PCNC 770 Series 3 CNC Mill

Technical Overview

The PCNC 770 Series 3 was created to address a specific need for engineers, R&D professionals, educators, hobbyists, and specialty manufacturers that wasn't being met by existing benchtop CNC milling machine designs. While most benchtop CNC mills meet the need for a milling machine that is portable and easy to install in a small office or workshop, none have the power and precision necessary to work with real world materials or real world designs. With the PCNC 770, our engineers set out from the beginning to create a new type of benchtop CNC mill – a design that combined all the attractive features of a benchtop CNC mill with the performance of a small Vertical Machine Center (VMC).

PCNC 770 CNC Mill Design Considerations:

• Small Size without the Compromise - a real machine tool without the typical compromises of benchtop CNC mills. The PCNC 770 can be moved into nearly any space and requires only basic 120VAC 50/60 Hz line voltage to operate, but has the ability to cut much more than plastic, foam board, and thin aluminum.
• Affordable Precision – smaller doesn't mean less capable. The PCNC 770 uses the same motion systems as our bigger PCNC 1100 CNC Mill. A stout cast iron frame combined with direct-drive antibacklash ballscrews and a precision microstepping drive system that offers superior performance compared to typical benchtop CNC systems built of extruded aluminum frame components.
• Adaptable Spindle– a responsive 1.0HP, 10000 RPM R8 spindle offers the speed needed for small endmill finishing while still provides enough torque to cut the materials you use the most: aluminum, plastic, steel, titanium, and even stainless – all without restricting tooling choices to what fits in small diameter collets typical of other benchtop CNC milling systems.
• Expandable, Modular Design – the ability to add accessories like 4th Axis, Automatic Tool Changer, Power Draw Bar as needed gives the PCNC 770 much more capability than any other Benchtop CNC Mill.
• Low cost of Ownership – most benchtop CNC mills are more style than substance, with designs that are expensive and difficult to repair without an experienced technician. PCNC 770 is an easy-to-maintain and affordable to run benchtop CNC that's at home in both R&D labs and small manufacturing shops.

New Features: PCNC 770 Series 3 CNC Mill

For the PCNC 770 Series 3, we introduced a completely revamped axis motion system that combines high performance polyphase motors with state-of-the-art Leadshine® microstepping drive electronics. As a result, the PCNC 770 Series 3 CNC Mill provides increased torque at cutting speeds, faster motion maximums, and ultra-quiet performance over previous generations of Tormach CNC Milling machines.

Polyphase Motion Provides:

• Increased maximum motion speeds
• Significant Improved Torque at Cutting Speeds
• Lower Noise
• Improved Accuracy
• Improved Linearity
• Reduced Vibration

For more information about the benefits of polyphase motion, refer to our Series 3 Design Analysis Whitepaper

Additional New Feature: PCNC 770 Series 3 CNC Mill

New Paint Formulation:

PCNC 770 personal CNC milling machines are now painted with a long lasting 2-part acrylic alkyd-amino resin system that adheres tightly and is resistant to most cutting fluids and oils.

Technical Specifications: PCNC 770 Series 3 CNC Mill

Key Dimensions/Weight
Table Size:	26" x 8"
Table Slots:	3 Slots 5/8"
Travel:	14" x 7.5" x 13.25" (X,Y,Z)
Spindle Nose to Table:	14.8" maximum
Spindle Center to Column:	8 5/8"
Spindle Nose Diameter:	3 3/8"
Shipping Dimensions:	42" x 45" x 49"
Weight:	662 lbs net / 800 lbs gross (excludes stand)
Max Workpiece :	400 lbs Maximum

Power
Power Requirements:	115 VAC 50/60 Hz single phase (primary). 20A breaker recommended

Iron
Frame and Table	Cast iron frame and table, with hand scraped hydrodynamic ways and tapered adjustment gibs
Way Surfaces	Low friction PTFE-filled acetyl bonded sliding surface. Similar to Rulon® and Turcite®

Spindle
Spindle Taper:	R8
Spindle Construction:	Dynamically balanced cartridge with spindle lock
Spindle Drive:	Emerson Control Techniques™ Sensorless Vector Technology 750W continuous, 1300W peak  - Learn More
Spindle Power:	1.0 hp Brushless AC 3-phase Induction Motor, Vacuum Pressure Impregnated (VPI)Windings
Spindle Speed:	175 to 10000 RPM
Transmission:	Gates Polyflex® V-Belt Drive, 2 ratios

Motion
Feed Rate:	135 IPM (X,Y) 110 IPM (Z)
Axis Drives:	High Performance Polyphase Stepper Motors with Leadshine® Microstepping Drivers   - Learn More
Ballscrews	Ground P4 Ball Screw with anti-backlash double ball nut Incremental Error: <.0006"/ft Cumulative Error: <.0008" at 35"

Control
Operator Console	Complete spindle control, plus Spindle Lock-Out Key Coolant On/Off/Auto
Controller: (sold separately)	PC  – MachOS (recommended) or Ubuntu Linux; Windows XP, Vista, Windows 7 (compatible) Mach3 license included with PCNC 770 CNC Mill purchase
Additional Control Features	Integrated DIN accessory port for integrating optional touch probe or tool setter. Prewired for optional 4th–axis Preconfigured for Electronic handwheel Optional Remote E-Stop