Guide

How to get an obsolete or imported part made in Pakistan

This situation is routine in Pakistan: the machine is sound, one part has failed, and the part is either discontinued, backordered for months, or priced as though it were made of silver. Having it made here is usually possible. Whether it is sensible depends on a few things worth thinking through first.

When having it made is the right call

Reverse engineering earns its keep in these cases:

The original is discontinued, or the agent quotes months of lead time
The import price plus duty and freight is far above local manufacture
You need several over time, so the pattern cost is spread across them
The part has failed more than once, and you want the material or the section reconsidered
The machine earns more per day standing idle than the whole job costs

When it is not

An honest foundry will tell you when to buy the original instead. Parts that are heat-treated and ground to fine tolerances, parts with a safety certificate behind them, and precision assemblies like bearings or injectors are usually better bought. The same is true if the part is cheap and available: paying for a pattern to save a little on a part you need once makes no sense.

What to send

A physical sample is the single most useful thing, and a broken or worn one still works. Send it with whatever context you have.

The part itself, including the broken pieces if it snapped
What machine or vehicle it belongs to, with the model and year
What the part does and how it failed
Any drawing, manual page or part number you have
How many you need, and whether more will follow
Photos of the part fitted in the machine, if you can take them before removing it

What happens then

At a foundry that casts and machines on one site, the route is roughly this:

Measurement: every functional dimension is recorded from the sample
Modelling: a CAD model is built, and worn or broken surfaces are restored to their original shape
Review: where the part carries load, the section and material are reviewed before any tooling is cut
Pattern: a pattern and core boxes are made, which is the one-time cost in the job
Casting: the part is poured in the chosen iron or aluminium
Machining: bores, faces and threads are cut to size
Fit check: the finished part is compared against your sample before it ships

What drives the cost

Expect the first part to cost noticeably more than the ones after it, because the pattern is made once and then belongs to your job.

Pattern and core boxes: one-time, and the main reason quantity changes the price per piece
Weight and material: SG iron costs more than gray iron, aluminium is lighter but priced differently
Machining: how many surfaces must be cut, and how accurately
Quantity: ten parts from one pattern cost far less each than one part

Questions worth asking any supplier

These separate a workshop that will manage from one that will deliver:

Do you make the pattern in-house, or send it out?
Do you cast and machine on the same site?
What material will you use, and why that one?
How will you check the finished part against my sample?
Who keeps the pattern, and what does a repeat order cost?

Common questions

Can a worn part still be copied accurately?

Yes. Wear is predictable: a shaft seat wears round, a face wears flat. Those surfaces are restored to their original geometry in the model rather than copied as they are. A part worn beyond recognition is harder, which is why a second sample or a drawing helps.

How long does it take?

It depends on the part, the pattern and the machining. Ask for a stage-by-stage timeline rather than a single number, and ask what the foundry needs from you at each stage, since approvals are often what delays these jobs.

Will the local part be as good as the original?

For most cast and machined parts, yes, provided the material is right and the critical features are checked. Where the original was heat-treated or ground to a fine tolerance, say so at the start, so the supplier can tell you honestly whether they can match it.