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J-TECH Hobby-Fab OX Instructions Manual

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OX Revised Build Instructions
Rev 4.5 09/29/2018
Intro:
Thank you for purchasing the Hobby-Fab OX kit. The OX is widely popular and can be found around the globe. If you run across a
snag, feel free to send us a message or hop online; there are communities just for this machine. You can join the G+ OX
community (https://plus.google.com/communities/110852928951643236736) where you will find a helpful, experienced group
that uses this very machine.
The OX was first generated by Mark Carew. Our group soon picked up the design, cleaned it up slightly, and the end product is
what you are about to build. Good luck with this project and we look forward to seeing the awesome things you will create!
The below instructions will assist you in building the Hobby-Fab OX CNC kit. Each step begins with a BOM, then guides you
through that step. If something looks confusing, or a term doesn't make sense, scroll a few photos up or down and the query will
most likely become clear.
Note:
The BOM has been double-checked by our team. We suggest a full inventory by the builder prior to beginning the build as well but
must warn, DO NOT open all boxes and dump all parts in a pile! This will make the build next to impossible to complete.
The extruded aluminum is cut to length. Pairs of the axis, i.e. both X gantry 20 x 60 and one 20 x 40 are cut together, surfaced
together, and bundled together to be an exact fit. The most frequent comment we get comes from builders unbundling the entire
kit and getting pieces and parts incorrectly assembled. We take extra precaution to ensure the kit goes together as smoothly as
possible. Leaving the extruded aluminum bundled up and parts in their step number box until you reach that step, will ensure a
smooth and quick build.
Shipping Damage – If there are any dents or dings in packaging please stop now and take pictures of the boxes. The most
damaged item in shipping is the aluminum extrusions. We will not replace damaged extrusions if the boxes are thrown away and
discarded prior to a notice being given about shipping damage.
Safety:
Use of a CNC can be dangerous. There is noise, electrical, respiratory, and other safety concerns. Please read about the use of a
CNC machine and understand its purpose and the materials you will be working with prior to continuing the build and use of this
machine.
Hobby-Fab, SMW3D, and its affiliates cannot bear any responsibility for damages or personal injury caused by the use of this
machine. It is up to the end user to ensure all safety matters are addressed and proper use of this machine is understood. Have
fun and be careful!
1 |
P a g e

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Summary of Contents for J-TECH Hobby-Fab OX

  • Page 1 OX Revised Build Instructions Rev 4.5 09/29/2018 Intro: Thank you for purchasing the Hobby-Fab OX kit. The OX is widely popular and can be found around the globe. If you run across a snag, feel free to send us a message or hop online; there are communities just for this machine. You can join the G+ OX community (https://plus.google.com/communities/110852928951643236736) where you will find a helpful, experienced group that uses this very machine.
  • Page 2 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 1 Z-axis: The M5 x 30mm bolts are pre-installed in the clamps. 600W upgrade: The 600w spindle upgrade is mounted in the same fashion. The builder will also find the 600w power supply in step one. P a g e...
  • Page 3 OX Revised Build Instructions Rev 4.5 09/29/2018 Laser upgrade: The spindle clamp with the M3 bolts installed will need to be the bottom clamp, see the end of this document for install. Exploded View. M5 x 8 bolts go into Tee-nuts, M5 x 15 go into V-Slot. Note here we are installing the black 90s on the inside, facing towards each other between the clamps, if this is difficult they can be installed on the outside (top and bottom) of the clamps.
  • Page 4 OX Revised Build Instructions Rev 4.5 09/29/2018 8. The smaller plate goes on the bottom, the bearing recesses (on the threaded rod plates) face each other. Install with 3 qty (per side) self-tapping screws and leave loose. Note, we provide a screw driver, but the self-tapping screws are much easier to set with a drill motor.
  • Page 5 OX Revised Build Instructions Rev 4.5 09/29/2018 Bearing recess P a g e...
  • Page 6 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 2: X_Z-Axis gantry plate assembly: Before we begin this step let us look at how to assemble a wheel assembly. Note the package comes with the bearings and shims loose. You will need to build the wheel kits. See here: Bearing, shim, wheel, bearing.
  • Page 7 OX Revised Build Instructions Rev 4.5 09/29/2018 The limit switch will face down. This is what will be considered the Z limit switch. P a g e...
  • Page 8 OX Revised Build Instructions Rev 4.5 09/29/2018 1. Begin by installing M5 x 20mm bolts in the center two holes, and the smaller holes as shown here: *NOTE: We added a Z limit switch during the writing of these instructions. The gantry plate has since been modified in shape. The sharper corners face towards the bottom of the Z axis.
  • Page 9 OX Revised Build Instructions Rev 4.5 09/29/2018 2. Next install 2 qty M5 nuts into the plastic ACME nut block. Note one side has cut outs for the nuts. P a g e...
  • Page 10 OX Revised Build Instructions Rev 4.5 09/29/2018 3. Tighten the M5 x 20 bolts holding the black plastic ACME nut block on, snug, do not crush the plastic nut… it is possible! The bolts need to be tight, not torqued. 4.
  • Page 11 OX Revised Build Instructions Rev 4.5 09/29/2018 6. Now we will install eccentric spacers on one spacer block and plain spacers on the other. Next install the thinner spacers (3mm) on top of the eccentric and standard spacers. The eccentrics (later) will allow for us to remove slack from the drive. Before installing the eccentric spacers, note that one set of holes on the rear of the X gantry plate is larger than the other.
  • Page 12 OX Revised Build Instructions Rev 4.5 09/29/2018 7. Install the eccentrics with the cut-out (on the flange of the eccentric spacer) facing towards the outer edge of the plate. 8. Install the wheels and snug up the M5 nuts holding the wheels onto the M5 x 45mm bolts. 12 | P a g e...
  • Page 13 OX Revised Build Instructions Rev 4.5 09/29/2018 13 | P a g e...
  • Page 14 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 3 Complete X_Z gantry assembly In this step, we will build the X_Z gantry assembly. 1. Begin by installing the ACME rod in the ACME nut block from step 2. (NOTE) The ACME rod is in bottom of the 12”x12”x12”...
  • Page 15 OX Revised Build Instructions Rev 4.5 09/29/2018 2. Install a 688zz bearing and lock collar on each end. Reverse order shown below, lock collar goes on first. 3. Position the Z axis from step one (with one removed threaded rod plate) over the wheels and slide into place. Be cautious of the tension between the wheels and the 20x80, if it is too tight make sure the eccentrics are properly placed.
  • Page 16 OX Revised Build Instructions Rev 4.5 09/29/2018 4. Next, with the screws loose on the threaded rod plate, we will align the bearings with the recesses in the threaded rod plate. 5. Push the bearings into the recesses of the threaded rod plates, then tighten the threaded rod plates in place. 16 | P a g e...
  • Page 17 OX Revised Build Instructions Rev 4.5 09/29/2018 6. Once the threaded rod plates are tightened down, lock the bearings in place with the lock collars. NOTE: you will need to leave about 2mm of ACME hanging out of the bottom of the lower (smaller) threaded rod plate. The above pictures shows an exaggerated amount hanging out for display.
  • Page 18 OX Revised Build Instructions Rev 4.5 09/29/2018 7. Check to make sure there is little to no play when you turn the ACME by hand. Also check to make sure the ACME does not bind when turning by hand. If it does either adjust the lock collars or threaded rod plates to remedy this. 8.
  • Page 19 OX Revised Build Instructions Rev 4.5 09/29/2018 9. Grab the NEMA 23 stepper motor install 3 qty M5 x 45mm bolts in any three holes, slide one each 20mm spacer and nine mm spacer over each bolt. 19 | P a g e...
  • Page 20 OX Revised Build Instructions Rev 4.5 09/29/2018 10. Now slide the stepper motor shaft into the coupler and run the three bolts into the matching holes in the threaded rod plate. 11. Follow this with installing three qty M5 nuts and tightening the coupler onto the motor shaft. Note: The spacers 20 and 9mm may be exchanged for 3 qty 1.5”...
  • Page 21 OX Revised Build Instructions Rev 4.5 09/29/2018 Tighten the M5 nuts to secure the motor. 12. Recall the eccentric spacers installed on one of the spacer blocks above. It is now time to give these a turn and take the side to side slack out of the Z axis.
  • Page 22 OX Revised Build Instructions Rev 4.5 09/29/2018 Taking the 8mm combination wrench turn each eccentric 1/8 of a revolution of a turn at a time. The wheels will get closer to the 20x60x180 extrusion. Do the top eccentric, middle, bottom. Physically feel the play in the wheel. If there is a lot of play, i.e. you can turn the wheel freely do another 1/8 of a revolution turn.
  • Page 23 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 4 X gantry assembly Note, again limit switches were added to the scope of the OX kit, some images below will not show the limit. The limit switch gets installed on the side of the head of the bolts as shown here: Revision update: In May of 2018 Hobby-Fab/SMW3D made a change to the motors and made wiring easier.
  • Page 24 OX Revised Build Instructions Rev 4.5 09/29/2018 The rear X gantry plate will receive six qty M5 x 65mm bolts. NOTE: If you purchased the Suckit dust boot, remove the arms from packaging and install them now. These are installed on the front plate and on the M5x65 bolts.
  • Page 25 OX Revised Build Instructions Rev 4.5 09/29/2018 Continuing. Slide these through the rear plate as shown. Slide a .25” spacer over the top bolts, and .25” eccentric spacers over the bottom bolts. 25 | P a g e...
  • Page 26 OX Revised Build Instructions Rev 4.5 09/29/2018 Next, install six-wheel assemblies over the bolts, followed by a .25” spacer AND 3mm spacer. Follow with another six wheels and matching .25” plain spacers and eccentrics as done in the beginning. 26 | P a g e...
  • Page 27 OX Revised Build Instructions Rev 4.5 09/29/2018 Install the X_Z assembly onto the front of the bolts and loosely tighten the M5 nuts to hold everything together. Do not snug the nuts down to the front of the X_Z plate yet as it will make installing the extruded aluminum difficult, we simply want to hold the assembly together.
  • Page 28 OX Revised Build Instructions Rev 4.5 09/29/2018 Next install a GT3 pulley loosely onto the NEMA 23 with the shoulder of the pulley closest to the motor. 28 | P a g e...
  • Page 29 OX Revised Build Instructions Rev 4.5 09/29/2018 The GT3 pulley should be a distance away from the top threaded rod plate by a distance equal to the thickness of a piece of paper. Use a piece of paper as a gauge and tighten the set screw on the pulley to the shaft of the NEMA 23 stepper motor. Lastly, the eccentrics on the bottom axles of this assembly, turn till the notches face up.
  • Page 30 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 5 X_Y gantry assembly Remove the X gantry extruded aluminum, the length will be based on the kit size you chose. It can be noted which bundle the X is because it contains two qty 20x60 and one 20x40 that are all the same length. For this demonstration, we will use the 500x750 build so the image can fit better on the screen.
  • Page 31 OX Revised Build Instructions Rev 4.5 09/29/2018 Carefully and slowly insert the two 20x60 extrusions into the X_Z assembly. If it is hard to install the assembly onto the 20 x60 make sure the eccentrics on the bottom of the X_Z assembly are facing towards the top of the assembly. Install a Y gantry plate on the end of the 20x60s using self-tapping screws.
  • Page 32 OX Revised Build Instructions Rev 4.5 09/29/2018 Note: Limit switch stop can be added here. A drop-in tee nut, M5 x 30mm bolt, and 20mm spacer will be assembled and inserted here. On the back of the 20x60 on the LH rear side, about 20mm(~1”) away from the gantry plate install in the middle slot: 32 | P a g e...
  • Page 33 OX Revised Build Instructions Rev 4.5 09/29/2018 This can always be adjusted later, tighten the bolt down for now in the approximate location shown above. The limit switch arm should contact the 20mm spacer. 33 | P a g e...
  • Page 34 OX Revised Build Instructions Rev 4.5 09/29/2018 Next, install a NEMA 23 Stepper motors on each Y gantry plate with M5 x 20mm bolts ad secure with M5 nuts. See revision note above pertaining to motor mounting. Also note limit switch installed on back of Y gantry plate edge. Install the GT3 pulleys on the NEMA 23 stepper motors.
  • Page 35 OX Revised Build Instructions Rev 4.5 09/29/2018 Install the upper wheels on the Y gantry plate with .25” spacers. The lower wheels get installed with .25” eccentric spacers. The bolts are installed with M5 x 30mm bolts and M5 nuts. Again, turn the eccentric spacers to give the most room. 35 | P a g e...
  • Page 36 OX Revised Build Instructions Rev 4.5 09/29/2018 You should be able to now set the Z, X, Y gantry on a table and tighten the X Gantry eccentric spacers (the ones located on the bottom of the X_Z assembly assembled in step four) tighten, by small even turns, both eccentrics on the bottom of the X gantry. You want the wheels to slightly drag, but not grab.
  • Page 37 OX Revised Build Instructions Rev 4.5 09/29/2018 Step 6 Y and Base gantry assembly GT3 Belt found in this step __ Ft (based on size) +4 tee-nuts per size larger build (for center supports) +4 cast 90s per size larger build (for center supports) +4 M5 x 8mm bolts per size larger build (for center supports) There will be other items in the step 6 box, these will be itemized below as part of the electrical BOM.
  • Page 38 OX Revised Build Instructions Rev 4.5 09/29/2018 Next grab the two 20x40 pieces bundled together that are very slightly shorter than the X gantry, in this model the X gantry is 500 the support pieces that will go in the base are 496mm. 38 | P a g e...
  • Page 39 OX Revised Build Instructions Rev 4.5 09/29/2018 Using the 5-hole 90s from this step install them between the 20x80 and the 20x40. Use Tee-nuts with M5 x 10 bolts in the 20x40 and self-tapping screws in the 20x80. 39 | P a g e...
  • Page 40 OX Revised Build Instructions Rev 4.5 09/29/2018 Use a speed square or some device that has a known good 90-degree angle and true the corner of the build, then tighten the screws down on all four corners. The base should be very sturdy now. Next, we need to add supports for the spoiler board.
  • Page 41 OX Revised Build Instructions Rev 4.5 09/29/2018 Install all cast 90 degree brackets by M5 x 8mm bolts, square and tighten. 8 qty M5 x 8 used in this example here. 41 | P a g e...
  • Page 42 OX Revised Build Instructions Rev 4.5 09/29/2018 Now lets us add the Y limit switch stop. Just as we did earlier use a drop-in tee-nut, spacer and bolt and set the stop in the rear of the 20x80 Y run on the side with the limit switch. The spacer is 20mm tall and the bolt is a M5 x 30, see below, this is held on with a drop-in tee-nut.
  • Page 43 OX Revised Build Instructions Rev 4.5 09/29/2018 Now it is time to install your spoiler board. The spoiler board is 1/2” MDF that can be purchased at any lumber yard or home goods store. Most will cut it to size for you if request. Measure the inside of the frame from one 20x80 Y to the other 20x80 Y, this is the width you need.
  • Page 44 OX Revised Build Instructions Rev 4.5 09/29/2018 Now we need to run belts. Tee-nuts and bolts are used to secure the ends of the belts, wrap the belt under the wheels and over the pulley: 44 | P a g e...
  • Page 45 OX Revised Build Instructions Rev 4.5 09/29/2018 Run it to the end of the gantry and slide a tee-nut over it. Tee nuts are used on the X gantry. Do not over tighten, we do not want to go through the belt with the bolt, just snug against it. Use an M5 x 8mm bolt. 45 | P a g e...
  • Page 46 OX Revised Build Instructions Rev 4.5 09/29/2018 End of the Y gantry shown above, give it a good pull and tighten the M5 bolt in the tee-nut. Don’t get too tight! You can go all the way through the belt if not careful, we do not want to go through the belt, just snuggly against it. If you didn’t already, align all pulleys and tighten the set screws now.
  • Page 47 OX Revised Build Instructions Rev 4.5 09/29/2018 Electronics Section. There are three possible configurations of electronics. Please see below instructions dedicated to groups based on the one you fit into. 1. Those who want to use their own controller. 2. Those who purchased the Simple all in one control box. 3.
  • Page 48 OX Revised Build Instructions Rev 4.5 09/29/2018 Contr. Orange illustrates Y motor opposite the control box. Blue illustrates how we want to lay out the X, Z, and 2-wire for the spindle. Red illustrates how we want to lay out the Y closest to the controller. The opposite side Y should run under the cable chain and jump through the bottom of the cable chain prior to exit.
  • Page 49 OX Revised Build Instructions Rev 4.5 09/29/2018 The opposite side Y motor from the control box side should run under the cable chain and jump through the bottom of the cable chain prior to exit. Group the X,Z and Spindle wires and run them through a cable chain to exit the Y gantry plate opposite the one shown above. 49 | P a g e...
  • Page 50 OX Revised Build Instructions Rev 4.5 09/29/2018 CABLE CHAIN LENGTHS: Group 1 2 and 3: Cable chain lengths depend on the size of your build. If you have a 500mm X axis then remove half the cable chain prior to installing. If you have a 1500mm build, combine 1.5 cable chains to make the X Axis.
  • Page 51 OX Revised Build Instructions Rev 4.5 09/29/2018 51 | P a g e...
  • Page 52 OX Revised Build Instructions Rev 4.5 09/29/2018 The other end will lay on the 20x40 and is installed with a drop-in tee-nut: 52 | P a g e...
  • Page 53 OX Revised Build Instructions Rev 4.5 09/29/2018 Install the cable chain with a drop-in tee-nut on the 20x40 behind the X gantry and the other end to the rear X/Z gantry plate. 53 | P a g e...
  • Page 54 OX Revised Build Instructions Rev 4.5 09/29/2018 Now, coming out of one side or the other Y gantry plate you should have wires that are connected to the X, Z, and opposite side Y motors and limit switches. Connect the last wire to the one Y stepper motor that is not connected. After, run all four wires and the spindle wire through the remaining cable chain.
  • Page 55 OX Revised Build Instructions Rev 4.5 09/29/2018 Attach the cable chain to the Y gantry plate threaded hole (9mm spacer, 15mm bolt) as we did earlier on the rear X/Z gantry plate. Attach the free end to the table with a wood screw. 55 | P a g e...
  • Page 56 OX Revised Build Instructions Rev 4.5 09/29/2018 Now let us connect to the controller, we are showing an M1 here, but the controller may vary. The connections will remain the same. Connecting to the control board Group 1. The following is an example wiring video from when we used to include a M1 control board. You can use this as an example of how to wire your machine with your controller.
  • Page 57 OX Revised Build Instructions Rev 4.5 09/29/2018 X goes to the top connector, Y then Y, then Z is the bottom. The colors of the wires are important! Connect them just as shown here. The limits will wrap around the other side and are (from top to bottom) X,Y,Z. Notice how the second Y motor has a reversed connection.
  • Page 58 OX Revised Build Instructions Rev 4.5 09/29/2018 Run spindle motor wires to the 600w power supply and connect red to M+ and black M-. Run 110VAC to the 600w power supply in the same fashion as the 48VDC power supply. 400W Plug into this rail, PWM+ and PWM- 600W Plug into this rail, 0-10V and GRN Connect the power supply to the controller and spindle speed control...
  • Page 59 OX Revised Build Instructions Rev 4.5 09/29/2018 Plug in the power supply to a wall outlet after checking all connections. Power down after you have noted lights on the controller and spindle speed control. There are 3 quantity capacitors included in the kit. If you have problems with noise on the limit switches, install them as shown here: 59 | P a g e...
  • Page 60 OX Revised Build Instructions Rev 4.5 09/29/2018 Not all will have this issue, but it does occasionally happen. 60 | P a g e...
  • Page 61 OX Revised Build Instructions Rev 4.5 09/29/2018 61 | P a g e...
  • Page 62 OX Revised Build Instructions Rev 4.5 09/29/2018 Communicating with the machine: Plug a USB cable A to B into the control board and the opposite end into a computer and plug the power supply cable into a 110V outlet. Start your computer and open a google chrome window. Go to this address: https://cnc.js.org/docs/desktop-app/ Download the appropriate desktop app for your system, OS, windows, etc.
  • Page 63 OX Revised Build Instructions Rev 4.5 09/29/2018 Setting Value Mask Invert X Invert Y Invert Z 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 To make changes, go to the Com screen. Look in the mid-left hand side of the screen. Note it is black with white text. At the bottom of this box you will see an area where you can type things, type in this box, $$ You will see what your current settings are.
  • Page 64 OX Revised Build Instructions Rev 4.5 09/29/2018 The machine is set up and ready to be used! Play around with the $$ settings. Set travel limits, set max velocities and accelerations. Have a read on our page about “How to CNC” here: https://www.hobby-fab.com/wordpress/2018/11/12/how-to-cnc/ Read about feeds and speeds here: https://www.hobby-fab.com/blog-post/what-is-the-right-feeds-and-speeds-for-my-cnc-...
  • Page 65 OX Revised Build Instructions Rev 4.5 09/29/2018 ALL IN ONE CONTROL BOX CONNECTION INSTRUCTIONS WARNINGS: Do not connect the 110VAC power cable till all motors are connected. Do not disconnect any stepper motors while the control box is powered. Mount the box to something non-conductive. A ground loop can be created between the box and machine if connectivity is allowed other than intended connections.
  • Page 66 OX Revised Build Instructions Rev 4.5 09/29/2018 Run the spindle motor wires to the 600w power supply and connect red to M+ and black M-. X Axis: Black/White = X axis limit switch Yellow/Blue = 1A 1B stepper motor pair Red/Green 2A/2B Y Axis: Black/White = Y axis limit switch...
  • Page 67 OX Revised Build Instructions Rev 4.5 09/29/2018 Power up instructions GROUP 2: Step 1: Gather laptop or PC and download cnc.js https://cnc.js.org/docs/desktop-app/ Step 2: Connect a USB cable from your computer to the All in one Simple control box. Step 3: Make sure the E-Stop is “out” this allows power to the control board. Step 4: Plug the 110VAC cable into the fused connection on the far left.
  • Page 68 OX Revised Build Instructions Rev 4.5 09/29/2018 USE: Every control box is tested prior to shipment. Based on your machine some changes may be required prior to use. E-stopping the box kills power to the motors but does not remove power to the program. In the event of an issue, one should be able to retain the current program and restart after homing.
  • Page 69 OX Revised Build Instructions Rev 4.5 09/29/2018 Setting Value Mask Invert X Invert Y Invert Z 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 For instance, when you typed $$ and hit enter, and your current $3=1 and your Z was going the wrong direction, try $3=6 hit enter.
  • Page 70 It is suggested to keep fire suppression equipment close at hand and prepared for an emergency. SMW3D, Hobby-Fab, J-Tech and affiliated groups hold no liability to property, personal, or any other damage created from the use of this product. The purchase and use of this laser add on system is strictly the end user’s liability and responsibility to ensure safe use.
  • Page 71 OX Revised Build Instructions Rev 4.5 09/29/2018 Shown above on the 400-watt spindle, 600w and 800w are identical. These holes should center the laser in the Y plane with the spindle center. Open the laser package and look for a small bracket that will fix a fan to the back of the diode laser. Install the laser diode with this bracket.
  • Page 72 OX Revised Build Instructions Rev 4.5 09/29/2018 The laser diode and fan wire should be routed through both the X and Y cable chain and exit near the control box area. The laser diode will connect to the driver board on the H3 header and the fan will connect to the fan header. 72 | P a g e...
  • Page 73 OX Revised Build Instructions Rev 4.5 09/29/2018 1 Shown uninstalled for relation NOTE: 1500x1500mm kits may need to extend these wires based on the control box location. If so, please use 16 AWG wire. Solid core wire should not be used inside a cable chain. Next connection will be the PWM signal.
  • Page 74 OX Revised Build Instructions Rev 4.5 09/29/2018 Connect the bare ended wire with the molex connector on the opposite side next to the laser connector, connect the other end to the PWM positive and negative connections on the board. Polarity matters. NOTE: If the kit came with a 400w spindle we will need to also plug in the spindle speed control to these connections on the board.
  • Page 75 OX Revised Build Instructions Rev 4.5 09/29/2018 Use: When the laser driver board is powered for the first time, every use, the reset button must be pressed. Insert the safety key, turn on the power and press the rest button. The fans should both come on along with a green LED indicating the driver board is ready for use.
  • Page 76 Focus Length and Gcode generation: The J-Tech diode has a focus length of around 3” from the factory. When setting the work piece home use a tape measure or calipers to ensure the diode is this distance away from the work piece. Set this as your Z=0.