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Repair · 3 min read

Repair or replace? How to decide on a worn precision part

When to repair a worn machined part and when to replace it: a simple guide based on damage type, cost, downtime, and how critical the part is.

The short answer

Repair a worn precision part when the damage is local (a worn bore, scored shaft, or damaged thread) and the base material is sound. Replace it when it's cracked, badly deformed, the wrong material, or has failed repeatedly. When downtime is expensive, repair now and remake a spare in parallel.

By the Micro Tool Engineering team · Riviera Beach, FL ·

Usually repairable

  • Worn bores (bored oversize and sleeved)
  • Scored or worn shafts (re-machined, sleeved, or built up)
  • Damaged threads (re-cut or inserted)
  • Worn keyways and flats

Usually replace

  • Cracks or fatigue damage
  • Bent or distorted parts
  • Parts made from the wrong material
  • Parts that keep failing the same way

The smart middle path

If the machine is down, repair the part to get running, and have a new one made as a spare at the same time. Next time, it's a swap instead of an emergency.

Have a part like this? Send the print and an engineer will reply, typically within 48 hours.

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