Sturdy and Fast all Steel CNC , my first build

[Boyan Silyavski]

Just installed it at its new home. The precision continues to surprise me. Instead of accumulating, all small imprecision neutralized each other, may be pure luck but still under 0.01 -0.03mm, it seems i can not measure it properly without introducing error. No need though, i am happy.

Surfacing aluminum resulted in glass like surface, small marks are not seen by naked eye and scratch test with fingernail leave impression of trying to scratch glass.

The C23 Bob works like a charm. But the integrated spindle control is erratic. I supply it with 12v stable voltage and it plays the output to spindle with 0.2v witch translates +-200rpm, which makes the spindle sound annoying. Will contact the maker. As i see it i will change the small pot with a big one external, in the hope to cure this problem. All PSUs i use are overrated at least by 100% and brand ones, so may be its the pot.

Next machine - no Flimsy: 8 wire alarm cables, connectors to box, 1 component paint.

The 0.8kw spindle seems now/ as i knew from the beginning/ way underrated. This baby deserves 3kw one and will be called - The Reaper :-). I am boasting :-)
But for its purpose is ideal.

Here is a video of it working. Unfortunately i forgot to make video when it was slicing aluminum and took it when we were testing some 3D jobs. I am surprised from RhinoCam, quite capable and i was able to figure in a minute how to program the 3d job.

A little noisy video, but i wanted to be heard what sound it makes. If i dont forget in a week or 2 will be making some aluminum parts there, so will make another one.

[ba99297]

I have no words
Excellent job
And one more time i want to say that Deans help , your ideas (about frame),Jonathans calculator, and Eddys suggestions drive me along this long trip that called cnc building. Thanks again.
One question
Are you using servos or steppers?

Thanks
Vagelis

[Boyan Silyavski]

3 NM steppers from Zappautomation coupled with AM882 drivers , driven by 650w Toroidal Psu at 70VDC / 2×50v rectified by power regulator board with 4 big capacitors that gives 70VDC at the output/.
Old Dell PC 2.8Ghz with 512 Ram, stripped reworked and hacked to be extremely light and fast + stable version of Windows Server 2003, 25khz Mach3, 1/8 microstepping, 4.2A motor selected by jumpers on AM882.
Deflection at any part of the machine at any direction less than 0.00mm under 100kg load/me/
20t HTD 5M Pulleys, 270mm belts 15mm wide. 1610 screws on all axis, 1605 on Z, 1:1,
Velocity 10m per minute,acceleration 800 at the motor tuning in Mach 3.
Temperature of motors at X and A 55 Celsius, at Y and Z 35 Celsius, when here 30 Celsius.

[Boyan Silyavski]

Yes, Dean and Johnathan are the guilty ones that all went that good. Not only them but all who criticized the initial design and followed the build which inspired me when I was tired. Great Forum. I bow to all the wisdom here.

[GEOFFREY]

Once again, brilliant. Not one of the advisors, but an enthusiastic onlooker!!! G.

[mitchejc]

Wow congrats Silyavksi that's a great looking machine!
If I may ask: Was it very difficult to align the top and bottom rails to get them parallel in the Z direction? Did you just epoxy cast the top and then bottom from the same level surface and the two rails were aligned or did you have to perform other magic tricks as well?

[Boyan Silyavski]

Wow congrats Silyavksi that's a great looking machine!
If I may ask: Was it very difficult to align the top and bottom rails to get them parallel in the Z direction? Did you just epoxy cast the top and then bottom from the same level surface and the two rails were aligned or did you have to perform other magic tricks as well?

Thanks!
read please post #93 , point 1 to 4, especially 4

It was a lot of thinking but once i figured the correct steps how to do it, it was easy. You will need a straight edge though, long enough that can lay on both long axis rails perpendicular. + Big enough square. Without that its not possible to align the machine correctly. Both can be obtained for around 100euro and this is money well spend. the links are somewhere in the thread.

[GTJim]

silyavski, this is a very impressive build. Thanks for sharing.