|
Sportsman + 3D print: Lil Doggy So I had a spare AR60 axle and a set of HB Rovers waiting for a long time to be used, and lately got into 3D printing, so I decided to embark myself to build a Shafty/Sporty/Sportsman (or whatever you call it) Comp Crawler. My approach is to 3D print whatever is possible and go the DIY route as much as possible. Why? Because is fun as hell, and love to be able to change my rigs the way I want as much as possible. So, I started researching for chassis options and look all the high-end brands and also found one in Thingiverse.com. I think the cleanest and overall best chassis available out there is the Succer Punch (from 5th Dimension), so I took the thingiverse chassis from here (https://www.thingiverse.com/thing:4337575) and took some inspiration from the Succer Punch to design my own. https://uploads.tapatalk-cdn.com/202...fd05f95f42.jpg After ~5 design iterations this is what I ended with: https://uploads.tapatalk-cdn.com/202...fa54d26fa2.jpg https://uploads.tapatalk-cdn.com/202...32c563e661.jpg I call it the Lil Doggy. Got some parts to complete my build where I thought DIY was not viable: * HR locked transmission * Vanquish steering link * Axial Hardline Body * Que-T steel axle tube for AR60 * Dlux AR60 Truss Sporty Version * Axial AR44 axle set (for rear) * Crawler Innovation narrow foams * Injora in-spring shocks * Team Associated 16T 5-Slot motor * HW 1080 esc * Hitec D954SW servo * Steering Knuckle s Weight from ebay * For links I used spare traxxas ones plus built my owns |
Re: Sportsman + 3D print While waiting for more parts to come, I had the first version of the chassis put together to see how it looks. https://uploads.tapatalk-cdn.com/202...943f70bd31.jpg In this version, I had some issues on the links hitting the chassis and reducing articulation. Also realized that would be good to raise the upper arms mounting point in the rear AR44 axle. |
Re: Sportsman + 3D print Designed a upper arm mounting for the AR44 axles. https://uploads.tapatalk-cdn.com/202...ab227c8506.jpg Had like ~4 iterations to nail this one. Liked the result. https://uploads.tapatalk-cdn.com/202...6969ee23ab.jpg https://uploads.tapatalk-cdn.com/202...312d46f99a.jpg Finally, got the shocks, motor, esc in, so I put everything together for the first time. Used momentarily standard AR60 knuckles and some old wheels. https://uploads.tapatalk-cdn.com/202...da7a15c3ad.jpg https://uploads.tapatalk-cdn.com/202...320ac1b995.jpg |
Re: Sportsman + 3D print Got the knuckles with weight - they look great and feel way better quality than expected. https://uploads.tapatalk-cdn.com/202...88645c5bfb.jpg https://uploads.tapatalk-cdn.com/202...c9cc81a1a5.jpg I printed my final chassis version and replaced. This one is fixing clearance issues with links and adding some more mounting points to add cross members and have more room for link tuning. https://uploads.tapatalk-cdn.com/202...ae111d8a56.jpg |
Re: Sportsman + 3D print Next: wheels. Started designing several wheel types and shapes. Wanted easy glue-on wheels and the option to add weight slugs too. Also not sure which width I'll go with yet, so designed wheel spacers of different sizes. https://uploads.tapatalk-cdn.com/202...19730d9003.jpg Works. https://uploads.tapatalk-cdn.com/202...634275d0cc.jpg Then started to design a weight add-on holder. https://uploads.tapatalk-cdn.com/202...4084c01d6c.jpg Made holes for a standard 1/4" tube that you can find in home depot. Bought a Zinc Plated 1/4" tube and cut it in small 15mm pieces long. |
Re: Sportsman + 3D print And this is how the weight add-on look. Again, went through like 4 design iterations to get it as small as possible. https://uploads.tapatalk-cdn.com/202...420b49accc.jpg https://uploads.tapatalk-cdn.com/202...0b29657786.jpg Also had to design a wheel where these would fit. So started designing an glue-on inner ring wheel. https://uploads.tapatalk-cdn.com/202...86a37d453c.jpg It's coming along.. the add-on weight have a great fit on the knuckles. https://uploads.tapatalk-cdn.com/202...e31675f6cb.jpg And the wheels fit with enough room for wiggle, so should work... https://uploads.tapatalk-cdn.com/202...aae59b1233.jpg This is how the overall rig is looking at this point https://uploads.tapatalk-cdn.com/202...b7b0e5b8b2.jpg |
Re: Sportsman + 3D print: "Lil Doggy" CI Foams came in today! (At last!) Mounted the rear wheels and look great. The spacers in the rear wheels are .750" and with the 6.0 Narrow Comp Cut the HB tire is now a bit taller and thinner, just how I wanted. https://uploads.tapatalk-cdn.com/202...e4a280f27c.jpg In the front wheels I'm looking to try 0.500" spacers, so even thinner. Plus the internal ring mount system, I'll need to do some good trimming before mounting, to make it thinner and make space for the inner ring with bigger radius. Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: "Lil Doggy" Getting to the "point of no return" now... Ready to trim the front foams. https://uploads.tapatalk-cdn.com/202...43a6527f70.jpg https://uploads.tapatalk-cdn.com/202...763c8e9ccb.jpg https://uploads.tapatalk-cdn.com/202...c91ef40b7e.jpg Right wheel is 0.5" width and left is 0.75". Hard to see in the picture, but the thinner (right one) one is taller. Wheels are done! Waiting for the glue to completely dry to test this thing! https://uploads.tapatalk-cdn.com/202...2a6da0751e.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: "Lil Doggy" I love it, this looks like an awesome project. I was planning to work up some slug holders pretty soon. Did you just make it a snug fit or are you gluing the slugs in place? For cutting down foams I've designed a few 3d printed jigs that I stuff the foams into and cut them with a fine toothed hand saw. The hand saw does pretty well with the firmer foams, it only struggles with the soft outers but it'll do the job. If you have any strength issues with the rear axle upper link extension you could try to re-print or redesign it so it (the upper portion) can be printed horizontally on the print bed, you get more strength from parts and holes that way. You could split the main mount portion from the side supports so they can be printed in the strongest orientation then joined with either CA or screws. Sorry if this comes off preachy or something that was just what popped into my tinkerer head. |
Re: Sportsman + 3D print: "Lil Doggy" Thanks for the tips Humbold, we'll see how it holds! And yes, I could make it beefer, but so far this PETG has been really strong. I'm more worried about the wheels to be honest, but we'll see! About the weight holder, is printed in such a way that the weight cilinder fit REALLY tight, had to hammer them down! so they won't go anywhere.. https://uploads.tapatalk-cdn.com/202...6d9192ba96.jpg https://uploads.tapatalk-cdn.com/202...6a605af42f.jpg Tested it for the first time, it's alive! https://uploads.tapatalk-cdn.com/202...5f6ac35015.jpg https://uploads.tapatalk-cdn.com/202...bfe54199f2.jpg Also trying this lower battery mount, seems to be clearing just fine! I'll probably add more mounting positions to use bigger batteries as well (e.g. chassis and over the axle). https://uploads.tapatalk-cdn.com/202...ec5c3a1140.jpg And the classic side test. https://uploads.tapatalk-cdn.com/202...16082b606b.jpg |
Re: Sportsman + 3D print: Lil Doggy Really like all the parts on this rig! Nice work designing and putting it all together. |
Re: Sportsman + 3D print: Lil Doggy Nice crawler and build thread! Thank you for sharing your experience with the community. And thank you for your purchase of CI foams. "thumbsup" |
Re: Sportsman + 3D print: Lil Doggy Humbold had great eye catching the weakness on the rear axle truss. The thing snapped pretty easily after stress testing the rig. https://uploads.tapatalk-cdn.com/202...4c1f725ad0.jpg So I re-designed it, making sure it would touch the surface below to avoid twisting back/forth. This resulted in not even needing the arms. Now is solid as a rock. Tested out, did some reckless driving and everything hold up great! https://uploads.tapatalk-cdn.com/202...83c429a6fb.jpg https://uploads.tapatalk-cdn.com/202...c6d306dabd.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: Lil Doggy Just stumbled across this, cool project. When I get some time I want to build a shafty comp crawler. I have a pair of AR60's laying around so will likely at least use one in the front, might have to get an AR44 rear axle like you did...seems to be a common combo. Good work! |
Re: Sportsman + 3D print: Lil Doggy Thanks, Garyk! Had some time today to work on the body and finish this thing up! The Hardline body is not as ugly as I thought, it's kinda growing on me :D https://uploads.tapatalk-cdn.com/202...c75d7c580c.jpg https://uploads.tapatalk-cdn.com/202...7f3ea7318d.jpg https://uploads.tapatalk-cdn.com/202...d2e941f1da.jpg |
Re: Sportsman + 3D print: Lil Doggy The plated zinc knuckle weights were fun to build and worked great but turned out that I could actually use some extra weight up front. I got some tungsten weights from Amazon that were surprisingly cheap in the shape of 3/8" cylinders. Went ahead and designed a new weight holder for the wider diameter one, where I could fit up to 8 cylinders, which is about 4oz! https://uploads.tapatalk-cdn.com/202...00f9c52520.jpg https://uploads.tapatalk-cdn.com/202...c73a7c4505.jpg Working to put this together and test it out. |
Re: Sportsman + 3D print: Lil Doggy Did some little adjustments to make sure the Tungsten weights where fitting in perfectly and felt tight. Ready to test! https://uploads.tapatalk-cdn.com/202...3519a716e5.jpg https://uploads.tapatalk-cdn.com/202...ef16a06bbb.jpg https://uploads.tapatalk-cdn.com/202...41635cab61.jpg https://uploads.tapatalk-cdn.com/202...39f6bc84b0.jpg https://uploads.tapatalk-cdn.com/202...a6beacc895.jpg https://uploads.tapatalk-cdn.com/202...57642d98b6.jpg https://uploads.tapatalk-cdn.com/202...f212763042.jpg |
Re: Sportsman + 3D print: Lil Doggy My next step will be to make a high clearance diff cover. This has been way harder than expected, but is coming along. Inspired on the Progressive RC Barber AR60 cover (that dude is insanely creative). Don't expect mine to be as good, but functional. https://uploads.tapatalk-cdn.com/202...56d194ad24.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: Lil Doggy Point of no return one more time! Designing this thing was way harder than I expected, but is coming along. https://uploads.tapatalk-cdn.com/202...1950bfdea0.jpg https://uploads.tapatalk-cdn.com/202...c2b39252f3.jpg https://uploads.tapatalk-cdn.com/202...214bd46a53.jpg https://uploads.tapatalk-cdn.com/202...b4654ff636.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: Lil Doggy And..... Working! Still space for improvement tho https://uploads.tapatalk-cdn.com/202...a88ef4b8fe.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: Lil Doggy Quote:
|
Re: Sportsman + 3D print: Lil Doggy Yup - the axle is just a close replica for mocking, the rest is at precise scale. Was required to designed it! |
Re: Sportsman + 3D print: Lil Doggy I like where you're going with that cover... and the whole car for that matter. In the last pic, is the face of the cover 1 piece with the bottom? Are the bearing caps incorporated into the cover now that the lower bearing cap bolt holes have been cut? Is the underside just held on by 2 screws after drilling upwards into the housing? I've got a couple ar60 housings (that I previously wore through the bottom of) laying around that I wouldn't mind experimenting with. |
Re: Sportsman + 3D print: Lil Doggy Quote:
|
Re: Sportsman + 3D print: Lil Doggy Quote:
About your question SurlyBurly, I simply use Tinkercad. |
Re: Sportsman + 3D print: Lil Doggy 2 Attachment(s) Awesome rig, really like all the custom printed components you've made! I'm using the Progress RC barber mod covers on my sporty. I made a quick jig to attach the ar60's to that I can run against the fence of my bandsaw to get the desired cutoff, 33mm in the case of the Progress RC covers. Once you get your covers for AR44's how you like it, do you plan to put it on Shapeways? Cheers, Gable |
Re: Sportsman + 3D print: Lil Doggy Hey pcgab, yes I would be fine putting them in shapeways. I'm still not done with the AR60 tho, I want to get more clearance out of it, trimming the housing further (more to come on this soon). I like the idea of doing the same on the AR44, I will probably do that next. Need to check how much clearance is there to gain actually. AR44 housing has a smaller pumpkin so not sure if needed. |
Re: Sportsman + 3D print: Lil Doggy Watching the axle cover I was pretty sure it can be trimmed quite a bit more. Took a stab and trimmed all the way up to the bearing! https://uploads.tapatalk-cdn.com/202...009db1700c.jpg https://uploads.tapatalk-cdn.com/202...a85716ceba.jpg https://uploads.tapatalk-cdn.com/202...f55b5b01d2.jpg Next step: changing the design to match the extra ~4mm of clearance! https://uploads.tapatalk-cdn.com/202...701a1d5e9c.jpg https://uploads.tapatalk-cdn.com/202...2dc7257c42.jpg I'll call it "Pacman" LoL - eating the gears! I think it's ready, now will do some field testing! https://uploads.tapatalk-cdn.com/202...853c054091.jpg |
Re: Sportsman + 3D print: Lil Doggy Got this HR Diff Locker in the mail. https://uploads.tapatalk-cdn.com/202...69a4119c41.jpg It's way thinner than the stock one. So updated my cover to take advantage of the extra clearance! https://uploads.tapatalk-cdn.com/202...01fe8ddf26.jpg https://uploads.tapatalk-cdn.com/202...0a2a53cba9.jpg At this point the bottom of the the AR60 axle is basically completely flat besides the bevel gear cover! https://uploads.tapatalk-cdn.com/202...04f3c765f7.jpg https://uploads.tapatalk-cdn.com/202...c840d18bcd.jpg |
Re: Sportsman + 3D print: Lil Doggy Got 3S batteries of 450mAh, 650mAh and 850mAh. All of them fit behind the servo. The 850mAh tho has a very tight fit, almost rubbing with the drive shaft and the lower links. Decided to build some sort of plate. Took a piece of this really strong plastics that I got, don't remember exactly the name, but is stronger than lexan. Cut a piece, flipped the truck and lay down the plate somewhat aligned with the axle, battery and servo. Then applied the heat gun and let it melt a bit to take the shape of the bottom. Worked flawlessly. https://uploads.tapatalk-cdn.com/202...6387226749.jpg https://uploads.tapatalk-cdn.com/202...551a880684.jpg https://uploads.tapatalk-cdn.com/202...b132997417.jpg |
Re: Sportsman + 3D print: Lil Doggy I created a Shapeways shop in case anyone wants the pieces I've built. https://www.shapeways.com/shops/d440rc-designs Fill free to ping me with comments/suggestions. |
Re: Sportsman + 3D print: Lil Doggy I made a video to explain how to mod the AR60 axle and install the Pacman! https://www.youtube.com/watch?v=mLcVg_PISLg |
Re: Sportsman + 3D print: Lil Doggy What happened to the diff covers on your Shapeways? I saw them earlier, then refreshed the page and they're gone. I'd really like to give one a try and if it goes smoothly on my worn out plastic axle, maybe even try it on a Chinese "steel" (potmetal) housing. I think with a full width truss on top, it could still stand up to some abuse. edit: I see now after reading the comments on your install video |
Re: Sportsman + 3D print: Lil Doggy Quote:
|
Re: Sportsman + 3D print: Lil Doggy You could share just the design on someplace like Thingiverse |
Re: Sportsman + 3D print: Lil Doggy Realized ny wheelbase was way far from comp specs! The rig was at 13.75" ! LOL. Had to do some link work. Overall wasn't that bad. https://uploads.tapatalk-cdn.com/202...27be2416a6.jpg Now I'm exactly at 12.5" at max stretch. Also took some time to shave the HB White dot Rovers. They look very narrow now! And I have full clearance for steering! Also checked the width of the front and I'm getting 11", which I think is perfect and on the rear 10". I like it narrower in the rear, will see how it goes, I may add 1/2" if I see challenges. https://uploads.tapatalk-cdn.com/202...c957a8196b.jpg https://uploads.tapatalk-cdn.com/202...09aacfbb44.jpg Finally been thinking of different wheel designs, and did some testing. I might install one of these... https://uploads.tapatalk-cdn.com/202...2935139616.jpg https://uploads.tapatalk-cdn.com/202...c30044ed98.jpg Sent from my GM1917 using Tapatalk |
Re: Sportsman + 3D print: Lil Doggy Wanted to change the transfer case as I think the axial is too wide, but also didn't wanted to change the gears as other options are usually hard to find and expensive, while standard axial scx10 are everywhere and super cheap. Designed a new transfer to also mount the motor forward, which will better balance the rig, also putting the motor as centered as possible. Tested out and working! https://uploads.tapatalk-cdn.com/202...08c6c47d4c.jpg https://uploads.tapatalk-cdn.com/202...110977e0dd.jpg https://uploads.tapatalk-cdn.com/202...3f6c46233c.jpg |
Re: Sportsman + 3D print: Lil Doggy Doing more thinking i would like to also make the skid plate smaller along the way... This is where I'm at now, a transfer case that includes the skid plate.. next will be to tested out and modify the chassis and links to fit the new skid. https://uploads.tapatalk-cdn.com/202...6b6e989db9.jpg https://uploads.tapatalk-cdn.com/202...d5207a5d15.jpg https://uploads.tapatalk-cdn.com/202...962c88c71f.jpg |
Re: Sportsman + 3D print: Lil Doggy People asked me "whats the difference with a simple axial transfer?", ""At a glance, looks the same!". Well, it's quite different, here's a picture to illustrate. Can you tell the difference? https://uploads.tapatalk-cdn.com/202...71f1125543.jpg The gears sit lower and closer (narrower) so the front motor mount will locate the motor at the bottom of the skid and beside the shaft. I think having a front axle with pumpkin offset (like AR60) it's a must to make it work. Basically, the spur sits ~5mm lower and ~12mm closer to the center compared to a standard Axial gearbox, using less space overall and allowing locating the motor low at the skid level and as centered as possible. https://uploads.tapatalk-cdn.com/202...0b94daf89c.jpg https://uploads.tapatalk-cdn.com/202...9d4a834fdb.jpg Printed it out, and works! Looks way smaller than I expected [emoji1], really narrow and centered. Realized of couple tweaks I want to do to make assembly easier.. improvement opportunities never end I guess... https://uploads.tapatalk-cdn.com/202...89e2803128.jpg https://uploads.tapatalk-cdn.com/202...f018a93490.jpg https://uploads.tapatalk-cdn.com/202...16a0ba1569.jpg |
Re: Sportsman + 3D print: Lil Doggy Did some tunning on the design and I think is ready to be tested in the real world. Side by side with the standard tranny looks great. https://uploads.tapatalk-cdn.com/202...2185c86665.jpg |
| All times are GMT -6. The time now is 09:47 AM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com