ROTTLER VR9 (Artikelnummer: rottler_VR9)

Rottler's Centerless Grinding System rotates the valve stem on it's own centerline. Precision drive rollers rotate the valve stem and a pneumatic low friction steady rest support the valve stem similar to a precision balancing machine, resulting in extremely accurate valve stem to valve seat run out less than .0002" (.005mm) TIR. The Rottler Centerless System allows a wide range of valve stem diameters to be ground without changing any collets or chucks.

Features:

  • New Standards - The VR8 sets new standards for Performance Racing and Remanufacturing work. The Centerless Technology eliminates collets and chucks. Valve face is machined concentric to the valve stem for improved sealing, better heat transfer and reduces mechanical stresses on valves.
  • Grinding Wheels - The VR8 is supplied standard with vitrified wheels, grinding oil and diamond dresser. CBN wheels are optional and must be ordered separately. Special wheels available for grinding difficult metals such as Titanium, Inconell, etc.
  • Variable Valve Rotation Speed - allows the operator to adjust surface speed for different diameter valves for best surface finish for a wide range of valve head diameters from small multi-valve to large diesel valves.
  • Variable Wheel Rotation Speed - The Main and Stem/Butt End wheels are variable and are easily adjusted on the control panel to allow different surface speed on different diameter valves for best surface finish on a wide range of valve head diameters from a small multi-valve to large diesel and gas valves.
  • Canted Roller Drive System - eliminates the need to manually feed valve into or away from grinding wheel during refacing. Canted rollers feed valve against a precision stop which accurately controls valve length on every valve - automatically.
  • Centerless Grinding System - handles large range of valve stem diameters without changing any collets or chucks!
  • Open Sided Pneumatic Steady Rest - No need to switch off the motors when changing valves reducing machining time and increasing life of motors.
  • 8" (200mm) Large Diameter Main Grinding Wheel - Different grit size and bond strength wheels available for grinding different surface finish roughness requirements.
  • Stem/Butt End Grinding - Grind Valve Stem End square to the valve centerline. The V rest allow all valves in a set be be ground to the same distance from valve seat to stem end - essential for overhead camshaft type cylinder heads. Exact amount of material removed from the stem end can be measured with the micrometer adjustment system.
  • Stem/Butt End Chamfering - Grind Valve Stem End with chamfer to allow easy entry to new valve stem oil seals to ensure reliable installation for minimum oil consumption between valve stem and valve guide.
  • Large Valve Capacity - The VR8 Double Dovetail Slideway and micrometer feed system allow large valves up to 15" (385mm) long to be easily set up and ground.
  • Main Wheel Diamond Dresser - The fold away diamond dresser is set to the exact position of the wheel face to dress, just drop the dresser down into place and the diamond is positioned ready to dress minimum material from the main grinding wheel.
  • Base Cabinet - Standard Base Storage Cabinet includes a large 5 gal 20 litre removable coolant tank with replaceable paper filter system. Coolant tank has drain plug and is easily removed for quick cleaning. This large capacity filtered coolant system allows machine use for months and months with no cleaning or maintenance required saving time and money.
  • Large Capacity Coolant - tank and filter system built into standard storage cabinet.
  • Solid Cast Iron Construction - dampens harmonics, eliminates chatter, and maintains accuracy for a long service life.
  • Stroking Handle - Stroking handle moves the valve back and forth over the grinding wheel.
  • Main Wheel Diamond Dresser - The fold away diamond dresser is set to the exact position of the wheel face to dress, just drop the dresser down into place and the diamond is positioned ready to dress minimum material from the main grinding wheel.

Specifications:

Valve Stem Diameter Range (with Standard Chuck)   3.5 mm-16 mm
Valve Stem Length Range (with Standard Chuck) 50 mm-260 mm
Valve Total Length Range 70 mm-400 mm
Butt Grinding Wheel Diameter 100 mm
Valve Grinding Wheel Diameter 225 mm
Electrical Requirements 208-240V, 10A, 50/60Hz, 1Ph
D x W x H (mm) 915 x 864 x 1702
Machine Weight 299 kg

 

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VR9 PDF Brochure Download