From first sketch to measured part.

MDM designs mechanical components and assemblies, proves them by analysis, and carries them through manufacture and inspection. The design intent stays intact from CAD to the finished part.

Request a quote See what we do

Tolerance what matters

Datums follow how the flange locates in service. Only the bore, face and bolt pattern carry tight callouts, which keeps the part affordable.

Bore fit: Ø40 H7 (+0.025 / 0)
Bolt pattern: Position Ø0.1 to A
Datum face: Flatness 0.02
General tolerances: ISO 2768-mK

Feature	Limit	Measured	Result
Ø40 H7	+0.025/0	+0.012	Pass
Position	Ø0.100	Ø0.041	Pass
Flatness	0.020	0.009	Pass

Sample data for illustration.

Engineering services, joined up

Bring us a sketch, a worn-out part or a released drawing. Each service stands on its own, and they share one set of data when you need the full route.

Mechanical design

Parts, assemblies and machines taken from requirements through concept, detailed 3D CAD and release, with manufacture and assembly considered from the start.

You receiveNative CAD and STEP files, 2D drawings with GD&T, bill of materials
Engineering analysis

Structural and thermal FEA, fatigue checks and tolerance stack-ups that answer a specific question: will it hold, will it fit, and where can weight or cost come out?

You receiveCalculation report with load cases, assumptions and recommended changes
Reverse engineering

Rebuild legacy or undocumented parts from physical samples, using measurement and 3D scanning, then correct the wear out of the model so the replacement fits as designed.

You receiveClean parametric model and a drawing ready for manufacture
Prototyping

Test form, fit and function quickly with 3D printing, machined one-offs or soft tooling, and feed what you learn back into the design before committing to production.

You receivePhysical prototypes and a list of design revisions
Manufacturing

CNC machining, sheet metal, welded fabrication and casting, from single parts to production batches, with the process chosen to suit quantity, material and tolerance.

You receiveFinished parts or assemblies, with process routing on request
Inspection and documentation

Dimensional inspection against the released drawing, first-article reports and material records, so every critical feature has evidence behind it.

You receiveInspection report and material certificates where supplied

Six stages, each with a clear gate

You see the work and approve it at each gate. If a requirement changes, the change is revised in the data and carried through to every downstream document.

Brief
We capture function, loads, environment, quantity, budget and target date.
Gate: agreed requirements
Concept
Layouts and options are compared on function, cost and manufacturability.
Gate: chosen concept
Detail design
Full CAD, analysis, DFM review and tolerance stack-up.
Gate: design review
Release
Drawings, bill of materials and revision control are issued.
Gate: Rev A signed off
Prototype
A first article tests fit and function, and the results update the design.
Gate: first article accepted
Production
Parts are made, inspected against the drawing, documented and delivered.
Gate: inspection report

What tolerance do you really need?

Tighter is not automatically better. Each step down the scale can add an operation, a slower cut or more inspection. Move the slider to see which processes can hold your number.

Required tolerance ±0.05 mm

Bars run from the tightest practical tolerance to normal shop practice, on a logarithmic scale in ± mm. This is a general guide for features up to about 100 mm. Size, material and setup all shift these ranges, so we confirm tolerances for each job.

Materials we commonly specify

Material choice affects strength, weight, corrosion life and machining cost. These are common starting points, and we can work to your specification.

Material	Density, g/cm³	Good for	Usual routes
Aluminium 6061-T6	2.70	General structural parts, good corrosion resistance	Milling, turning, welding
Aluminium 7075-T6	2.81	High strength at low weight	Milling, turning
Alloy steel 4140	7.85	Shafts, gears, heat-treated parts	Turning, grinding
Stainless 316L	8.00	Corrosive, marine and hygienic service	Machining, sheet, welding
Ductile iron	7.10	Housings and heavy sections, good damping	Sand casting, machining
Bearing bronze	8.90	Bushes and wear surfaces	Casting, turning
Titanium Ti-6Al-4V	4.43	High strength-to-weight, corrosion resistance	Milling, turning
Acetal (POM)	1.41	Low-friction, dimensionally stable plastic parts	Machining, moulding
PEEK	1.31	High-temperature and chemically resistant plastic parts	Machining, moulding

ISO 1101Geometric tolerancing
ASME Y14.5Dimensioning and tolerancing
ISO 286Limits and fits
ISO 2768General tolerances
ISO 8062Casting tolerances

Tell us what you need to make

A rough sketch and a clear problem are enough to start. More detail gives you a more accurate quote.

What the part does and what it connects to
Quantity, now and over the product's life
Material, finish and operating environment
CAD files or drawings, if you have them
The date you need parts in hand

From first sketch to measured part.

Tolerance what matters

Find the weak point early

Plan the setups around the datums

Measure against the drawing

Engineering services, joined up

Mechanical design

Engineering analysis

Reverse engineering

Prototyping

Manufacturing

Inspection and documentation

Six stages, each with a clear gate

Brief

Concept

Detail design

Release

Prototype

Production

What tolerance do you really need?

Materials we commonly specify

Tell us what you need to make