It is primarily intended for use as a jig boring,
machine for Drilling, Boring of jigs and fixtures of Class II
accuracies. The machine is guaranteed to give centre distance
of 0.01 mm and bores to class 7 tolerances. Machine can also perform
light milling jobs.
Features:
• Heavily ribbed close grained cast iron base, column and work
table assembly.
• Motorised coarse movement for spindle
head.
• Spindle made of nickel chrome steel, case hardened,
stabilized and ground to close tolerances, running in high
precision bearings.
• Guaranteed spindle run out of 5 microns
at the spindle nose (ISO 30 / R8)
• Advantage of a turret
head which can be swiveled upto 45o either side.
• Indirect
clamping of X & Y axes movement
Specifications:
Work Table
Work Table Size mm
600 x 400
Table Movement : Longitudinal mm
Cross
450
300
Distance from Spindle to Table: Max/min mm
450/200
Hand Wheel Graduation mm
0.02
X-Y Axis Feeds
Manual
Max Load on Table Kgs
300
Spindle
Spindle Speed rpm
50-4000
Steps
2
Speed range rpm (approx)
(Infinitely Variable)
50-500
500-4000
Quill movement mm
125
Quill Feed mm/rev
0.04, 0.08, 0.16
Coarse movement of Spindle Head mm
250
Spindle Nose
ISO 30/R8
Spindle head movement Motor HP
0.75
Spindle Horse Power HP
3
Machine Weight Kg
1800
Advantages
of GR-25 over RAM Turret Milling Machine (RTM)
All linear movements on hardened and ground guideways with turcite
lining unlike in RTM machine where cast iron guideways are used.
• Smooth and accurate movements.
• Less co-efficient of friction
• Less wear and tear.
The table of 600 x 400 (ideal size for most of the tool rooms) is
fully supported over the entire movement, unlike in RTM machines
where the table overhangs.
• Better accuracies
• Better stability
Infinitely variable spindle drive though a 3HP AC induction Motor.
ISO 30/ R8 spindle taper suitable for milling operations. Rapid
traverse to spindle head through a motor as against the hand operated
knee movement in RTM machine.
• Saves enormous time in bringing the job near the tool
• Quick retraction of tool for inspection
• Reduces operator fatigue – no need to crank the heavy
knee every time.
Machine has been designed for easy conversion to CNC machine unlike
in RTM machine.
• Turcite lining on hardened and ground guideways similar
to a Machining Centre.
• Easy retrofitting either a single axis for vertical movement,
or with two / three axis CNC to covert the machine into a full fledged
CNC machine.
• Initial investment is low – machine can be upgraded
to CNC as and when required.
Machine much sturdier and heavier than RTM machine.
• More rigid and accurate
• Less vibration and noise
• Ergonomically designed to assist the operator
• Both X & Y hand wheels are located on the front of the
machine for better ergonomy.
