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### Question #: 13283

Question: What is the Max thickness of wood that can be placed in the 4x8 cnc milling machine?

Current Solution

Tricky question. That depends on the way the table is built. If the table is built with a step down area, you can put as thick a material as you want. If the table is flat, the clearance is 6 inches. Now, the thickness depends on the size end mill you insert into the collet. If you use an end mill that has a 2 inch cutting length, then your material thickness is 4 inches without a spoilboard. If you need to mill thick material, I would suggest that you fashion the table accordingly so the table can accomodate any thickness you desire. That's one of the great aspects of the buildyourcnc machines, adaptability.

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### Other Possible Solutions to this Question

• What is the max thickness of material that the 80W laser can cut in plywood?

An 80 watt laser can cut plywood up to 1/2 inch thick. Make sure to use a high pressure source of air to knock out all of the charring during the cutting process so the laser can work efficiently.

I have a Chinese 80W laser. Just finished a cut test with 1/2" plywood. It cut through at 95% power 7-4mm/s with significant charring after two passes with no refocusing done between passes.

That's great information. What is your PSI of the air assist on your laser? What focal lens distance do you have? And where did you place the focus of the lens (at the surface, or within the material)?

What is the max thickness of material that the 80W laser can cut in plywood?

• I am building the CNC in your book - Build you own CNC Machine. One of the bearing thicknesses is 1/4" I can't find that bearing online. I can find 9/32, will that be a problem. Do you have a source? Thx

As long as the bearing has a minimum thickness of 1/4" and 9/32" is a bit thicker, there will be no problem with the book build using the bearing that is 1/32" thicker. There is actually more surface area which is better.

• What is the largest thickness of material that the BlackTooth can accomodate

A standard 40W CO2 laser will cut up to 1/4" thick of material, be it wood, acrylic, card stock, leather, fabric, foam, cork, etc. (Decent speed and final cut are heavily dependent on a strong air assist upgrade)

Metals cannot be cut due to the power level and wavelength of the CO2 laser. But it can be marked with special solutions like Cermark or Thermark.

What is the largest thickness of material that the BlackTooth can accomodate

• Can you preset an origin point on this cnc? How long does it take to jog over? (If I have the case that I using the same thickness of maple wood, and same jig everytime)?

Yes, you can preset an origin by zeroing the machine at the desired location before beginning your work. You can return to that exact point at any time, or you can specify an offset from that point to be the beginning point for the next machine operation (for instance when cutting several parts from one sheet of wood.) Jogging time varies by machine and application but would generally be a rapid move -- our default rapid setting is 400 inches per minute.

• I was wondering what thickness of material the 'book' design can handle on the z-axis?

The book CNC build has a restricted Z-Axis travel due to the design of the Z axis assembly. This machine is best used for sheet material. You can modify the bed of the machine so that there is a depressed area that thicker stock can be placed. The travel of the book CNC build is approximately 5 inches. Increasing the dimension of the gantry from rail to rail will allow a longer z-axis assembly increasing the z-axis travel.

I was wondering what thickness of material the 'book' design can handle on the z-axis?

• hi i just what to know if this cnc machines can make 3D wood carving & if can u ship to México?

Yes the CNC will do 3D wood carving and we can ship to Mexico. email sales@buildyourcnc.com for more information.

hi i just what to know if this cnc machines can make 3D wood carving & if can u ship to México?

• Is there any way i can order replacement wooden parts for a cnc machine

Yes, you can order replacement wooden parts, but since we don't have them as products on the website, you will need to call us directly using the number at the top right corner of the website by hovering over "need help?"

Is there any way i can order replacement wooden parts for a cnc machine

• I am looking at buying the blacktooth-laser-cutter-engraver-40w. Can you give me some idea of the types and thickness of material this machine will cut and/or ingrave?

Considering that "materials being lased by may emit gasses that are harmful to humans (corrode human tissue and cause damage to respiratory organs). Always read the MSDS (Material Safety Data Sheet) for the material to be lased. You can find these MSDS from manufacturer websites for the material you are considering for use in the laser system."
We successfully have worked on Thin sheets of Brasswood, glass, foam, plexi-glass. The thickest materials you will be able to successfully cut is 1/4".

• Just bought Build Your own CNC Machine book. It is missing the chapter on lead screws that is described on page 181 at the end of Chaprer 16. Where can I get this info?

It sounds like you got a misprinted book. If you purchased it from us, please contact us directly for a replacement. If you bought it from Amazon or a third party, you'll need to contact them. General information about lead screws is available on this website and at buildyourtools.com.

• THE CNC MACHINE IS UNSAFE WITH EXPOSED SPROCKETS THAT CAN DAMAGE FINGERS AND HAVE CLOTHING CAUGHT IN IT.

These machines are inherently dangerous. Before the machine moves, the machine should be clear of any person by a dimension of at the distance of a persons reach plus a few more feet. This is the policies we institute in our shop and what is recommend to all of our customers. Treat these machines as you would treat any major power tool in the shop.

With that said, you can certainly add some protective parts, but still keep folks away even with those installed. I would use the gantry side to do all of the mounting of the protective parts. Consider using sheet metal that you can bend and make a simple installation right on the gantry side.

THE CNC MACHINE IS UNSAFE WITH EXPOSED SPROCKETS THAT CAN DAMAGE FINGERS AND HAVE CLOTHING CAUGHT IN IT.

• Please can you suggest which cutting machine is very suitable to cut vehicle tires of any thickness precisely and neat, thanks

Any of our machines can cut or mill tire material. What you need to consider is the machine size (will the tire fit in the machine with the proper modifications to the table) and the milling tool (end mill) used to mill or cut the tire material. The end mill will need to be specifically designed to mill the volcanized rubber material and the steel belts embedded within the tire.

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

• Please can you suggest which cutting machine is very suitable to cut vehicle tires of any thickness precisely and neat, thanks

Any of our machines can cut or mill tire material. What you need to consider is the machine size (will the tire fit in the machine with the proper modifications to the table) and the milling tool (end mill) used to mill or cut the tire material. The end mill will need to be specifically designed to mill the volcanized rubber material and the steel belts embedded within the tire.

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

• What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

The frame size difference of the NEMA 23 and 24 is very slight and, depending on the motor mount both will most likely fit. The bigger difference between these stepping motors is the torque. Make sure that the motor that you purchase has the appropriate torque for the axis that it will move.

Is is safe to go with the higher torque? Or if the torque is too high for what i need is that bad?

You can use a motor with higher torque. Just make sure to select the correct driver for that motor.

The frame size has nothing to do with torque. Nema 23 means a 2.3" frame. Nema 24 means a 2.4" frame. That's all. Either could have more or less torque depending on speed and power.

What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

• What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

The frame size difference of the NEMA 23 and 24 is very slight and, depending on the motor mount both will most likely fit. The bigger difference between these stepping motors is the torque. Make sure that the motor that you purchase has the appropriate torque for the axis that it will move.

Is is safe to go with the higher torque? Or if the torque is too high for what i need is that bad?

You can use a motor with higher torque. Just make sure to select the correct driver for that motor.

The frame size has nothing to do with torque. Nema 23 means a 2.3" frame. Nema 24 means a 2.4" frame. That's all. Either could have more or less torque depending on speed and power.

What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

• I'm considering the purchase of your Blacktooth laser. I will be engraving on my wood blocks that are two inches in thickness. Will the Blacktooth accomodate this thickness material?

Yes, the blackTooth actually has a base that is open, so you can set the blackTooth laser cutter on a surface that is depressed as much as you need so you can accommodate a work piece with very large heights.

• Can a CO2 CNC laser machine be used for welding of thermoplastic materials?

That is a good question. We have not tried to weld thermoplastics using our CO2 Lasers. It is possible since the laser outputs a heat source and at the right intensity and speed, the thermoplastic can be heated and melted rather than instantaneously vaporized and off gassed. I have done research to see if CO2 laser can weld thermoplastics with positive results.

Our CO2 lasers are typical of other laser cutters on the market, so if their literature, or examples you have found, successfully weld thermoplastics, then ours will probably be able to as well.

In some cutting test with different speeds and intensities, the kerf has welded back together; however, this was caused by an unintentional process rather than an intentional one.

Can a CO2 CNC laser machine be used for welding of thermoplastic materials?

• What tolerance can I expect from your largest cnc machine and the laser cutter? Also, what depth can I get on the z axis?

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

The tolerance of our machines, like any machine, depends on several variables. The major variables include the manufacturing tolerance, the type of machine control used, the precision of assembly, the thoroughness of maintenance, and the initial and ongoing calibration of the machine. Because we sell kits only most of these variables are outside our control. Therefore, we are hesitant to guarantee a certain level of tolerance for an end user. However, in our experience, tolerances of .001" are readily achievable with our machines.

• Which cutting machine is suitable to cut vehicle tires of any thickness precisely and neat

Any of our machines can cut or mill tire material. What you need to consider is the machine size (will the tire fit in the machine with the proper modifications to the table) and the milling tool (end mill) used to mill or cut the tire material. The end mill will need to be specifically designed to mill the volcanized rubber material and the steel belts embedded within the tire.

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

Can we arrange for a specific modification of cutting the you're like you suggested... The aim is to cut the tires into specified shapes( circular, rectangular or squares) with neat edges. Also would ave the modifications made in other to be able to cut the width of the tires into two there by expising the metal strings in the tires
Please let me know if you get the idea and your take on the modification you think would suffice..
Thanks.
Femi

Which cutting machine is suitable to cut vehicle tires of any thickness precisely and neat

• Do you offer a touch plate kit? If not can a touch plate kit be added to your machines if so whats the process?

Yes, you can add a touch plate kit. A touch plate works just like a limit switch. All you need are alligator clips and a conductive plate. Solder a wire to the conductive plate material and connect that to an IN (input) terminal. Connect the alligator clip to the gnd of the input and then to the end mill. Enable the home setting for the Z axis in Mach3 or Mach4 and use the "ref all home" button to home all of the axes. The z axis will home at the touch plate. Make sure that the touch plate is under the end mill when the z-axis is in the homing process.

Here is a tutorial I made a while ago that explains this:
https://buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx

Let me know what you think by click on the "submit response".

Thanks

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