Troubleshooting Discuss any issues and potential fixes for your machine. For a complete troubleshooting guide, visit http://www.langmuirsystems.com/troubleshooting. Tips and Tricks A place to discuss helpful Tips & Tricks for cutting on the CrossFire. General Discussion General Discussion about the CrossFire CNC Plasma Table. Assembly A place to discuss your experiences with assembling the CrossFire CNC Plasma Machine. Visit http://www.langmuirsystems.com/user-guide for complete Assembly Instructions.