Choosing aluminium profiles

[NordicCnc]

Hello everyone. I am new to this forum but I have built a CNC mil before and also converted a manual lathe to CNC, so the subject of DIY CNC is familiar to me. The CNC mill was built with 50x50x3 steel profiles and was welded mostly. The linear rails were also the bad version and not Hiwin rails. The spindle motor is a HF 1.5kW water cooled.

I have now started designing a new build. It will be a moving gantry build that I want to be able to machine aluminium with, and steel if possible. I intend to use following components for the build:

• 2.2kW HF spindle, water cooled
• Nema 23 servomotors, brand JMC iHSV57-30-18-36, 2x on Y-axis, 1x on X-axis and 1x on Z axis.
• 20mm Hiwin linear rails, 2x on Y-axis (1000mm), 2x on X-axis (800mm) and 2x on Z-axis (400mm)
• 1610 ball screws, 2x on Y-axis (1000mm), 2x on X-axis (800mm) and 1x on Z-axis (400mm).

The frame I have decided to build with aluminium profiles. In my country there is a company called Movetec, selling aluminium profiles (MiniTec Profile Systems). They have 45 series profiles which I am interested in but they are rather expensive, compared to 40 series profiles from Ebay Germany. The 45 series profiles looks very robust and they are also offering fastening solution called MiniTec Power-lock. This solution requires zero drilling/preparation of the profiles. This is the reason why am I am having a hard time deciding which profiles to go for, since they do not offer this fastening solutions for 40 series profiles. The cross sections of each profile can be seen in the attached pictures.

MiniTec Prices:

• 90 x 90 S: 110$/meter (MiniTec)
• 90 x 180 S: 200$/meter (MiniTec)
• MiniTec Power-Lock: 5$/qty
• 90 x 90 L: Did not ask the price for these but I can imagine I could save a few $ compared to 90 x 90 S.

Ebay Germany Prices:

• 80 x 80 L: 50$/meter (Ebay Germany)
• 80 x 160 L: 100$/meter (Ebay Germany)
• Fastener for 40 series: 5$/qty (Ebay Germany)

What do you guys think? Is it overkill to go with the 45 series profiles only because of the fastening solution? Are those profiles significantly better than 40 series profiles? Also advice on component selection is very welcome. I can provide picture of the 3D design (done in Siemens NX) later this week.

There is also a poll for 40 series and 45 series for you to cast a vote on!

Best regards,
NordicCNC