Drake GS:CG
Image: drakemfg.com, Drake
Key Specifications
z axis travel
x axis travel
work table length
work table width
wheel centerline to table top
max part diameter
How much does the Drake GS:CG cost?
Price estimate
We do not have a price for the Drake GS:CG that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Drake GS:CG is a crown grinder, a CNC machine with 7 axes that grinds the drums used in making tapered roller bearings. It takes parts from 100 mm (3.9 in) to 355 mm (14.0 in) in diameter and up to 900 mm (35.4 in) bearing end-to-end, with a maximum grind length of 750 mm (29.5 in) centered on pivot.
What separates it from a thread grinder is the pivot. Drake's table lists a pivot axis (B) beside the linear axes and a programmable crown radius from 1.9 m (74.8 in) to 999 m (3,278 ft). Lead is programmable over 0 to 999 mm (0 to 39.3 in), and the ground form can be 63 mm (2.5 in) wide and 25 mm (1.0 in) deep.
The drives are named row by row. X and Z use Fanuc linear motors. The pivot is a ball screw with a Fanuc servo, the dresser axes W and Y use ball screws and Fanuc servos, and the rotary C axis is a servo through a gear box. The wheel head angle is set by a lead screw, manual or servo. Position feedback is by Heidenhain scales. The base is quartzite epoxy polymer, with cast iron tables and slides.
The wheel spindle is rated 22 kW (29.5 hp) on hydrostatic bearings and holds a wheel peripheral speed of 40 m/s (vc is constant). Wheels are 25 to 80 mm (1.0 to 3.1 in) wide on a 203.2 mm (8.0 in) bore, and the spent wheel diameter is 400 mm (15.7 in). The workhead turns at up to 200 rpm (50:1 gear box).
The machine weighs 12,000 kg (26,455 lb) and needs 52 kVA at 200-600 V. Coolant demand is 100 lpm @ 7 bar (26.4 gpm @ 101.5 psi) for the grind and 30 lpm @ 1-2 bar (7.9 gpm @ 14.5-29.0 psi) for bed wash. Drake says the redesigned controller swings from the front of the machine to the side, so the operator can reach the wheel, dresser and part during setup.
Full Specifications
| Parameter | Value |
|---|---|
| Z Axis Travel | 750 mm (29.5 in) |
| X Axis Travel | 160 mm (6.3 in) |
| Work Table Length | 1,300 mm (51.2 in) |
| Work Table Width | 480 mm (18.9 in) |
| Wheel Centerline to Table Top | 330 mm (13.0 in) |
| Max Part Diameter | 355 mm (14.0 in) |
| Min Part Diameter | 100 mm (3.9 in) |
| Max Grind Length | 750 mm (29.5 in) centered on pivot |
| Longest Part | 900 mm (35.4 in) bearing end-to-end |
| Max Work Height Above Wheel Centerline | 25 mm (1.0 in) |
| Programmable Lead | 0 to 999 mm (0 to 39.3 in) |
| Programmable Thread Starts | 999 |
| Min Crown Radius | 1.9 m (74.8 in) |
| Max Crown Radius | 999 m (3,278 ft) |
| Form Width Max | 63 mm (2.5 in) |
| Form Depth Max | 25 mm (1.0 in) |
| Wheel Spindle Power | 22 kW (29.5 hp) |
| Wheel Peripheral Speed | 40 m/s (vc is constant) |
| Wheel Spindle Bearings | Hydrostatic |
| Wheel Diameter Spent | 400 mm (15.7 in) |
| Wheel Width | 25 to 80 mm (1.0 to 3.1 in) |
| Wheel Bore | 203.2 mm (8.0 in) |
| Workhead Speed | Up to 200 rpm (50:1 gear box) |
| Rapid Return Speed | Up to 10 m/min (394 ipm) |
| CNC Axes | 7 (includes helix) |
| Linear Axes Positioning | Fanuc Linear Motors (X, Z) |
| Pivot Axis Positioning | Ball Screw and Fanuc Servo (B) |
| Wheel Head Angle Positioning | Lead Screw, Manual or Servo (A) |
| Rotary Axis Positioning | Servo and Gear Box (C) |
| Dresser Axes Positioning | Ball Screws and Fanuc Servos (W, Y) |
| Position Feedback | Heidenhain Scales |
| Linear Ways | Rails and Recirculating Roller Cars |
| Base Construction | Quartzite Epoxy Polymer |
| Tables and Slides Construction | Cast Iron |
| Guards | Stainless Steel |
| Power Requirement | 52 kVA |
| Power Requirements | 200-600 V |
| Machine Weight | 12,000 kg (26,455 lb) |
| Workholding Height | 1.1 m (43.3 in) above the floor |
| Coolant Discharge Height | 0.5 m (19.7 in) above the floor |
| Grind Coolant Min | 100 lpm @ 7 bar (26.4 gpm @ 101.5 psi) |
| Bed Wash Coolant Min | 30 lpm @ 1-2 bar (7.9 gpm @ 14.5-29.0 psi) |
| Coolant Total Flow Min | 130 lpm (34.3 gpm) |
| Diamond Dresser Roll Diameter | 114 to 125 mm (4.5 to 4.9 in) |
| Diamond Dresser Roll Width | Up to 32 mm (1.3 in) |
| Diamond Dresser Roll Bore | 25.4 mm (1.0 in) |
Specifications sourced from drakemfg.com — verified 2026-10-05
Strengths & Limitations
Strengths
- Programmable crown radius from 1.9 m (74.8 in) to 999 m (3,278 ft)
- 22 kW (29.5 hp) wheel spindle on hydrostatic bearings
- Fanuc linear motors on X and Z with Heidenhain scales for position feedback
- Quartzite epoxy polymer base with cast iron tables and slides
- Form up to 63 mm (2.5 in) wide and 25 mm (1.0 in) deep
- CNC controller swings from the front to the side for operator access
Limitations
- Rapid return is up to 10 m/min (394 ipm), slower than the up to 40 m/min (1,575 ipm) of a GS:TE400-750
- Part diameter range is limited to 100 mm (3.9 in) minimum and 355 mm (14.0 in) maximum
- The wheel head angle is positioned by a lead screw that may be manual
- Some rows of Drake's table, including the new wheel diameter, are not printed clearly and need confirming
Best For
Frequently Asked Questions
01
Drake describes its crown grinders as machines that grind drums for tapered roller bearings. The table shows what that involves: a programmable lead of 0 to 999 mm (0 to 39.3 in), a crown radius from 1.9 m (74.8 in) to 999 m (3,278 ft) and a form up to 63 mm (2.5 in) wide.
02
Part diameter runs from 100 mm (3.9 in) to 355 mm (14.0 in). The longest part is 900 mm (35.4 in) bearing end-to-end and the maximum grind length is 750 mm (29.5 in) centered on pivot. The work table is 1,300 mm (51.2 in) long and 480 mm (18.9 in) wide.
03
X and Z by Fanuc linear motors; the pivot axis B by a ball screw and Fanuc servo; the dresser axes W and Y by ball screws and Fanuc servos; the rotary axis C by a servo and gear box. Feedback is from Heidenhain scales, and the ways are rails with recirculating roller cars.
04
The wheel is 25 to 80 mm (1.0 to 3.1 in) wide on a 203.2 mm (8.0 in) bore, driven by a 22 kW (29.5 hp) spindle at a constant peripheral speed. The diamond roll dresser is 114 to 125 mm (4.5 to 4.9 in) in diameter, up to 32 mm (1.3 in) wide, on a 25.4 mm (1.0 in) bore.
05
Weight is 12,000 kg (26,455 lb). Electrical supply is 52 kVA at 200-600 V. Coolant is 100 lpm @ 7 bar (26.4 gpm @ 101.5 psi) for grinding plus 30 lpm @ 1-2 bar (7.9 gpm @ 14.5-29.0 psi) for bed wash, 130 lpm (34.3 gpm) in total, discharged 0.5 m (19.7 in) above the floor.
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