Rhino Robotics Ltd., Miamitown, OH - 513-353-9772



General information: The RM/6 is a larger mill, which gives the students the full favor of what a CNC milling machine is capable of doing and how it is controlled and programmed to make real parts in real time. The R8 spindle allows the mill to hold real tools. A quick change tooling system gives the speed needed to do real work. The large milling head is rigid enough for real cuts.

Vertical spindle design: The vertical spindle design of the RM/6 ensures that the mill will operate just like a full sized CNC vertical milling machine and that the circular interpolation commands will work exactly as they do on full sized shop floor machines Since circular interpolation commands are the hardest of the commands to master, it is essential that the mill works exactly as the shop floor models. This will prevent expensive crashes on the shop floor in the future.

Spindle: The milling spindle supports the world standard R8 taper. This is an important feature because it allows easily available industrial tooling to be used in the RM/6 mill. Almost all standard R8 tooling can be used on the RM/6. The spindle is housed in a one piece stress relieved and heat treated aluminum casting. This is important on a smaller mill because a smaller machine tends to be less rigid than its real world counterpart. Heavy, lubricated for life, sealed bearings at either end of the spindle provide for long life and easy care. The spindle head is counterbalanced to provide faster operation and more accurate cutting.

The spindle speed and direction are programmable and are controlled from the computer. The spindle has its own encoder to provide speed feedback. Full reverse operation is implemented as is needed for special tooling and for certain mold making operations.

Ways: The RM/6 uses hardened, ground and polished ways on all three axes. Double, double length ball bushings provide bearing for the head, carriage and cross slide. The ways are set for a wide stance to provide the extreme rigidity that is needed in a milling machine. Way wipers are provided on all ball bearings. Bellows covers are provided for the “Y” and “Z” axes that are exposed. The “X” axis is protected by the table.

Ball screws: Precision ball screws and recirculating zero back lash ball nuts are provided for all three axes.

Axis limit switches: Both software and hardware limit switches are provided on both axes. Axis movement can also be limited from the program with “G” codes. The hardware switches are optical flags for years of long, trouble free service. There are no moving parts.

Table: The cast iron table is 21 inches (533.4 mm) long by 7 inches (177.8 mm) wide and 1.25 inches (31.75 mm) thick. It is designed to provide a large rigid work surface. It has three mounting slots. All primary surfaces are ground.

Carriage: The carriage is machined from solid cast iron to provide an accurate and rigid mounting for the milling table. Double, double length ball bushings are provided for both the “X” and “Y” axes. All primary surfaces are ground.


Axis drives, feeds and speeds: The Rhino RM/6 is a very fast mill. The “Z” axis drive for the RM/6 is a servo motor. This provides speed up to 200 in/min. This can be limited by a programmable parameter to allow for the speed most comfortable/safe for the user. This fast “Z” axis allows for very rapid tool changes with the quick change tooling. This is a major bottleneck in other designs.

The “X” and “Y” axes use stepper motor drives that allow travel rates up to 70 in/min. This is accomplished with sophisticated drive amplifiers and dedicated microprocessors for each axis. Special high speed ramping algorithms developed by Rhino are used to achieve these high speeds.

All axes use rugged cogged belt drives to provide power and to smooth out the cogging effects of the stepper motors. This provides both power and smoothness on a stepper motor design to give you the best of both worlds.

PC control: The mill can be controlled from any DOS compatible computer. No special card is required in the computer. The mill runs from computer serial port. This means that the mill can be run from any computer without having to install a card in the computer.

Stand alone operation: Once the program has been tested and proved, it can be downloaded to the mill and the control computer can be disconnected. The mill is now controlled form the front panel of the mill. This feature allows you to use the mill control computer to run some other part of your CIM/FMS work cell.

Serviceability: The mill is designed to be easy to service, maintain and repair because the learning environment is an environment where mistakes are likely to be made. The mill is designed to be crash tolerant.

Software: Rhino provides a comprehensive software package for the operating system of the RM/6. This software allows complete control of the RM/6 as well as providing a large integrated help system, all built into the same program.

The mill/computer system provides error messages and alerts to the user, as needed, as the system is operated and these conditions occur. All messages and alerts can be further interpreted by the help system.

Programs are written and modified on a full screen editor whose operation is very like the operation of a text editor. All insert, delete, copy and move type instructions are implemented. The editor provides syntax checking on each line. If an error is found, the user is directed to the help system to correct the error. The line can not be left without correcting the error. The mill will not run any program that has errors. This provides a safety factor for both the  user and the system.

A comprehensive full screen control panel allows full control of the mill from the computer. Full control of the spindle, the three axes and the tool changer is provided. The mouse and keyboard both provide full control. The screen implements the type of controls that would be found on a full sized mill in manual mode of operation. This supplements but does not replace the MDI mode (immediate mode).

Use with Robot: All the hardware and software needed to implement the operation of the mill with a robot or other feeding device is provided on the RM/6. Six separate "M" codes provide full support for this function. Screw terminals are provided at the back of the mill.

Use with PLC: All the hardware and software needed to implement the operation of the mill with a Programmable Logic Controller (PLC)  is provided on the RM/6. Six separate "M" codes provide full support for this function. Screw terminals are provided at the back of the mill.

User 1 and User 2: The RM/6 provides two individually programmable Double Pole Double Throw (DPDT) relays for use by the mill user. These relays are completely isolated from the computer and may be used to send signals to connected equipment and to control auxiliary equipment that the users is using with the mill. Screw terminals are provided at the back of the mill.

Additional Information -

RM/6 Overview
RM/6 Specifications
RM/5 and RM/6 Comparison
RM/6 (FG6117) Standard Package Features


Rhino Robotics Ltd. Home Page


5928 State Route 128
Miamitown, OH 45041-0230
Telephone: 513-353-9772
Fax: 513-353-4040