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Machine Shop and Specimen Preparation
TCR Engineering runs its own machine shop inside the Mahape laboratory in Navi Mumbai, preparing test specimens to the dimensions and surface finish the test standard requires: lathes, CNC wire-cut, stress-free grinding, milling and…
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TCR Engineering runs its own machine shop inside the Mahape laboratory in Navi Mumbai, preparing test specimens to the dimensions and surface finish the test standard requires: lathes, CNC wire-cut, stress-free grinding, milling and surface grinding. Specimen preparation stays under the same roof and the same NABL ISO/IEC 17025 accreditation (NABLT0726MH18640) as the test itself.
Why the machine shop sits inside the laboratory
A mechanical test measures the specimen, not the material. If the gauge diameter is out of tolerance, if the notch is cut to the wrong root radius, or if machining has left a heat-affected or work-hardened surface, the number the machine reports is wrong before the test starts, and nothing downstream can recover it.
Keeping the shop inside the laboratory puts specimen preparation under the same quality system, the same calibration regime and the same signature as the test.
It also protects turnaround. A sample that arrives on Monday is cut, machined and tested in one building rather than travelling to an outside workshop and back, which is where most of the elapsed time in a materials-testing job otherwise goes.
What the shop runs
The equipment set is the one recorded in the company profile for the Mahape laboratory. It covers the full range of specimen geometry the mechanical, fatigue and fracture benches call for.
- Lathes: round tensile specimens, threaded and shouldered ends, creep and stress-rupture specimens
- CNC wire-cut: fracture-toughness and fatigue geometries, and sections through welds and complex components where a saw would damage the region of interest
- Milling: flat and rectangular tensile specimens, Charpy and Izod blanks, bend specimens
- Surface grinding: the finish and parallelism a fatigue or toughness specimen needs, where a machining mark is a crack initiation site
- Stress-free grinding: removal without introducing residual stress or a heat-affected layer, which matters most on the specimens whose whole purpose is to measure how a material behaves under stress
Specimens prepared, and the standards that set their dimensions
Specimen geometry is not a workshop preference. Every dimension, radius and surface-finish requirement below is set by the test standard, and the shop machines to the standard the client's specification names.
| Specimen | Prepared for | Governing standard |
|---|---|---|
| Round and flat tensile | Tensile, proof stress, elongation, reduction of area | ASTM E8/E8M, ASTM A370, ASTM B557, ISO 6892, IS 1608 |
| Elevated-temperature tensile | Tensile from 80 to 1,000 °C and beyond | ASTM E21, ISO 6892-2 |
| Charpy V-notch and Izod | Impact toughness, ambient to cryogenic | ASTM E23, ISO 148, IS 1757 |
| Fatigue specimens | Force-controlled and strain-controlled fatigue | ASTM E466, ASTM E606 |
| Fracture toughness specimens | CTOD, J-integral, KIC | ASTM E1820, BS 7448 |
| Bend specimens | Guided bend, weld procedure and welder qualification | ASME Section IX, AWS D1.1, API 1104 |
| Creep and stress-rupture | Creep, stress rupture, creep-rupture ductility | ASTM E139, IS 3407 |
| Metallographic sections | Microstructure, weld macro, case depth, inclusion rating | ASTM E3, ASTM E407 |
| Corrosion coupons | Weight-loss, sour-service and stress-corrosion exposures | NACE TM0177, NACE TM0284, ASTM G31 |
What to send
Send the material, not a machined specimen, wherever the geometry allows it. The shop cuts to the standard, which removes the most common cause of a rejected test: a specimen machined to a drawing that does not match the standard the specification calls up.
Sample size guidance for each test is published in the sample size requirements (PDF), and samples can be collected through the sample collection centres (PDF). Where the parent component cannot be cut, the in-situ metallography bench reads the microstructure on the asset instead.
Related capabilities
The machine shop feeds every destructive bench in the laboratory.
- Mechanical Testing: tensile, hardness, impact, bend and compression
- Fatigue and Fracture Toughness: ASTM E466, E606, E1820
- Creep and Stress Rupture
- Metallurgical Evaluation: sections, weld macros, microstructure
- Welder Qualification: coupon preparation for WPS and PQR
Frequently asked questions
Does TCR machine its own test specimens?
Yes. TCR Engineering runs an in-house machine shop at the Mahape laboratory in Navi Mumbai with lathes, CNC wire-cut, stress-free grinding, milling and surface grinding. Specimen preparation is performed under the same NABL ISO/IEC 17025 quality system (certificate NABLT0726MH18640) as the test itself.
Should I send material or a finished specimen?
Send the material wherever the geometry allows it. The shop machines to the standard named in your specification, which removes the most common cause of a rejected test: a specimen cut to a drawing that does not match the standard the specification calls up.
Which specimen geometries can TCR prepare?
Round and flat tensile, elevated-temperature tensile, Charpy V-notch and Izod, force-controlled and strain-controlled fatigue, CTOD and J-integral fracture toughness, guided bend for weld and welder qualification, creep and stress-rupture, metallographic sections and weld macros, and corrosion coupons.
Why does specimen preparation affect the test result?
A mechanical test measures the specimen, not the material. An out-of-tolerance gauge diameter, a notch cut to the wrong root radius, or a machining mark that acts as a crack initiation site each change the number the machine reports, and no downstream analysis can recover the true value from it.