Hobby router – buying a DIY Hobby CNC milling machine

How do I recognize good quality and a reputable manufacturer?

Anyone planning such a large and expensive purchase such a CNC machine should know that there is in the field of CNC hobby kits (DIY Hobby CNC milling machine) and with some self proclaimed machine builders increasingly inadequate poor quality, at supposedly favorable price. There are also more and more low cost products from the Far East to which are completely useless without any revisions and improvements.

The security aspects should not even be mentioned. In China, the CE mark is glued in a non-standard spacing of the letters CE for example, and often misused. When asked, we received the answer it stands for China Export.

Many hobbyists want to buy a DIY hobby CNC milling machine in order to make individual work steps much easier. Some victims saw the purchase of a CNC milling machine as the last prospect of a job and registered a business. Numerous emails from victims on this topic have led us to identify the major drawbacks of the cheap DIY CNC Kits by examples and the most important criteria when buying a CNC machine.

The DIY Hobby CNC milling machine as a kit

CNC milling machines as a kit are due to the low price still very popular, especially with CNC newcomers.We are receiving more and more frequently mails from disgruntled kit Customers who purchase in various online auctions “CNC machines XXL” from do-it-yourself hobbyists and now have a non-functioning milling machine of great expense.

Such DIY hobby CNC milling machines / CNC machine kits and related accessories are sold from mostly private operators, always under the same conditions:

  • There is no indication of supplied CE declarations or manufacturer declarations available.
  • Detailed operating instructions with danger statements are completely missing or are inadequate and too short..
  • No designated contact person in case of emerging questions
  • No after-sales support
  • Mostly private providers
  • No warranty / return

Dubious sales strategies for DIY Hobby CNC milling machines / mills

Unfortunately some competitors use a dangerous trick:
For your own safety EMC testing is mandatory today. The electromagnetic compatibility of the CNC milling machine is measured. This includes the determination of the immunity of the milling machine to any interference. Some competitors have their CNC control run through an EMC test , but not repeat this for the successor models, they simply assign the same or a similar type designation as indicated in the first EMC test.
In this case, the CNC milling machine is no longer entitled to carry the CE mark, because even the slightest change in the CNC makes a new EMC testing required!
No valid EMC test means no valid CE declaration meaning not to have a operating permission!

Auctions for DIY hobby CNC milling machine / CNC machine kit

Sales of DIY Hobby CNC machine / CNC kit machines are mainly “private” , which means excluded return and without warranty for you. If a private guarantee is given, this is not legally binding and therefore invalid.

Large hobby CNC machines or DIY CNC units are often sold over 2000 euros, but the descriptions neither match the requirements of the machine, nor are they allowed to be allowed to be offered or operated in the EU, as they exclude a corresponding CE declaration.

In an emergency, this means that no insurance will pay for damage by fire caused by a CNC milling machine , if this does not have a valid CE Declaration, and is therefore not allowed to be operated. It is the responsibility of the buyer to demand this. Note: “No Declaration – do not buy!”

Because of the great danger arising by such machines, we would like to list a kit offered, to serve as a prime example of many dubious manufacturers of CNC hobby kits.

Original offer for a DIY Hobby CNC milling machine from an online auction site

New, immediately bootable 3-axis CNC machine with extremely long travel ways: X – 1800 mm, Y – 1000 mm, Z – 115 mm. For engraving and milling in wood, plastic and non-ferrous metals. Ideal for modellers, furniture designers, sign makers, etc. Control and all necessary connecting cables are integrated in the base body.

Spindle 1100 Watt, 6000-29000 rev / min and Milling Tool (8 hr) for woodworking. Suction device can be connected to any household vacuum cleaner. With the software PC-NC 3.1 (not included but available for 149 EUR) it is easy to operate the machine. So you can engrave or mill very precise contours, for example, from “Corel Draw”. There is only one computer needed (486 available) and you can start immediately.

Mechanical resolution of DIY Hobby CNC milling machine 0.012 mm per step. In wood you can mill up to 10 mm depth, but due to a high repeatability virtually any milling depth is achievable. With appropriate additional program (Visual Mill example) you can also mill 3D shapes.

Length of the workpiece is unlimited. The DIY Hobby CNC machine is very fast mounted or taken apart and can be , thereby easily transported with a every small car, and still remainsvery sturdy and precise.

1 YEAR WARRANTY. Delivery immediately after receiving the money, can also be collected. When inquiring about the delivery to other European countries, please mention City. VAT is not deductible, because of private sale. Happy bidding.

The collected photos of the amateur DIY Hobby CNC milling machine

Even an inexperienced DIY Hobby CNC interested person should at least notice something here finally:

  • DIY CNC Fräse abzocke

    DIY CNC Maschine

    A metric M8 threaded rod –

    Metric threads are only suitable for screw connections, not for motion transmissions! They wear out after a short time and have a lot of backlash. Here the flanks of the threads are too steep and too small to be able to exert the power transmission of the engines on the “slide” . This DIY CNC unit / DIY hobby CNC milling machine threaded rod is “beared”,in a 8.5mm hole in the aluminum profiles/aluminum sheet, of which the entire machine and all slides are manufactured, they even rub on each other.

  • Unstable installation of the engine –

    With a DIY Brass angle and 2 screws choked engine will provide a cutting capacity of 10mm cutting depth in wood. Milling forces of about 150 Nm can be expected on the cutter. The machine is likely to tie itself to a knot in the ongoing process or fall apart completely. The assembly of the limit switch is done unprofessionally and without any knowledge.

  • The so-called “CNC control unit” –

    arning dangerous! It is located in a wooden box, the cable ends are not secured, soldered or fitted with ferrules. Soldering is deficient. The board is screwed on the wooden floor without spacers. Here every EMC auditor would be scared!

  • EMC testing of the DIY Hobby CNC milling machine – 

    No separation of 12V and 230V. There is no strain relief. Caution: Danger! The required EMC test, which is necessary for the CE approval, can not be passed here! The golden cord is 230 volt energized and leads without strain relief directly as power supply to the milling spindle.

  • Materials of important mechanical components – 

    Here the wrong material was used for the key components: aluminum “slides” on aluminum! The backlash in the individual components will be about half a millimeter. By moving the milling machine or grabbing the “slide”, the entire mechanism would be bent. The engine was attached only by two screws.

  • The actual value of such a DIY CNC “kit” / DIY hobby CNC milling machine – 

    Often the purchase price is not justified in this case, the material value of the ill-conceived components is less than about 250 euros, at a sale price of about 2,000 euros. That should encourage to think about such machines!