Points motor for Piko/LGB G Scale

thingiverse

This is a redesign of my "Improved points". It moves the drive rack from above" to "under" the points. This removes an issue with the previous design and some Locos where a low part would interfere with the drive rack. https://youtu.be/uy5wnefGO_E I have also revised the drive rack and gear to Mod 1. The Rack MUST be printed "on its side" for strength. The Indicator assembly has also been revised and simplified so it now has just four parts, and now has an adjustable position to help align it. It is ESSENTIAL that the "Ind_drive_body" cylinder be cleaned and any "elephants feet" from printing cleaned off. The sides, top and bottom should be filed to clean and help the part move smoothly. This Part MUST be printed with supports to keep the drive feature correct. There are a number of different indicators in the "alternative indicators" STL, The French style indicators have Opaque and "Transparent" STL to allow testing of two colour prints. You will need four M3 r*4mm long round-head screws for the Indicator. The main drive lid is held down by M3 (or #4) countersunk screws of ~5mm. To hold the motor to the rack, I use M3*8mm round-heads. All screws should be stainless steel. I recommend using the 9018 Metal gear servo, But the screws supplied with the servos are too short to hold the drive gear so you will need a longer M2 screw to fit the drive gear. I use M2 pan head by 8mm. When assembling, set the servo to "mid" and fix the drive gear so that the main pins face "down". Fi the body to the track and fit the drive rack. Then place the points in "mid" position and slot in the servo. The rack will move slightly one way or the other. The photos show the rack in this "middle" position. Once the main drive is assembled and the lid fitted, the indicator can be added. Assemble the Indicator drive body to the Motor drive and fix with the two M3 roundheads. They are in slots to allow a small amount of play.. Move the servo so that the points tracks are as near as possible in in the Mid position. The "upwards part of the drive rack should be exactly in the middle of the circular indicator drive hole. If it is not, move the Indicator body slightly to adjust. Place the Cylindrical Indicator drive part in the Indicator body, taking care it is aligned with the Rack drive pin. Fit the Indicator lid and test the motion. The indicator drive should rotate freely and not cause any "stoppage". Finally, fit the indicator on the top of the Indicator assembly. I use Rockrail and drive these with my own DIY "WiRocs" ESP 8266 based wireless control system (https://wiki.rocrail.net/doku.php?id=users:dagnall53:description). Each WiRocs Esp8266 can work 8 I/O mixing sensors and servos. The WiRocs boards fit in my "Ticket Office" https://www.thingiverse.com/thing:2079062 There are also "extended" and "super extended" versions of the main body, to make room for a DCC decoders such as these below, but please note I have not tried these nor am I connected to the companies.. Please message me if you try these and let me know if there are problems.. https://www.digital-bahn.de/shop/product_info.php?products_id=88 16 mm x 29 mm https://shop.md-electronics.de/digitaltechnik/funktionsdecoder/swd-ed-servodecoder-mit-servo-funktionstaste-f0-f28-oder-weichenadresse-schaltbar-nachwippen-fahrreglersteuerung-glockenschwingen 15 mm x 33 mm