Manufacturing Process
CNC / VMC / HMC
Precision
Machining.
In-house. Inspection-verified. Assembly-ready. Every casting, forging, and bar stock component Amsol supplies passes through our CNC machining centre — because the tolerance on the drawing is the tolerance on the part. Not an approximation.
Scroll
CNC Turning
Ø1–1000mm · IT5/IT6 · Ra 0.8 µm · threads · tapers · grooving
VMC / HMC Milling
3-axis & 4-axis · pockets · profiles · bores · ±0.01mm position
Grinding & Honing
Cylindrical · surface · internal bore · Ra 0.1–0.8 µm · IT5
EDM & Special
Wire EDM · sinker EDM · deep hole drilling · broaching · gear hobbing
Process Deep-Dive
In-House Machining. No Subcontracting. No Tolerance Risk.
When casting and machining happen under the same roof, under the same quality system, with the same engineers — the drawing dimension is what the component measures. That is the Amsol difference.
CNC Turning Photo
Lathe in operation · shaft turning
Close-up tool & chips
600 × 420px · cool blue tones
Lathe in operation · shaft turning
Close-up tool & chips
600 × 420px · cool blue tones
CNC Turning
Turning — Amsol Machine Shop
⚙️ CNC Turning — Lathe
Shafts. Pins. Flanges. Ground to h6. Every Time.
CNC turning for rotational components — shafts, pins, bushes, flanges, valve stems, piston rods. OD/ID turning, facing, grooving, threading, taper and form turning. From 1mm diameter to 1,000mm, with cylindrical grinding for bearing journals and sealing surfaces where Ra 0.4–0.8 µm is required.
Ø1–1000
Diameter range (mm)
IT5/IT6
Tolerance grade
Ra 0.4
Surface finish (µm)
±0.005
Achievable (mm)
VMC/HMC Milling Photo
Complex housing being milled
Multi-axis · coolant · tooling
600 × 420px · teal tones
Complex housing being milled
Multi-axis · coolant · tooling
600 × 420px · teal tones
VMC / HMC Milling
Vertical & Horizontal Machining Centre
🔲 VMC / HMC — 3 & 4 Axis Milling
Housings. Manifolds. Prismatic Components. ±0.01mm.
VMC (Vertical Machining Centre) for medium prismatic components — pockets, profiles, stepped faces, bore patterns, threaded holes. HMC (Horizontal Machining Centre) for larger workpieces requiring multiple face access in one setup — gearbox housings, engine blocks, pump manifolds. 4-axis indexing for complex angular features.
4-Axis
Max indexing
±0.01
Position tolerance (mm)
Ra 1.6
Standard finish (µm)
H7/H6
Bore fit standard
Grinding Photo
Cylindrical grinding — shaft
Sparks · precision measurement
600 × 420px · warm sparks
Cylindrical grinding — shaft
Sparks · precision measurement
600 × 420px · warm sparks
Cylindrical Grinding · Surface · Honing
Precision Grinding — Amsol Machine Shop
💎 Grinding & Honing
Ra 0.1 µm. h5 Shafts. Hydraulic Bores. Sealing Faces.
Grinding is where Amsol's machining capability separates from standard subcontract shops. Cylindrical grinding for bearing journals and precision shafts to h5/h6 with Ra 0.4–0.8 µm. Surface grinding for datum faces, sealing surfaces, and flat parallels to 0.003mm flatness. Internal bore honing to Ra 0.1–0.4 µm and ±0.002mm diameter — for hydraulic cylinders, pump bores, and engine liners.
Ra 0.1
Finest finish (µm honing)
IT5
Shaft tolerance (h5)
±0.002
Bore honing (mm)
0.003
Flatness per 100mm (mm)
Wire EDM Photo
Electric discharge cutting
Spark discharge · dielectric fluid
600 × 420px · purple/electric tones
Electric discharge cutting
Spark discharge · dielectric fluid
600 × 420px · purple/electric tones
Wire EDM · Sinker EDM · Deep Hole
EDM & Special Processes
⚡ EDM & Special Processes
Hard Alloys. Complex Profiles. Internal Corners to R0.1mm.
Wire EDM cuts complex profiles through hardened materials — no cutting forces, no distortion. Internal corners to R0.1mm radius. Sinker EDM for die cavities, mould inserts, and blind complex geometries. Deep hole drilling for oil passages and cooling channels to L/D ratio 20:1. Gear hobbing for spur and helical gears to DIN 5–8 quality.
R0.1
Internal corner min (mm)
20:1
Deep hole L/D ratio
HRC 65
Max material hardness
DIN 5
Gear quality (hobbing)
Tolerance & Finish Reference
What Amsol Achieves — Standard vs Maximum Capability
Every figure below is achievable at Amsol's facility — verified by CMM before dispatch. Standard column is what we deliver as default. Achievable column is what we deliver on precision programmes.
| Parameter | Standard Capability | Maximum Achievable |
|---|---|---|
| Linear dimensions | ±0.05mm | ±0.005mm |
| Bore diameter (H7) | IT6 (H7) | IT5 (H6) — grinding + honing |
| Shaft diameter (h6) | IT6 (h6) | IT5 (h5) — cylindrical grinding |
| Surface roughness Ra | Ra 1.6 µm (finish milled) | Ra 0.1 µm (honed bore) |
| Flatness | 0.02mm per 100mm | 0.003mm per 100mm |
| Cylindricity / Circularity | 0.01mm | 0.003mm (precision ground) |
| Thread tolerance | 6H / 6g | 5H / 5g (precision thread) |
| Hole position | ±0.02mm | ±0.005mm (CMM-verified) |
| Gear quality (hobbing) | DIN 7–8 | DIN 5–6 (ground gears) |
Facility
The Amsol Machine Shop
Replace photo placeholders with actual Amsol machine shop photography. Recommended shoot: wide shop floor, individual machines, close-up tooling, CMM in use, inspector measuring component.
MACHINE SHOP WIDE SHOT
Full shop floor · CNC machines · 800 × 520px
Full shop floor · CNC machines · 800 × 520px
Amsol Facility · Rajkot
CNC / VMC / HMC Machine Shop Floor
VMC MACHINE
400 × 260px
400 × 260px
Machine
Vertical Machining Centre
PRECISION SHAFT
400 × 260px
400 × 260px
Product
Ground Precision Shafts
CMM INSPECTION
400 × 260px
400 × 260px
Quality
CMM Dimensional Inspection
WIRE EDM
400 × 260px
400 × 260px
Special Process
Wire EDM — Precision Cutting
Where Amsol Machined Parts Go
Industries Served by Amsol Machining
Machining is Amsol's quality gateway — every industry we serve depends on it. These are the sectors where Amsol's machined components are active today.
Pump shaft photo
Pumps & Valves
Pump shafts ground to h6 · valve bores honed · seal faces ground Ra 0.4
Turning + Grinding
Railway pin photo
Railways
Coupler pins turned to h6 · lock components machined · flanges faced
CNC Turning
Gearbox housing photo
Power Transmission
Gear shafts ground · gearbox bores H7 · bearing seats precision ground
Grinding + Hobbing
Aerospace bracket photo
Aerospace
Precision bores ±0.005mm · Ra 0.4 · full CMM FAIR on every part
VMC + CMM
Oil gas valve photo
Oil & Gas
Valve bores · seat machining · thread cutting · pressure face finishing
Turning + Boring
Auto component photo
Automotive
Transmission components · brake machined surfaces · PPAP Level 3
VMC + PPAP
In-House Quality
Every Machined Component Verified at Amsol.
Not outsourced to a metrology lab. Not estimated from tool offset history. Measured on our own CMM, profilometer, and hardness tester — before dispatch.
CMM Inspection
3D CMM measures all critical features. Report with balloon numbers vs drawing provided every batch.
Spectrometer
Material grade verified before machining. GG25, 4140, CF8M — confirmed by OES, not trusted from cert alone.
Surface Roughness
Profilometer measures Ra on every machined surface specification. Ra 0.4 confirmed — not assumed.
Hardness Testing
Brinell / Rockwell per batch. Confirms heat treatment results — Q&T and case hardening verified.
PPAP Level 3
Full PPAP from real CMM data. PSW, PFMEA, Control Plan, Cpk/Ppk — accepted globally.
ISO 9001:2015
Annual audit. All machining processes documented. Non-conformance protocol: we call you before we ship.
📷
CTA Background · Finished machined components · 1920×840px
Get Started
Your Machining Drawing.
Your Machining Drawing.
Our Tolerance.
Share your drawing. An Amsol engineer will confirm tolerance achievability, process route, and indicative cost within 24 hours. DFM feedback included.
✓ DFM in 24 hours
✓ NDA available
✓ ISO 9001:2015
✓ In-house CMM
Industry · Oil & Gas
Built for the
Oil & Gas
Industry.
AAR specifications. Safety-critical components. Millions of operational cycles. Field failures measured in derailments, not warranties. If your components run on freight rail — Amsol understands exactly what that demands.
Active USA Railroad OEM Supply
AAR Compliant Material & Documentation
DI 65-45-12 · Alloy Steel 4140 · C1060
Riveted Assembly Capability
17
POs Delivered
Active USA OEM
Active USA OEM
Zero
Quality Rejections
3 Years
3 Years
3+
Product Lines
Active
Active
Component Mapping
Railway Components Amsol Supplies
Every component mapped to the right process, material, and specification. If your part is listed — Amsol has made it, or something directly comparable. If it isn't — share the drawing and we will assess it.
CNC Turning + Q&T
Coupler Knuckle Pivot Pin
Alloy steel · Q&T · Brinell 277–332 · Tensile 140 KSI min · AAR standard
DI Sand Casting + Grind
Coupler Knuckle Lock
DI 65-45-12 · Parting lines ground flush · Markings in depressed panel
Fabrication + Assembly
Articulated Lock Lift Assembly
3-part assembly · ½" C'sunk rivets pressed & ground flush · Sub-assembled at Amsol
Sand Cast + CNC Machine
Coupler Wear Plates
Manganese steel (Hadfield) or alloy steel · Multiple grades: ⅜", ½", ⅝" · 7/16" Mn
Closed Die Forging
Forged Brake Shoe Key
AAR S-376 specification · Alloy steel · Heat treated · Safety-critical braking component
Injection Moulding
Centre Bowl Wear Liners
High-load engineering polymer · 16"×2" and 16"×2¼" · Horizontal liner variants
Injection Moulding
Heavy Duty Wheel Chocks
Engineering polymer · Heavy duty grade · Adjustable handle variants
Investment Cast + CNC
Knuckle Thrower E30 / F31
Ductile iron / alloy steel · Coupler activation component · E and F series
ACTIVE SUPPLY Currently shipping to active OEM customers
LAUNCHING First order confirmed — entering serial production
PROPOSING Ready to quote — submit drawing for assessment
Why Amsol for Railways
Three Reasons Railway OEMs Choose Amsol
Not generic manufacturing claims. Three specific, evidenced reasons relevant to the railway industry specifically.
01 / 03
AAR Specification Compliance — Proven
AAR S-376 forged steel. DI 65-45-12 ductile iron. Alloy steel 4140 Q&T to Brinell 300+. AISI C1060 quench and tempered. These are not materials we propose — they are materials we have supplied and documented. Every batch verified by in-house spectrometer and hardness testing before dispatch.
✓ AAR-specified alloy steel rail locking pins supplied and certified. Zero field failures after material upgrade from carbon steel.
02 / 03
Casting + Forging + Assembly — Under One Roof
Railway components require multiple processes — ductile iron castings, alloy steel forgings, CNC-machined pins, polymer-moulded wear components, and multi-part riveted assemblies. Amsol supplies all five process types through one quality system. One PO. One delivery. One accountable partner for the entire component mix.
✓ Active supply across 3 product categories simultaneously — casting, machined pin, and riveted assembly — to the same railroad OEM customer.
03 / 03
Full Traceability + Documentation
Railway quality auditors expect heat-number traceability, spectrometer-confirmed material certs, CMM dimensional reports, and hardness test results. Amsol delivers all of these as standard on every railway component order — not as optional extras. When your quality team audits Amsol, the records are complete and ready.
✓ ISO 9001:2015 facility audit by an active USA railroad OEM — passed. Ongoing supply with full documentation on every shipment.
Active Supply Record
Read the full case study →
An Active USA Freight Railroad OEM Has Been Ordering from Amsol for 3 Consecutive Years.
They came with one component. Audited Amsol's facility. Found zero issues. Kept ordering. Three product lines later — forged and machined pins, polymer-moulded wear liners, riveted lock lift assemblies — they are now qualifying a fourth. This is what a long-term railway supply partnership looks like.
17
Purchase orders delivered
Zero
Quality rejections
3 Yrs
Continuous supply
$458K
Revenue shipped
Amsol Industries · Rajkot, India
Railway Component Production — Active Export Programme
Material Capability
Railway-Specific Material Grades
Only the grades that matter for railway applications — not a full catalogue. Every grade verified by in-house spectrometer before production begins.
Alloy Steel 4140 / EN19
AISI 4140 · Q&T
Tensile (Q&T)655–1,000 MPa
Brinell HardnessHB 197–321
Impact ToughnessHigh
Rail locking pins · coupling hardware · structural forgings requiring Q&T
Ductile Iron DI 65-45-12
ASTM A536 Gr 65-45-12
Tensile448 MPa min
Yield310 MPa min
Elongation12% min
Knuckle locks · coupler components · safety gear bodies — AAR-relevant grade
Manganese Steel (Hadfield)
12–14% Mn / ASTM A128
Work HardeningUp to HB 500+
As-cast HardnessHB 180–230
Wear ResistanceExtreme
Rail crossings · coupler wear plates · switch components — work-hardens under impact