DIY CNC mill - All Aluminum frame - My first steel milling experience - A bumpy road

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Link to my 3D CAD design of this machine:
grabcad.com/li...
I continued in this video the process of enforcing the frame of my home built CNC. I had a little hiccup with the over-heating of the stepper motor driver DM542 running at max current output. After the issue occurred, I reduced the current output and thing ran smoothly as expected.
To recover from the problem, I used a mach3 script to find the center of one of the hole and use it as X and Y zero reference and continue the 2D contour tool-path without any problem.
After replacing all the brackets and gantry plates with Aluminum parts, the machine became very sturdy, I couldn't feel any loose movements or play in any direction.
I tried a steel milling at the end but failed. The bits became dull very quickly even with water coolant mist spray to the bit while cutting. This partly due to the high speed of the spindle that I have and also the bits that I used weren't suitable for steel milling.
But the machine can cut Aluminum very smoothly. I milled a small 3D relief model with a lot of small details and the results came out great. I barely see all the cutting line created by the parallel tool-path.
Here's the link to the tutorial on center finding script and other useful script for Mach3:
• CNC Mach3 | Automated ...