Tester's Tandem

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  • I assume it must be something similar to properties with inventor

    Yeah, there's a properties dialogue if you right click on a component, must have been added since I last looked as there was some weird method of measuring volume on the F360 forum. It picks up the material and assigns a density, so I don't even have to do any calculations: 1707g as currently drawn

  • It's quite fun watching fusion develop as people rage in the forum. For the price (free) it's such a banging bit of kit.

  • Maybe I should rage on the forum and see if I can get them to add volume/mass to the Measure dialogue box when you select a body or component, that would be the sensible place for it as that's where you get a length when you select an edge or an area when you select a face.

  • I doubt it. I was at the Autodesk conference in December. The developers told me that the 'mega' version of fusion is a product called speed form, which will be available to the automotive industry. Basically it is a port of a parametric modelling tool for revit (architecture) called Dynamo. Dynamo has all the Autodesk API libraries so a user can basically hack the functionality of any base platform to extract and manipulate data. So in a nutshell, you'll be able to access the mass data yourself, which is kind of cool http://dynamobim.org

  • are you running static FEA on those forks?

    Just had a go, loading the axle to simulate a 1g stop


    1 Attachment

    • Fork for analysis v1.jpg
  • What is it showing? FOS?

  • FOS?

    Yes, note I just edited to change material from non-specific steel to 4130, so it looks much safer now.

  • Looks much better indeed. I did not expect the trailing edge of the crown to be under that much compression / that close to its max.

  • Today I have been mostly simulating a test rig which actually applies loads where they really occur on a bicycle.


    2 Attachments

    • Fork v4.jpg
    • Fork analysis v4.jpg
  • Wouldn't the force be other way round? Or will you be riding it backwards?

  • Applied brake, I think.

  • Ah yes, of course. Wheels are round.

  • Applied brake

    Quite a lot of applied brake, the reactions normal to and parallel to the ground are set at 3000N each, so ~300kg all-up mass being braked so hard that the back wheel has started to come off the ground, and the driver is being supported almost entirely by the handlebar. There is also a bit of side load at the tyre contact point to represent the fact that this panic braking is happening as the driver heads with alarming rapidity towards the hedge/kerb/armco/whatever else he wants to miss on the outside of the corner :-)

  • great work! However I do wonder if the assumption of 300kg might be too great a force for hubs/rims/spokes to adsorb!

  • If the wheel breaks before the fork, my job is done :-)

  • How's this coming along?

  • How's this coming along?

    Nothing to report. I think the next thing to get made will be the chainring.

  • has this been resolved yet, id quite like to see the state of the beast if im going to be dragged around on it!

  • if im going to be dragged around on it

    You're not getting dragged around, you're pushing me. Think wheelbarrow rather than horse and cart.

    This is the last time it was out, nothing has changed since then

  • i was being modest.... ;)

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Tester's Tandem

Posted by Avatar for gbj_tester @gbj_tester

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