The ultimate standard in heavy duty valve seats and guides.


The ultimate standard in heavy duty valve seats and guides.


SG8 XL-Smart is specifically designed for machine shops that build small to large cylinder heads within the heavy duty industry. From single cylinder to 24 valve six cylinder heads used in natural gas and mining, construction, and marine industries. Robins fixed pilot concept works the best to achieve ultimate chatter-free finish on valve seats within a few microns concentricity. Large 24 valve heads can be easily clamped and rolled full 360 degrees to allow work to be done on all sides of these cylinder heads.

Key Features

  •     Aircraft cylinder heads machining
  •     Canted head set up on SG8 XL
  •     Mini cylinder head machining on SG8 XL
  •     3 angle cutting inserts
  •     Adaptors and drivers
  •     Insert holders
  •     Nano precision carbide pilots
  •     Spherical holders
  •     Newly designed lapping device
  •     Large diameter concentricity gage
  •     Standalone touch screen
  •     Dual axis level

Technical Specifications

Cylinder head size

47 x 15 x 10"

Spindle tilt

± 15 degrees

Spindle stroke

8.500” (216 mm)

Spindle speed

35 - 500 RPM


Achieve < 0.0002” (5 microns) post plateau honing of valve seats


0.0002” (5 microns) for honed guides

Surface finish

< 0.4 Ra µm

Micro fine feed


Spring free adaptors


Constant varying speed


  • Availability: Available

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