A year ago, I built a JGRO CNC Router, powered by a Hobby CNC Pro Card and 305 oz/in Unipolar Steppers, Power source are a 24VAC 10A transformer that gives me 34vdc. Hobby CNC controller can take 42vdc.
CNC Controller at 1/8 Microstepping.
The transmission are ½” 13TPI, Single Start Threated bar (Non ACME) .Configuration speed is 1000mm/min (aprox 40 IPM) for all axis. I can get that speed in rapids and in a Linear cuts along the axis , but when the cuts arn’t linear to the axis, the speed decreases at 200-300mm/min ( 7-15 IPM). For example, cutting pieces for dino’s schelettons, circles, ecc.
The PC are an old Asus P4D533 Motherboard with a 1.8Ghz P4 CPU, and 1Gba of RAM.
The MACH 3, Kernell speed are 35000 GHZ, but the PC only arrives at 33800Ghz.
What do you supposed that are the cause of that,,? Is normal??, Can I fix it in any way?
Excuse me my bad english, I hope you understand.
Thanks in advance for your answers,
Also I attach a file that had the problem.