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@simon_brooke@mastodon.scot
2025-09-04 12:22:46

Two more blog posts on the #Tricycle project over the last few days: firstly, I have found a CAD tool that works for me:
journeyman.cc/blog/posts-outpu

Drawing the tricycle
I have, as I wrote in my last post, real difficulty with learning 3d modelling software. Every system I've tried has a really steep learning curve, the commercial systems are extremely expensive making them very hard for me to evaluate, and some of my cognitive quirks just get triggered when trying to use them.

@simon_brooke@mastodon.scot
2025-09-05 11:20:45

CAD model of the #tricycle subframe. The chain ring is very nearly as big as the front wheel (80 teeth!). It drives an epicyclic gearbox mounted in the nose of the vehicle, which also has a disc brake. The epicyclic will drive a secondary chain via a sprocket mounted to the left hand spoke flange, but this is not yet shown. There will be no ratchet on the secondary chain, so the disk brake on the…

A CAD visualisation as described in the body of the post. Most of the structure is coloured grey, to represent aluminium tubes. The cranks and pedals, and the tyre on the wheel, are coloured black. The epicyclic body is coloured red to represent a Rohloff, although for budgetary reasons it will probably end up being a Shimano Nexus 11.
@simon_brooke@mastodon.scot
2025-08-27 06:48:16

Having not written anything about my #tricycle project in months, I've now written two posts in two days. Here's the first:
#BikeTooter
Rethinking the tricycle drive train

Rethinking the tricycle drive train
I've been rereading my posts on design of a tricycle, and especially this one; and I've been looking again at this picture, of Seventy Seven's removable front subframe which carries its front wheel, steering, and transmission systems; and I've been thinking. This will be a short post documenting my thoughts.