Adapt the machine or buy a new one

How this actually starts

The case that best explains it among our projects started in the simplest possible way.

Three impact-printing machines for paper cards. The printhead pins strike an inked ribbon and transfer the numbering onto the substrate. They worked well and had done so for years.

The consumable manufacturer stopped supplying the ribbon cartridge. And nobody noticed, because there was stock. The department found out when it placed a replenishment order and was told it no longer existed.

That is the point worth underlining: the risk had been there for months, unseen. Stock does not protect you; it merely delays the warning. And when the warning arrives, you are already racing against the clock.

In this case, the stoppage lasted a week. It could have been much worse.

The two questions that decide it

When you have to choose, almost everything comes down to two things.

First: is the machine still good at its job?

Not “is it modern” or “does it look nice”. If the mechanics are sound, it maintains the precision you need and the process remains valid, the equipment is not obsolete: it is simply missing a part.

That was the situation here. All three machines printed perfectly. The only thing that no longer existed was a cartridge.

Second: is the problem bounded?

Adapting is reasonable when the problem has boundaries: a housing, a transmission, a consumable. It stops being reasonable when everything you touch uncovers something else.

Here it was bounded. The customer had found an alternative cartridge on the market. Its geometry was different, so it did not fit, but it existed and had a stable supply. That turns “there is no consumable” into “the holder needs adapting”, which is a very different and much smaller problem.

What was done

A new cartridge holder, designed to accommodate the alternative consumable and position it correctly relative to the printhead and the card path.

And a second thing that was not in the initial brief but the process called for: a clutch in the ribbon drive. A motor keeps the ribbon moving, and if a card gets trapped because of an incorrect setting or a double feed, the drive keeps pulling and tears it. The clutch slips when resistance exceeds its setting and limits the force transmitted.

It is a simple mechanical intervention and does not replace setting the printhead height correctly. But it prevents an operating error from becoming a breakage.

Two decisions that saved the project

This is what I really wanted to explain, because these decisions recur in almost every adaptation.

First: do not wait for the commercial clutch.

The appropriate clutch had a two-to-three-month lead time. Accepting that would have meant leaving the machines stopped for that whole period, which was precisely the problem we were there to solve.

So a custom clutch was developed using printed parts and springs. The adaptation started working without waiting for anyone.

The interesting part came later: when the commercial clutch arrived, it was fitted to one of the three machines and the other two retained the custom version. Based on the adjustment experience in this project, the springs allowed finer torque adjustment than the commercial variant. No more units were purchased.

Second: the prototype stayed in service.

The assembly was FDM-printed in engineering ABS, intended as a prototype before a final machined aluminium version. The plan was to test, validate and then manufacture it “properly”.

Its behaviour in service made that step unnecessary. It has been working in engineering ABS for approximately four years, and the aluminium version was never needed. That cost was simply never incurred.

The lesson from both decisions

Neither of those decisions is made from an office. They are made when the person designing is also the person manufacturing, installing and standing there when the machine starts.

If one person designs, another manufactures and a third installs, the custom clutch is never proposed — because it is not “what was specified” — and the prototype is replaced with aluminium — because that was the plan. More is spent and nothing is gained.

When NOT to adapt

So this does not look like blind advocacy for repairing, these are the cases where buying is the right choice:

• When the mechanics are worn. If there is play, backlash and general wear, adapting is cosmetic. The next failure is around the corner.
• When each repair uncovers another. If the scope grows at every meeting, the problem was not bounded and the adaptation becomes a bottomless pit.
• When the product changes, not the part. If the equipment cannot do what you now need, adapting it means asking it to do something outside its nature.
• When there is nobody to maintain it. A custom adaptation needs someone who understands it. If that is not addressed, you have created a new dependency.
• When safety or regulations require it. There is no debate then.

The question to keep in mind

It is not “how much does fixing it cost?” versus “how much does buying it cost?”.

It is: what part of this machine has stopped being useful — the entire machine, or one part?

If it is a part, there is almost always a way forward. And that route usually costs a fraction of replacing even one machine, let alone three.

At 7Axis Industrial we adapt existing machinery when the equipment remains sound and the limitation is a part, a consumable or an interface. We design, manufacture, install and take responsibility for the assembly.

View the full RC-003 case → Machinery modifications and upgrades →