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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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