Technical
Your CBN Inserts Are Breaking. The Cutter Is Not the Problem.
Edge chipping on CBN almost never starts at the insert. Where to actually look, entry angle, coolant, and the way the cutter meets the casting.
Everything we've written down about metal cutting.
Articles, case studies and notes from the shop floor, root-cause guides, component tool-ups with full operation sheets, product deep-dives and company news. Filter by what you need, or read the lot.
Technical
Technical
How Sigma Tooled Up A 16 Cylinder Mining Engine Block. Zero Compromises.
Sixteen liner bores, one datum, and a component too big for any standard tool in the catalogue. The full tool-up.
Technical
Your Boring Bar Is Running At 5mm Per Minute. Here Is What That Actually Means.
A feed rate that low is not caution. It is the machine telling you the tool cannot hold the cut, and what it costs you per shift.
Technical
Why Your Boring Operation Keeps Getting Chatter Marks, And Changing The Insert Will Not Fix It
Chatter is a stiffness problem wearing an insert costume. Root-cause sequence for finding where the deflection actually lives.
Technical
Why Your Boring Operation Keeps Producing Inconsistent Dimensions
Dimension drift across a shift usually has nothing to do with the tool. Thermal growth, setting method and where the drift really comes from.
Case Study
4 Cylinder Block
Set-up OP-10. Milling and drilling, with the full operation and tool list.
Case Study
3 Cylinder Block
Set-up OP-10. Milling, drilling and tapping across the block in one fixture.
Case Study
DV 10 Cylinder Block
Set-up OP-10. Milling operations on a ten-cylinder block.
Case Study
TLB Transmission
Set-up OP-10. Milling, drilling and holemill on a backhoe loader transmission.
Case Study
Case Transmission
Set-up OP-10, top and top. Full operation sheet for the transmission case.
Case Study
Gas Head
Set-up OP-10, top and bottom side. Gas engine head machining sequence.
News
Wishing you all a very happy 2026
A new year note from the Sigma team, and what we are lining up for the year ahead.
News
Coming up: Sigma's New Facility
The next manufacturing facility, what goes in it and what it means for lead times.
Technical
Coolant Strategy = Surface Finish (and Tool Life)
Pressure, volume and where the coolant actually lands. The variable most shops never audit.
Technical
Micro Boring Units: 5 Mistakes Killing ROI (and Fast Fixes)
Five habits that quietly cancel out the accuracy you paid for, and how to correct each one.
Technical
Inventory: The Hidden Cost Center in Tooling
What sits in the tool crib is working capital doing nothing. ABC, min-max and tool-life forecasting.
Technical
7 Ways to Cut Tooling Cost Without Hurting Capability
Seven levers that reduce spend without touching Cp/Cpk, starting with the ones nobody looks at.
Technical
Tooling & Insert Traceability: The Shortcut to Root Cause
When a batch goes out of tolerance, traceability is the difference between an afternoon and a fortnight.
Technical
Selecting a Metal-Cutting Partner: Buy Outcomes, Not Catalogs
What Tier-1 engine vendors should be asking a tooling supplier, and what a good answer sounds like.
Technical
CBN Milling Cutters: What Really Matters (So You Don't Burn Money)
Grade, pitch, wiper geometry and rigidity. Which of the four actually decides your cost per edge.
Product Note
Twin Leaf Boring Bars
Clearance, spindle synchronisation and co-linear axis alignment, how to install a twin leaf bar correctly.
Product Note
Ring Grooving Tool
High-precision ring groove cutting for oil and gas, holding tight tolerance on groove width and depth.
Product Note
Cylinder Head Tooling, Valve Seat, Guide & Cam Bore
The critical tolerances on a head, and how to hold them without pricing yourself out of the job.
Product Note
Fine Boring Units
What a fine boring unit does after the rough pass, and why adjustability decides the finish.
Product Note
Indexable Drills & Holders
Index the edge instead of scrapping the drill. Where indexable pays back against solid carbide.
Product Note
Plunge Milling Chamfer Tool
Compact high-speed chamfer tools that cut straight down into the part, closer to boring than milling.
News
Expanding Horizons: Sigma Toolings is now in the Global Market
Ten-plus countries, AI-integrated R&D and the after-sales structure behind the expansion.
News
Celebrating Sigma's 60% Growth in FY 25-26 Q1
Sixty percent in a single quarter, and why it wasn't a surprise to anyone inside the business.
Nothing in this category yet.
Watch
Tools in the cut, not in a catalogue photo.
Component tool-ups filmed on the machine, plus the moments worth marking.
Cylinder Block
Full block tool-up, running on the machine.
Watch →Cylinder Head
Valve seat and guide tooling in operation.
Watch →Fine Boring Unit
Setting and running a micro boring unit.
Watch →Banjo Housing
Housing bore and axle tube machining.
Watch →Case Differential
Differential case tooling in the cut.
Watch →Contract Signing with Microbore Corporation, London
Partnership announcement.
Watch →
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Spec sheets you can hand to a process engineer.
Where to go next
Reading is cheaper than a failed trial. Both beat guessing.
SOLUTIONS
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Seven complete component packages, every operation, rough to finish.
Browse solutions → PRODUCTSThe full product range
Eleven product lines with specs, ranges and recommended parameters.
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600+ customers across tractor, automotive, genset, off-highway, oil & gas and aerospace.
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