The 90 is for the 90 degree vertical to horizontal tilt feature.
?NEW? TW90 VERTICAL/HORIZONTAL GRINDER The 90 is for the 90 degree vertical to horizontal tilt feature. Frame is CNC Laser cut from ¼? steel plate, precision welded and powder coated. Drive: Comes standard (only) with 2 horsepower Variable speed (via variable frequency drive). Power output is 2 hp on 220 single phase and 1 ½ hp when run with 110 single phase power. Tracking: Unique drive-wheel-tracking and specially domes wheels provide exceptionally smooth and stable tracking in both vertical and horizontal grinding positions. Wheels: CNC machined billet 6061 aircraft aluminum wheels with dual bearings, precision shafts and retainers. Contact wheel: 8? smooth polyurethane standard. (Toolbars are available to use Bader contact wheels and small wheels.) Platen: 2? x 10? flat platen with 2? x 2? aluminum or polyurethane idler wheels. Small Wheel Attachment: This machine will accept Bader small wheel attachments. Tool Rest: Billet quick change tool rest provides multiple configurations for contact wheel and flat platen in both vertical and horizontal positions. Additional quick change tool rests are available. Single plane quick change tool rests are extremely convenient for basic grinding operations