MIDAS SERIES
OD Grinder

MIDAS Series OD Grinder
High production multi-spindle grinding

The Weldon Midas series of CNC cylindrical grinders are designed to satisfy high production applications either between centers or in a chucking mode. These machines also provide the flexibility to grind a variety of part configurations with minimal set-up. Rotary and linear axes are sealed from airborne contaminates providing unmatched longevity in carbide and ceramic grinding applications.

Available with either a straight, angular or turret style wheelhead, the Weldon Midas machines can grind outside diameters, shoulders, faces, tapers, and radii, sometimes in a single set-up. Properly equipped, a Weldon Midas is ideally suited for high speed “Peel” grinding with CBN abrasives. Additionally, a programmable “C” axis package can be provided to accommodate non-round grinding applications.

Typical applications include bearing shafts, gear shafts, spindles, hydraulic spools, crankshafts, camshafts, wheel hubs, and large bushings.

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Silicon Carbide (SiC) grinding with the Midas series

Our Midas series models are ideal machines for SiC grinding as they can be configured with many options. They are designed for long-term performance in harsh environments with challenging materials.

The Midas series features a rotating turret, including angled and straight wheels for the boule face and diameter.

Our programmable C-axis option allows us to grind the primary and secondary location flats based on the X-rayed grain angle of the boule. Also, the onboard Renishaw probe provides angular and dimensional verification. With our Vertical Spindle option, we can create a horizontal notch required in some SiC boule applications.

Throughout our history, Weldon has collaborated closely with our customers in all industries to provide a solution for manufacturing SiC microchips. Contact us today to learn how we can implement SiC grinding into your production practice.

SiC GRINDING CASE STUDIES

Midas Turret Silicon Carbide (SiC) Grinder

Midas 320A Dual Spindle Silicon Carbide (SiC) Grinder

FEATURES

Fanuc model 32i-BT CNC control with color LCD, and servo drives featuring Fanuc AC digital technology.
Shear Damper machine base providing stiffness, vibration control, and thermal stability through the use of shear tubes.
Cross-roller linear way system with recirculating bearings and precision ground rails.
Low inertia break-away coupling, X-axis, for ballscrew protection.
Heavy-duty live spindle workhead with 6″ A2 spindle nose and #5 MT center.
Preloaded, precision ground, double-nutted ballscrew assembly for X axis.
Fanuc linear motor assembly for Z axis.
Automatic lubrication system, monitored by the control, with lube fault protection.
Tailstock, lever operated, spring loaded, with #5 MT center.
Variable speed wheel drive, CNC controlled with dynamic braking.
Full enclosure with manually operated front and side sliding door assemblies.

OPTIONS

24″ swing capacity to accommodate larger diameter workparts.
In-process gage for automatic size control.
Automatic lateral locator, wheelhead mounted, featuring a Renishaw probe.
Acoustic emissions sensor for gap elimination, crash detection, and touch dressing.
Programmable workhead with rotary scale, 475 RPM max. For non-round applications.
Power operated tailstock, 5″ stroke, with smart cylinder feedback.
Electric rotary dressing systems for super abrasive wheels or extended diamond life when processing with standard abrasives.
High pressure grinding wheel cleaner.
Work holding can be addressed with manual and powered jaw chucks, collet chucks, magnetic faceplates, vacuum chucks, expanding arbors, pitch-line chucks, and custom fixtures.
Coolant supply and filtration systems are available to suit any application; magnetic, fabric, cyclonic, pressure, and combination filtration units can be provided.
Fanuc X-axis linear motor for non-round applications.
Automatic machine tending with Fanuc 6-axis robots, or custom alternatives can be factory integrated on a turnkey basis.

CASE STUDIES

Midas Automated Pinion Gear Shaft OD Grinder

Midas Dual Spindle SiC OD Flat and Face Grinder

Midas Turret Silicon Carbide Flat, Face and Notch Grinder

Midas Swing Dresser Aerospace Bearing Grinder

Midas Saw Wheel Grinder for the Meat Industry

Midas S2 OD Axle Shaft Grinder

Midas Turret Automated EV Shaft Grinding Cell

Midas OD Bearing Roller Peel Grinder

Midas Automated Worm and Rack Peel Grinder

Midas Pinion Shaft Grinder with Automated Gantry Loader

Capacity

Maximum work swing: 16″
Maximum distance between centers: 25″
Worktable travel: 43″
Maximum workpiece weight, between centers: 300 lbs.

Workhead (Live Spindle)

Bearings: Precision angular contact
Spindle nose (ASME standard): 6″ A2
Center taper: #5 Morse
Through-hole diameter: 1.0625″
Speed (Infinitely Variable): 0-900 RPM
Maximum runout: 0.000050″
Motor, Fanuc AC servo drive: 5.0 HP

Wheelhead

Angular contact ball bearings which allow lateral loading while contouring with wheel edge

Motor (S-2, A-2): 20 hp, T.E.F.C.
Motor (S-3, A-3): 25 hp, T.E.F.C.
Speed (Infinitely Variable): 8,500 SFPM (nominal)
Angle of wheelhead (factory set): 0° or 30°
Travel of wheel slide: 15.25″

Tailstock

Center taper: #5 Morse
Quill retraction (manual lever): 1.5″

Table Drives

Fanuc AC digital servo drives: 1.9 HP
X-axis Table Drive: Precision ground preloaded ballscrews
Z-axis Table Drive: Fanuc linear motor
Way construction: Hardened and ground rails, cross-roller type
Bearings, preload: Cross-roller, recirculating

Grinding Wheel

Maximum OD Wheel diameter (S-2, A-2): 20″
Maximum OD Wheel diameter (S-3, A-3): 24″
Maximum wheel width (S-2, A-2): 4.0″
Maximum wheel width (S-3, A-3): 5.0″

Worn Wheel Size:

S-2: 12″
S-3: 16″
A-2: 14.5″ (wheel width dependent)
A-3: 19.5″ (wheel width dependent)

Lubrication

Wheel spindle: Permanent grease-packed
Workhead spindle: Permanent grease-packed
Ballscrews: Automatic lube oil
Ways: Automatic lube oil
Safety detect interlock to prevent cycling if low oil level is sensed.
Automatic programmed cycle to lubricate machine at start up.

Electrical Specs

Complete electrical equipment wired in accordance with IEC electrical standards for metalworking machine tools
Standard voltage: 480 VAC, 3-phase, 60 Hertz
Note: Any other voltage must be referred to factory for price and delivery.

Pneumatics

Air moisture: 70° F. dew point maximum
Air pressure: 80 PSI
Air volume: 5 SCFM
Note: System requires a filtered and dry air source

Coolant System

Machine is set up to pump coolant out to an optional coolant filter or tank system. All necessary piping and solenoids for coolant control from the machine control are provided.

Machine Dimensions and Construction

Width: 130″
Depth: 91″
Height: 93″
Centerline workpiece, height from floor (S-2, A-2): 43″
Centerline workpiece, height from floor (S-3, A-3): 44″
Weight, Nominal (S-2, A-2): 19,800 lbs.
Weight, Nominal (S-3, A-3): 20,100 lbs.
Construction: Welded steel Shear Damper™
Foundation: 6″ reinforced concrete floor is recommended
Three-point anti-vibration suspension system requiring no floor attachment

CNC Control Specifications - FANUC 32i-BT

Manual pulse generator
Full linear and circular contouring and positioning capabilities
FANUC and AC digital servo systems
Direct RPM programming or constant surface feet per minute
Built-in diagnostics
10.4″ high-resolution color LCD
Macro Subroutines
Automatic recognition of EIA or ISO coding
Absolute / incremental programming software over travel checking
RS 232 / Ethernet
memory card interface / USB

Turret Option Specs

Indexer positioning increment (servo controlled): 1.0 degree
Rotational capability: 270 degrees
Indexing accuracy: +/- 1.5 Arc Second
Repetitive accuracy: +/- 0.3 Arc Second
Centerline workpiece, height from floor: 43″ with OEM platform
Weight, Nominal: 21,600 lbs.

Position #1 (Straight approach wheel spindle assembly)

Integral spindle motor: 31.5 HP (23.5 kW)
Maximum wheel diameter: 20”
Maximum wheel width: 4
Worn wheel size: 13”

Position #2 (Angular approach wheel spindle assembly)

Integral spindle motor: 31.5 HP (23.5 kW)
Maximum wheel diameter: 20”
Maximum wheel width: 4
Worn wheel size: 15” at 4” wheel width, 13” at 2” wheel width

Internal wheel spindle assembly

Spindle diameter: 4.725“ (120mm)
Spindle speed and power rating: Application dependant

MIDAS LEGACY SERIES MODELS

120S Straight Wheelhead | 120A Angular Wheelhead
26″ Work Table Travel

16″ Swing

12″ Length

20″ Wheel

124S Straight Wheelhead | 124A Angular Wheelhead
26″ Work Table Travel

16″ Swing

12″ Length

24″ Wheel

320S Straight Wheelhead | 320A Angular Wheelhead
32″ Work Table Travel

16″ Swing

32″ Length

20″ Wheel

324S Straight Wheelhead | 324A Angular Wheelhead
32″ Work Table Travel

16″ Swing

32″ Length

24″ Wheel

MIDAS SERIES OD Grinder