Rack/Leadscrew Video The router is loud. Check
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The bit is 1/2 inch diameter, and the cuts are 1/2 inch deep; the feedrate is 100 inches per minute. Video compression causes the movement to appear uneven; however, the router is moving smoothly and the quality of cut is good. The vibrato-tremelo sound of the bit carving the wood indicates that the speed is approaching its upper limits at this depth and width of cut. Cutting across the grain adds extra loads that cause chatter. The version of the machine used for this video has an aluminum gantry and carriage. It uses racks and pinions on the long table bed axis, and 3/8 inch 5 turn per inch Acme leadscrews with Delrin anti-backlash nuts on the gantry and Z axes. These plastic leadnuts can contribute to chatter, since they are flexible. The machine is powered by the HobbyCNC 305 oz.in. kit. Xylotex systems performed similarly. The machine used around $700 in materials, not including the HobbyCNC components and router. |