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https://www.youtube.com/watch?v=p5e9iqf6M98


To the cnczone community...

I've replaced the first video in this thread with the newer, edited one here.
See the new description with the youtube...

> If you don't want to hear what people have to say, don't end your post with "Feedback and comments welcome".

How did I know you'd come back with that ; )
My answer is.. I seek out forums like...

@awerby
Rather than only criticizing my methods why not, at very least, ask my *why* I did certain things rather than assume or judge.

I added the plaster step because it gives me the opportunity...

https://www.youtube.com/watch?v=UqCfLG0jfe0&t=27s


I'd like to present this DIY process for CNC to metal casting.
If you have a CNC machine and a casting furnace you can do this yourself. ...

Finally finished my new Designer CNC Machine!

Large travel, 4' x 8'. Focus on inexpensive materials (LVL), light-weight stable Z-axis, and modern control (Arduino Grbl).
Chain driven X/Y, with...

@peteeng
Very nice machine! Nice work. That ship is a really deep relief and impressive build.

I finally finished my Designer CNC Machine rebuild.

https://www.youtube.com/watch?v=V1PKRULlD4I...

Hi Peter,
I would be interested to see that machine. Do you have a video, plans, or links to it?
What is the travel/bed size of the 0.1mm machine?

> "Its fine to design a machine using chains...

PS. I should have joined cnczone years ago. Making up for lost time I guess. In general I'm too busy to post much so I'll likely disappear for another 10 years until my next machine.. lol. When I...

https://youtu.be/pNVwrx3W-5o

This is from 2015.

My latest machine has 1mm accuracy on XY axes, chain driven. Rebuilding Z now.

Looking at your attached CNC jpgs, I have some suggestions:

- Avoid the motor mounted vertically above the Z leadscrew. At that height the top-heavy axis will sway like the Tower of Pisa (I know...

Since you're working with a table, rotating the work might not be possible. Especially if it's large. If the work is radially symmetric (lathable), or radially millable (like a face), you can build a...

I want to add a vote for chains.

Why:
- Chains are the only real cost effective option for high precision at larger sizes.
- Leadscrews just too costly at 8'
- Belts are hard to get precision...

I found a simple way to test if it's a weight problem:
With no end mill (for safety), and your spindle powered up.. assuming it drops without Z-axis cmds, light press upward on the Z-axis with your...

Nice work.

Many interesting challenges here. I also wanted a low cost, larger, yet fast CNC router. Now on my 3rd build iteration.

Some quick take aways:
- At large sizes, deflection is an issue. Keep...

For that precision, depends a lot on your Z-axis framing, slides & drive. The frame should be metal boxed in.

The slides can be linear or pillow block, but should be hefty and good quality.
The...

Movable gantry vs movable table:
Very simplified:
CNC Mill (metal) = table
CNC Router (wood) = gantry

It all comes down to weight and speed at larger sizes.

Let's say you want to route a...