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  1. H

    dynamo on a bike

    Connect the Dynamo directly to a motor. Spin the wheel. It'll always stop - because every mm of wire, every connection and every rotation of the motor and dyno creates losses. Perpetual motion can't happen, the power has to come from somewhere. The increased drag from the Dynamo being there...
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    Any engineering geeks? 3d printed frame

    Probably, all comes down to setup. Mine was an off the shelf cr10s once (now it has 6 friends). Most of my prints are functional so 30-40mm/s with minimized layer lines and ringing was my goal (was doing a lot of engineered test samples, they don't like that wavy wall issue so slower, more...
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    Any engineering geeks? 3d printed frame

    Guess that depends on your slicer and jerk settings. I've got the heavy Titan aero with volcano and fullsize not pancake stepper. I'm way faster printing walls than infill - direction changes are evil. That's why I run a big nozzle on most prints - single wall big layers. No infill. As soon as...
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    Any engineering geeks? 3d printed frame

    The cf-petg we have here is much stiffer than standard petg. And it's a lot stronger than PLA. Varies by manufacturer. The last thing I put together with long arms like your laptop stand I was able to half the arm diameters by adding holes down the length on the horizontal axis. Took more than...
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    Any engineering geeks? 3d printed frame

    PETG anneals, perhaps the chemical process is different than PLA but there's definitely benefit (but also a higher temp needed 150° vs 120ish). There's parts I print regularly that are definitely stronger after, and supports break away cleanly after annealing. I ran these with a 1mm nozzle, so...
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    Any engineering geeks? 3d printed frame

    Wouldn't say not possible. https://www.fabbaloo.com/blog/2019/7/24/basf-launches-steel-filament-ultrafuse-316l FDM printed then sintered in a kiln - true 316 stainless. By basf no less, with proper engineering data. The new material options are interesting - like that markforged that lays in...
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    Any engineering geeks? 3d printed frame

    I was curious if I could build something to support my own weight. Semi sketched out as a center section of a kick scooter add fork mount to one side swingarm to other (simplified pretty sure I'd need to bring the swingarm support back a ways). 500mmx 200mm center section, if I could support my...
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    Any engineering geeks? 3d printed frame

    I was bored yesterday, old roll of carbon impregnated petg was screaming use me. So v1 was 323g of material. 3mm square tubes 75mm tall 'joist', that's a 10mm arch on 500mm span. (8mm arrow shafts for interconnection at center). Not shown outer walls were included at .25mm Printed with 1mm...
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    Frame parts and design

    https://www.amazon.com/Carlisle-Straight-Lawn-Garden-Tire/dp/B005O5UO3E Not so square shoulders. Yeah the steer turf version - I'll just add sipes / may add studs ala redneck ice racing (6-8mm screws) - for the front tire (front drive). Looks and scales about right for a few of the big tire...
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    Frame parts and design

    Hey all, Wondering if you guys can point me in the right directions. My 2nd gio Italia is dieing, after reviewing options... Pretty much if it's legal as an ebike here (500w, 32km/h speed limited, and assist pedals) and in step through scooter/moped design (I have bad and unstable knees) I...
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