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Centroid Acorn CNC controller FAQ


1.) Can i buy one Pro Acorn CNC12 license and use it on several Acorn CNC control boards?

Answer: No, the Centroid Acorn Pro and Digitizing Bundle licenses are tied to the Acorn board serial number. When purchasing a Pro or Digitizing Bundle license the Acorn serial number is required and then a Pro or Digitizing Bundle license is created that matches the Acorn board serial. When the CNC12 software starts it checks the Pro or Digitizing Bundle license against the Acorn board that is connected to the CNCPC for a match. If it matches then that particular level (Pro or Digitizing Bundle) of CNC12 software is active. If it doesn't match then the CNC12 software runs at the "Free" level. (So Acorn CNC12 will run without any license installed)


2.) If I buy an Acorn Pro CNC12 license and then decide to upgrade to the Digitizing Bundle license how much does that cost?

Answer: $399


3.) Can I buy an Acorn Mill Pro and Acorn Lathe Pro and Acorn Digitizing Bundle for use on the same Acorn Board?

Answer: Yes.


4.) Can I ask Centroid to move a Pro or Digitizing Bundle software License from one Acorn board to another?

Answer: If Centroid issues an RMA for an Acorn board to be returned, any License associated with that board can be transferred to another Acorn board.


5.) Do I have to state at time of purchase what machine I plan on using the Acorn with?

Answer: No. Both the Mill and Lathe Free version of Acorn CNC12 control software is available for download so you can configure the Acorn controller for a wide variety of machine tools.. The hardware doesn't care what kind of machine it connected to:-)


6.) If i bought an Acorn Mill Pro License can i use it with the Acorn Lathe Software?

Answer: No. The Acorn Pro License is Mill and Lathe specific. The is a Pro License for Mill and the is a Pro license for Lathe


7.) If i destroyed the BBG (Beagel Bone Green) that came with my Acorn board can i supply my own?

Answer: Yes, but the License file(s) for that were issued for that Acorn will not work with the new BBG. Centroid offers License file transfer service for $29 and requires you to email us a file. here is how to generate a file. to


8.) How big of a G-code program can i run with the Free version of CNC12 software?

Answer: 50Kb. To give you an idea of what can be done with the Free version of the Acorn CNC12 software: on our website is a part program for a SEM DC servo motor cover plate, below on the left is the plate being installed and on the right is the tool path that was used to make the cover plate. This G code program to make this part is 5Kb in size.

This is pretty typical of a home hobby shop type part. The G code file generated by a cad cam system or in this case Centroid's Intercon conversational programming software (with comments!) to make this part the G-code program is only 5kb in size. The Centroid FREE version of CNC12 has a file size limitation of 50KB so you could run a G code program 10 times this size with the Free version of CNC12. As you can see, you can do a lot even with the Free version of the Acorn CNC12 software.
Note: The Centroid PRO version of CNC12 has no file size limitation so you could run a file as large as the hard drive on the CNCPC and the Digitizing Bundle License also has no file size limitation. (only limited by the size of the CNCPC hard drive space)
Here is a link to the 5kb Gcode program used to cut this SEM servo motor cover plate

9.) How long does it take to ship the Acorn CNC control kit?

Answer: Typically the Acorn CNC control kits are in stock ready to ship and ship within one or two business day from Howard, PA UPS GND. You will receive and email with tracking number when your kit ships.


10.) Do i have to have a paypal account to order a Acorn Kit?

Answer: No. Add items to the cart with the add to cart button and then select "Pay without a Paypal Account"


11.) Can I order an Acorn CNC control kit over the phone? and do you have resellers in the EU?

Answer: Centroid accepts orders for Acorn kits soley through our website.

Several Acorn re-sellers accept phone orders such as"


Automation Technologies







12.) Do you have a list of drives that Acorn works with?

Answer: The Acorn CNC controller commands many different types of servo and stepper motor drives with industry standard "Step and Direction" drive communication signals. The list of compatible drives is too long to list here, highlights are Yaskawa, Delta, Estun, Panasonic, DMM, Teknic Clearpath, Gecko, Leadshine, Teco to name a few. So, any drive that accepts Step and Direction is compatible with the Acorn CNC Controller.
(If you require Velocity Mode drive communication please consider our OAK CNC control board.)


13.) Who do i contact for Technical Support?

Answer: Free Acorn Technical Support is available 24/7 on the Acorn CNC community support forum. Centroid Direct Technical Support is available for $90/hr. one hour min. purchase support here and email


14.) Do i need to purchase a PC from Centroid or can i build my own.

Answer: Ready to run Centroid CNCPC's are for sale on the Acorn web page, alternatively you can supply your own CNCPC as long as it meets the Centroid Minimum PC performance specifications found here.


15.) What is the Acorn Return, Warranty and Repair policies?


Centroid Acorn Returns and Warranty Claims

Return/Refunds: Subject to the terms provided herein, all returns for refunds must be made within fourteen (14) days from the date of purchase. All questions or comments relating to returns should be referred to or by calling Centroid DIY sales at (814) 353-9218. To qualify for a refund, the product must be in re-sellable condition, which shall be determined at Centroid's sole discretion. Factors affecting the re-sellable condition of a product shall include, but are not limited to: obvious signs of use or abuse; customer negligence; excessive wear and tear and/or damaged/missing product or parts. Where it is determined, at Centroid's sole discretion, that the product is, in fact, re-sellable, Customer will be given a full refund or credit for the product, less the cost of shipping. (a refund request does not include shipping cost either way in the refund amount) Customer should expect a refund within 7 to 14 business days of Centroid's receipt of the product.

Acorn Warranty Claim: If you require Acorn replacement unit.
1.) Purchase a replacement Acorn kit on our website.
2.) Forward the paypal receipt to requesting a RMA for return of the defective Acorn board.
3.) Ship the defective Acorn back to Centroid according to the instructions accompaning the RMA email from (Acorn boards returned to Centroid for warranty claim must be accompanied by an RMA issued by Centroid.)

If a retured Acorn is found with defective parts covered by warranty this will trigger a paypal refund of the Acorn purchase price and shipping cost to the customer. (a warranty claim refund does include replacement shipping cost in the refund amount, the refund typically will occure within 7 workings days from receipt of Acorn return.) However, any part that is different from the original configuration or obviously damaged by the customer no refund will be issued.


Centroid warrants to the original purchaser that any part of its product purchased will be free of defects in workmanship and parts for a period of twelve (12) months from the date of delivery (hereinafter "Warranty Period"). During the Warranty Period, Centroid will, at its option: (1) provide replacement parts necessary to repair the product; (2) replace the product with a comparable product; or (3) refund the amount Customer paid for the product upon its return. Replacement parts or products will be new or serviceably used, comparable in function and performance to the original part or product, and warranted for the longer of thirty days for the US or the remainder of the warranty period. Any additional purchases or upgrades will not extend this warranty. This product warranty covers normal use only. This product warranty does not cover damage caused during shipment and any damage caused by: actions that are beyond Centroid's control, including without limitation, impacts, fluids, fire, flood, wind, earthquake, lightning or similar disaster, war, lockout, epidemic, destruction of production facilities, riot, insurrection, or material unavailability; unauthorized modifications, attachments or peripherals; improper use, environment, installation or electrical supply; improper maintenance; any other misuse, abuse or mishandling. Except for the warranties expressed in this agreement, Centroid disclaims all other warranties, either express or implied, including implied warranties of merchantability or fitness for a particular purpose, other than those warranties implied by and incapable of exclusion, restriction or modification under the applicable law. The term of any implied warranties that cannot be disclaimed are limited to the term of this agreement. Centroid’s and customer's maximum liability to the other is limited to the purchase price customer paid for products or services plus interest as allowed under the applicable law. Neither customer nor centroid will be liable to the other for property damage, personal injury, loss of use, interruption of business, "down time", customer's time, loss of use of related equipment, lost profits, lost data or other consequential, incidental, punitive or special damages, however caused, whether for breach of warranty, contract, tort (including negligence), absolute or strict liability or otherwise, other than those damages that are incapable of limitation, exclusion or restriction under the applicable law. Acorn is an educational DIY (do it yourself) product. Centroid makes no warranties or claims of safety or suitability for any application. Any schematics or wiring hookup instructions presented on Centroid’s website or in the online forums are incomplete educational examples for discussion only. The user, DIY’er is creating his/her own CNC device, which may include dangerous voltages, powerful motors and resulting dangerous unexpected forceful motion, of dangerous cutters and fast moving heavy machine parts . If you are not qualified to accept all responsibility and/or you do not agree, DO NOT PROCEED and request a refund.


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