The best replacement for rotary is piston.

The best alternatives to rotary are rated as following:
★★★★★  piston
★★★★  foil
★★★★  foil shavers
★★  foil shaver
★★  roundabout
★★  reel mower
★  dtmf
★  coil
★  coil tattoo machine
★  foil razor
★  piston engine
★  bendpak
★  v8
★  foil electric shaver
★  coil machines
★  static phase converter
★  cylinder
★  lions
★  lions club
  coil tattoo machines
  scroll compressor
  coil machine
  drop spreader
  fixed wing
  rotaract
  dual action polisher
  cylinder mower
  linear shaver
  vtec
  rack steering
  reel mowers
  sonic toothbrush
  ls1
  reciprocating compressor
  laser engraving
  static ups
  flymo
  guillotine cutter
  carousel
  cylinder mowers
  hover mower
  kiwanis
  foil sensitive skin
  cylinder lawnmower
  piston compressor
  microscreen
  foil razors
  slide carb
  oscillating
  reciprocating

Your alternative for rotary is not listed? Suggest!
Speaking about rotary, one probably shouldn't forget about apex locator.

Other search terms related to rotary and their ratings are:
★★★★★ apex locator
You have in mind a companion for rotary and it is not yet here? Propose!



Google Trends

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rotary
piston
foil