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AltMill MK2 4×4

(74 customer reviews)

$3,160.00

The AltMill is the pinnacle of hobby CNCing, bringing industrial-level precision to a price point and ecosystem for both beginners and advanced users. The AltMill MK2 4×4 is your go-to CNC when time, performance and precision are crucial.

Highlights include:

  • Production level cutting speeds (approx. 600 inches/minute)
  • Closed loop motor system on all three axis to auto-correct positioning and auto-stop when necessary (reliable for production style work)
  • Requires little maintenance during project production
  • Advanced, production-style features including Y-axis auto-squaring; limit switches by default; and tram adjustment capabilities
  • Cuts materials ranging from hardwoods to plastics, foams, composites, aluminum – even steel
  • Support for 80mm spindles and routers
  • 49″ x 49″ working area with a max Z-height of 5.5″
  • Footprint of 59″ wide and 62″ deep

The AltMill MK2 4×4 comes with a standard 80mm spindle mount only. It does not come with a spindle, which must be purchased separately.

The current lead time for delivery is 5 to 7 weeks. Please check our Order Status page for an estimated completion date of your order.

New CNC users, Read these Resources to Ensure a Successful Start. When assembling the AltMill, use the Resources as well as the assembly video for a successful start. The assembly resources have up-to-date information.

    Description

    ***Included with your AltMill MK2 4×4***

    • SLB-EXT controller and emergency stop
    • Partially pre-assembled rigid frame
    • Inductive sensors for homing
    • Sturdy metal legs with the ability to add 4ft wide shelving underneath
    • Welcome package

    ***Not included with your AltMill MK2 4×4***
    Check out our recommended products tabs for an ideal set up, but note the following ARE NOT included with your order:

    • Computer or laptop
    • Spindle
    • End mills or bits
    • T-tracks
    • Waste board (e.g. MDF 2ft x 4ft sheet)
    • Set of metric Allen keys, standard bits or drill for assembly

    ***Some photos may contain items for illustrative purposes, such as spindles, caster wheels, t-tracks, or additional shelving. There may also be cosmetic differences between the machine in the photo and the production version of the AltMill.

    Lead times
    This product has a potentially long waitlist, relative to demand and seasonality. For more info on expected shipping and delivery times, please see our Order Status page.

    Additional information

    Weight 76 lbs
    Dimensions 38 × 11 × 12 in
    Include Spindle and Dust Shoe Kit

    Include Spindle and Dust Shoe Kit, Machine Only

    origin-criterion

    C

    Measurements & Specifications

    Specifications

    • Rigid frame and linear motion design using HGR15 linear guides and ball screws on all axis mounted to a custom-designed, machined aluminum extrusion
    • Closed loop stepper motors for over 600IPM
    • Support for 80mm spindles and routers
    • 49″ by 49″ working area with a max Z-height of 5.5″
    • Inductive sensors for homing included
    • Sturdy metal legs with the ability to add 4ft wide shelving underneath
    • Footprint of 59″ wide and 62″ deep

    Must Have Add-on: Spindle & Dust Shoe

    Unlock the full potential of your AltMill with a 1.5W or 2.2KW ER Spindle and Dust Shoe Kit

    Each 1.5KW ER20 Spindle & Dust Shoe Kit comes with:

    • 80mm Dust Shoe
    • ER20, 80mm, 1.5KW 110V Air-Cooled Spindle
    • 110V, 1.5KW, 3-Phase VFD
    • AC power cable and 5m spindle power cable
    • ER20 1/8, 1/4″, 3/8″and 1/2″ collets (one of each)
    • Data cable to connect to the AltMill/SLB-EXT controller for remote speed control

    Each 2.2KW ER20 Spindle & Dust Shoe Kit will come with:

    • 80mm Dust Shoe
    • ER20, 80mm, 2.2KW 220V Air-Cooled Spindle
    • 220V input, 2.2KW, 3-Phase output VFD
    • NEMA 6-15P AC power cable and 5m spindle power cable
    • ER20 1/8, 1/4″, 3/8″and 1/2″ collets (one of each)

    FAQs

    Choosing an AltMill vs a LongMill

    Payment

    Full Payment is required at time of purchase to get your order into the Queue. We ship on a first-come, first-served basis. If you choose local pick-up, you are subjected to the queue order and cannot get your machine quicker.

    Power Requirements

    Altmill with the 1.5kW spindle. We recommend allocating 2x 15A, 110V/120V circuits — one for the spindle, the other for the machine and a computer.

    • The AltMill consumes 500W and runs off a 48V 10A power supply, 110-120 volt circuit
    • The 1.5KW Spindle Kit consumes 1500W at max load, 110-120 volt circuit

    Altmill with the 2.2kW spindle. We recommend allocating 1x 15A, 110V/120V & 1x 20A, 220/240 Circuit — one for the spindle, the other for the machine and a computer.

    • The AltMill consumes 500W and runs off a 48V 10A power supply, 110-120 volt circuit
    • The 2.2KW Spindle Kit consumes 2000W at max load, 220-240 volt circuit

    If you live in a country with 220V/240V power you must use a transformer to convert to 110V/120V.

    • To solely run the machine, you need a rating above 500W
    • To run the machine and 1.5kW spindle, you need a rating of 2000W

    Altmill Power Supply Specifications: Input: 100-130 VAC 50/60 Hz, 7-54 Amps, Output: 48 VDC 10 Amps, 480 Watts

    International Shipping

    We do not have distribution centers but we ship internationally from our office via UPS.  Shipping costs vary from $300  to $1900 USD. You are responsible for any taxes, duties and brokerage fees.

      • HS Code 8465.91
      • Carton Sizes and weights
        • Package 1, 62x16x11 (in) 70 lbs (X rail box)
        • Package 2, 62x16x11 (in) 70 lbs (Y rail box)
        • Package 3, 37x10x11 (in) 65 lbs (Main box)
        • Package 4, 15x13x5 (in) 20 lbs (Spindle kit)

    3rd Party Spindles

    I would like to source my own spindle, what should I be aware of?

    • For spindles 2.2KW or above, you will need to install extra 220VAC wiring
    • The AltMill comes with an 80mm spindle mount, we do not have larger diameter mounts at the moment
    • The VFDs that may work with our controller are: Huanyang v1, Huanyang P2A, Yalang YL620, H-100, and GS20, however they are not plug-and-play — read this article for further information

    More Information

    Check out our comprehensive FAQs for prospective customers, addressing questions such as power requirements, spindle sourcing, and bundle deal info. 

    Warranty

    The AltMill has a 120 day warranty once it arrives at your door.

    We want you to have a great experience with your machine, so if any parts are found to be missing or damaged, please email us. We will ensure that you receive the support you need to restore your AltMill to operating condition or provide a full or partial refund.

    You may cancel an order if it has not shipped yet, please contact us if you wish to do so. We do not accept returns for AltMills that have already shipped.

    General Warranty and Limits of Service:

    Effective March 11, 2024

    Throughout this policy the words “we”, “us” and “our”, or “Sienci Labs” will be used to refer to Sienci Labs Inc. herein and “AltMill” or “machine” will refer to Sienci Labs’ Sienci AltMill. Additionally, the words “you”,  “your”, “user”, and “operator”  will refer to the original purchaser/customer, user, or viewer of any of the products or media provided by or through Sienci Labs.

    Sienci Labs Inc. (the “Company”) grants the AltMill (the “Product”) a standard warranty within Canada and the US to the original customer to be free from missing parts, defects in material, and defects in workmanship for a period of one hundred and twenty (120) days from the date of receipt by the original purchaser. Sienci Labs Inc. will ensure that the appropriate support is provided to the original customer to restore the AltMill to operational condition or provide a full or partial refund under the sole discretion of the Company.

    This warranty does not cover damage due to improper use or assembly, lack of maintenance, normal wear and tear, or modifications to the AltMill which are not produced or authorized by the Company. Consumables such as cutting tools and sample or stock materials which may have come with your AltMill are not included in this warranty.

    This warranty will become void if the operator does not follow the Safety Warnings and Guidelines, uses the Product for illegal purposes, intentionally causes damage to the Product, or transfers the Product to another owner.

    The original customer must contact Sienci Labs Inc. within one-hundred and twenty (120) days of receiving their order to make a warranty claim to be eligible for warranty service. Proof of purchase, tracking number, email address, or other material will be used to confirm the original purchasing date and the identity of the original customer. If damage was due to shipping, original packaging materials must be kept in the original received condition. Photos, videos, written descriptions, and other items may be requested to assess and validate a warranty claim. 

    In the case Sienci Labs Inc. requires the original parts to be returned, the customer is solely responsible for packing all items securely. Damage incurred during return shipping will not be covered by the warranty. A method of payment such as a credit card may be requested by Sienci Labs Inc. to cover shipping costs or damaged items if Products are not eligible for warranty service.

    Assembly Instructions & Help Resources

     

    Get Inspired

    74 reviews for AltMill MK2 4×4

    4.9
    Based on 74 reviews
    5 star
    89
    89%
    4 star
    8
    8%
    3 star
    1
    1%
    2 star
    1
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    1 star
    0%
    1. Neil S. (verified owner)

      This has been a great machine so far. I have only scratched the surface of its capabilities.

      (0) (0)
    2. Daniel C. (verified owner)

      The machine went together quickly and everything fit as described. I’m still setting up the area under the machine so I haven’t used it other than to manually run to the different corners and check out the basic functions.

      (0) (0)
    3. Chris Wineland (verified owner)

      Very robust machine, only thing i wish could be different would be it shacks alot, almost afraid of it coming apart.

      (0) (0)
    4. Charles Blaker (verified owner)

      Excellent CNC machine, can’t say enough good things about it. I have been using my Altmill 4 x 4 for about a month now and have made several successful projects along the way. I did have a couple of challenges up front after the assembly, but they were quickly resolved, one on my own, and one with the exceptional assistance from the Sienci Labs team. It should be noted that both of those challenges were user error – me being in a hurry. The assembly was challenging, but the video helped to make sense of it all. I did miss one step some how and installed the sensors wrong. I didn’t catch the edit that described inserting the sensor into the bump stop, I originally installed them in a different hole. Your support team pointed that out to me when I sent them a picture. All is good, I am very happy with the machine.

      (0) (0)
    5. Francisco Baez (verified owner)

      Price is good

      (0) (0)
    6. Kelly T. (verified owner)

      Working great!

      (0) (0)
    7. Jean Davenport (verified owner)

      Overall I am happy with my purchase. For anyone considering buying the Altmill, be prepared to spend a great deal of time educating yourself on building, setting up, installing, and add-ons that you may need to consider.

      Inevitably, there will be issues and you will need to learn how to navigate through the forums and help links. Be patient and keep an open mind with the software issues; my suggestion is to visit the forums and get familiar with the issues posted and how to search and resolve those issues and spend less time trying to fix those bugs and think… I remember reading about that somewhere.

      The major consideration in selecting this CNC over others was the variety of resources on Youtube and the Sienci website. The Sienci support team was available and guided me through several issues; some my fault and some not my fault.

      If CNC is not your day job, plan for a month to get it up and running.

      J

      (0) (0)
    8. Ron O. (verified owner)

      I absolutely love this machine. It is so well designed and has excellent instructions. I have put many days on my AltMill cutting wood and aluminum and had no issues, it works very well. I would absolutely buy again!

      (0) (0)
    9. Doug E. (verified owner)

      I have had a LongMill MK2 for 3 years, it has been a great machine to achieve the goals of learning CNC machining. The new Altmill was easy to assemble and video and handbook was easy to follow. This machine was the perfect upgrade to the LongMill 48×30. Customer service was great, just had a small shipping issue but was expected due to the unpredictable circumstances. I’m currently making small projects in order to establish trust with the CNC process. I will move on the larger projects as this trust builds. (Sometimes these machines seem to have a mind of their own.) 😂 Thanks for producing a great product.

      (0) (0)
    10. Anonymous (verified owner)

      Great sturdy product.

      (0) (0)
    11. Jim Shigley (verified owner)

      It is obvious that your team has spent a lot of time getting this right, the machine fit together flawlessly, everything went so well, not a single issue. I am very impressed with the machine and how it is built, and the rigidity of it!

      (0) (0)
    12. Joshua Cole (verified owner)

      I’m a first time CNC user and I have found the Altmill to be a very sturdy quality machine. Only issues I’ve had were due to my inexperience as a new user. There was some damage to one of the Y-rails during shipping but Sienci sent me a new Y-rail quickly. Customer service was top notch. I’m a happy customer

      (0) (0)
    13. Martin Serre (verified owner)

      I’m not a very experienced CNC user yet, but this machine has already saved me a noticeable amount of time in my cabinet-making work. With more practice, I’m confident it will significantly increase my productivity and allow me to take on projects that would have been complex or tedious with traditional machines. I’m very pleased with its performance—and I’m also looking forward to creating some fun projects for friends and family.

      The included software is a major improvement over my previous smaller CNC, and the machine itself is both fast and precise.

      Note: To achieve truly professional results, it’s helpful to have a good working knowledge of VCarve and Fusion 360.

      (0) (0)
    14. Alex Hough (verified owner)

      The setup of my machine was pretty easy. I just followed the online setup video, and the machine was almost ready to use. I had a bad e-stop and had to get them to send me a new one. The part arrived very quickly.

      In the meantime, I just disassembled the bad switch and made a jumper wire to bypass the button. Everything worked great.

      One thing I found out that I was not initially planning for was dust management. I would highly recommend picking up a dust collector to go along with this if you don’t already have one.

      I was able to use fusion 360 to generate my g code and I was off to the races.

      I also found that I wanted to be able to do laser engraving and shaper inside cutting than I could get with milling bits. To do this, I picked up a JTech 64w Altmill kit. I’m using fusion to generate Gcode for laser cutting, and I’m using Lightburn for laser engraving.

      This has been an awesome pair. I’m stoked that I’m able to make some super cool stuff now in my garage now.

      I would highly recommend these machines to anyone looking for a good home CNC.

      (0) (0)
    15. James Sanders (verified owner)

      I had never created a file, or ran a CNC prior to this.
      My purchase was influenced by the on-line tutorials, and I like the idea that the Company and Machine is a product of Canada.
      The build video, as well as the introduction videos were/are very handy.
      The machine itself is very robust. Very impressed with the operation of it.
      My only issue is two of the nuts that secure the axis sensors were cross thread, straight out of the box. These seem to be a queer size, as I haven’t been able to source them anywhere.
      Considering all the engendering and programing required to make this machine preform, I’m impressed the only issue is a couple of nuts.

      (0) (0)
    16. Mike H. (verified owner)

      We are so happy with this machine! It’s highly capable and very quick. So much good design in this machine! This is the 5th high-end hobby machine (including all the big names from the last 15 years) I’ve used, and the Altmill Mk2 is by far the best in capability and performance. It’s amazing how cool the motors remain, even under strong use. Highly recommended! (There’s a good chance I’ll purchase a 2nd one in the near future — no need to consider alternatives.)

      (0) (0)
    17. Raul Santana (verified owner)

      I’m new to CNC, and the Altmill 4×4 made learning easy. Setup was simple, the build is solid, and the accuracy blew me away. Every carve has been clean consistent and awesome. The community is quick to respond and helpful with beginner questions. This machine along with gsender gave me the confidence to start real projects fast. Highly recommend for anyone wanting a reliable and beginner-friendly CNC.

      (0) (0)
    18. Daniel Solberg (verified owner)

      Easy assembly, solid machine, runs great. Glad I made the switch to the AltMill.

      (0) (0)
    19. Ron A. (verified owner)

      Absolutely easy to set up. Documentation really well done.

      (0) (0)
    20. Paul Stuart (verified owner)

      The machine is very well made. Im impressed with the accuracy. Took me a while to build as being very carefull not to make a mistake. An image legend of the screws, bolts ect. would have helped.

      (0) (0)
    21. Raymond purdham (verified owner)

      Love this machine

      (0) (0)
    22. John Lingenfelser (verified owner)

      Machine is the coolest thing I’ve ever owned!

      (0) (0)
    23. David Bloomquist (verified owner)

      Excellent product. Had issues with some of the motors which Sienci quickly took care of.

      (0) (0)
    24. Sean (verified owner)

      Still waiting on the 2.2 kw spindle to complete my set up of the machine. I would love to give you a good review but tough to do so when I can only get part of the machine.

      (2) (2)

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