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MRE5

Machinery Repairman

E-5 (Sergeant) · Navy

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

MR2 is the section LPO rank in the MR rate — you are the quality gate before parts leave the shop and the training authority for MR3 development. The instrument calibration log and the nonconformance rate for your section are the two metrics the LPO briefs to the division officer. Make sure both are clean before you walk into any scheduled inspection.

The Honest MOS Read
You are the working senior MR now. The MR3s in your section watch how you read a print before they pick up a tool, and the LPO is watching whether your section's shop record cards are cleaner than the other section's. That is the MR2 rank in concrete terms. At a ship-board shop or IMA, you run a machining section — the lathe bay, the mill and grinder section, or the whole shop floor on a smaller platform where you are the senior MR. You receive job orders, triage them by complexity and urgency, assign them to the MR3s you trust for each job type, and QA-check the work before a part is released. On complex jobs — a propulsion shaft journal requiring ±0.0001" finish grinding, a custom valve seat with compound-angle geometry — you do the setup and run the part yourself and let the MR3 observe. The calibration ownership is new at MR2. Every measuring instrument in your section has a calibration due date tracked in the 3M system or the section's instrument log. When an instrument is due for calibration, you initiate the turn-in to the metrology lab. When it comes back, you verify the certification is current and the instrument is within tolerance before it goes back into service. An out-of-cal instrument found in service by a TYCOM auditor or INSURV inspector generates a finding against the section — not the instrument. Your name is on the section, which means your name is on the finding. Precision measurement at MR2 means GD&T callouts you can verify in the shop: runout measured by rotating the part on V-blocks with a dial test indicator, parallelism verified with a surface plate and a height gauge, concentricity checked by measuring the TIR at multiple cross-sections. These are not measurements you can fake by recording the nominal; they require actual setup, actual rotation, and actual reading. The MR2 who can verify these callouts is the one the LPO assigns the complex propulsion-component jobs to. The one who cannot is the one who stays on routine bushing fabrication indefinitely. The NWAE for MR1 is the advancement event that defines the MR2 rank period. The bibliography covers the full range of MR rate competencies at the first-class petty officer level — manufacturing planning, quality management, technical-authority procedures, personnel leadership. Build a study plan with milestone checkpoints and show it to the LCPO at every monthly counseling. The MR2 who sits the MR1 NWAE on a documented study record is the one the chief's mess talks about at the advancement recommendation board. The eEVAL ranking at MR2 is the first ranking that really drives the next slate. The LPO's trait-average recommendation and the block 40 narrative both matter. The MR2 who gives the LPO something to write — measurable production output, training pipeline development, instrument calibration compliance, advanced qual completions — is the MR2 who gets an EP or MP recommendation. The one who shows up and does the work but gives the LPO nothing specific to write gets the block 40 narrative that sounds like everyone else's.
Career Arc
  • 01MR2 designation: first full section QA responsibility — your sign-off is the last quality gate before parts leave the shop.
  • 02Cylindrical grinding qualification and advanced-tolerance jobs opened — ±0.0001" finish work on propulsion components.
  • 03Instrument calibration ownership: section cal-due tracking, turn-in initiation, re-certification verification.
  • 04Complex GD&T verification: runout, parallelism, concentricity verified in-shop with V-blocks, surface plate, DTI.
  • 05NWAE for MR1 studied on documented timeline; exam taken on the LCPO's schedule.
  • 06eEVAL ranked against peer MR2s — trait average and block 40 narrative both matter for the next slate.
  • 07NEC pipeline in motion or documented reason it is deferred; advanced machining qual (cylindrical grinding, gear-cutting) completed.
Common Screwups
  • ×Releasing an MR3's part without a dimensional check on the critical feature — trusting the MR3's self-report instead of verifying. The section supervisor's sign-off is the quality gate; when the part fails in service and the investigation reads the shop record, it is the MR2's signature that certifies the dimensions were verified. If they were not verified, the MR2 signed false certification.
  • ×Letting instrument calibration drift because 'the lab turnaround is slow.' A slow metrology lab is not an acceptable reason to keep an out-of-cal instrument in service. The correct action is to take the instrument out of service the day it expires, substitute a calibrated instrument, and expedite the turn-in. The INSURV inspector who finds an out-of-cal mic on the machine tool does not accept the turnaround-time explanation.
  • ×Running a complex job solo without documenting the setup parameters in the job record. When the same part needs to be fabricated again in six months, the setup parameters the MR2 ran from memory are gone. Document every non-standard setup: fixturing method, offset values, speeds and feeds for unusual materials, inspection sequence.
  • ×Skipping the NWAE study cycle because the section is busy. The MR rate is small enough that a missed NWAE cycle delays advancement 18-24 months relative to peers who sat the exam. The section is always busy; the study plan exists to protect the 30 minutes per day that advancement requires regardless of tempo.

A Day in the Life

  • 0545–0630PT formation. MR2 sets the standard the MR3s run to; PRT Good High is the floor for someone who wants the LPO's trust on a complex grinding setup.
  • 0700–0730Quarters and work-order triage. MR2 reviews the queue with the LPO, assigns job orders to MR3s by competency, identifies complex setups that require MR2 execution.
  • 0730–0900Complex job setup — cylindrical grinding or multi-surface milling job. MR3 observes the setup sequence; MR2 documents the parameters in the job record before the first operation.
  • 0900–1100Section QA: review shop record cards from yesterday's MR3 production work, mike the critical features on released parts before they ship to the customer, sign or return.
  • 1100–1130Calibration check: review the section cal-due tracker, initiate any turn-ins due within 30 days, verify instruments returned from the lab.
  • 1130–1300Noon meal.
  • 1300–1500Production work on complex job or mentoring session with MR3 — focused on the two or three habits that are limiting the MR3's measurement accuracy.
  • 1500–1600NWAE study: 30 minutes on the current BIB chapter, logged.
  • 1600–1700Brief input prep: compile section work-order status, cal status, PMS due dates for the weekly division brief. Write it before the LPO asks.
  • 1700–2200Liberty or duty. Duty MR2 handles after-hours work orders and is the primary QA authority for anything the duty section produces.

Weekly Cadence

The MR2's week has three rhythms: production, quality, and development. Production rhythm: the work-order queue drives the shop floor from Monday morning triage through end-of-week QA reviews. The MR2 who manages the queue without the LPO managing it is the one who gets the more complex assignments. Quality rhythm: the calibration tracker review is a Monday morning task, the shop record card audit is a Thursday afternoon task before the weekly division brief. The MR2 who finds problems in the Thursday audit before the LPO does is the MR2 who brings solutions, not surprises. Development rhythm: NWAE study plan runs on its own 30-min/day cadence regardless of production tempo. The section that is in surge does not get a NWAE exemption; the 30 minutes comes from somewhere in the day. When underway or in availability surge, the production and quality rhythms dominate. The MR2's availability surge role is to keep the QA gate clean under production pressure — the most common surge failure is the MR2 who starts waving parts through because 'we need this part on the ship tonight.' The part that fails because the QA gate was bypassed under surge pressure is the part that writes the MR2's name in the incident report, not the schedule pressure that caused the bypass.

Key Skills — How to Drill Each

  1. 01
    Plan and execute a multi-operation job — turning, boring, milling, grinding — from a GD&T drawing to ±0.0005" tolerance on critical features.
    The discipline is in the sequencing: rough all features first, then semi-finish, then finish. Never take a finish pass on one feature while adjacent features are still rough — the stress relief from rough-cutting adjacent stock moves the workpiece in the fixture and shifts the finish feature off location. For propulsion-component work (shaft journals, bearing bores), plan the grinding sequence last — cylindrical grinding is always the final operation after all turning and milling is complete, because grinding cannot correct a feature that is out of location.
  2. 02
    Set up and run a cylindrical grinder for bearing journal work to ±0.0001" with 8–16 Ra finish.
    Wheel dressing is the make-or-break for cylindrical grinding: a glazed wheel produces chatter marks and heat at the surface. Dress the wheel at the start of every setup, verify the dresser is sharp, and dress in one continuous traverse at the correct infeed. Wheel grade for steel journals: a vitrified-bond aluminum oxide wheel in the medium range for most applications. Spark-out passes — two or three passes without additional infeed — are how you achieve the final size without leaving a tool mark. Mike at three cross-sections and two angular positions; document all six measurements on the shop record.
  3. 03
    Manage section measuring instruments through the calibration cycle — track, turn in, verify, return to service.
    Build a cal-due tracker with instrument ID, cal interval, last cal date, and next due date. Set a 30-day alert before each due date. Instruments due within 30 days go on the turn-in list now, not on the due date. When instruments return from the lab, verify the certification sticker date and the calibration certificate before returning to service — the lab occasionally returns instruments with an error; catch it before the section uses it. The INSURV inspector will pull the calibration log and verify that the section tracks dates proactively, not reactively.
  4. 04
    Write the section's input to the shop readiness brief — work-order status, cal posture, PMS, material-on-order — clean enough the division officer presents it without alteration.
    The brief input is a data product, not a narrative. Format: work orders in the queue (by job number and status), work orders completed this period (by job number and disposition — part released, part in QA, part returned for rework), instrument calibration status (number current, number due within 30 days, number out-of-service pending cal), PMS MRC cards due this period (completed vs. overdue). If there is an overdue item, own the reason and the correction timeline in the brief — the division officer who discovers the overdue item in the inspection is less forgiving than the one who was briefed on it.
  5. 05
    Verify GD&T callouts for runout, parallelism, and concentricity in the shop using V-blocks, surface plate, and DTI.
    Runout: mount the part on V-blocks, sweep a dial test indicator along the journal surface while rotating the part by hand — one full revolution, three cross-sections. Record TIR at each section; the print callout is a maximum TIR, not an average. Parallelism: mount on a surface plate on a height gauge, zero the indicator on the datum surface, traverse to the controlled surface and sweep the full length — the height gauge deviation is the parallelism error. Concentricity: run TIR at multiple cross-sections along the axis, calculate the offset of the measured axis from the datum axis. If you cannot make the measurement with the shop's instruments, say so before you run the part — the LPO can request support from the IMA metrology section, but not after the part has been released.
  6. 06
    Mentor an MR3 from basic production certification to independent production on a primary machine tool.
    The mentoring sequence: observe the MR3 on supervised production work for two weeks and identify the two or three habits that will limit accuracy — rushing the measurement step, trusting the dial setting instead of the mic, not indicating the workpiece in before boring. Address those specific habits with direct feedback and follow-up observation. Assign increasingly complex jobs as the correction habits take hold. The MR3 who is independent on the lathe is ready for the mill qualification; the one who still needs the MR2 to catch measurement errors is not. Counsel honestly — the MR3 who is pushed to independence before the accuracy habits are solid generates nonconformances the section is accountable for.

Manuals & References — What Chapters Matter

  • NSTM Chapter 556 — Machinery Repair
    At MR2 you enforce this standard for the section, not just follow it. The nonconformance disposition section and the documentation requirements section are the ones you will reference most often — when a borderline part needs a disposition call, you need to know whether Chapter 556 authorizes the rework or requires a technical authority review before the part is released.
  • NSTM Chapter 505 — Piping and Plumbing
    Flanges, fittings, and piping components the MR section regularly fabricates have dimensional standards in Chapter 505 that are distinct from the general-tolerance framework in Chapter 556. A flange face that meets Chapter 556 tolerance but violates the Chapter 505 surface-finish requirement for a gasket joint is non-conforming — know which chapter controls which feature.
  • NAVSEA S9086-series Technical Manuals for your platform's propulsion and auxiliary systems
    The OEM tolerances for propulsion shaft journals, bearing bore diameters, and coupling-flange fits live here. Before any job that fabricates or repairs a component that interfaces with a propulsion or auxiliary system, pull the relevant S9086 section and verify the tolerance. The tolerance in the NAVSEA drawing may be tighter than a general-class-of-fit specification, and building to the looser tolerance is a non-conformance even if the part is within the Machinery's Handbook standard.
  • OPNAVINST 4790 series — 3M / PMS policy
    At MR2 you own the PMS compliance posture for the section and defend it at the TYCOM 3M spot-check. The policy governing what constitutes a falsified signature, how overdue items are reported, and what the corrective action documentation looks like is in this instruction. The INSURV inspector who finds an overdue MRC on the shop floor is going to cite section supervisor accountability — that is you.
  • NWAE Bibliography for Advancement (BIB) for MR1 cycle — current
    Pull the current cycle from MyNavyHR/NETC. At MR2 the BIB covers manufacturing planning, quality management, technical-authority procedures, and personnel leadership at the first-class level — it is broader than the MR3 BIB and requires a longer study timeline. Build milestone checkpoints and show the log at every LCPO counseling session.
  • NAVPERS 18068 — NEC catalog, current MR-rate entries; current NAVADMIN for MR advancement quotas
    At MR2 you are mentoring MR3s through NEC pipeline decisions. Pull the current NAVADMIN alongside the NEC catalog so you are advising off current information, not last cycle's data. The NEC that had a 60-day pipeline last year may have a 9-month pipeline now, and the wrong advice is worse than no advice.

Standards — How to Hit Each

  • Shop measuring-instrument calibration 100% current — every instrument tracked, no out-of-cal gauge in service.
    Build the cal-due tracker on the first day you take section responsibility and maintain it weekly. The rule is simple: if the instrument's next cal date is in the past, it is out of service regardless of whether it 'seems fine.' The metrology lab will find the out-of-tolerance condition the section never noticed, and the certification is retroactively invalid from the expiration date. Every part measured with that instrument from the expiration date to the turn-in date has an invalid dimensional record.
  • Zero job orders returned with a non-conformance on a section-supervised part attributed to machinist error or inadequate QC.
    The QA gate is the MR2's personal check on every critical dimension before the part is released. Do not delegate the final QA to the MR3 who made the part — the MR3's self-check is part of the process, not the QA gate. When you mike the critical feature yourself and it is in tolerance, you sign the card. When it is borderline, you note the reading and bring it to the LPO before releasing. The part that comes back because the MR2 signed a borderline dimension without escalating is the part that damages the section's credibility with the customer.
  • NWAE for MR1 prepared on documented timeline; eEVAL ranking supporting EP / MP recommendation.
    The study log and the eEVAL are connected: the LCPO who sees a documented study plan is also seeing a sailor who manages their own development without supervision, which is a direct input to the eEVAL leadership trait. Show the study log at every monthly counseling. Build the eEVAL input bullets quarterly — one bullet per quarter documenting a specific production accomplishment, training development event, or quality management result. Four quarters of specific bullets produce a block 40 narrative the chief can defend at the ranking board; four quarters of blank memory produce a generic paragraph.

Technical Mistakes — Concrete Consequences

  • Releasing a part with an instrument that is past its calibration due date.
    The calibration certification is invalid from the expiration date. Every measurement made with that instrument after expiration is undocumented for QA purposes. If the part is installed in a shipboard system and fails, the investigation that traces back to the shop record will find an invalid instrument certification on the releasing MR2's section log. The INSURV finding against the section is the immediate consequence; the investigation finding is the career consequence.
  • Signing off an MR3's work without a physical dimensional check on the critical feature.
    The section supervisor's signature is the certification that the dimensions were verified. It is not a certification that the MR3 said the dimensions were correct. When the part is returned by the customer with a non-conformance on a controlled dimension and the shop record shows the MR2's signature on the QA line, the question is not 'did the MR3 make an error' — it is 'why did the MR2 sign without checking.' The answer 'I trusted the MR3' is not acceptable to the division officer, the CHENG, or a JAGMAN investigator.
  • Setting up a cylindrical grinding job without dressing the wheel or verifying wheel grade.
    A glazed grinding wheel transfers heat instead of cutting. Heat at the surface of a bearing journal causes thermal stress and possible heat checks — surface cracks detectable by magnetic particle inspection. A bearing journal with heat checks is a non-conforming part that may require replacement rather than rework, depending on the depth of the cracks. The nonconformance and the rework cost trace to the grinding setup, which traces to the operator who did not dress the wheel.
  • Allowing a complex job to run through an MR3 who is not certified on the required operation because 'the schedule is tight.'
    A certification exists because the operation requires a demonstrated competency threshold. An MR3 who has not been certified on a cylindrical grinding operation running a shaft journal job produces work at an unknown quality level — and the section supervisor who assigned the uncertified operator is accountable for the outcome. The schedule is never tight enough to justify running unqualified operators on controlled operations.

Career Decisions at This Rank

  • Pursue the MR1 NWAE seriously vs. pursue commissioning (MECP/SEAP).
    The MR2 rank is the typical decision point for the commissioning conversation. MECP (Enlisted Commissioning Program) candidates from technical rates are competitive; the MR rate's machining and metrology background maps well to naval engineering. The honest analysis: commissioning extends service commitment significantly, the officer career arc is more varied but less technically specialized, and the post-Navy civilian market for a former naval engineering officer is broad but different from the precision-machining market for a senior MR. Have the conversation with the division officer and the LCPO with both options genuinely on the table, not as a hypothetical.
  • Advanced machining quals (cylindrical grinding, gear cutting) now vs. later.
    The cylindrical grinding qualification is the single strongest differentiator for the MR2-to-MR1 advancement at the Chief board level. Tenders and IMAs have cylindrical grinding equipment; ship-board shops on DDGs and LHDs generally do not. If the current assignment has a cylindrical grinder, pursue the qualification now. If not, request the next assignment to an IMA or tender specifically to acquire it. The MR1 who arrives at the Chief board without advanced grinding credentials is competing against MR1s who have them.
  • IMA shore duty vs. continued sea duty at MR2.
    The IMA shore-duty tour provides access to community college machining coursework, a broader machine-tool inventory, and a more stable schedule for family. The sea-duty tour provides the operational experience and surface warfare credential that the advancement board weights positively. The right answer depends on family situation, geographic preference, and which billet offers the advanced machining quals not available at the current assignment.

How the Seat Varies by Unit Type

  • Tender (AD / AS)
    The MR2 on a tender is running the highest-production machining environment in the Navy. Multi-customer job orders, diverse materials, urgent timelines. The calibration discipline and QA gate are under the most stress here — production pressure is highest, which is exactly when shortcuts are most tempting and most consequential.
  • IMA (Intermediate Maintenance Activity)
    Broader machine-tool inventory (including CNC turning centers and VMCs at some IMAs, though the MR rate is trained on manual machines), broader customer base, community college access during off-hours. The production supervisor at an IMA may have 15-20 MR2s across multiple sections; the MR2 who produces consistently clean shop records stands out in that environment.
  • Repair ship (AR) or salvage ship (ARS)
    Smaller crew than a tender, more focused mission. The MR2 on a repair ship is often the senior production-level MR with the LPO being an MR1 who is also the LCPO on a small hull. More responsibility faster, less oversight. The MR2 who thrives here builds strong independent judgment; the one who needs daily direction struggles without the larger-shop structure.

What Good Looks Like at This Rank

The high-performing MR2 is the petty officer the LPO assigns the complex propulsion-component jobs to — not because the LPO is filling the queue, but because the LPO knows those jobs will come back with clean shop records and parts that are in tolerance on every controlled dimension. That trust is earned one clean shop record at a time, over months, not claimed. The observable behaviors: the section's instrument calibration log is spotless and the MR2 can tell the LPO the next due date for every instrument in the section without looking it up. The MR3s in the section understand that the MR2's sign-off on the QA line means the MR2 personally checked the critical feature — they bring the part to the MR2 with the measurement already recorded and the mic in hand, because they know the MR2 is going to verify, not wave it through. The thing the chief talks about at the advancement recommendation board is not the most dramatic job the MR2 ran — it is the consistency. The eEVAL bullets the chief can defend are the ones with specific results: 'Maintained section instrument calibration at 100% over a 12-month period spanning two underway deployments'; 'QA-certified 47 production parts for propulsion and auxiliary systems with zero returned nonconformances.' That is what a ranked MR2 record looks like.

Preview — The Next Rank

MR1 is the LPO rank. The division officer brief is the MR1's product, not the LPO's summary. The eEVALs the MR1 writes drive the next MR3 and MR2 advancement slates. The shop's calibration log, the nonconformance rate, and the work-order throughput are all briefed up the chain under the MR1's name. The Chief board conversation starts at MR1. The LCPO is building the package while the MR1 is still running the section. Advanced machining quals, the EOOW-equivalent Shop Production Supervisor qualification at an IMA, the commissioning-mentoring record — all of these are the currency of a competitive Chief board package, and none of them happen without deliberate investment during the MR1 rank period.
FAQ

MR E5 — Frequently Asked Questions

Q01What does a E5 MR (Machinery Repairman) actually do?
You run a machining section — the lathe bay, the mill and grinder section, or the full machine shop on a smaller platform where you are the senior MR and the LPO in everything but name.
Q02What's the most important thing to know as a E5 MR?
MR2 is the section LPO rank in the MR rate — you are the quality gate before parts leave the shop and the training authority for MR3 development.
Q03What does a typical day look like for a E5 MR?
Time-blocked day at the E5 MR rank tier: 0545–0630 PT formation. MR2 sets the standard the MR3s run to; PRT Good High is the floor for someone who wants the LPO's trust on a complex grinding setup, 0700–0730 Quarters and work-order triage. MR2 reviews the queue with the LPO, assigns job orders to MR3s by competency, identifies complex setups that require MR2 execution, 0730–0900 Complex job setup — cylindrical grinding or multi-surface milling job. MR3 observes the setup sequence; MR2 documents the parameters in the job record before the first operation,…
Q04What mistakes get E5 MR soldiers fired or relieved?
Releasing an MR3's part without a dimensional check on the critical feature — trusting the MR3's self-report instead of verifying. The section supervisor's sign-off is the quality gate; when the part fails in service and the investigation reads the shop record, it is the MR2's signature that certifies the dimensions were verified. If they were not verified, the MR2 signed false certification;…
Q05What career decisions matter most at the E5 MR rank tier?
Pursue the MR1 NWAE seriously vs. pursue commissioning (MECP/SEAP) — The MR2 rank is the typical decision point for the commissioning conversation. MECP (Enlisted Commissioning Program) candidates from technical rates are competitive; the MR rate's machining and metrology background maps well to naval engineering. The honest analysis: commissioning extends service commitment significantly, the officer career arc is more varied but less technically specialized,…
Q06What's next after E5 for a MR (Machinery Repairman) in the Navy?
MR1 is the LPO rank.
Q07What manuals and regulations does a E5 MR need to know cold?
NSTM Chapter 556 — Machinery Repair: the governing standard you now enforce for the section, not just follow.; NSTM Chapter 505 — Piping and Plumbing: flanges, fittings, and piping components the MR shops regularly fabricate; know which tolerances live here vs. Chapter 556.; Machinery's Handbook (current edition): you pull it when the MR3 asks about speeds and feeds, and you can open to the right page without hunting.

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Published by the Honest MOS Editorial DeskVerified against DoD/.gov sourcesUpdated May 2026Editorial standards