The length of the lead screw only needs to be sufficient for the travel distance plus any structural and nut positioning requirements. It's generally unimportant if it extends beyond that point, as long as it provides the desired travel for the axis. On average, my 2D designs take around 35-40 minutes to complete. Lead Screw Link: [15-5-Starts-10-TPI](link) Antibacklash Nut Link: [15-5-Starts-10-TPI](link) I built a 2' x 4' CNC machine about two years ago using plans and parts purchased through this website. The 5-start 1/2" lead screws I used will travel one inch with only two turns of the motor, resulting in significantly more torque at low speeds. In contrast, a standard all-thread lead screw would require 13 turns to achieve the same distance. The faster feed rate and jogging speed are due to the lead screw's ability to travel farther for each turn of the motor. This allows for increased travel and cutting speeds up to 200-300 IPM (inches per minute). By switching from a standard all-thread lead screw to a 10 TPI 5-start Lead Screw with antibacklash nuts, you can increase your speed and achieve faster results.
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