NEW ACRA 2690 SCH

2025 ACRA MODEL SCH 2690 Engine Lathe, 26" Swing, 90" Between Centers, 4" Hp;e Thru
The ACRA SCH-2690 (often listed as ACH-2690 or 2600 Series) is a heavy-duty, precision gap-bed engine lathe designed for large-capacity turning operations.
Features:

All castings are properly stabilized and stress relieved
Bedways are hardened & ground to min. HRC48-55
Extremely low noise level
Foot brake pedal provided
Wider bedway which absorbs vibration
Y-△ type spindle motor equipped for smooth start and operation
Oil distributor may be adjusted to lubricate bedways, cross slide, or both
Automatic and manual forced lubrication pump offer oil to bedways and cross slide

Capacity & Dimensions
Swing Over Bed: \(26"\)
Swing Over Cross Slide: \(17\frac{3}{8}"\)
Swing In Gap: \(31\frac{3}{8}" - 35\frac{3}{8}"\) (depending on the specific build)
Distance Between Centers: \(90"\)
Bed Width: \(15\frac{3}{4}"\)
Headstock & Spindle
Spindle Nose: D1-11
Spindle Bore: \(4\frac{1}{16}"\) or \(4\frac{1}{8}"\)
Spindle Taper: MT No. 7
Spindle Speeds: 12 steps (typically ranging from 13 to \(1,200\) RPM)
Carriage,
Tailstock & Power
Carriage: Features a \(15\frac{3}{4}"\) cross slide and \(9\frac{1}{2}"\) compound travel with wide threading ranges (2–72 TPI, 0.2–14 mm).
Tailstock: Equipped with a \(2.935" - 2\frac{15}{16}"\) diameter quill, \(7"\) travel, and MT No. 5 taper.
Motor: Driven by a 15 HP, 3-phase motor.

Standard Accessories:

D1-11 15" 3-jaw chuck
Spindle center sleeve MT.7 x MT.5
Dead center MT.5 with carbide tip
Operation manual & parts lists
Level pads 6~10 pcs
Rapid travel standard on 120" & 160" Lathes, Optional Add-On for 60" & 90" Lathes
Coolant system
Chuck guard
Full length splash guard
Tool set & box
Halogen lamp
10" steady rest (40 ~ 254 mm)

Optional Accessories:
Face plate 20"
Digital read out system
Electrical system for CE
Tool post safety guard
4-jaw independent 16" / 18" chuck
Drill chuck & arbor
Rotating center MT.5
Taper turning attachment
16" steady rest (190 ~ 405 mm)
Follow rest (20 ~ 184 mm) with bronze tip
Quick change tool post
Protect cover on leadscrew for CE

Universal Gearbox:

The universal type gear box provides a wide range of inch & metric threads without changing any gear for increasing convenience
Gears are hardened
Oil bath lubrication in gear box

Apron:

A manual & automatic lubrication system equipped to keep the sliding ways and bedways lubricated
Choice of right or left hand wheel
An overload protection device equipped to avoid machine damage
A limit switch equipped to protect the power feed motor
Rugged Headstock:

Forced lubrication to all running points
Head housing features outstanding vibration dampening and deformation free performance
Rugged head construction gives extra rigidity and heavy cutting
All gears and shaft are hardened and precision ground
An O-ring around the headstock to avoid oil leakage, and offer more convenience to open / close the cover

Rugged Tailstock:

Tailstock quill is graduated in inch / metric scales
A tang slot for positive drive of tool equipped
Two-step tailstock provides smooth operation
3 V Sliding Ways:

The 3V type bed rail structure is more stable than the general bed rail structure, more suitable for heavy cutting, has high precision, and can extend the service life of the machine
The bed has undergone hardened and quenching treatment and precision grinding to ensure optimal hardness, straightness and smoothness
Frontward Chip Tray:

To save space when setting up the lathe machine
Easier to clean up the chip after operation
Dual Braking System:

A mechanical brake system plus an electrical braking system to make sure the operator could stop the spindle in the shortest time