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bez

High speed RC project

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Thanks @Bez! Good read, sorry to hear your tire resulted in such a drawback! You printed it in PLA right? Did you also consider printing it in TPU? Or Nylon?

We now support a couple of materials which can withstand more wear and tear than PLA, perhaps something you could consider some day.

And even bending a 8mm axle, wow. Do you know how fast it was going at the time?

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Hi Sander,

Its very much the nature of the beast when trying something new, a few setbacks here and there is very much a part of a project like this. After all if it was easy it would be boring ;)

The worst thing was the accident happened at very low speed but as a result of a traction loss and the wheels just span up and the tyres let go :( But on the bright side its better then it happening at high speed and the car smashing into many many small pieces.

The biggest issue I have with materials is finding something that can produce a high quality finish and consistent performance over a long time as most of the parts for the car take well over 28hrs to print even with using one of the awesome 0.8mm nozzles from the Olsson kit. Although Looking at the new Ultimaker 3 it looks like the design and the addition of the duel extrusion might open up interesting possibilities, I'll have to be really really nice to the wife and see what I can get away with in the new year.

I have some interesting ideas on increasing the strength of the design while making sure I keep as close to my design brief as possible. The next plan for the axle will involve a hollow 12mm axle which is commonly used on 1:8 Scale RC Pan cars. I will probably go back to using foam tyres also as they don't seem to make as much of a mess when they fail lol

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Hi Bez,

Its true that not everything should be 3D printed. Perhaps a special grip texture could be developed for your tired, but only if the materials works of course. If PLA breaks and foam works, that is probably the better way to go.

I think the Ultimaker 3 could offer you a lot, especially with the dissolvable material you have much more freedom in the parts you want to design. For now, there is no 0.8mm nozzle available though (since you said it is what you used most).

Thanks for the update!

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Hi Sander,

Yeah I agree with you there. It might be the axle carriers will end up being milled. The rest of the chassis has proven to be pretty decent it might mean adding a reinforced alloy plate under the axle carriers to just help with the extra forces at play when things don't go to plan.

Its a shame the UM3 is only 0.4 at the moment but after all the UM2 was 0.4 until Mr.Olsson designed his extremely handy kit. However if the reliability and consistency of the printer has improved the extra time taken to print parts might not actually be soo bad :)

At the moment the design has static suspension which isn't entirely ideal. So I need to have a play about with some designs, the front end is particularly tricky as the wheels are internal to the body which leaves very limited space for the steering servo and control arms. As it is with these things its always a bit of trial and error.

I will dig about my photos I took while I was assembling the car and post them here later as its always nice to see whats under the hood so to speak :)

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Here are a few "build" pics of the car if anyone is interested.

First up are the obligatory Finished print pics of a couple of the larger parts I know there not exactly exciting but when you have to leave the print going for over 27hrs its always nice to know its in the safe hands of the Ultimaker :)

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The following pics cover the rear end and its setup. I moved from the origional Mod1 spur and pinion design as I found in V3 the motor and rear axle were a tad too close so I wanted to trial a belt design, I opted for a 16mm Belt and pully system this might be a tad over kill so I think I might give a 10mm option a whirl next.

20160909_234734_resized.thumb.jpg.d29b4ddcb1458f4a377ae1faac0f4111.jpg

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Lastly here are a couple of pics showing the steering assembly which is in need to a re design but it did the job and had a very similar turning circle compared to V3.

20160916_001834.thumb.jpg.73d423f0c78b4a660f89f57e480a54d6.jpg

20160916_232844.thumb.jpg.0b4259a437acc528adca27c4d720a691.jpg

20160909_133242.thumb.jpg.76d90a83b868d6ddaf1c11d315978b65.jpg

20160909_220000.thumb.jpg.3b929c800537bbfabede33cad672f969.jpg

20160913_230603.thumb.jpg.b6d35d738079e1105fb585ffe51afdda.jpg

20160909_234734_resized.thumb.jpg.d29b4ddcb1458f4a377ae1faac0f4111.jpg

20160914_142744.thumb.jpg.c1354a6506d39a53451eb20dc9b4d929.jpg

20160915_113227.thumb.jpg.e32499518ef8d3d72f19564b16d7b43f.jpg

20160916_001834.thumb.jpg.73d423f0c78b4a660f89f57e480a54d6.jpg

20160916_232844.thumb.jpg.0b4259a437acc528adca27c4d720a691.jpg

Edited by Guest
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Hi Sander,

Yeah I agree with you there. It might be the axle carriers will end up being milled. The rest of the chassis has proven to be pretty decent it might mean adding a reinforced alloy plate under the axle carriers to just help with the extra forces at play when things don't go to plan.

Its a shame the UM3 is only 0.4 at the moment but after all the UM2 was 0.4 until Mr.Olsson designed his extremely handy kit. However if the reliability and consistency of the printer has improved the extra time taken to print parts might not actually be soo bad :)

At the moment the design has static suspension which isn't entirely ideal. So I need to have a play about with some designs, the front end is particularly tricky as the wheels are internal to the body which leaves very limited space for the steering servo and control arms. As it is with these things its always a bit of trial and error.

I will dig about my photos I took while I was assembling the car and post them here  later as its always nice to see whats under the hood so to speak :)

 

Well, this was at launch. The concept of the Ultimaker 3 with easy swappable print cores and build for reliability is that there are different print cores for different materials, or nozzle sizes. With matching print profiles. So a 0.8mm print core (/nozzle) will come!

Looking forward seeing the photo's!!

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