This is the Part#1 video showing how I built the Frame assembly of my 1st CNC milling machine at home (workshop).
You can see the "Bricklaying concept" applied in design & build process.
And hope animations embedded help you understand the process with easy.
1. Design contents of the Frame
1) Overall dimension : 436 X 570 x 830 (W x L x H)
** Machine drive unit stroke : 400 / 220 / 262 (x / y / z axis)
2) Law material : Steel tube 100 x 100, thickness 2.0
3) End plates (Th.8.0) with tap nuts or Closing plates (Th.1.6) for both end of tubes
4) Nut plates (Th.5.0 or 8.0) inside of tube for fixing hang-on parts
2. "Bricklaying" ("Lego brick masonry") concept
Each Frame assembly (Base, Column) has mainly 4 sets of frame. 2 Main frames each side and 2 Spacer frames in between them with 130mm long bolts for connection.
* Total 64 bolts are used for entire Frame assembly.
* Every frames are filled with Epoxy concrete (w/gravel and sand) inside.
1) Merits
- Frames avoided heavy metal work (casting, milling etc.) in parts fabricating
- Lower weight, so as to be handled by hand, without help of crane.
* Highest weight of Column 9.6Kg in Frames
- Easy future design change (upgrade, rebuild for enhancing the capacity) by adding frames and reinforcements as needed.
2) Risk
- Difficulties of dimensional accuracy control of the assembly with this concept, several times accuracy check and adjusting had been done through the frame building to final assembling of driving parts (Linear block, ball screw etc.)
* Though those risks and recovery actions gave me more hassles in each step, I had really enjoyed them throughout whole build!
The contents of Epoxy concrete packing and Base stand building skipped in this video and next Part# videos will be uploaded in order. Look forward to them please.
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Thank you~