Which rail grinding wheel fits Geismar and Robel portable equipment?

Which rail grinding wheel fits Geismar and Robel portable equipment?

Which rail grinding wheel fits Geismar and Robel portable equipment?

RailwayCare/Molaton manufactures grinding wheels for Geismar MP12, MP23, and S2M models (125-230mm, 22.23mm bore) and Robel 13.44, 13.48, and 13.61 series (150-300mm, 22.23-25.4mm bore). All wheels meet OEM specifications for arbor size, max RPM, and thickness. Custom bushings available for non-standard arbors.

Geismar Equipment Compatibility

  • Geismar MP12 (angle grinder): 125/150mm cup, 22.23mm bore, max 12,200 RPM. Recommended: ZA-25 F30 cup 125x22.23x30mm.
  • Geismar MP23 (profile grinder): 150/180mm dish, 22.23mm bore, max 8,500 RPM. Recommended: ZA-25 F46 dish for profile finishing.
  • Geismar S2M (switch grinder): 230mm cup, 22.23mm bore, max 6,600 RPM. Recommended: ZA-40 F36 heavy-duty cup for frog/switch.
  • Geismar THS (hydraulic): 230/300mm cup, 25.4mm bore. Recommended: ZA-40 F24 for heavy defect removal.

Robel Equipment Compatibility

  • Robel 13.44 (rail head grinder): 150mm cup, 22.23mm bore, max 8,500 RPM. ZA-25 F36 cup recommended.
  • Robel 13.48 (universal): 150/230mm, 22.23mm bore. Supports cup and dish types. ZA-25 F30/F46 options.
  • Robel 13.61 (profile grinder): 230/300mm cup, 22.23 or 25.4mm bore (verify model year). ZA-40 F36 profiled cup.
  • Robel 13.65 (switch grinder): 230mm cup, 22.23mm bore, max 6,600 RPM. ZA-40 F30 heavy-duty for frog points.

Critical Fitment Safety Checks

  • Bore match: Must match arbor exactly—22.23mm or 25.4mm. Never force-fit or modify bore.
  • Guard clearance: Wheel thickness (20-75mm typical) must fit within grinder guard. Exceeding guard = safety hazard.
  • RPM rating: Wheel max RPM must exceed grinder no-load RPM by 15%+. Marked on every wheel label.
  • Flange condition: Inspect for wear; equal diameter flanges required for proper clamping force distribution.
  • Ring test: Tap wheel before mounting—clear metallic ring = structurally sound; dull sound = cracks present.

RailwayCare Standard Stock for Portable Grinders

  • 125x22.23x30mm Cup ZA-25 F30 (Geismar MP12, Robel universal)
  • 150x22.23x40mm Cup ZA-40 F30 (Geismar MP23, Robel 13.44/13.48)
  • 230x22.23x50mm Cup ZA-40 F24 (Geismar S2M, Robel 13.61/13.65)
  • 230x22.23x60mm Dish ZA-25 F46 (profile finishing, all compatible)
  • Custom bushings: 22.23-to-25.4mm, 22.23-to-20mm, 25.4-to-22.23mm

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