7 Essential Delem DA 58T Tips to Maximize Your Bending Efficiency

Most shops set one backgauge position for the whole program and never touch it again. On a flat panel that works. On a part with cutouts, a formed flange or a window in the middle, that single position is where scrap comes from. The DA 58T lets you define X and Z coordinates for each finger separately, so the middle fingers can retract while the outer ones still support the sheet.

Think about a panel with a central window. If all fingers sit at the same X, two of them land inside the opening and give you nothing. Pull those two back and push the outer fingers forward, and the part sits flat through the whole bend. The sheet stops rocking, the angle stays consistent along the length.

The cost is front-end programming time. Budget it for parts with openings, notches or pre-bent flanges. For a plain 90° bracket, one finger position is fine and extra coordinates just slow the setup down.

The simulation screen is not a formality before you press start. It is the fastest way to find out that your sequence will crash the part into the upper tool or the machine frame. A sequence that looks fine on the drawing can be impossible on the brake once the third flange exists.

Enter the full part data first: flange lengths, bend angles, inside radius, material. The simulation grows the part step by step. Collisions show up in red. Reading the red is the easy part. The useful skill is choosing a sequence that keeps the part rigid and reduces how many times you flip it.

Take a rectangular box. Bending the two short sides first creates a U shape that holds itself, and the formed flanges become reference surfaces for the longer bends. Do the long sides first and you fight a floppy sheet for the rest of the job.

One caution: simulation assumes your tooling data is correct. If the die width or punch radius in the library is wrong, the simulation will happily approve a sequence that does not work on the floor.

Material thickness varies within a single sheet, and it varies more between batches. Automatic angle correction measures the actual result and adjusts the ram depth for the next stroke. Used properly, it removes the slow trial-and-error that eats the first ten minutes of every setup.

The practical rule is to bend a scrap piece from the same batch first. Let the control correct on that piece, then run production. If you correct on the first good part, you risk scrapping a part to teach the control something a scrap piece could have taught it.

AAC does not fix bad tooling or a worn machine. If angle error is consistent across the whole sheet, the problem is usually the die, the punch radius or the crowning setting, not the correction loop. Fix the cause before you lean on the correction.

Thickness measurement helps here too. Feed the measured value into the program rather than the nominal value from the drawing, and the first stroke lands closer. This matters most on stainless and on hot-rolled steel, where thickness tolerance is wider than on cold-rolled sheet.

If the same family of parts comes back every month, program it once as a macro. Parameterize the flange lengths and the bend count, then call the macro with new numbers. The operator loads the program, types four values and starts. That is where the DA 58T saves real hours, not in clever one-off programming.

The catch is discipline. A macro built on a part that was never quite right will reproduce that error forever. Build the macro from a program that has already run good parts, and document what each parameter controls. A macro nobody understands is worse than no macro.

Tooling data deserves the same treatment. Every punch and die in the rack gets a record: angle, radius, height, load limit, which machine it belongs to. When the library matches reality, the control calculates ram depth and tonnage correctly and the simulation means something. When it does not, every program is a guess.

We keep the tooling library tied to physical rack positions. If a die moves, the record moves with it. That one habit removes a whole class of setup errors, especially on nights and weekends when the usual operator is not there.

On a long bend, the ram and the bed deflect under load. The middle of the part gets a larger angle than the ends. Crowning compensates by lifting the bed in the center. The DA 58T calculates the required crown from part length, material, thickness and tonnage, and you can trim it manually afterwards.

Get the crowning right before you chase individual angles. If the middle of a 2,000 mm bend is 2° off and the ends are correct, no amount of angle correction per bend will fix it, because the error is mechanical. Crown first, then correct.

The last tip is about restraint. When a part runs slightly out of tolerance, the temptation is to rewrite the program. Most of the time the fix is a modification: a small offset on one bend, a different correction value, a tweaked backgauge position. Keep the original program intact and layer the modification on top.

Rewriting loses the record of what the part was supposed to be. Six months later, nobody knows why the program says 88.5° where the drawing says 90°. Modifications keep the intent visible, and you can remove them when the tooling or the material batch changes.