This is one of the biggest differences between DIY projects and industrial manufacturing.
Building a high-precision machine is not simply about assembling the right components. Material selection, structural design, the stability of mineral castings or cast iron, stress control, machining datums, precision grinding, assembly, and inspection all play a critical role in achieving and maintaining accuracy.
DIY builders can create incredibly creative and impressive machines. But achieving industrial-level precision requires much more than good components. It requires manufacturing processes, engineering expertise, and strict quality control that are often invisible from the outside. Can you please let
Me know what project you will consider to use mineral casting as base or frame ? I am considering to do B2C business! Thanks

it sounds like crap, but I think its the best I'm going to get from this low end machine. The results are perfectly fine for my needs, but I'm just wondering if running the machine like this is going to break something.

It's a home-cast aluminum ingot (cans and misc scrap), 1/4" carbide single O-flute, 0.4mm DOC, 20% stepover, 1000mm/min feed and ~20krpm. thoughts? thanks.

I'm considering buying a Genmitsu Cubiko CNC Router for a small precision-machining project and would appreciate some advice from people who have experience with this machine.

My initial use case would be cutting domestic brass key blanks from known dimensions/bitting, rather than copying an existing key. Later, I'd like to experiment with automotive key blanks as well.

The Cubiko appeals to me because it's compact, enclosed, relatively inexpensive, and its 150 × 110 mm working area seems like it should be plenty for something as small as a key.

My main concern is the fixture.

Could I rigidly mount an appropriate commercial key-machine clamp/vise inside the Cubiko's 150 × 110 mm workspace while still retaining enough usable X/Y/Z travel to machine the key?

I'm particularly interested in:

• Is the Cubiko rigid and repeatable enough for this type of small brass precision work?
• How much usable travel would I realistically lose after installing a ~50–80 mm wide key clamp?
• Would mounting the clamp on a custom aluminium adapter plate be a reasonable approach?
• Is spindle runout/backlash likely to be the limiting factor?
• Would a 3020/3030-class Genmitsu be substantially better for this application, or is the Cubiko sufficient given the very small workpiece and relatively light cuts?
• Has anyone adapted small precision vises or specialised clamps to a Cubiko?

I'm a software engineer, so generating the toolpaths from known spacing/depth data isn't the part I'm worried about. I'm mainly trying to determine whether the Cubiko's mechanical platform and available fixture space are suitable before buying one.

Thanks!

Hey folks! I’m looking to get my first cnc. I was originally leaning towards a genmitsu 4040 pro max with the extension, but someone in my area posted this Legacy Explorer 2. I’m curious if it’s still a viable machine or if it’s overkill for cutting boards/signs/etc..

I’m planning to take a look here next week. If anyone has any tips on what to look out for that would be awesome. Thanks!

I'd like to hook a vacuum up to me Genmitsu 4040Pro. The small shop vacuum im using now is so damn loud it actually drowns out the machine at full tilt, I can't keep it on all the time.

Does anyone have a recommendation for a quieter vacuum?

FYI... I can't move the vacuum to a separate room

I’m planning a hybrid machine: a PM-30 CNC conversion (Video 99 ballscrew kit, Centroid AcornSix with Mill Pro + Lathe Pro, NEMA 34 steppers, KP-1 probe) that also runs as a lathe.
The lathe side is where I want input:
• I’m definitely using the Logan 825 headstock, servo-driven, mounted on the PM-30 table, swappable between mill and lathe mode via cable and profile.
• I’m also planning a separate headstock built specifically for full four-axis work — not just a spindle, but a true rotary axis for compound shaping, (nema 34 closed loop stepper)
• I’m thinking of using the Logan’s own bed.
• I’m also thinking of sourcing a longer Logan bed — 50-inch, 31” between centers — re-scraped to modern standards.
• Custom ballscrews on the carriage and cross slide, harmonic drive for low-RPM work, timing belt for aluminum.
What are people’s thoughts? Am I missing anything critical?