Geminis Mill-Turn / Multi-Tasking Machines

Geminis GM7i

Specs verified 2026-10-03 · geminislathes.com Updated 2026-10-03

Image: geminislathes.com, Geminis

Key Specifications

headstock type

Twin Drive Headstock

column

Multiprocess column

bed type

Monoblock bench

device change

Automatic device storage and switching

tool changer

ATC automatic tool change

max workpiece weight

30,000 kg (66,138 lb)

How much does the Geminis GM7i cost?

Price estimate

Uncertain

We do not have a price for the Geminis GM7i 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 Geminis GM7i is the middle size of the GM multi-tasking lathes, rated for a 30,000 kg (66,138 lb) workpiece with a maximum turning diameter of 1,600 / 1,800 mm (63.0 / 70.9 in).

Compared with the GM5i, the step up is more about mass than diameter. The GM5i lists 15,000 kg (33,069 lb) and 1,300 / 1,500 mm (51.2 / 59.1 in), so the GM7i carries twice the weight for a moderately larger turning diameter. A dense, heavy shaft that is not especially wide is the kind of part that pushes a buyer from one to the other.

Above it, the GM9i lists 2,000 / 2,500 mm (78.7 / 98.4 in) and a weight range of 25,000 - 80,000 kg (55,115 - 176,367 lb). That range opens below the GM7i's 30,000 kg, which means the two overlap on weight and separate on diameter.

The layout rows match the family: Twin Drive Headstock, Monoblock bench, a Multiprocess column served by ATC automatic tool change, and automatic device storage and switching. Geminis lists the length range as 1 - 24 m (39.4 - 944.9 in). The table carries no spindle or magazine figures.

Full Specifications

Parameter	Value
Headstock Type	Twin Drive Headstock
Column	Multiprocess column
Bed Type	Monoblock bench
Device Change	Automatic device storage and switching
Tool Changer	ATC automatic tool change
Max Workpiece Weight	30,000 kg (66,138 lb)
Max Turning Diameter	1,600 / 1,800 mm (63.0 / 70.9 in)
Length Range	1 - 24 m (39.4 - 944.9 in)

Specifications sourced from geminislathes.com — verified 2026-10-03

Strengths & Limitations

Strengths

30,000 kg (66,138 lb) workpiece rating, twice the 15,000 kg (33,069 lb) of the GM5i
Maximum turning diameter of 1,600 / 1,800 mm (63.0 / 70.9 in)
ATC automatic tool change on a Multiprocess column, with automatic device storage and switching
Twin Drive Headstock mounted on a Monoblock bench

Limitations

Parts wider than 1,800 mm (70.9 in) need the GM9i, which lists 2,000 / 2,500 mm (78.7 / 98.4 in)
Two turning diameters are listed without the table naming the variant each belongs to
Headstock power and torque are not listed, which matters on a machine expected to turn 30,000 kg (66,138 lb)

Best For

Heavy shafts and rotors up to 30,000 kg (66,138 lb) finished in one setup Diameters up to 1,600 / 1,800 mm (63.0 / 70.9 in) Parts too heavy for the GM5i but within its range of diameters Long components inside the 1 - 24 m (39.4 - 944.9 in) length range

Frequently Asked Questions

01 GM7i or GM5i: which one do I need?

Check weight first. The GM5i is rated for 15,000 kg (33,069 lb) and 1,300 / 1,500 mm (51.2 / 59.1 in) of turning diameter. The GM7i takes 30,000 kg (66,138 lb) and 1,600 / 1,800 mm (63.0 / 70.9 in). Both list the same headstock, column and tool change rows, so the decision rests on the part.

02 Does the GM7i overlap with the GM9i?

On weight, yes. The GM9i lists 25,000 - 80,000 kg (55,115 - 176,367 lb), so a 30,000 kg (66,138 lb) part fits either machine. On diameter they do not overlap: the GM7i ends at 1,800 mm (70.9 in) and the GM9i lists 2,000 / 2,500 mm (78.7 / 98.4 in).

03 How many tools does the GM7i hold?

The table does not say. It lists "ATC automatic tool change" and "Automatic device storage and switching" with no magazine capacity or tool size limits. Ask Geminis for the number of pockets and the maximum tool dimensions when requesting a quotation.