Short vs Long Sander Stroke: Compare the Finished Result

Sander stroke describes the size of the orbital movement, not the diameter of the sanding disc. A longer stroke can favor removal in a suitable application, while a shorter stroke can favor fine control. The useful comparison is the accepted finish from the complete setup, not the stroke number by itself.

Compare tools within their approved applications. A random-orbital sander and a long-throw polisher are not interchangeable merely because both advertise an orbit dimension.

Read the model-specific guidance

For a concrete example, Festool's ETS EC 150 information distinguishes 3 mm and 5 mm versions and their intended sanding applications. That comparison belongs to that tool family; it is not a universal ranking of every sander using those dimensions.

Check disc size, backing-pad fit, speed range, extraction connection, permitted pad hardness, and operating instructions. Keep a wet process out of the comparison unless the complete equipment is approved for it.

Make the comparison fair

Use representative scrap or a permitted test area. Start with the same material and defect. Use comparable fresh abrasives, the specified support pad, and working extraction.

Keep feed pattern and overlap consistent. Let the tool operate as instructed instead of leaning harder on the slower test to equalize removal. Added pressure changes the contact conditions and can obscure the difference you intended to measure.

Time the entire route to the required surface, including any refinement needed after the initial stage.

Do not blame every pigtail on stroke

If random curled scratches appear, inspect abrasive contamination, loading, pad condition, and dust extraction before concluding that the orbit is too large. A smaller stroke does not remove a hard particle trapped beneath the disc.

Also confirm attachment and extraction compatibility. The disc-hole compatibility guide explains why a matching nominal diameter is only part of the setup.

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Choose for the task you actually repeat

A broad preparation face and a delicate coated edge may need different tools or methods. Do not insist on one machine setting for both merely to simplify the equipment list.

Keep the accepted test pieces with the work instruction. If the faster-removing setup needs substantially more refinement, its first-pass advantage may disappear. If both pass, handling, access, extraction, and repeatability can decide the choice.

Recheck the comparison when you change abrasive family, pad, or substrate. Stroke is a useful specification, but the finished surface and the approved operating conditions determine whether it is the right specification for your work.