Remix Hectorrail 141 locomotive for OS-Railway with a 260 motor.

thingiverse

This thing is a remix of https://www.thingiverse.com/thing:2575667 Hectorrail 141 for a cheap 260 motor (3-6V 7000 rpm). This thing has the following changes compared to the original: Chassis: - Other hole for the 260 motor - A bigger hole for a 18650 battery holder - Extra holes for a switch holder - Extra holes to attach ballast holders Body: - A bigger hole for a 18650 battery holder (2 batteries) - A hole to guide the wires from battery holder to electronics - A container on top of the battery for the electronics Transmission: - Other transmission with worm wheels Problem with this type of transmission is the high rpm. When the rpm becamer too high, because of friction the gears became too hot. When the gears became too hot they will soften. I used Lithium grease to have less friction. Bogies: 2 Ugly bogies (sorry), of which one of them has to hold the 260 motor. Wheels: Some bigger wheels New components compared to the original: - Wheel motor grip (should be printed with TPU filament). - A switch holder for a MTS102 miniature toggle switch - 2 Ballast holders, I filled them with some led. Software: 1. Standard the pwm frequency for the ESP8266 is 1 kHz. This is far too high for a 260 motor. The result is that you have too little torgue at low speeds, so the locomotive will only run at high speeds. To solve this problem you have to lower the PWM frequency by adding the following statement in the init: analogWriteFreq(512); // sets the pwm frequency to 512 Hz 2. The maximum speed in the webserver is lowered to prevent softening gears.