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CNC SUPRA® Vertical Knee Mill Retrofit Kit

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$5,148.00

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Enhance Your Existing CNC Machine with Our CNC SUPRA Vertical Knee Mill Retrofit Kit!

***Test out the Master MX to run your Supra Mill and be sure to check out the video here:  Master MX Intro Video

  • Improve the productivity of your milling machine with automation technology!
  • Easy Turn-Key Operation
  • No Fancy Setups Required
  • Easy to Use for Both Beginner and Experienced Machinists

Retrofit your own Vertical Knee Mill Bridgeport Copy-Type 9×42″ or 9×49″ Table with 12″ Knee with our complete, three axis CNC Kit for the low price of $5,148. Need other options? Check out our complete CNC SUPRA Mill.


Have a larger forehead on the J-Head? The motor can be positioned upside-down as well.

Your CNC Vertical Knee Mill will take about eight hours to complete.

Your Three Axis Kit comes complete with:

  • Powerful X, Y, & Z micro-stepper motors. The minimum possible motion is .0002″ with a minimum feed of 0.5″ per minute.
  • The maximum is 100″ per minute. X and Y are size 34 pre-wired with 1500 in/oz. of torque and the Z is size 34 pre-wired with 1200 in/oz. of torque.
  • A micro-stepper motor control unit with built-in USB interface
  • X, Y, Z Zero Backlash Ball Screws with pre-loaded ball nuts to eliminate play on the table, block, and quill travels to provide precision machining.
  • Home/Limit Switches for all extreme ends of X, Y, & Z travel allowing you to confidently test your program without having to worry about an axis traveling to its end, causing machine damage.
  • Our MX Operating software is compatible with Windows 10 or 11 – 64 bit systems
  • The control unit plugs in by standard USB port, no additional hardware or computer conversion required.

Click here to view our full specs on the CNC SUPRA Master Operating Software

CNC Masters understands that many older NC machines are among the best for reliability and durability, but the controlling systems are outdated or simply impossible to maintain and repair. As such, outdated machines are often left in a corner and forgotten. With CNC Masters, an older machine can be revitalized, bringing added productivity and efficiency to any shop. By installing our CNC Vertical Knee Mill Retrofit Kit, any shop can breathe new life into old machines.

Installing our retrofit kits into an older machine improves productivity and efficiency. CNC technology allows machinists to fabricate parts with little interaction with the machine itself, and CNC machines can be programmed to create large production runs automatically. Since the operation of CNC machines is incredibly easy to learn, novices can create complex designs using CAD by loading the design into a CAM with one single click.

While our CNC conversion kits are designed to be installed easily, even by just one person, performing modifications on any CNC machine can be intimidating. Our staff consists purely of trained professionals whose main goal is to help our customers.  We will walk you through any troubleshooting, repairs, or provide instruction as you convert your machine.  Contact us for any questions regarding your CNC SUPRA Vertical Knee Mill Retrofit Kit.

Customer Testimonial:

“For those of you out there who are considering a conversion of any Bridgeport or Bridgeport clone knee mill, please allow me to advise you to give serious consideration to the CNC Masters kit. It is a complete kit, and is extremely well-designed with great consideration given to make it easy to assemble with a minimum of work to the mill itself. Working by myself and following the instructions, I had no problems of any kind with respect to alignment or any other issues.

In running the mill, repeatability is as advertised. As is accuracy. My mill is equipped with X and Y DRO, and the coordinates called for on the computer are matched by the DRO indications within 2 to 4 ten-thousandths EVERY time! Measurements of repeat runs are even better than that!

I searched a long time for a kit, and given CNC Masters’ design and manufacturing quality, and including ease of conversion, I could not find anything that even came close to matching it. Neither could I find anything close to this price.

Lastly, CNC Masters has been one of the most accommodating companies I have ever dealt with. All things considered, this was one of the best decisions I have made, and a huge step in having more capability.”

— M. Morris, Marysville, CA

Introducing the CNC SUPRA Vertical Knee Mill Retrofit Kit

The CNC Vertical Knee Mill Retrofit Kit was created with the hands-on operator in mind. Now you can upgrade your current operation to modern specifications while avoiding excessive improvement costs. One immediate benefit is that you can better understand the operation of your equipment and keep costs down to a minimum.

We also recognize that even the do-it-yourselfer is not expected to know all the ins and outs of building a functional and reliable CNC vertical knee mill, which is why we have a team of professionals just a phone call away who are ready to assist you through any difficult stage of putting it together.

Most importantly, the CNC SUPRA Vertical Knee Mill Retrofit Kit helps you save both time and money. When you have the necessary components to upgrade and improve your existing equipment, it will no longer be obsolete. Recognizing the investment most shop operators make in their existing machines, we are all for maximizing your return on investment by modernizing perfectly good equipment already in use on your premises.

CNC Masters is dedicated to providing the best equipment and kits to our customer base. Rather than encouraging a wholesale upgrade of your expensive equipment through new models, we prefer the practical method of finding ways to bring you up to speed without a significant additional outlay of your hard earned dollars. One way to accomplish this is through the use of the CNC Vertical Knee Mill Retrofit Kit.

Aside from upgrading your equipment with the use of our kits, you can also take it a step further with our selection of CNC mill accessories. Made to complement our conversion kits, the accessories we provide include hand-held remotes, CAD-CAM software to reduce design errors, and engraving attachments. These accessories further improve precision and control over your retrofitted milling machine while saving on time and costs.

Remember that CNC Masters is always standing by ready to give you the assistance you need to keep your production line humming and creating products for your customers. We know the value of satisfying our customers; we also understand the worth of assisting our satisfied clients in retaining their own customer line by ensuring that our equipment meets your operating needs while maximizing production results.

Our pride is in offering you machines and accessories made with the user in mind. Let us provide you with all your machining needs today! If you have any inquiries regarding the CNC SUPRA Vertical Knee Mill Retrofit Kit, feel free to contact us.

CNC SUPRA® Vertical Knee Mill Features

  • Home Reference Sensors on the X, Y, & Z which saves your home/zero position as the first line of your program. This feature allows you to quickly return to the home position on any program without having to manually zero your three axes again
  • Tool Height Compensation with Automatic Quill Retraction for easy R8 collet tool change
  • Tool Radius Offset Compensation
  • Easy to Use Jogging Features and Feed Control
  • Jog-Input Command automatically writes each line of your toolpath as you manually jog each axis by pc mouse, keyboard, or the optional hand held remote control joystick to save as a program for repeat use.
  • Software Power Feed capabilities on X, Y, Z, and W with one click of the pc mouse for exact relative driving distance.
  • Run your tool path from any line on your program
  • 3 Axis or 4 Axis CNC Control Unit which mounts on the back of your mill and drives your system.
  • Master Software with G-CODE file interpreter; works with your Windows 7 or Windows XP Pro
  • Hand-Wheels for each axis. These hand-wheels mount directly behind each motor, giving you manual option for the machining of quick and simple parts that do not require programming.
  • All hardware supplied with easy-to-follow instructions for the conversion of your mill.

Other Great Features that comes with your KIT

  • X & Y Direct Drives--no belts to adjust. This results in smoother operations and ensures accuracy unlike pulley and belt drive methods which can cause the belt to buckle causing inaccurate results. This unique design of direct drive keeps the user without having the need to change the belt or adjust as it wears down.
  • No bulky large motor brackets that house the belts on the X & Y
  • Full 3 Axis coordinated motion control, or hand-operated control
  • Easy-to-follow instructions with pictures to convert your mill
  • Easy mounting of Z Axis bracket ball screw motor assembly to Quill with alignment reference guides for Quill Drive
  • Easy precision alignment setup of the X & Y ball screws to your machine
  • Control Unit mounts on side of your machine and hooks up to your PC
  • Pre-engineered for you when it comes to pitch and resolution. No axis or motor tuning needed at setup. No additional parameters set-up required. Display resolution is 0.0001 micro-stepping travel. Just start using it.
  • Since this is not a complicated servo system, you do not need to tune up anything for optimum performance. Our design uses a micro-stepping system "already" pre-designed for optimum performance.
  • Ready-to-Operate System: As soon as all hardware conversion on your mill is done, install the software on your PC, plug the Control Unit to your PC, turn it on, and you are ready to program your parts to machine!
  • Runs files from popular CAD-CAM softwares that produce standard G-Codes such as Mastercam, Surfcam, etc to machine and engrave intricate and detailed parts
  • Load DXF files from graphic programs such as CorelDRAW into CAM softwares to machine or engrave detailed parts from scanned images
  • Easily build a file of commands to machine simple parts without the need to learn or use a CAD-CAM program
  • Can add hand held remote control, engraving attachment, fourth axis, quick tool change, computer control coolant assembly--providing your machine contains a built in tank from our line of accessories to your newly assembled CNC Mill. The Hand Held Remote Control is an optional accessory which is mounted to your Supra's Z axis with Velcro as shown in the picture above.
  • Easy to learn and operate, especially if you already know how to mill
  • Digital Read Out Display of your X, Y, Z, (and optional W) counters on your computer screen in INCHES or METRIC using your PC mouse, keyboard, or our optional Hand Held Remote Control.
  • Backed up by our CNC MASTERS ONE YEAR WARRANTY.
  • Unlimited "life-long" operational Tech Support step-by-step trouble shooting and walk-through process by email or phone support Monday-Friday PST during normal business hours for as long as your company owns the product.
  • Free Master Software Updates for as long as the control unit hardware supports it.
  • Discounted Prices for Existing Customers of CNC MASTERS
  • Computer Controlled Variable Spindle is an "optional add-on" to your kit if you have a three phase 3 HP Motor. Click here to learn more about the variable spindle computer control.

These signs were made by one our happy customers after he converted his manual mill to CNC using the CNC Supra Retrofit Kit and the fonts from a CAD-CAM.

We provide you with "easy-to-follow" detailed instructions on how to mount the motors directly onto your mill with our easy-to-mount brackets just like in the pictures. The instructions will also show you how to install all the other features that are included in your kit such as your ball screws and Control Unit.

IMPROVE THE PRODUCTIVITY OF YOUR MILLING MACHINE with automation technology! Why spend thousands more on a new CNC Milling Machine if you already own a bridgeport-type vertical knee mill 9x42 or 9x49 table, 12" knee? Put it to use, and design parts with ease using CNC Masters technology!

All components and accessories on the CNC SUPRA Retrofit Kit are individually tested for quality assurance before shipment. The CNC SUPRA Retrofit Kit is backed up by our ONE YEAR LIMITED WARRANTY! Tech Support by email at sales@cncmasters.com or phone (626) 962-9300 is available during normal business hours Monday through Friday, PST. See our warranty for details.

If your mill looks like the model in the thumbnail picture above with a 9x42/49 Table and a 12" Knee, and has Quill Face like in these close-up pictures below or like the BRIDGEPORT SERIES 1 J-HEAD, then the CNC Supra Kit will work for the conversion of your machine!

If the top part of the Head comes forward as in the third picture above, the Z Axis Motor and Bracket can be mounted reversed so it does not cause interference with head of your machine. A simple reversal of the motor wires will allow you to retain the correct pos/neg motion. The top and bottom reference faces can have an un-even surface as shown in the pic above or have a flat surface as well. In approximately 8 hours you should be ready to operate your newly retrofitted milling machine with CNC power!*

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29. Create a Peck Drilling Program in Circular or Rectangular Patterns
Using the Circular or Rectangular Drilling Wizards, you can program the machine to drill an un-limited series of holes along the X and Y planes. Program it to drill straight through to your total depth, use a high-speed pecking cycle, or deep hole pecking cycle. You can program the cut-in depth and return point for a controlled peck drill application to maximize chip clearance.

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20. Change up to 30 tools with compensation, and store your tool offsets for other programs
The MX supports…

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21. Use the optional ATC rack up to 8 tools for milling, drilling, and rigid tapping applications
The CNC Masters Automatic Tool Changer Rack and Tools (US Patent 9,827,640B2) can be added to any CNC Masters Milling Machine built with the rigid tapping encoder option. The tutorial will guide you through the set-up procedure using the ATC tools.

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22. Use the optional Rigid Tapping Wizard without the need for tapping head attachments
When you order your CNC Masters machine, have it built with the optional rigid tapping encoder. You can take any drill cycle program and replace the top line with a tapping code created by the wizard to tap your series of holes up to 1/2” in diameter.

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23. Use the optional Digital Probe to scan the profile and/or pockets of your fun/hobby type designs to write your tool path program and machine out a duplicate of your original design To “surface” scan an object, you can program the probe along the X or Y plane. The stylus will travel over the part starting on the left side front corner of the object and work its way to the end of the part on the right side. Depending on how the stylus moves, it will record linear and interpolated movements along the X, Y, and Z planes directly on the MX Editor.
To “pocket” scan an object containing a closed pocket such as circles or squares, the scan will start from the top front, work its way inside of the pocket, and scan the entire perimeter of the pocket.
Under the Setup of the MX software you will find the Probe Tab which will allow you to calibrate and program your probe. Your “Probe Step”, “Feed”, and “Data Filter” can also be changed on the fly while the probe is in the middle of scanning your object.

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24. Use work offsets G54-G59 for nesting applications
The work offsets offer you a way to program up to six different machining locations. It’s like having multiple 0.0 locations for different parts. This is very useful especially when using sub-routines/nesting applications.

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25. Create a Rectangular Pocket / Slot with our selection of Wizards to help you build a tool path program
The Cycle Wizards for the mill or lathe makes it easy to create a simple tool path without needing to use a CAD and CAM software.
On this Wizard, the Rectangular Pocket / Slots, can be used to form a deep rectangular pocket into your material or machine a slot duplicating as many passes needed to its total depth.

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26. Create a Circular Pocket Wizard
Input the total diameter, the step down, and total depth and the code will be generated.

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27. Do Thread Milling using a single point cutter Wizard

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28. Cut a gear out using the Cut Gear Wizard with the optional Fourth Axis

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19. Disable the axis motors to manually hand crank each axis into place
Easily de-energize the axis motors by clicking [Disable Motors] to crank each axis by hand, and then press [Reset Control] to re-energize the axis motors.

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30. The MX interface can easily be interchanged from Mill Mode to Lathe Mode
Use this interface for your CNC Masters Lathe. It contains all the same user-friendly features and functions that comes in Mill Mode. Simply go to the Setup page and change the interface.

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31. Use Tool Change Compensation or the optional Auto Tool Changer Turret if your application requires more than one tool in a single program
You can offset the length and angle of each tool and record it under Tools in your Setup. The program will automatically pause the lathe’s movement and spindle allowing you to change out your tool, or allowing the optional ATC Turret to quickly turn to its next tool and continue machining.
On the MX interface, you also have four Tool Position buttons. Select your desired T position, and the auto tool post will quickly turn and lock itself to that position.

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32. Use the Lathe Wizard Threading Cycle to help you program your lathe’s internal or external threads in inches or metric

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33. Use the Lathe Wizard Turning / Boring Cycle to help you program simple turning and boring cycles without having to go through a CAM or writing a long program with multiple passes

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34. Use the Lathe Wizard Peck Drilling Cycle to help you program your drill applications or for face grooving

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35. Facing / Grooving / Part Off Cycle Wizards – with Constant Surface Speed
These cycles can be used with Constant Surface Speed allowing the spindle speed to increase automatically as the diameter of the part decreases giving your application a consistent workpiece finish. With CSS built into the wizard, there is no need to break down the cycle into multiple paths and multiple spindle speed changes.

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36. This is our list of supported G and M codes which can be found under Tools > G Code/ M Code List in the MX
If you plan to use a third-party CAM software to generate your tool path program, use a generic FANUC post processor and edit it to match our list of codes. As an option, we also sell Visual mill/turn CAM software which comes with a guaranteed post processor for our machines to easily generate your tool path programs based on your CAD drawings.

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37. Our pledge to you…

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10. Run each tool path independently to study its movement
1. Run the machine on Trace mode. You can run each tool path independently, one line at a time to study the tool path movement on the machine to verify the position of the application and if any fixture/vise is in the way of the cutter’s path.

2. You can also verify your program by clicking on the Trace and Draw buttons together. This will allow you to view each tool path independently one line at a time in the Draw Window.

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2. Clutter Free Interface
The MX is engineered for the CNC MASTERS machine so you do not have to fiddle with a detailed complicated configuration that can be overwhelming. Just load in the MX and start machining!2. Clutter Free Interface
The MX is engineered for the CNC MASTERS machine so you do not have to fiddle with a detailed complicated configuration that can be overwhelming. Just load in the MX and start machining!

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3. Features Tour and Tutorials Included
The Features Tour will give you a quick run-down on all the features the MX can do for you. The Tutorials are easy to follow even for the first time CNC machinist.
Feel free to download the MX on any of your computers. We recommend downloading the MX along with your CAD and CAM software there at the comfort of your office computer to generate your tool path programs. You don’t need to be hooked up to the machine either to test your program in simulation mode.

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4. Navigate and Edit Your Program through the MX interface with Ease
With a few clicks of the mouse or using touch screen technology, you can easily navigate through the MX interface importing saved programs into the Editor from the File drop down menu. Using standard windows features to edit your program you can then lock the Editor Screen to avoid accidental editing, and if you need to insert a line in the middle of a program, just click on [ReNum] to re-number your tool path list.
You can create a program or import CAM generated G-code tool paths into the Editor
The X Y and Z W arrow jog buttons are displayed from the point of view of the cutter to avoid confusion when the table and saddle are moving. You can also adjust your spindle speed and coolant control while jogging each axis.

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5. Feed Hold – Pause in the Middle of your Program
Feed Hold lets you pause in the middle of a program. From there you can step through your program one line at time while opting to shut the spindle off and then resume your program.
You can also write PAUSE in the middle of your program and jog each axis independently while your program is in pause mode.

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6. Hot Keys
Hot Keys is an alternative method to easily control your machine using your hard or touch screen keyboard. One can press P to pause a program, press S to turn Spindle On, G to run a program, Space Bar to Stop, J to record your individual movements one line at a time to create a program in teach mode.

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7. Pick Menu – for conversational mode programming
Write FANUC style G-codes directly into the Editor or select commands off the [Pick] menu and write your tool path program in conversational mode such as what is written in the Editor box. You can even mix between conversation commands and G-codes in the same program.

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8. Pick Menu List of Options
Use commands such as MOVE, SPINDLE ON/OFF, COOLANT ON/OFF, PAUSE, DELAY, GO HOME…. to write your tool path programs in conversational mode.

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9. Draw the Tool Path to verify it before pressing Go
Hit Draw to view your tool path program drawing, check out its run time, or even simulate the tool path in 3D mode. This can be helpful to quickly verify your program before running it. You can also slow down or speed up the drawing or simulation process.
You can also hit Go within the Draw Window itself to verify the cutter’s position on the machine. The current tool path will be highlighted and simultaneously draw out the next path so you can verify what the cutter will be doing next on the program.

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MX Software – Easy to Use, Easy to Learn – Included with your machine purchase
The MX software is designed to work seamlessly with your CNC Masters machine. It is made to work with Windows PC – desktop, laptop, or an all in one – on standard USB. Use it on Windows 8 or 10 64-bit operating systems.
No internal conversion printer/serial port to USB software or additional conversion hardware is used with the MX.

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11. Counters display in Inches or Millimeters – Continuous Feed
1. When running a program, the counters will display a “real-time” readout while the machine is in CNC operation without counting ahead of the movement.
2. The current tool path is highlighted while the machine is in operation without causing slight interruptions/pauses as the software feeds the tool path to the machine. The MX internally interprets a program ten lines ahead to allow for “continuous machining” avoiding slight interruptions as the machine waits for its next tool path command.
3. “Run Time” tells you how long it takes to run your tool path program.

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12. Use the “Go From Line” command to start in the middle of your program
If you ever need to begin your program from somewhere in the middle of it, use [Go From Line] which you can find under Tools. The Help guide will walk you through how to position the cutter without losing its position on the machine.

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13. Exact Motion Distance without over-stepping on an axis while jogging
Use “Relative ON” to enter a specific coordinate to jog any of your axes to an exact location without having to write a program. It’s like using “power feed” but easier. You can jog an exact distance on any of the axes without needing to keep the key pressed down and mistakenly over-step the movement releasing your finger too slowly off the jog button.
Let’s say you need to drill a hole exactly 0.525” using the Z. So you enter 0.525 in the Z box. Next, adjust the JOG FEED RATE slider for the desired feed rate. Then “click once” on the +Z or -Z button to activate the travel. In this case you click once the -Z button first to drill the hole exactly 0.525”. Then click once on the +Z button to drive the axis back up 0.525”.

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14. Teach Mode – Jog Input
You can create a tool path program by storing each point-to-point movement by simply jogging an axis one at a time. Click on either of the Jog Input buttons to store each movement on the Editor Screen. You can then add Spindle ON, feed commands, and press GO to run the new program as needed. This is a great feature to help you learn to create a program by the movements you make on the machine without necessarily writing out an entire program first.

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15. Override on the fly to adjust the Jog Feed to Rapid or the Spindle Speed during the middle of a program
1. Jog Feed and Rapid with Override: You can adjust feeds using the slider from slow minimum 0.1″ per minute to a rapid of 100″ per minute of travel. You can even micro-step your jog as low as 0.01”/min. The [-][+] buttons allow you to fine tune feeds in 5% increments while the program is in motion.
2. Spindle Speed with Override: You can adjust speeds using the slider from a slow minimum RPM to the max RPM according to the machine setup. The [-][+] buttons allow you to fine tune feeds in 5% increments while the program is in motion.

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16. Adjust Counters using Pre-Set if you cannot begin the program from 0.00
In a situation where you cannot begin your cutter at it’s 0.00 location, you can “Pre-Set” directly into the counters by typing in your beginning coordinate. You can press Go from here to run your program. You can also “zero all” or “zero” your counters independently. With one click of the [Return to 0.0] button, all axes will travel back to its respective 0.0 on the machine.

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17. Set and Save your 0.00 position for future runs
Set and save your 0.00 position on the machine. These coordinates will be recorded as the first line of the program in the Editor Screen. Should you desire to return to this program at a later date, you only have to click on the Set Zero Return button. This will command the machine to automatically jog each axis to its saved “set” 0.00 position according to the recorded coordinates at the first line of the program.

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18. Create a “Home” position to clear your application and run multiple times
Let’s say you need to machine one application times 100 pieces. This usually requires a jig to retain that physical 0.00 position. But in this case, you want the program to end with a clearance of the axes to easily switch out the next piece of stock and start again. With Save Home, you have the ability to save this offset (home) position while still retaining your Set Zero position where the machine will mill your part out. Pressing [Save Home] will record this new position under the Set Zero line in your program.
Pressing [Go Home] will jog your axes back to your “saved home” position where you originally pressed the Save Home command. You can also input GO_HOME from the Pick Menu as its own tool path in your program. At the completion of your program the axes will end at your Home position. Replace your part, then press [Return to 0.0] button to allow the axes to return to its zero position, and press Go to start your next run.

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