07jkearney

That looks fantastic , be proud of what you have achieved.

The middle part is structurally sound, the vertical play originates from the turntable parts. The solution to this is to link the extreme ends of the chassis to the middle section. But thanks for the advice :)

So, having been a 'lurker' on this forum for some time, I thought I'd make a thread to share upcoming MOCs, and to gain insight into design problems from an amazing community. Expect infrequent updates of zany incomplete MOCs, which usually end in failure , but I have fun, and I hope you will enjoy following my projects. All MOCs that I have built up until this point in time are displayed in videos on my YouTube channel, so have a look if you feel like it. I will kick off this thread with a project that I have been working on recently, a crawler with a suspension design based around these turntables: It has 4 wheel drive and is propelled by one XL motor, with drive transferred through the turntable using a differential. and through a 2 speed manual gearbox, the steering is done by a medium motor. The two gear ratios are 1:5 and 1:8.34 As you can see, the chassis flexes substantially due to the suspension design But it goes, and has good crawling abilities due to large suspension travel: Its main flaws are torsion of the main body section due to the suspension not being stabilized, and the gearbox disengaging under high torque. If I built it again I would leave out the gearbox and brace the suspension from both ends. Below is a video showing it in action: http://www.youtube.com/watch?v=zuKj1Bs-SB4 More pictures on brickshelf Comment what you think, and feel free to ask questions or request any additional photos More WIP MOCs to come in time

2 pumps will provide greater airflow, and so make the cylinders work faster. But one pump would also work, albeit not as fast.

Looking good

I would love to come and meet with you Blakbird, shame that Birmingham is such a long drive from Devon

I think this part will be useful in creating a half stud offset, which could come in especially handy when designing bracing for changeover catches:

Happy New Year!

I would have defined my setup more as using Mindstorms elements with power functions rather than "Power Functions with the MINDSTORMS NXT" But thanks for the fast answer, do you think the motor would respond to commands from the speed remote?

Today I wired up a mindstorms nxt motor to a Power Functions IR Receiver; but was concerned for the health of the motor and wondered if anyone could verify the safety of the setup. Above are the components I used, from left to right; A standard battery box loaded with rechargeable batteries, a power functions extension wire, a conversion wire for using old RCX sensors with the newer mindstorms set, an IR receiver V1, I also used an NXT motor (not pictured). Below is how I set it all up: The NXT motor responded to commands exactly as a power functions motor would, when receiving commands from the standard remote, rotating both forwards and backwards. I only tested it for a few seconds as I didn't want to risk damaging any components. The two questions I wondered if anyone could answer are: 1) Is it safe; will I damage any of my parts by doing this? 2) If yes, can someone test its response to the speed control remote? (I sadly so not own it) Many thanks, and look out for my upcoming MOCs thread, 07jkearney

This is amazing work efferman, truly inspirational

No that sensor can only send commands to the IR recievers, the one that you are looking for is the IRReciever sensor: http://www.hitechnic.com/cgi-bin/commerce.cgi?preadd=action&key=NIR1032

That is beautiful, be sure to enter it in the technic challenge

Wow, I always shunned the older technic sets for some reason, but this review has sparked an interest , thanks.

Seconded, that orange bike's tires

This is a great review of a great book, good work. Technic for teh win

Loving the book so far Sariel, simple explanations and diagrams make tricky concepts easy to understand, Good idea also to include instructions, these are great!

Sweet car!

Here are some excellent photos of Paul (Sariel) 's workbench;

Fantastic! Really tiny. :thumbup:

Amazing as always Sariel, it is fantastic to see a highly functional model that also looks great. Nice work. As for the hamster:

It's not quite finished, but a video will appear at the link below in the next few days.

Thanks, sorry about the pictures.

I have been working on this for the last few days as I am interested in the steering and drive system of dodgems; requiring one or two pivoted and driven wheels at the front of the chassis, below is my solution to this, using a turntable: http://www.brickshelf.com/gallery/07jkearney/Bumper-Car/sam_0417.jpg And the top view, showing the knob wheels used for the drive: http://www.brickshelf.com/gallery/07jkearney/Bumper-Car/sam_0414.jpg The two clearly visible Medium motors are for drive, and the obscured topmost one steers the wheels via a worm gear. Finally, here is a photo of the car as it is now, with bodywork almost completed: http://www.brickshelf.com/gallery/07jkearney/Bumper-Car/sam_0419.jpg Please comment with questions and suggestions. More (smaller) pictures to come.