TF Makers

[forteh]

1 hour ago, Topsy said:

One part of me is most surprised that this worked out cheaper. Looks brilliant!

Only cheaper because I have a tame CNC operator at work and we're not massively busy in the factory at the moment

[Topsy]

Okay, that's a very nice thing to have. 

[J.KYDD]

Made a Pizza table/grill station for the Ooni oven & BBQ. 

[Tom Booth]

Ooni ovens are the best/worst thing to happen to my waist band

[aener]

I made a thing.

[monkeyseemonkeydo]

2 year bump! Been meaning to do this for ages but could never think of a good way to do it. Anyway, 50% scale motorbike model (spine for now) to start working on crazy aero bits that are popping up in MotoGP.

Design done in Solidworks. Most of the spine is waterjet cut with telescoping, IGUS bushed, forks and 3D printed wheels (done in two halves each) on our Creality CR-M4 large format printer. The bit at the top is a 6-component balance and beneath that is a little roll system to allow the model to be cranked over to +/- 60 degrees, in 5 degree increments, for cornering cases.

 

[forteh]

Does the steering angle not need to be taken into account?

[monkeyseemonkeydo]

19 hours ago, forteh said:

Does the steering angle not need to be taken into account?

In theory maybe but in practice I don't think it's critical and can be introduced later if necessary. At racing speeds I think the actual steering angles they achieve are quite small and for what we're looking at the lean angle is the critical thing. There's going to be a steep learning curve to work out what the hell the forces actually mean though as everything's on the piss relative to everything else and there needs to be a fair amount of translation and taring off offsets etc.

[forteh]

Then you have to factor in countersteering whilst backing it in?

[monkeyseemonkeydo]

1 hour ago, forteh said:

Then you have to factor in countersteering whilst backing it in?

Already thinking that we may need to model a rider hanging his leg out under braking... going to be an interesting project!

[forteh]

15 minutes ago, monkeyseemonkeydo said:

Already thinking that we may need to model a rider hanging his leg out under braking... going to be an interesting project!

Steel frame maquette with a stuffed textile covering, allow you to play with different body positions?  Screws up your spine design though, perhaps you could have a rolling chassis mounted forwards of the spine on a spar to give uninterrupted airflow over the bodywork/rider?

edit: you could 3D print the rider in limb sections and then incorporate that into the maquette

Edited July 3 by forteh

[manuel]

Might sound like a stoopid question but do those bits hanging down to the model get faired? I know they are consistent but a fairly hideous shape? I’d have thought it was more ideal to have them be more aero neutral shapes?

edit- like wouldn’t airflow off that potentially directly interact with the crazy bits on the back of the bike behind the seat? 

[monkeyseemonkeydo]

30 minutes ago, manuel said:

Might sound like a stoopid question but do those bits hanging down to the model get faired? I know they are consistent but a fairly hideous shape? I’d have thought it was more ideal to have them be more aero neutral shapes?

edit- like wouldn’t airflow off that potentially directly interact with the crazy bits on the back of the bike behind the seat? 

Yeah, everything from the balance (last dark bit before the shiny ally) is effectively 'live' so will have an aero 'teardrop' around the balance itself and then all of the sting bits that lead down to the bike. There'll obviously be a rider model sitting on the bike so only about half of the sting will be exposed. I've got a second set of the stings made so I can chop them off at a relevant point, replicate the fairing and use that for 'tare' values of the support so that only the aero loads of the bike and rider can be extracted from the data.

Also yes, but then the rider being present means that in my mind they can only do so much most of the time. Hopefully will still get something useful from it!

 

[manuel]

presumably that's a rolling road ? How do you generate Yaw/wind angles/whatever you wanna call it? 

[monkeyseemonkeydo]

10 hours ago, manuel said:

presumably that's a rolling road ? How do you generate Yaw/wind angles/whatever you wanna call it? 

Yes, rolling road so rotating wheels/correct aero for ground effect. The overhead balance that this setup attaches to is on a 'slew ring' so we can yaw the whole assembly in the tunnel to replicate sidewind conditions and yaw angles for aircraft etc. The road itself has a mechanism that can allow it to yaw relative to the tunnel (from the days when we used to work with Penske and they needed to work on oval racing stuff) but it hasn't been done for years and our current boundary layer suction box, side panels etc. don't allow for it.