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### Question #: 4699

Question: Whats the maximum recommended speed to lase (engraving not cutting) a shape (say triangle) using the greenBull hybrid?

Current Solution

The feedrate at which to engrave using a CO2 laser will depend on the material, depth of engraving and intensity of the laser output. For instance, if engraving plastic, you can run the machine at a very high feedrate (i.e. 100-500 ipm) and a very low intensity. In converse, anodized aluminum will require high intensity and moderate feedrate. Engraving woods will require fast or slow feedrate and high or low laser intensity depending on the result desired.

With the greenBull, be careful with changes in direction at high feedrates as there is a very high amount of inertia with all of the components on the gantry. It is good to test raster vs. vector for some engraving patterns.

I should have specified my exact question better. Sorry. Where you say "be careful with changes in direction at high feedrates as there is a very high amount of inertia", what is the maximum allowed acceleration (conversely deceleration) you recommend using.

Respond:

### Other Possible Solutions to this Question

• While motor tuning what are the recommended steps per inch, velocity, and acceleration for the GreenBull CNC?

In the customer service live, just enter "motor tuning" and it will give you a list of all the recommended or default settings for our machines. However the acceleration and velocity for the greenBull(other machines) will be an actual determination on your trials. You will want the highest possible acceleration and velocity without the motors stalling, so you can do increments of ten to be on the safe side, if it is too slow try increments of 25.

The steps per inch is dependent on the microstepping:
Steps/Inch for the x and y
Steps = 200 motor steps per revolution x 16 microsteps = 3200 steps
Inches = sprocket number of teeth x pitch of the sprocket = 14 x .25" = 3.5 inches
steps/inch = 3200 / 3.5 = 914.28
This is really a starting point. You will then need to use the mach3 calibration function to get the perfect steps/inch value. Use as long a measurement as possible when calibrating.

Velocity:
Start with a value of 1000 ipm. Increase this value with a relatively low acceleration at about 10. You will notice at a particular velocity that it will stall. This is your stall velocity. I would take the stall velocity and reduce it by about 30% to 50% which should give you a good final safe velocity.

Acceleration:
Once the velocity is found, raise the acceleration until it start to stall at a low velocity. Reduce the acceleration by about the same percentage to stick with a safe acceleration.

The acceleration is mostly dependent on torque (current) and the top speed is dependent on the amount of voltage.

Give some tests with all of the axes running at the same time. If you notice and stalling, reduce velocities and acceleration depending on when the stall happens (top end, or acceleration curve).

X-axis
“CW8060 (6.0A) Driver”
Set to 5.43A, 1/16 Microstep
Dipswitches: 01100110 (“0”=down, “1”=up)
Mach3 Motor Tuning: 914.29 steps/in
Y-axis
“CW8060 (6.0A) Driver”
Set to 5.43A, 1/16 Microstep
Dipswitches: 01100110
Mach3 Motor Tuning: 914.29 steps/in
Z-axis
“CW8060 (6.0A) Driver”
Set to 5.43A, 1/4 Microstep
Dipswitches: 01100100
Mach3 Motor Tuning: 1600 steps/in

4th axis

• I'm planning on purchasing a Greenbull 5x (hybrid laser/spindel). What other expenses will I have for having a fully operationel machine

You will need to make sure you have a 220 volt outlet near the machine. You will need some wire to connect the electronics unless you purchase the redFly, redLear or redSprout plug and play electronics. To maintain cooling for the spindle, you will need some silicone tubing to provide for water exchange within the spindle, a bucket and pump to pump the water. You will need a table built as per the dimensions on the greenBull page:
https://www.buildyourcnc.com/greenBullCNCMachineKit.aspx

For cutting material, you will need end mills which are consumables that will be purchased frequently as they wear.

The pump and silicone can be found here: https://www.buildyourcnc.com/category/pneumatic-hydraulic

• what are the different (feed, travel,rotation) speed to use with planet cnc and a 5x10 greenbull to cut mdf please?

The feeds and speeds for cutting MDF will depend on the end mill that you are using and at the depth you are cutting.

The feedrates below are based on 18,00 rpm and using a spindle. Routers will not be able to handle these feedrates.

Our Onsrud end mills will cut MDF at 3/4" depth per pass at around 300 ipm using the compression end mill. A standard Onsrud single flute will cut MDF at 3/4" depth at 120-140 ipm.

A general purpose 2 flute end mill at 3/4" depth can cut at around 80 ipm from our experience.

• Hi i am interested in the greenBull 6x with Hybrid Laser/Spindle Head (includes Spindle/VFD and Laser Components) - USB Interface (Long Z). I was wondering how much it would cost to get this machine to NZ?

You can use our shopping cart to determine the shipping. Add the machine and the parts you want to purchase, enter your shipping address and click on the Calculate Shipping Button to get a price for shipping. The shipping charges are determined directly from the carriers at the time of pressing that button.

• Helo. I'm using Meshcam to generate the toolpaths. What type of files should I "save as" for the greenbull CNC using Mach3 with the UC100 USB to Parallel?

The file type to save for use with Mach3 is .tap or .nc. Make sure that you specify Mach3 as the post processor in Meshcam.

• where can i found the tutorial to install and connect the 40 W laser to the greenbull cnc

To install the 40 Watt laser on the greenBull, provided that you have the proper mount, go to the following page:

where can i found the tutorial to install and connect the 40 W laser to the greenbull cnc

• How to wire the Laser Power Supply with an arduino & GRBL ? (I'm not using a blacktooth laser cutter)

There is a th or tl on the laser power supply that serves as the trigger on a high or low signal. There is also a potentiometer "in" terminal that will accept a variable signal from 0v to 5v to control intensity. You can use either of these features to fire the laser tube.

If you have gotten grbl to work, then, no doubtedly, you have the expertise to know the output features of grbl. If grbl allows a pwm output, you can tie this to the potentiometer terminal on the power supply. Otherwise, you will need to use a digital output to control the power supply using th or tl.

How to wire the Laser Power Supply with an arduino & GRBL ? (I'm not using a blacktooth laser cutter)

• what is the recommended firmware for the awc708c laser controller? I see this download on the Sinjoe site: AWC708 Lite Update Firmware 160901L1

We have not had any issues with stock firmware on the AWC708lite. Upgrading the firmware will be at your own risk. We can contact our supplier and see if they can provide a suggestion for updating firmware. Contact customerservice@buildyourcnc.com to inquire with a person who can help.

Working area setting

Working area setting

• What is the recommended unit or brand of CPU cooling system for the 2.2 kw spindle on the Fabricator Pro machine

There really isn't any specific brand. We purchase the components in a disparate fashion from China. I will product a video today that shows all of the components that we use and also offer the components on the website.

From the upcoming video, you will be able to identify the parts is you feel you want to search for these components yourself.

• Motor tuning. While motor tuning what are the recommended steps per inch, velocity, and acceleration for the BlackFoot CNC?

These are the recommend values(default) for our blackFoot CNC machine, the acceleration and velocity can be adjusted as high as the motor can rotate without stalling! Suggested increment's will be by 10's.

blackFoot:
X-axis
“CW8060 (6.0A) Driver”
Set to 1/16 Microstep, 5.43A
Dipswitches: 01100110 (“0”=down, “1”=up)
Mach3 Motor Tuning: 914.29 steps/in, Velocity 400.02, Acceleration 4
Y-axis
“CW230 (3.0A) Driver”
Set to 1/16 Microstep, 2.7A
Dipswitches: 11001100
Mach3 Motor Tuning: 1422.22 steps/in, Velocity 400.02, Acceleration 4
Z-axis
“CW230 (3.0A) Driver”
Set to 1/4 Microstep, 2.7A
Dipswitches: 10101100
Mach3 Motor Tuning: 1600 steps/in, Velocity 79.98, Acceleration 5

how can we tuning the CNC motor

• What materials can the Greenbull machine cut? What materials can the laser cut? Can the laser etch?

The Greenbull machine can cut a very wide variety of materials ranging from foam to aluminum. We recommend the use of our 2.2kW spindle to allow the greatest flexibility. Aside from that, the most important thing is to use an appropriate end mill for the material you are cutting and to use appropriate speeds and feed rates.

BYCNC Response:
Our 40W laser can cut up to about 1/4" materials ranging from wood and acrylic down through lighter materials such as leather, fabric, foam, etc. Speed and final cut are greatly enhanced by an air assist upgrade. We also offer an 80W laser which has approximately twice the capabilities of the 40W.

What materials can the Greenbull machine cut? What materials can the laser cut? Can the laser etch?

• Hi, I intend on sculpting a surfboard out of a timber slab using the following kitset: greenBull 6x with Hybrid Laser/Spindle Head (includes Spindle/VFD and Laser Components) - USB Interface (Long Z). Will i need to purchase any additional items to have a fully operational cnc machine that is capable of carving the surfboard from a timber slab?

You will need to construct the table frame to your specifications and with a structure, fixtures and clamping to hold the timber that will be sculpted. You will also need the appropriate end mill that is designed to carve the timber. A dust extraction (vacuum) will be necessary to remove the dust and chips.

• I can't spot the differences between 4'x8' blackFoot and the 4'x8' greenBull (except for laser head option): please, can you tell me?

Only our greenBull CNC machines will be able to use the long Z-axis, due to structural construction of the greenBull over the blackFoot.
The height from the table top to the bottom of the gantry is: 4.25"

Both the maximum cutting height and diameter, will be dependent on the specific end mill/router bit you plan on using, since they can vary in length.
The maximum cutting height (useful to engrave or cut material)is: with spoil-board 3.875", without a spoil-board is 4.625"
The maximum diameter will (estimated) is: 3"

Specifically dealing with our greenBull long Z-axis CNC machines, depending on how you specifically design the table you can have more cutting height and a larger diameter clearance. If you only create a frame for the machine with a hollow center(adjustable midsection), allowing you to have a greater clearance.
Similar table image here: (https://buildyourcnc.com/Item/cnc-machine-greenBull-v4-6X#prettyPhoto/5/)

• Im in the market for a laser cutter with the ability to cut 8'x4' boards (different materials) and up to 5" height. I bought a greenbull 10'x5' a while back from you guys

Here's a link to the blackTooth laser that we sell, https://www.buildyourcnc.com/blackToothLaserCutterAndEngraver.aspx. It will vary depending which materials you are using, but keep in mind on how deep you are cutting since the blackTooth only cuts 1/4" inch(dept) at a time.

We will be carrying a 8' x 4' laser cutter in the near future. We will also design an attachment for the GreenBull to contain a laser tube at the head of the machine to convert a greenBull into a laser cutter.

• I have a greenbull 5x with the long Z. Is there a laser kit that I can get for that model?

Yes, we can provide a laser attachment for the long Z version of the greenBull 4x, 5x and 6x. Please call us to get more information and pricing for the laser attachment.

I have a greenbull 5x with the long Z. Is there a laser kit that I can get for that model?

• The laser adapter for the greenBull can host laser tubes more powerful than 80W?

The laser mount for the greenBull is designed and suited for a 40W tube only. The 80W tube is too large to mount on the gantry.

The laser adapter for the greenBull can host laser tubes more powerful than 80W?

• What is the shipping weight of the greenBull 4x assembled with dual laser head?

The shipping weight (with crate) of the greenBull 4X CNC machine with the dual laser/spindle head is 230 lbs. The overall dimensions are: 76"x36"x27". The crate is typicall send via freight.

What is the shipping weight of the greenBull 4x assembled with dual laser head?

• how much will it cost to post the greenbull 6X to New Zealand? my post code is 0930 if that is needed. Thanks!

You can use our shopping cart to determine the shipping. Add the machine and the parts you want to purchase, enter your shipping address and click on the Calculate Shipping Button to get a price for shipping. The shipping charges are determined directly from the carriers at the time of pressing that button.

• I purchased the greenbull with the electronics assembled, where are the wiring schematics to wire to 110 volt inverter?

There is another image on the spindle page here that shows another type of wiring using the R, T and E terminals for power. The image is one of the clickable main images on that page:

https://www.buildyourcnc.com/item/spindle-inverter-2!2kw-spindle-novfd