Working Railway Turntable N Scale 1:160 - Hand Crank, 12-Position Detent

Free N scale 1:160 version of a working railway turntable. A key crank turns a 12-tooth pinion that drives a 102-tooth ring gear under the bridge (8.5 crank turns for a full circle). The ring has 12 V-notches, one every 30 degrees, and a flat-printed flexure arm clicks into them so the bridge stops at each track position.

WHAT IS IN THE DOWNLOAD

• 14 STL files for N 1:160: pit, centre post, bearing cap, two girders, deck with rails, hub, drive ring, pinion, flexure arm, key crank and knob, six approach stubs and a fit test coupon. The bridge is about 105 mm long in a pit of about 118 x 124 mm.

PRINT NOTES

• The whole set was slice-checked in PrusaSlicer (0.4 mm nozzle, 0.2 mm layers): no failed parts and no supports needed; the arm and the crank knob use a brim. About 126 g by the slicer estimate.

• - The moving parts were checked in a simulation (bridge turned 360 degrees in 0.5 degree steps, no interference, 0.3 mm running clearance). Print the fit test coupon first.

• - Known limits: the crank is a removable key crank (the bridge ends pass over the crank position), and the detent click is light, about 2 N.mm by my estimate at H0; the flexure arm base is glued in its wall socket.

• - The model has not been test-printed yet. The images are renders, not photos; the loco, shed and grass in the images are not part of the files.

WANT MORE?

The complete set with the H0 1:87 scale and the multicolour 3MF files is on Cults3D: https://cults3d.com/en/3d-model/game/working-railway-turntable-model-hand-crank-12-position-detent-h0-1-87-n-1

LICENCE

Free for personal use under CC BY-NC. Please credit the author and do not sell prints or files.

Designed with AI-assisted 3D tools and checked by the author.