Build Thread D3MON's D-28 Drift

[HPIguy]

@WickedFog and @D3MON you should both host a 3D printing for n00bs class. I'd happily sign up. LOL

 

[D3MON]

@WickedFog and @D3MON you should both host a 3D printing for n00bs class. I'd happily sign up. LOL

still trying to figure out 3d printing myself lol. do have some time into chassis fabrication and welding though.
if you do ever want an opinion on a design or bounce ideas for a way to go about it feel free to message for sure.
That said, everything I've learned/done so far is self taught by messing up big time constantly and still may be wrong

 

[D3MON]

somewhat of an update!
i think i technically have a wheel-less roller!

that said at the moment it looks like this:

The entire module where the servo is, is going into the reject pile.
Was not enough clearance between the where the bulkhead and servo sliders meet. attempting to resolve this by skimming down from 3mm thick servo horn to 2mm, and i am raising the servo sliders 1mm.
this also gives me the opportunity to resolve the in-set of the rx try posts, and revise the front bulkhead and front shock tower to align with the shocks.

 

[WickedFog]

@WickedFog and @D3MON you should both host a 3D printing for n00bs class. I'd happily sign up. LOL

I have helped a few people via Teamspeak to give them some one on one live help. Hell, I was on the phone for hours with Greywolf and Stoner helping them build their Ender 3 V2's. That's like the best way for me to help. If anybody ever wants some assistance with Fusion, just shoot me a PM. I don't know many of the newer slicer software, but they all do kinda the same thing.

 

[D3MON]

I have helped a few people via Teamspeak to give them some one on one live help. Hell, I was on the phone for hours with Greywolf and Stoner helping them build their Ender 3 V2's. That's like the best way for me to help. If anybody ever wants some assistance with Fusion, just shoot me a PM. I don't know many of the newer slicer software, but they all do kinda the same thing.

one of these days might have to get with you to learn some of the features with Fusion, am able to get most things to work, but i know in some cases its just brute forcing it

 

[WickedFog]

one of these days might have to get with you to learn some of the features with Fusion, am able to get most things to work, but i know in some cases its just brute forcing it

I'm still learning it, but it's not hard to figure out. The whole parametric modeling thing is cool, but it adds a lot of unique things to the learning curve compared to other software I've used.

 

[D3MON]

And we have wheels on!... sorta...

and some steering angle shots:

am very happy that the steering angle appears to be close to how i wanted it.

although its sitting on all 4 wheels, my "ill check that later" came around and bit me, i hadn't gotten around to accurately checking rear track width, and as it sits it is about 5mm too narrow in the rear. I am going to have to widen out the rear hub carriers to get better clearance from the rim to the carrier, then my rear "spool" will need to be corrected by cutting a new piece of 5mm tube longer then re-notch that, so that i can spread the axles wider.

another possibility that i am toying with is just printing to rims to be deeper dish by 3mm each. these are just the rear rims and i don't see a reason it will hinder the car. (if anyone can think of how it would please do tell!!!).
This isnt the right way to do it, and once i get some actual drift tires/rims, i would need to revisit it.

along those lines, does anyone have a set of drift tires for mini scale handy that they could measure wheel width and the offset of the mounting point to the back of the rim?

anyways going to work on the rear shock tower for now.

thanks for checking it out!

 

[D3MON]

made quite a bit of progress today on the car.

starting with the rear shock tower:

originally was planning on the shock tower "bending" forward to place the mounting holes over the trans halves, this was not going to work without looking really goofy, and needing quite a bit of spacing on the bottom to make the shock vertical.
it did work out bending it backwards by about 2mm, and this placed the shocks under 1mm from vertical so close enough for me.
also had to reword the lower a-arms as the axle knuckle was hitting the a-arm.
(need to add approximately +3mm to the shock tower height, i underestimated the shocks I'm using.
next was to design a "shelf" to hold the ESC, 1/10 i know its popular to put the ESC in the back, so i went for that approach.

don't know if I'm excited it being at an angle or not, but it lines up with the rear shock tower and seems to hold stable.
installed:

overall I'm happy with how this turned out.

 

[D3MON]

i did create a poll want some input regarding design pics if you like to see them, dont care to see them etc.

as you can see in the pictures from the previous post i got the electronics (what i have at least) installed.
have a few checklist items before complete.
including:
battery holder strap---
originally was going to use posts on each end, but getting the one between the wires is a PITA! trying to brainstorm ideas for how i can do this, thinking trying to utlize a rubber band but need to figure out a hooking system that will only increase height by a few mm, and wont widen the battery tray as its already rubbing the body i am intending to use.
rear shock tower---
increase shock mount height 3mm
rear spool---
need a longer one for when i get actual drift wheels and tires.
ball ends---
need to revisit the ones in front, a little too tight and hinder shock springs.
front bumper---
need to figure out a method to attach and design one.
Gyro---
finding a decent place for one might eventually sit next to the Rx once i get a smaller spektrum one. with the holidays here this is probably going to take the longest as dont have alot of funds to drop into one at the moment.
also any recommendations for a mini gyro?

pictures as it sits now! might try test driving it here soon once i get the rear shock tower done. might print some temp slicks out of some 85+ tpu i have.

Thanks for looking!

 

[Doom!]

Really enjoying this build. I voted yes to the design pics, I like seeing how folks set their stuff up. I know it takes some effort to get all the pics, and do the running dialog that goes with them. Just know it's appreciated.

 

[D3MON]

Really enjoying this build. I voted yes to the design pics, I like seeing how folks set their stuff up. I know it takes some effort to get all the pics, and do the running dialog that goes with them. Just know it's appreciated.

thank you! I'm having alot of fun and learning a ton.
its kind of funny imo with a build this small, ill sit there and design it, but then when i go to print there is material missing, and just get the "duh" feeling when you realize what you wanted was smaller than what the nozzle can do.
Good to know, i know i like seeing design pics in builds to understand it better but i also do know that some think of it as clutter lol.

 

[Doom!]

ill sit there and design it, but then when i go to print there is material missing, and just get the "duh" feeling when you realize what you wanted was smaller than what the nozzle can do.

That is something I hadn't considered and gave me a good chuckle.

 

[D3MON]

spent some time trying to optimize some of the design. starting with the front trying to free it up some and gain some travel as i knew the chassis had more in it mechanically, but could just not get any more. so started doing some more digging.

first issue i had was it was bottoming out before the chassis even did, and couldnt figure out why until i saw these:

the shocks stick down barely below the arm, and these made it even worse so, so filed them down. (gotta love cheap knockoff parts am-i-right?)

Next I had left some extra material on the chassis where the hinge pins are. initially i left it there to try to retain as much material as possible, but i realized it was also slight binding the arm on travel, it also didnt help there was a bit of elephant footing on the bottom of the arm exacerbating the issue.

and the biggest issue that i didnt even realize was the ball ends:
i was using the silver ones initially, they are only 0.5 wider at the thickest part than the base!!
black ones are from an SCX24, so promptly switched them out. this did require re-printing the hubs as the silver ones are m2 threads and the scx24 is m1.4
i did have to trim about 1-2mm off the threads so it wouldnt hit the axle stub.

HUGE difference:
left side: first version/unmodified
right side: scx24 ball ends and cleaned up joint.

eventually i may also do the servo horn with them, but i am getting good travel, and they are about 0.5mm taller so id have to lift the servo tray up again, which will happen, to get my arms parallel again.


anyways hopefully more updates tomorrow!
Thanks!

 

[CertifiedMike]

The more pics, the better!
I'm still trying to wrap my head around designing and building my own RC parts, cars...
I'm not really into computers so will be super unlikely to ever try 3D printing but its a lot of fun watching how its all done!

 

[WickedFog]

More pics is always better. Loving this build man.

 

[D3MON]

The more pics, the better!
I'm still trying to wrap my head around designing and building my own RC parts, cars...
I'm not really into computers so will be super unlikely to ever try 3D printing but its a lot of fun watching how its all done!

its alot of fun, i highly recommend downloading a free one, personally id say Autodesk fusion, but there are others and just start playing around with it.
one of these days when i get over not likin to hear myself talk i want to do a ground up design on video. main issue with this build in particular is that alot of it is flying by the seat of my pants and long intervals of research for dimensions lol.

 

[D3MON]

following along the theme of "fix one thing, you break another":
revised the lower A-arms so the shock sits a little higher for two reasons, one i don't like the shock hanging below the a-arm, and two, i wanted more ride height with the shocks i have without lowering the shock tower as it would run into some clearance issues between fasteners and the upper arm.

i had gone straight up vertically which at the slope of the arms, went out just enough to clip the wheel at almost full turn, so need to revise and play with angles to see how far it needs to move.
also came up with an idea for the battery hold down, will do some testing and hope to have something drawn up that isn't just scribbles on a post it note later.

 

[HPIguy]

You need to list this, along with a parts list on Cults3D or the like when you're all said and done. I know people would happily pay a reasonable amount of cash for the files. I personally already pay for 1/24 body files.

 

[D3MON]

made alot of progress today as far as design; though some of it was sidestepping progress for sure. lots of head-scratching, and a few times i about gave up on it, but now it is in the process of having an adjustable length chassis.
this really all started because i was raising the front bulkhead up 1mm, but one thing led to me test fitting the body and realizing that the chassis is 4mm too short.....
spent more time than i would like to admit to retain the space neccesary for the battery when shorter, but also to not open it up so it becomes unsecure when lengthened. most of the cause for frustration is the battery i have available, which is an SCX24 battery and they are considerably larger than most small scale drift cars aprox~15mm longer, 13mm wider, and 3mm taller. the 13mm wider was the most difficult dimension for sure.

Fix (i think) for the battery locator:
(real "DUH" moment in hindsight to not have done this, but we don't talk about that)

Next was the chassis splitting, where to split and how to re-secure it to itself.
went through about 5 iterations before landing on this one, the connectors are spaced far enough apart that chassis twist should be minimal, and there should be enough material and contact patch to be solid

not yet designed in is the upper adjustable connector, going to add material on top of the servo rails to have a series of holes for adjustments approximately ever 2mm interval (i think? might just do the more standard ones, 98, 104, 106, 108), or just do another slider system, though after a few times the plastic gets squished.


few areas i really want to revisit which includes the front of the chassis, and i need to stop getting side tracked and figure out the battery hold down scenario, have a napkin so will see where that leads.

wont be able to print or test anything till sunday/monday for a work trip so hope to have some updates then.

thanks for checking it out and reading through that utter wall of text (if you did) lol

 

[Doom!]

Still reading, and will do so as long as you keep typing. I'm kind of a glutton for punishment.