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Question #: 601

Question: WHAT IS D.O.F OR DEPTH OF FIELD FOR THE BLACKTOOTH LASER AND LENS?

Current Solution

Depth of Field. This is how far the focal point goes before re-expanding again. With a 2" lens, you have approximately 2-3mm of DOF. This means that you'll have 2-3mm of perfectly focused laser before it starts to re-expand again. If you have a 4" lens, you will have up to 7mm of DOF.

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Other Possible Solutions to this Question

  • I was wondering what the max depth is for something to go into the 40W C02 Laser cutter and engraver with blacktooth

    Hello, I was wondering if the Blactooth laser cutter can engrave in 3d, different depths in the same piece of wood?

    Additional Information:

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    I was wondering what the max depth is for something to go into the 40W C02 Laser cutter and engraver with blacktooth

  • what is the size/width of pulley and timing belt used in Blacktooth laser cutter ?

    The blackTooth uses MXL timing belt with 1/4" MXL Drive Pulley 20 teeth.

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    what is the size/width of pulley and timing belt used in Blacktooth laser cutter ?

  • Can we order a preassembled version of the blacktooth laser cutter and what would the lead time be.

    We do have the option of assembled blackTooth CNC.
    For further information on lead time and quote; please email (customerservice@buildyourcnc.com)

    Click the link to respond:
    Can we order a preassembled version of the blacktooth laser cutter and what would the lead time be.

  • What size and length of cable carrier suits the BlackTooth laser cutter?

    The space within the blackTooth laser cutter is so tight that a cable carrier will not fit.

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    What size and length of cable carrier suits the BlackTooth laser cutter?

  • What kind of cooling system should we set up for the Blacktooth laser cutter laser tube? Can tap water be used? Is water temperature critical?

    The blackTooth's 40 watt laser tube can be cooled with simple tap water. A bit of anti-freeze keeps the tap water clean and free of algae. The cooler the water, the better output you will get from the laser. A great source of information can be found here: http://www.buildyourtools.com/phpBB3/viewtopic.php?f=8&t=3452

    Click the link to respond:
    What kind of cooling system should we set up for the Blacktooth laser cutter laser tube? Can tap water be used? Is water temperature critical?

  • from what I understand, The BlackTooth Laser comes with an open bottom with no bed, does one pull air through this opening for fume ventilation through the bed?

    On the blackTooth laser cutter and engraver, the ventilation is at the back and there is a slit at the bottom front so when the machine is placed on a surface, the air will move from the front of the machine and out the back through the ventilation. This will move the particles past the mirrors and tube output efficiently with a reduced likelihood of building up on these important surfaces.

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    from what I understand, The BlackTooth Laser comes with an open bottom with no bed, does one pull air through this opening for fume ventilation through the bed?

  • I was wondering what was the difference between the two pair of goggles you are selling for the blacktooth. The tinted laser goggles and the Honeywell laser CO2 goggles

    The Honeywell brand goggles meet ANSI certification Z136.1, relating to the safe use of lasers, and are calibrated to optimally block the specific wavelengths of light produced by CO2 lasers (the details are available in the website description here: https://buildyourcnc.com/item/laser-components-goggles-safety-honeywell.) The generic tinted goggles also block the specific CO2 laser wavelengths, but a good deal of other wavelengths as well. That and frame style variation is the basic difference.

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    I was wondering what was the difference between the two pair of goggles you are selling for the blacktooth. The tinted laser goggles and the Honeywell laser CO2 goggles

  • For cutting with the BlackTooth, what is the best type of clear plastic/acrylic to use, and can you recommend a source?

    The blackTooth will cut acrylic very easily. The type of acrylic (cast or extruded) is not important since the acrylic itself has 100% absorption with CO2 lasers. Any plastic retailer, even the home improvements stores will have sheets of acrylic.

    Avoid using plastics that will off-gas toxic and corrosive fumes. One example is PVC which is Polyvinyl Chloride. The burning of that material will exhaust chloride into the air and combine with the hydrogen in the air causing a chemical reaction yielding hydrochloric acid which is corrosive and highly toxic to humans.

    Always read the MSDS (Material Safety Data Sheet) for any material that you intend to burn with the CO2 laser.

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    For cutting with the BlackTooth, what is the best type of clear plastic/acrylic to use, and can you recommend a source?

  • What is the footprint size of the Blacktooth laser machine?

    The footprint of the blackTooth laser machine is:
    Length: 37"/ 939.8mm
    Width: 33"-3/4"/ 857.25mm
    Height: 11"-1/8"/ 282.575mm

    The height will change with the doors that open to retrieve your material/project the highest point will be 28"-1/4"/ 717.55mm

    Additional Information:
    what is the maximum cutting depth of the blacktooth laser on plywood

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    What is the footprint size of the Blacktooth laser machine?

  • What is the dot resolution (size) of the BlackTooth laser?

    The dot resolution of the blackTooth is a combination of two specifications of the machine:

    - The steps/inch (or steps/mm) which is the resolution but not the dot size
    - The size of the actual dot, which is not specifically related to the resolution.

    The steps per or resolution can actually be a range, since the driver microstepping can be modified.

    A simple formula can be used to determine the resolution:

    step per inch = (motor steps * microstepping) / (travel at one turn of the motor in inches)

    if microstepping is set at 16 (1/16 on the driver) and you are using a pulley that has a pitch of .08 inches and 20 teeth on the drive sprocket

    = (200 steps * 16 microsteps) / (20 teeth * .08 inches)
    = 3200 steps / 1.6 inches
    = 2000 steps per inch

    To increase the resolution, just increase the microsteps on the driver.

    The actual dot size will depend on the lens you are using, the material being lased, the time period that the laser energy is applied to the material, and the focal height of the lens to the work surface material. The energy from the laser will converge to a point and create a dot on the surface (which is different than the kerf of the laser cut into the material).

    The dot will appear in different sizes depending on the material because, say wood, will burn causing a dot that burns the fibers of the wood and spreads a bit. The dot lased on the surface of a plastic, say Plexiglas, the dot will be smaller because the energy is absorbed only at that point, but since Plexiglas is a thermoplastic, a bit of the energy will melt the dot edges depending on the time frame (period) that the energy is applied to the surface.

    The focus of the laser energy from the lens looks like a cone converging to a point, then diverges outward after that point. Depending on the distance from the lens to the surface of the material, the dot will be bigger or smaller. You want to find focal point (where the energy is focused into a point). You can use the technique where you lay a material on a slope and lase that material along the slope to find the sweet spot (dot) and that will be your smallest dot, or kerf location. Remember that the kerf will widen or narrow within the material thickness depending on the focal length lens specification (the cone will be shorter or longer depending on the lens focal length).

    Click the link to respond:
    What is the dot resolution (size) of the BlackTooth laser?

  • what are the specs of the blacktooth laser cutter (dimensions and weight) when assembled?

    The blackTooth envelope dimensions and weight:

    - Length and width: 37" x 34"
    - The height: 11.25"
    - The weight: 70 lbs.

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    what are the specs of the blacktooth laser cutter (dimensions and weight) when assembled?

  • Will the new 100W and 130W lasers to be implemented for the very large vertical cutter feature the same lenses and mirrors as the 80 watt system? Will they feature the same focal distance and depth of field?
  • Is the blackTooth Laser Cutter available for custom size orders?

    We will generally consider a change in dimensions or machine features if the change will be beneficial to other users as well. This is due, in part, to the time it takes to make such changes and that it maintains the desired functionality and expected safety.

    What dimensional changes do you wish for the blackTooth?

    Additional Information:
    I was hopping to be able to have a cutting surface of 2' x 4'

    Additional Information:
    We have that size in our queue to be designed. However, you may be more interested in the laser adapter we are designing for the existing CNC machines to house a laser tube on the z-axis of these machines. This will be a quicker turnaround.

    Additional Information:
    Is there a time frame possibly to having this adapter made as well as cost? I am possibly looking to start a business so I am looking for something I can use to mass produce some specific parts.

    Additional Information:
    There is one project that takes precedence to the adapter, so I would expect in two months time.

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    Is the blackTooth Laser Cutter available for custom size orders?

  • Hi, whats the actual (with the fixed errata) laser electronic wiring diagram for the blacktooth? thank you

    Which wiring diagram are you specifically requesting? Due to your current model blackTooth? We currently have two wiring diagrams, Parallel Interface board (https://www.buildyourcnc.com/images/LaserWiringParallel.jpg) and the USB interface board (https://www.buildyourcnc.com/images/LaserWiringUSB.jpg). Also if you have the new model blackTooth with the control unit, we still do not currently have that wiring diagram in a document format!

    Click the link to respond:
    Hi, whats the actual (with the fixed errata) laser electronic wiring diagram for the blacktooth? thank you

  • WHAT ARE THE BLACKTOOTH LENS SIZES AND FOCAL LENGTH SPECIFICATIONS?

    The lens is 20mm wide and a 50.6mm focal length (the one included). This lens will stand up to at least 30PSI air assist.

    The mirrors are 25mm wide mirrors.

    Focal length is the distance from the lens to the material for the laser converge into the best focal point. If a lens is listed as 2". You measure 2" from the lens to the material, this will be the tightest point the laser can go before it starts to re-expand again losing focus.

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    WHAT ARE THE BLACKTOOTH LENS SIZES AND FOCAL LENGTH SPECIFICATIONS?

  • WHAT CAN ADD TO MY BLACKTOOTH LASER CUTTER MEASURE THE TIME OF USE?

    Hour meter. This will tell you exactly how long your system has been 'on' giving you a more accurate bead on the length of your tubes life.

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    WHAT CAN ADD TO MY BLACKTOOTH LASER CUTTER MEASURE THE TIME OF USE?

  • WHAT SOFTWARE CAN BE USED WITH THE BLACKTOOTH LASER CUTTER?

    If you take the standard parallel cable BoB (Break Out Board), then you will need control software (Mach 3 or EMC2) and CAM software to make your G-Code (such as CamBam). Personally I use CamBam and Mach 3, they work beautifully but don't expect to turn them on and know how they work out of the box. Give yourself a few weeks to get familiar with the basics. CamBam is VERY powerful software for it's price. I'm surprised how much I keep learning on what I can do with it...I highly recommend it if you want as much control as possible.

    Mach 3 + CamBam as a bundle costs $310. EMC2 will give you a free replacement for Mach 3 and is exclusively for Linux.

    If you use the USB BoB, it will cost an extra $75 + $75 for the software. This is an all-in-one package so no need for Mach 3 or CamBam.

    For etching rasters (jpeg, bmp, tiff, non-vectors, photos), I highly recommend PicEngrave. It has been a labor of love for the past 9 years and John has done a wonderful job with it. It easily compares in quality compared to software that is in the $200-$300 range. John's software runs $40 and can be found here: http://picengrave.com/ (don't let the modest website fool you, this stuff can do amazing things). DotG and the Mach3 engrave plugin are two other options and instructions can be found on Dustans page in the gallery on buildyourcnc.com website.

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    WHAT SOFTWARE CAN BE USED WITH THE BLACKTOOTH LASER CUTTER?

  • WHAT SOFTWARE CAN BE USED WITH THE BLACKTOOTH LASER CUTTER?

    I would say mechanically, between the official build instructions, Warren's awesome blog (http://blacktoothlaser.blogspot.com/) and the tips in the forum, the blackTooth is a really simple build. The challenges come with electronics and software. There's a number of different ways to drive the laser and motors. A decent understanding of electronics and computers is a must.

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    WHAT SOFTWARE CAN BE USED WITH THE BLACKTOOTH LASER CUTTER?

  • WHAT THICKNESS OF MATERIAL CAN THE BLACKTOOTH LASER CUT?

    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.

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    WHAT THICKNESS OF MATERIAL CAN THE BLACKTOOTH LASER CUT?