Vertical grinders
The part sits on a rotary table and gravity holds it down. For bearing races, cam profiles, and large heavy parts, vertical is the configuration that makes physics work for you.
What they're for
A vertical grinder holds the workpiece on a horizontal rotary table while one or more grinding heads work from above and the side. The defining applications: bearing-race grinding (the curved raceway profiles inside bearing rings), cam-profile grinding, gear bores and faces, and large components like hydraulic cylinders where the part is simply too heavy to spin between centers.
The physics is the selling point. A heavy part sitting on a table is inherently stable — no deflection between centers, no chuck distortion. For large-diameter precision work, that stability is the accuracy.
Size range
Vertical grinders span an enormous range. Compact machines handle bearing rings a few hundred millimeters across; large machines swing parts up to 2,500mm (about 8 feet) and carry loads up to 10,000kg. Published specifications for current Taiwanese-built verticals (for example the Dawn series) cite X/Z resolution of 0.0001mm with optical scales and hydrostatic rotary tables — the kind of numbers bearing work demands. Match the swing and table load rating to your heaviest real part, with margin.
What to compare when you're shopping
- Table swing and load rating. The two numbers that define the machine. Your heaviest part decides both.
- Table accuracy. Rotary table runout and whether it's hydrostatic — on race grinding, the table is the accuracy.
- Grinding heads. How many, their power, and whether the machine grinds ID, OD, and faces in one setup. Single-setup grinding is where the real money is on complex parts.
- Profile capability. If you're grinding races or cams, ask how profiles are programmed and dressed — this is specialized software, not a standard cycle.
- Automation. Loading a 500kg part by hand gets old. Gantry and robot integration options matter at the heavy end.
- Installation. These are foundation machines. Ask about foundation requirements, rigging, and who's responsible for what — before the purchase order, not after.
When vertical is the right call — and when it isn't
Right call: bearing races and rings, cam profiles, large heavy parts where gravity fixturing beats centers or chucks, parts needing ID/OD/face grinding in one setup.
Wrong call: long slender shafts — that's cylindrical work. High-volume small parts — centerless. Small bores in chucked parts — internal. Vertical machines are expensive to buy, rig, and install; don't buy one for parts a smaller process handles.
The foundation question. Vertical grinders in the larger sizes need engineered foundations. Get the foundation spec and the rigging plan quoted alongside the machine — it's a five-figure line item that surprises first-time buyers.
Related
- Grinding for bearings — race grinding is this machine's home turf
- Internal (ID) grinders — for smaller bores in lighter parts
- ST Grinders — handles the Dawn vertical line in North America