How to Use a Wendt CNC Machine

• 1
  Key takeaways
• 2
  What a Wendt CNC machine actually does
• 3
  Pre-use checks before the first pass
• 4
  Workholding, wheel selection and offsets
• 5
  Safety rules that matter on a grinding platform
• 6
  Routine maintenance and troubleshooting
• 7
  Step-by-step operation
• 8
  When a Wendt machine fits the job, and when it does not

Wendt builds grinding platforms, not general-purpose mills. The spindle carries a diamond or CBN wheel, the table moves the workpiece in a controlled path, and the machine removes material by abrasion instead of a fluted cutter. That distinction matters when you plan a job. A Wendt machine shines on PCD and CBN cutting inserts, carbide dies, ceramic edges and hardened tool steel above 50 HRC, where a milling cutter would burn up or chip.

The control on most models handles interpolation, wheel wear compensation and dressing cycles in one program. You define the profile, the wheel path and the dress interval, then the machine repeats it. That repeatability is the selling point. On PCD inserts, a well-set Wendt machine holds a cutting edge within a few micrometres run to run, which is why shops use it for indexable inserts and rotary cutting tools.

If you are learning how to use a Wendt CNC machine for the first time, resist the urge to treat it like a VMC. There is no chip evacuation to worry about in the usual sense. Instead you manage wheel condition, coolant delivery, spark-out and heat. Get those four right and the machine behaves. Get them wrong and you will see burn marks, chipped edges and wheel loading within a handful of parts.

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  Material removal by grindingDiamond or CBN wheel, not a fluted end mill.
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  Best fitPCD, CBN, carbide, ceramic, hardened steel above 50 HRC.
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  Weak fitDeep pockets in aluminium, soft plastics, large 3D contours.

Walk the machine before you power it up. Look at the power cable and the coolant lines for wear or leaks. Press the emergency stop and confirm the spindle and axes stop immediately. If the stop feels soft or the machine coasts, stop there and call maintenance. A grinding spindle at full speed does not give you a second chance.

Check the wheel next. Look for glazing, loading, flat spots and edge chipping under good light. Run a hand over the wheel guard and the coolant nozzles; dried coolant or swarf in a nozzle will starve one side of the contact zone. On a Wendt machine the coolant must flood the contact point, not dribble near it. Aim the nozzle at the point where wheel meets workpiece, roughly 10–15° ahead of the contact line.

Clean the fixture and the mounting surfaces. A single chip under an insert seat tilts the part and shows up as a tapered edge later. Confirm air pressure sits in the range the machine manual specifies, usually 5.5–6.5 bar for clamping and door interlocks, and check that the wheel guard and door interlocks both report closed. Log the check in your setup sheet so the next operator sees what changed.

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  Emergency stopPress it, confirm instant stop, release and reset.
• 2
  Coolant nozzlesClear, aimed at the contact point, not beside it.
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  Fixture surfacesWiped clean, no chips under the seat.
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  Air and interlocks5.5–6.5 bar, guards closed, doors locked.

Pick the fixture to suit the part, not the other way round. Indexable inserts usually go into a dedicated pocket plate; round tools and shafts go into a collet or a V-block with a clamp. Clean every locating surface with a lint-free wipe and check for burrs on the part edges. A burr of 0.02 mm under a seat will tilt a thin insert enough to scrap the edge.

Wheel choice follows the workpiece. Diamond wheels cut carbide, ceramic and PCD. CBN wheels cut hardened steel and high-speed steel. Match grit and bond to the finish you need. A finer grit gives a better surface but loads faster and needs more frequent dressing. For a typical carbide insert edge, a resin-bond diamond wheel in the 400–600 grit range is a reasonable starting point; go finer only if the print demands it.

Set your offsets the way you would on any CNC, but remember the wheel wears. Touch off the wheel to a known datum, enter the offset, then dry-run or use simulation mode to watch the path. Confirm there is no unexpected travel and no collision with the fixture or the guard. On a Wendt machine, a single wrong offset in the Z axis can drive the wheel into a hardened fixture and crack it before you can hit the stop.

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  Diamond wheelCarbide, ceramic, PCD. 400–600 grit resin bond as a start.
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  CBN wheelHardened steel above 50 HRC, HSS, some superalloys.
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  Dry run firstWatch the full path in simulation or air-cut mode.
• 4
  OffsetsTouch off on a datum, log the value, verify before cutting.

A grinding wheel stores energy. If it bursts, the fragments leave the guard at speed. Never run the spindle with the guard open or the door interlock bypassed, even for a quick check. Keep the wheel speed within the rating marked on the wheel, and never exceed the maximum spindle speed in the machine manual.

Dress the wheel before it glazes, not after. A glazed wheel rubs instead of cutting, heats the part and pushes the force up. That force goes into the fixture and the spindle. On a Wendt machine, a dull wheel often shows up as a burning smell before it shows up on the gauge.

Keep the work area clear of loose tools and rags. Grinding swarf and coolant make the floor slippery, so wipe spills immediately. Wear eye protection and a face shield when dressing, and use the dust extraction if the machine has it. Carbide and ceramic dust is not something you want to breathe.

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  Never bypass the guardWheel speed rating and guard rating are not optional.
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  Dress earlyGlazing raises force and heat on the part and the spindle.
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  Manage the floorCoolant and swarf make slips the most common injury.

Daily: check coolant level and concentration, clear the nozzle, wipe the guard and check air pressure. Weekly: check wheel wear and re-dress, inspect belts and couplings, and look for coolant leaks at the fittings. Monthly: check way lubrication, spindle runout and the condition of the fixture locating surfaces. Log every check so trends are visible.

Calibrate the axes on the interval your quality system requires, and always after a crash or a spindle change. A machine that has been sitting for weeks should be re-checked before production. Thermal drift on a cold machine can move a dimension more than the tolerance band on a tight part.

When something goes wrong, work from symptom to cause to action. A burning smell with a polished edge points to a glazed wheel; dress it and reduce infeed. A chipped edge on one side points to a tilted part or a loaded wheel section; check the fixture and re-dress. A dimension that drifts over a run points to wheel wear or thermal growth; re-check the offset and let the machine stabilise.

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  DailyCoolant level, nozzle clear, guard wiped, air pressure checked.
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  WeeklyRe-dress wheel, inspect belts, look for leaks.
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  MonthlyWay lubrication, spindle runout, fixture surfaces.
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  After any crashRe-calibrate axes and re-check spindle runout.