New build – input/comments appreciated

**ngundtoft** · 08-09-2015

Hi CNC Experts

For some time now I have planned to build a 3-axis CNC router. I will primarily use it for wood working, mainly loudspeaker building, but also for general wood working including dovetail joints. However, I would also like to use it for work in aluminium, mainly for making front and rear panels for electronic cabinets and for engraving them. I could also imagine using it as a 3D printer.
I have looked at various home pages and forums for inspiration, but MYCNCUK seems to be most in line with my own ideas. So after having learned from the projects on these pages, especially the machines described by EddyCurrent and Kingcreaky, also comments from Jazz have been very useful, I have made some drawings and a part list, and now I would really appreciate any comments on this, before I start buying parts and putting them together.

Work area: X-axis: 733mm, Y-axis: 580mm, Z-axis: 220mm

Frame made of 50 x 50mm and 50 x 100 (3mm) steel profiles. I intend to use the epoxy self-levelling support technique (30 – 40mm wide channels, 5mm thick).
Gantry made of aluminium profile.

Mechanical parts:

Ballscrews (C7): RM1610: X-axis: 1015mm x 2, Y-axis: 800mm x 1, RM1605: Z-axis: 340mm x 1
Ballscrew supports: BK12 (fixed end) x 4, BF12 (loose end) x 4
Ballnut housing: 1610 x 3, 1605 x 1
Linear rails: Hiwin profile 20mm, HGH-CA (HA, CW)), standard preload Z0. X-axis: 1000mm x 2, Y-axis: 750mm x 2, Z-axis: 416mm x 2
Pulleys: 20T, 21,8mm Dia., 8mm hole x 8
Belts: 15mm HTD, 1:1, (20T : 20T).

Electrical parts:

Stepper motors: Nema 23 - SY60STH86-300BBF, x 4 (parallel connection)
Stepper drivers; Leadshine EM806, EM860 or AM882 x 4
PSU Linear, 70V, 9A. 500W toroidal transformer (rectifier, capacitors, softstart)
Controller Smoothstepper, or Pokeys57E
BOB Machschmidt BOB v1.5, OPPBV3 (DIY CNC) both require separate spindle control board (e.g. SP5 V5 Spindle Board from DIY CNC). Alternatively Chinese board with built in spindle control: http://www.ebay.com/itm/6-Axis-CNC-M...item1c3dfdfbde
Spindle motor: 2.2KW with VFD and water cooling.

Software;