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CNC - Build Logs

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Hi All, as promised in the other thread here's the start of the build log and research log.

Frame materials:
20x20 T/V Slot aluminium 20x80
20x80 T/V Slot aluminium 20x80
Corner blocks
SBR16 + SBR16uu open bearings. Supported Linear Rod
MGN12 Linear guide. Linear Guide
Decided against using V wheels as the chatter and wear when milling aluminium becomes an issue, instead, I will be using 2x supported linear rod (Here) for the Y-axis. Then 2x Linear Guides on the X-axis (On gantry).
For linear motion, ball screws instead of lead screws, much less backlash.
Ball screws do require custom mounting solutions though, so the standard openbuildsCNC machines make use of lead screws and anti-backlash nuts, ball screws also have an efficiency of 90+%, whereas lead screws have a 10-80% efficiency.
Yes, ball screws do require more maintenance, but overall will provide a much better motion transfer.
I haven't quite got to designing the Z axis yet, time has been a little thin.
Proprietary laser cut steel plates as well, for extra stiffening.

Electronics
3x Nema 23 112mm or one smaller.
1.5KW Spindle + 1.5KW VFD.
Arduino CNC board
Arduino Uno
MKS TB6600 Stepper Drivers
1x12V PSU
MKS CD V10, allows the TB6600 Drivers to be used.

I Will update as I go along.
 

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Ended up changing to a large form factor corexy 3D printer...

Sorry about that guys, but to do a CNC Properly would have been well over 20k.
 

Razia

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Please tell me you're going for a Voron 2.4.

I'm so tempted but don't want to delve into the depths yet.
 

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Please tell me you're going for a Voron 2.4.

I'm so tempted but don't want to delve into the depths yet.
Nope, my printer makes that frame look like it's made of spaghetti 😂 .
Based a large portion of my design on the Ender 7's top belt system instead, but am using a 20x40mm t-slot with die-cast brackets, as well as external brackets.

Also, a belt-driven Z-axis poses many large issues, mainly how do you stop the gantry from sliding, even if you make sure the steppers don't disengage after a set time.
Also, accuracy starts to become a concern, based on certain calculations a belt can be worse on resolution, especially if you can't get anything smaller than a 16t pulley for the axis (IMO).
For that reason, I'm using TR8x2 lead screws.
 

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