Used Weinig Rondamat 931 woodworking machines

WEINIG Rondamat 931 – High-precision profile knife grinder

The WEINIG Rondamat 931 is a high-precision profile knife grinder for producing and resharpening profile knives used in woodworking. A template transfers the profile shape to the knives mounted in the cutterhead, allowing users to produce their own profiles and resharpen existing knives while retaining the profile.

Machining and Machine Configuration

The grinding unit swivels to set the back and side clearance angles. A stepped pulley provides four grinding wheel speeds. Equipment includes a diamond dressing device with a vernier scale, taper-mounted grinding wheel holders and a coolant tank with a sludge compartment. A flat table with a roller-guided cross slide characterises the high-precision version. In addition to HL, HSS and Stellite knives, carbide knives can be machined with suitable grinding equipment.

Technical data for the standard version

Technical data for the standard version
Manufacturer	WEINIG
Model	Rondamat 931
Machine type	High-precision profile knife grinder
Tool cutting circle	90–290 mm
Maximum tool width	230 mm
Maximum grinding wheel diameter	225 mm
Grinding wheel bore	60 mm
Grinding wheel thickness	5 mm
Grinding wheel motor	1.1 kW (1.5 metric hp)
Grinding wheel speeds	1,720 / 2,000 / 2,500 / 2,820 rpm
Coolant tank including sludge compartment	100 litres
Back clearance angle	10–30°
Side clearance angle	Up to 20° to the left and right
Dimensions W × D × H	Approx. 1,100 × 1,080 × 1,650 mm
Net weight	Approx. 800 kg
Runout tolerance	Below 0.005 mm

Documented standard equipment includes grinding wheels for rough-grinding and resharpening HSS knives, two grinding wheel holders, a 40 mm mounting arbor, template material, a dressing diamond and tracing pins.

Special equipment and model variants

Variable speed control: Offered as optional equipment instead of the four fixed speed settings.
Larger tool widths: Optional equipment for 350 mm wide cutterheads; a version for 410 mm knife width is also listed. These capacities are not part of the standard version.
Template production: Tool kit including an electric hardening furnace.
Grinding accessories: Borazon and diamond grinding wheels and additional mounting arbors with a choice of diameters.
Straight planer knives: A fixture for grinding knives up to 230 mm long outside the cutterhead.
WEINIG Constant tooling: A setting device for tools with a repeatable cutting circle.
Constant measuring device: Documented specifically for the Rondamat 931 and also available as a retrofit.

Application and classification

The machine is intended for tool preparation and maintenance in woodworking businesses producing their own profiles. The technical data refer to the version in the joint German-language Rondamat 930/931 brochure; the year of manufacture and equipment of an individual machine may differ.