A metals separation line upgrade inside a working plant is mostly a sequencing problem. New conveyors, new separators and new electrical have to go in around equipment that is still earning money, in a building that was laid out for something else.

On this one ERS added a full separation stage: an eddy current separator, high-speed classification, screening, and more than a dozen conveyors — HSCS infeed, heavies and waste, screen overs and fines, zorba, and the ferrous discharge and waste lines — each with its own stands, chutes and transfer points.

What the drawings said and what the site allowed were not the same. Two cross-beams for the separator frame arrived fabricated wrong and were cut to size on site. Mounting brackets on the support beams did not line up with the conveyor holes, so new holes were drilled. The zorba conveyor, set exactly to drawing, left a three-inch gap to the separator frame. Ground had to be flattened and packed before the telehandler could reach the waste conveyors — and at one point it was stuck in the mud.

None of that is remarkable. It is what a retrofit is. The question is only whether the crew can fabricate, re-drill and re-route on site without the schedule moving, and whether someone is keeping the whole sequence in their head while the electricians work alongside them.

That is the part ERS carries. Metals processing systems, engineered, installed and commissioned as one line — including into plants that are already running.

A scrap system installation is only partly about the equipment. The rest is what you find when you walk into the building.

At a corrugated plant in Nevada, ERS was installing a complete line — shredder, baler, separator tower, filter and the duct that ties them together. On day one the crew found that the column the layout was referenced from was buried inside a wall, the drawing scale was wrong so nothing could be measured off it, and the support legs sat 12.5 inches away from where the footing drawing put them.

Every layout on the floor had to move 12.5 inches in one direction before anything could be anchored.

It did not stop there. The filter sat higher than its standard adjustable feet allowed, so taller feet had to be ordered. The electrical plan put the control panel where two sub-panels and a transformer already stood. And the site would have no permanent power for three months.

The crew worked around all of it: shims and anchors set to the corrected elevation, the platform and handrail built out, the filter and return air fan laid out, the separator lid match-drilled and fitted on site.

This is the part of a project that never appears in a quotation. Equipment arrives to a specification. Buildings do not. Dust collection and scrap handling systems get commissioned on time because the people installing them can re-measure, re-order and re-route without waiting for a new drawing set.

Part 2 of our series on how to choose a scrap shear goes inside the shear itself. It is the most punished part of the machine, and the part that decides what you spend on maintenance for the next twenty years. New, they all look up to the job. Time is the real judge.

Two cutting cylinders, not one. Twin cylinders balance the cutting system, cut contact friction and improve the piston guiding ratio for the same frame size. They also come out one at a time — a small cylinder is far easier to pull than a large one.

The guide ratio. Guide length to cutting width should be greater than 1.5. Below that, stress concentrates on the guides and the blade holder, and both wear out early. Six-sided prismatic guides, precision machined, spread the cutting forces into the structure and make adjustment simpler.

Synthetic on hardened steel. Dust particles embed in the plastic instead of seizing the guide, and the guides are self-lubricating. Steel on steel and bronze on steel are obsolete.

The blade angle. Reputable builders stay between 7° and 10°, with 9° to 10° the right compromise. Past 10°, the small gain in cutting capacity goes straight back out as friction and wear. Near 12°, material is driven against the shear wall and loads the blade holder off-centre.

The one to walk away from: welded guides, or no interchangeable wear plates on the surfaces that touch the scrap. Cheaper to buy, far more expensive to own.

ERS partners with TAURUS in the U.S. for shear balers and inclined shears, and engineers the feed, separation and dust collection around them as one line.

Parts 3 to 5 follow weekly.