Cylindrical & Centreless Grinder

cylindrical grinder - amt hydraulic cylindrical grinding machine
salient features:

Machine bed

• the machine bed is of one piece, close grained, graded cast iron.
• box structure design, heavily reinforced with ribs, provides high rigidity and stability.

Machine guideways

• machine guide ways of v-flat construction are precisely hand scrapped.
• the work head table as well as grinding wheel head slideways are coated with “turcite-b” linear bearing material which gives stick slip free movements, excellent vibration damping and high repetitive positioning accuracy.
• continuous automatic lubrication system provided for guide ways. Centralized lubrication system is also provided, for efficient and positive lubrication of other moving parts.

Work head

• the machine has a rigid universal work head, which can be swiveled to facilitate taper grinding.
• work head spindle can be locked for grinding between centers or it can be rotated with the driving plate to carry work holding fixtures like collet, face plate or chuck.

Wheel head

• wheel head spindle is made of special alloy steel, specially heart treated, ground and lapped to achieve high dimensional stability and long life.
• spindle runs in precision white metal bush bearings, which give very high accuracy and excellent surface finish to the work piece.

Infeed system

• infeed system comprises of hardened and ground feed screw, which ensures high positioning accuracy and repeatability.
• specially designed nut having backlash adjustment is provided.
• automatic infeed at table reversal.
• hydraulically operated rapid approach / retraction of wheel head slide.

Tailstock

tailstock is of single piece construction for maximum rigidity.
hydraulic actuation of tailstock can be offered as optional.

Automatic grinding cycle (optional)

• single lever operated automatic plunge and traverse grinding cycles.
• cycle operates as work head & coolant on-rapid approach-auto feed-spark off-rapid retraction and infeed hand wheel to starting position-work head & coolant off.
• amount of infeed, infeed rate and spark off time are adjustable.

Dwell

electronic dwelling arrangement provided for effective end grinding operations. Separate timers for left and right ends.


Internal grinding attachement (optional)

• internal grinding attachment with its independent drive motor is hinged on the wheel head and can be quickly lowered into grinding position.
• variety of internal grinding spindles can be offered.

Hydraulics

• hydraulic power pack with solenoid valves is housed outside the machine.
• extremely good thermal stability is achieved in the machine by isolating the hydraulic unit.

Electrical

electrical/electronic controls are contained in separate control cabinet, outside the machine, making it proof and provide easy maintenance.

Optional

stepless variable workspeed, 200 mm centre height in lieu of 150 mm & inprocess guage.

Cylindrical & Center Less Grinder / Cutter Grinder - AMT  Center Less Grinding Machine
Salient Features:

Machine Bed

• The machine bed is of one piece, close grained, graded cast iron.
• Box structure design, heavily reinforced with ribs, provides high rigidity and stability.

Grinding Wheel Pad

• Girding wheel head of sturdy design is fixed to the machine bed.
• Wheel head spindle is made of specially alloy steel, specially heat treated, ground and lapped to achieve high dimensional stability and long life.
• Spindle runs in precision White metal bush bearings, which give every high accuracy and excellent surface finish to the work piece.

Regulating Wheel Head

• Regulating wheel head is mounted on double slide and swivel plate arrangement.
• Spindle specially heat treated, ground and lapped runs in oil immersed precision Anti Friction bearings to give high accuracy and true running.
• D.C. Thyristor drive (Optional – A.C. variable drive) provided to get infinitely variable speed o regulating wheel/work piece. Optimum rpm of work piece can be set to achieve high production and good accuracies.
• Regulating wheel head can be tilted in vertical plane to facilitate through feed girding.

  Infeed System

• Wheel head spindle is made of special alloy steel, specially heart treated, ground and lapped to achieve high dimensional stability and long life.
• Spindle runs in precision White metal bush bearings, which give very high accuracy and excellent surface finish to the work piece.

  Infeed System

• In feed is imparted to the Regulating wheel slide through a hardened and ground feed screw, which ensures high positioning accuracy and repeatability.
• Specially designed nut having backlash adjustment is provided.
• The upper slide moves the regulating wheel in relation to the work rest for easy job set up lower (feed) slide is used for feeding work to the girding wheel.
• Work rest base is firmly screwed to the lower (feed) slide. Work blades can be adjusted in height on work base for different size of components.

Taper Correction

Regulating wheel can be swiveled in horizontal plane by the swivel plate, for fast and accurate taper correction and taper grinding.


Automatic Plunge Grinding Cycle (Optional)

• Single lever operated Automatic Plunge grinding cycle.
• Cycle operates as Rapid approach-auto feed-park off-Rapid retraction and infeed slide moves to starting position.
• Amount of infeed, infeed rate and spark off time are adjustable.

Dressing Unit

• Separate hydraulic dressing units with infinitely variable dressing speeds provided for both Grinding and Regulating wheel is possible with special attachment.
• Profile dressing of Grinding and Regulating wheel is possible with special attachment.

Hydraulic/ Electrical Unit

• Hydraulic power pack unit housed outside the machine for easy maintenance.
• All electrical mounted in a concise panel box. Centralized controls for operator’s convenience.

Lubrication

Centralized lubrication system provided for efficient and positive lubrication of moving parts.


Optional

Form dressing arrangement, Auto loading systems, Hydraulic ejector & Bar feeding arrangement.

Cylindrical & Center less Grinder / Cutter Grinder - Sigma Universal Tool & Cutter Grinders (UTC 250)
Special Features:
 
 
Functional Versatility:

The machine basically designed for sharpening and reconditions wide range of high speed and carbide tipped tools as Side & Face Milling Cutters, Cylindrical cutters, Angle cutters, Convex & Concave cutters, Gear Hobs, End Mills, Shell Mills Reamers, Drills, Taps etc.
 

Construction:

Wheel Head : it is of rigid construction and holds the spindle assembly. It can be flitted horizontally and swiveled vertically full 360 degree, for quick setting of compound angles. Wheel head is mounted on the rigid column, which can be raised/lower up/down. Wheel head also can be adjusted 150mm on cross direction.

Wheel Head Spindle: Alloy steel hardened and ground spindle is mounted on precision pre-loaded radial ball bearings, which are greased packed. The grinding wheels can be mounted on both sides of the spindle and the wheels mount design is such that the spindle can be reversed.

Work Table : This is mounted on the carriage and can be swiveled 45 degree on either side of the column. This table has a smooth and rapid movement longitudinally on the carriage through a roller chain guided and Supported on jibs. Slow movement is through a reduction gearbox. Change over from rapid to slow movement is through a push/pull knob. The precise movement on roller chain enables smooth, sensitive and accurate longitudinal movement even with heavy jobs. The adjustable reversing dogs on the worktable are spring loaded for shockproof reversal of table. Auxiliary Table: This table is mounted on worktable and can be fine adjusted 9 degree on either side. It carries the work head & tail stock, between which jobs are mounted.

Universal Work Head : This can be swiveled full 360 degree in both Horizontal and Vertical planes. It can hold job up to 600mm with the aid if raising blocks. It’s spindle nose has ISO 50/MT 5 tapes and the spindle is mounted to taper roller bearings.