNCP39640 publishes no duration for the assessment: evaluation takes place in a real work situation over the course of the pathway, followed by presentation of the workplace project report to the commission d'évaluation, plus the employer's opinion (avis de l'entreprise)

Passing Score

Satisfactory evaluation across all criteria in RNCP39640BC01 and BC02 approved by the jury paritaire

Exam / Certification Fees

No separate candidate assessment fee is published by the certifier. Per fiche RNCP39640 the certification is reached through an apprenticeship contract, a professionalisation contract, a continuing-training pathway, or VAE; individual candidature is not an access route. Training and assessment costs are normally borne by the employer, OPCO 2i, the CPF, or a regional funder; ask the UIMM territorial certification centre for a current quotation

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

50%

Preparation of CNC Machining Operations (RNCP39640BC01)

Interpretation of dossiers de fabrication, routing sheets (*gammes d'usinage*), and phase contracts (*contrats de phase*); technical engineering drawings and ISO GPS tolerancing (position, runout, cylindricity, parallelism, datum references, surface roughness Ra/Rz); cutting kinematics math (Vc = pi*D*n/1000, n = 1000*Vc/(pi*D), Vf = fz*z*n, Q, Tc); ISO insert designations (carbide grades P/M/K/N/S/H, chipbreakers, coatings); toolholder interfaces (BT40, HSK, VDI); workpiece clamping safety (3-jaw chucks, soft jaws, collets, vices); part coordinate origins (G54–G59); tool length and radius offsets (G43, G41/G42); soluble cutting fluids (concentration, refractometer, pH, skimmer); and autonomous 1st-level maintenance.

50%

Series Machining Execution, CNC Programming & Quality Metrology (RNCP39640BC02)

Interpretation and execution of ISO G-codes (G00, G01, G02, G03, canned drilling cycles G81/G83/G84, roughing cycles G71, M-codes M03, M08, M30); CNC operating modes (AUTO, MDI, JOG, Single Block); first-off workpiece validation (*contrôle de la première pièce bonne*); precision measuring instruments (vernier and digital calipers, micrometers, dial test indicators, 3-point internal micrometers, cylinder bore gauges, GO/NO-GO plug and thread gauges); Statistical Process Control (SPC / MSP) with X-bar and R control charts; capability indices (Cp, Cpk); tool wear offset adjustments (wear registers, diameter vs radius); deburring, degreasing, rust protection; and non-conformance quarantine management.

Preparing for the TPFP Opérateur Régleur sur MOCN Exam

What You Need to Know

Passing score: Satisfactory evaluation across all criteria in RNCP39640BC01 and BC02 approved by the jury paritaire
Assessment: The Titre à Finalité Professionnelle (TPFP) Opérateur Régleur sur Machine-Outil à Commande Numérique par enlèvement de matière is established by the CPNE de la Métallurgie / UIMM and registered under RNCP39640 at Niveau 3 (EQF Level 3) active through October 1, 2029 (TPFP/TPM 0009, historically ex CQPM 0009). The certification is governed by a tripartite evaluation process: (1) Observation en situation professionnelle réelle in an accredited enterprise or training center, accompanied by targeted questionings requiring concrete workplace evidence; (2) Oral presentation and defense of a workplace project or activity report (*rapport d'activités/projets*) before a professional evaluation commission (*commission d'évaluation*); and (3) Employer assessment (*avis de l'entreprise*) provided by the workplace tutor or supervisor against the branch activity standard. Final certification is conferred by the jury paritaire de délibération under the Groupe Technique Paritaire 'Certifications'. The certification comprises two Blocs de Compétences: RNCP39640BC01 (Préparation des opérations d'usinage sur MOCN par enlèvement de matière - 50%) and RNCP39640BC02 (Réalisation des opérations d'usinage d'une série de pièces sur MOCN et contrôle de la production - 50%). Validated blocks are capitalizable for 5 years.
Time limit: France Compétences fiche RNCP39640 publishes no duration for the assessment: evaluation takes place in a real work situation over the course of the pathway, followed by presentation of the workplace project report to the commission d'évaluation, plus the employer's opinion (avis de l'entreprise)
Exam / certification fees: No separate candidate assessment fee is published by the certifier. Per fiche RNCP39640 the certification is reached through an apprenticeship contract, a professionalisation contract, a continuing-training pathway, or VAE; individual candidature is not an access route. Training and assessment costs are normally borne by the employer, OPCO 2i, the CPF, or a regional funder; ask the UIMM territorial certification centre for a current quotation Official sources

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TPFP Opérateur Régleur sur MOCN: Suggested Study Strategy

1Master Cutting Parameter Formulas: Memorize the foundational machining equations: cutting speed Vc = (pi * D * n) / 1000, spindle RPM n = (1000 * Vc) / (pi * D), table feed Vf = fz * z * n (in milling), and machining time Tc = L / Vf. Practice calculating parameter changes when workpiece diameter or tool diameter shifts.

2Understand ISO Insert Designations and Wear Modes: Learn the 4-letter insert code (e.g., CNMG: C = 80° rhombus, N = 0° normal clearance, M = tolerance class, G = chipbreaker and hole). Distinguish flank wear (VB), crater wear (KT), built-up edge (BUE / *arête rapportée*), and thermal cracks to diagnose machining faults.

3Master Part Origins and Tool Compensations: Know the exact function of G54–G59 part coordinate systems, G43 tool length compensation with H registers, and G41/G42 cutter radius compensation (G41 = left of path, G42 = right of path, G40 = cancel). In CNC turning, remember how tool nose radius compensation (T code and tip orientation 1–9) influences tapers and circular arcs.

4Practice Precision Metrology and Instrument Zeroing: Understand reading resolution and proper handling of vernier calipers (0.02 mm), micrometers (*palmer*, 0.01 mm / 0.001 mm with ratchet stop), dial test indicators (*pupitas*), cylinder bore gauges (*Subito*), and limit gauges (ENTRE / N'ENTRE PAS).

5Interpret Statistical Process Control (SPC / MSP) Rules: Study X-bar and R control charts, control limits (LCL/UCL) vs tolerance specification limits (LSL/USL), process capability indices (Cp for spread, Cpk for centering, target >= 1.33), and reaction rules (e.g., 7 consecutive points on one side of the mean).

Frequently Asked Questions

What is the TPFP Opérateur Régleur sur MOCN and who awards it?

The TPFP Opérateur Régleur sur MOCN (Titre à Finalité Professionnelle d'Opérateur Régleur sur Machine-Outil à Commande Numérique par enlèvement de matière) is the official French branch credential awarded by the CPNE de la Métallurgie (UIMM). Registered at Niveau 3 (EQF Level 3) under RNCP39640 through October 1, 2029 (TPFP/TPM 0009, formerly known as CQPM 0009), it qualifies CNC setters and operators in turning, milling, tool setup, and series production quality assurance.

How is the candidate officially evaluated for the TPFP certification?

The official certification relies on three complementary assessment modalities: (1) Observation en situation professionnelle réelle in an enterprise or accredited training workshop, supplemented by oral questioning requiring concrete production evidence; (2) Oral presentation of a workplace project or activity report (*dossier d'activités/projets*) before a certified evaluation commission (*commission d'évaluation*); and (3) Employer assessment (*avis de l'entreprise*) from the candidate's supervisor or tutor. Final certification is deliberated and awarded by the branch Jury Paritaire de Délibération.

What are the core competency blocks covered by RNCP39640?

The certification consists of two Blocs de Compétences: RNCP39640BC01 ('Préparation des opérations d'usinage sur MOCN par enlèvement de matière'), focusing on technical documentation, cutting parameter calculations, tooling setup, workpiece clamping, part zero setting, and 1st-level maintenance; and RNCP39640BC02 ('Réalisation des opérations d'usinage d'une série de pièces sur MOCN et contrôle de la production'), focusing on G-code program execution, first-off validation, metrology measurement, SPC control charts, tool wear offsets, and non-conformance handling.

How can an incomplete certification be completed?

Competency blocks in the metallurgy branch can be validated independently through capitalisation. Once a bloc de compétences is successfully validated and confirmed by the jury paritaire de délibération, its benefit is retained for 5 years, allowing candidates to re-sit only the unvalidated bloc.

Why is this practice question bank presented in English?

This question bank is an English-language study adaptation created for international students, technical trainees, and bilingual machining apprentices aiming to master the theoretical, mathematical, and operational concepts of the French national metallurgy syllabus. It preserves all authentic French trade terms (such as *contrat de phase*, *pièce bonne*, *mordaches douces*, *arête rapportée*, *palmer*, *pupitas*, and *fiche suiveuse*) alongside rigorous kinematic and metrological explanations. The official certification is delivered in French and assessed through real workplace observation, evidence-based questioning, presentation of a workplace project report and the employer's opinion. This bank is not an official translation, does not simulate the official assessment format, and cannot substitute for the practical machining, oral and workplace-evidence components required by the commission d'évaluation and the jury paritaire.