Ganesh GEN TURN 78-TTMY
Image: expandmachinery.com, Ganesh
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
Max Turn Length
max turning diameter
center distance
How much does the Ganesh GEN TURN 78-TTMY cost?
Price estimate
We do not have a price for the Ganesh GEN TURN 78-TTMY 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
Twin 16-tool turrets, twin 4,000 rpm spindles and 78 mm (3 in) of bar capacity: the GEN TURN 78-TTMY is the production version of Expand Machinery's large turning center. With a turret for each spindle, the front of one part and the back of the previous one are machined at the same time, which is the reason to choose it over the single-turret GEN TURN 78-MSY.
The second turret takes away envelope. Maximum turning diameter is 7.48 in (190 mm), with 6.7 in (170 mm) as the standard figure, and turning length is 15.75 in (400 mm). Z1 and Z2 each travel 17.32 in (440 mm). X1 travels 5.9 in (150 mm) and X2 9.05 in (230 mm), both with glass scale feedback. The maker singles that feature out, and with reason: X-axis error shows up directly in part diameter.
Spindle power is 30 HP peak and 20 HP on the 30 min rating for the main spindle, 20 HP peak and 15 HP for the sub-spindle. The turrets take BMT-65 tooling and drive live tools at 6,000 rpm with 7 HP and 14.75 ft-lb (20 Nm). Across the two turrets there are 32 stations, any of which can be an ID, OD or live position, and adjacent tools change in 0.2 seconds. Y travel is 3.93 in, ±1.968 in (±50 mm) off centerline.
This is a large machine: 165 x 88 x 84 in including the chip conveyor, 22,751 lb (10,320 kg), and a supply of 49.5 kVA at 130 amps. An 8 in chuck with a 68 mm bore is listed as optional, so workholding is something to settle in the quote. The B axis travels 25.59 in (650 mm) at 1,573 ipm (40 m/min).
Full Specifications
| Parameter | Value |
|---|---|
| Max Turning Diameter | 7.48 in (190 mm) maximum, 6.7 in (170 mm) standard |
| Max Turning Length | 15.75 in (400 mm) |
| Center Distance | 36.22 in (920 mm) between centers |
| Bar Capacity | 78 mm (3 in) |
| Spindle Nose | A2-6 |
| Chuck Size | 8 in with 68 mm bore (optional) |
| Spindle Center Height | 46.45 in (1,180 mm) |
| Max Spindle Speed | 4,000 rpm (60 - 4,000 rpm, integral spindle) |
| Spindle Motor Power | 30 HP peak, 20 HP (30 min duty rating) |
| Sub Spindle Power | 20 HP peak, 15 HP (30 min duty rating) |
| Turret Stations | 32 across the twin turrets (any combination of 32 ID, OD or live tool stations) |
| Turret Index Time | 0.2 seconds adjacent tool / 1.2 seconds 180° index, high-speed servo indexing |
| Live Tool Power | 7 HP |
| Live Tool Speed | 6,000 rpm |
| Live Tool Torque | 14.75 ft-lb (20 Nm) |
| Tool Size | 25 mm square and round tools, ER-32 collets |
| Turret Tooling | BMT-65 base mount tooling |
| Y Axis Travel | 3.93 in, ±1.968 in (±50 mm) off centerline |
| Rapid Traverse Y | 236 ipm (6 m/min) |
| C Axis | 360,000 radial positions with full contouring capability |
| B Axis Travel | 25.59 in (650 mm) |
| B Axis Rapid Traverse | 1,573 ipm (40 m/min) |
| Distance Between Spindles | 36 in (914 mm) |
| X Axis Travel | X1 5.9 in (150 mm), X2 9.05 in (230 mm), with glass scale feedback |
| Z Axis Travel | Z1 17.32 in (440 mm), Z2 17.32 in (440 mm) |
| Rapid Traverse Rate | X1, X2 630 ipm (16 m/min); Z1, Z2 1,573 ipm (40 m/min) |
| Hydraulic System | 10.5 gallons (40 liters) with 3 HP (2.2 kW) pump motor |
| Machine Weight | 22,751 lb (10,320 kg) |
| Power Requirement | 49.5 kVA, 220 VAC ±5%, 3-phase, 60 Hz, 130 amps |
| Air Requirement | 85 psi at 8 cfm |
| Machine Dimensions | 165 x 88 x 84 in (W x D x H), includes chip conveyor |
Specifications sourced from expandmachinery.com — verified 2026-10-04
Strengths & Limitations
Strengths
- Twin BMT-65 turrets with 32 stations in total, any of them ID, OD or live
- Simultaneous machining on main and sub-spindle
- Glass scale feedback on the X1 and X2 axes
- Live tools at 6,000 rpm with 7 HP and 14.75 ft-lb (20 Nm)
- 78 mm (3 in) bar capacity with 30 HP peak on the main spindle
Limitations
- Turning length is 15.75 in (400 mm), shorter than the 24.8 in (630 mm) of the GEN TURN 78-MSY
- Maximum turning diameter is 7.48 in (190 mm)
- The 8 in chuck with 68 mm bore is optional
- Large and heavy: 165 x 88 x 84 in and 22,751 lb (10,320 kg)
Best For
Frequently Asked Questions
01
Two 16-tool turrets give 32 stations, and Expand Machinery states that any combination of 32 ID, OD or live tool stations is possible and that each station can mount multiple tools. Tooling is BMT-65 base mount with 25 mm square and round tools and ER-32 collets.
02
The spindles are integral units running 60 - 4,000 rpm on A2-6 noses. The main spindle motor is 30 HP peak and 20 HP on the 30 min duty rating; the sub-spindle motor is 20 HP peak and 15 HP. Spindle center height is 46.45 in (1,180 mm).
03
Glass scales measure the slide position directly instead of inferring it from the ballscrew, so thermal growth of the screw does not turn into diameter error. On this machine X1 travels 5.9 in (150 mm) and X2 9.05 in (230 mm), both with glass scale feedback.
04
Y travel is 3.93 in, or ±1.968 in (±50 mm) off centerline, with a rapid of 236 ipm (6 m/min). The B axis travels 25.59 in (650 mm) at 1,573 ipm (40 m/min), and the distance between spindles is 36 in (914 mm).
05
The machine is 165 in wide, 88 in deep and 84 in high including the chip conveyor and weighs 22,751 lb (10,320 kg). Electrical supply is 49.5 kVA at 220 VAC ±5%, 3-phase, 60 Hz, 130 amps, and air is 85 psi at 8 cfm.
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