A.F.M.B. Double Delta Build

Really wasn’t planning to build another one this year, but here we are, Another Fucking Mountain Board…

Idea Double Deltas and his DIY ESC enclosure kit

MBS Agent Deck with their comfy as hell agent grip pads

MBS XLs with their 9” tires and bindings

Radium 6495 @ 175kv from Madesk8

Stormcore 2.0

Flipsky VX4 Pro (have a GB remote but need some help setting it up. Will get around to the discord thing eventually…)

18s4p of P45Bs

My SLM herringbone Beer Drives

Two things motivated me to build this thing. Pairing Double Deltas with an Agent Deck, and having a good platform to test the final version of the Beer Drives. Stoked on how both of them worked out.

I’m not even sure what version of these drives I’m on now. It’s taken a lot of trial and error. The last version was solid, other than where the truck clamp bolted to the gear housing. We ride though a lot of rocky areas and eventually those bolts would strip out after enough impacts. Enter the new truck clamp design.

It’s printed with Maraging Steel. Here’s a link to the product page if you’re curious. Maraging Steel - Material Guide | Craftcloud® . The herringbone gears are made from the same material. I won’t go into too much drive detail here because they will eventually get their own thread after my friend and I have put them through hell. His set should be here soon.

See above, they are super low profile similar to (and heavily inspired by) Apex Airs.

Below you can see the SLM aluminum push fit adapter designed for the Rockstar XL hubs. Zero hardware to the hub.

Here’s a shot of the gear housing being pulled away from the truck clamp. You can rotate it a bit to get different angles if wanted. The Double Deltas really only allow for this spot but it’s money.

Quick clip of them running on the bench.

Until today it’s just been a few street runs to test the drives. We got up early this morning and headed out to Point Sal, which has always been our proving ground for new builds due to the mix of terrain you get out there.

The goal was to test the drives on some rough terrain, but I did not mean to test them as hard as I did. There’s a gouge in the trail towards the beginning that you can try to jump over or slowly ride around. I chose the former and my 6:20am legs didn’t agree with that decision. Took the gear housing hard directly on to a rock. Motor was spinning and the wheel was not. Only thing that happened was the backlash adjustment doing its job and disengaging the motor gear from the driven. Gears still look new. Quick backlash adjustment and I was up and running again.

We made it to the beach for a spooky beer break.

Seeing the drives survive an impact like that was a major confidence boost so I really got to enjoy this thing on the way back. I swear the Double Deltas are like Dualities and Airs had an illegitimate love child and didn’t tell anyone. So divey and do a great job of dampening some of the rough trail. Turning radius is almost as tight as Dualities and you get all of the off road goodness that Airs offer. The longer Agent Deck with flared out spots for your feet give such a comfortable ride and let you really dig into those turns. I didn’t take it past 27mph but that’s fast on this ride and I really don’t creep much past 30 even on street unless I’m really feeling it. Tom doesn’t really advertise and I think that’s a big reason why his trucks aren’t seen in more builds.

Anyways, my garage is in shambles after building this and working on an unexpected plumping project. Time to drink more beer and get to work! Cheers :clinking_beer_mugs:

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That is a great name. I’m surprised I had not thought of it…

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Curious design feature with the pins on the clamp, i imagine those points would be under a lot of repetitive stress, will be interesting to see how they hold up!

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I’d have personally made the clamp part with blind holes, and green loctited in tight fitting dowel pins, to achieve the same geometry. Interesting design, lets see if it holds up!

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Following your gear drive progress closely friend. Wish you lived closer so we could offroad together.

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That’s exactly what @BenjaminF suggested and it’s still a backup plan if the clamp fails. I decided to go this route for simplicity and to avoid renaming these to Ikea drives :sweat_smile: . That impact I had yesterday morning was probably the hardest I’ve come down on a drive. Surviving it gives me hope that these may hold up. We’ll see!

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God fucking damnit :man_facepalming: i only just now got the pun in your username

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Knighted by the beer gods. If these clamps fail you can give me a well deserved I TOLD YOU SO!

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@SirVesa any updates on any of the SLM gear drives? How are the various versions that are currently in service all holding up?

Also, any update on making a dedicated thread for the SLM drives? Whenever i tell people about your designs and experimentation I have no choice but to link them to three different build threads to get the full story :grin:

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Yeah, I wish everything was progressing faster but it’s really just me thrashing on them for now. My buddy should be receiving his set any day and he rides harder than I do. So far I am extremely happy with the latest version but am hesitant to release something that might be unsafe. If this version lasts through the summer (and I think it will) I will make thread. My hope is that this will inspire some of you guys who are actual engineers to design something even better.

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I strongly encourage you (entirely for my own selfish reasons) NOT to wait until the design is “done” or “ready” or “proven” to make the thread about them.

For one thing, no DIY project is EVER done :joy: as we all know very well.

For another thing, having all your design/manufacturing/testing/etc. experience put together in one place will be a huge help and a massive contribution to the forum, regardless of whether or not any of your specific designs are “ready” for public release.

From my perspective, the really amazing contribution you’re making to the forum is the information on how people can economically design and manufacture their own one-off gear drive designs. You’re basically democratizing DIY esk8 drives, at a time when this dwindling community desperately needs it! Your actual design files for a specific version of these drives are amazing, but your knowledge about the process of making them is even more valuable in my opinion!

That’s just me though. I’m certain that plenty of people will only care when the part files are published and ready to be sent to the printers lol.

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I don’t care what anyone says about you @BenjaminF , you’re a big sweetheart :sweat_smile: . Haha seriously though, cool of you to say. I’m having a lot of fun with the project but it’s not exactly cheap. No BS, I really do think it’s dialed in this time. I’ll get a dedicated thread going for them ASAP.

You already saw the “hardware-less” truck adapter. In my quest to say fuck hardware, this is the next experimental part of the drive I’m testing. Steel pegs straight to the gear adapter for easier swaps to using different hubs.

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I don’t know who is saying what about me, but they’re probably right :joy:

Can’t wait! I’ve got a lot of ideas for different gear drives kicking around in my head.

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My friend ordered his set with custom anodized SLM 6061 so that will make an awesome cover picture for the thread. I’ll make time to get it rolling as soon as it arrives. Seriously can’t wait to see what you guys come up with, especially if it’s open source.

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Wonder how many times i’ve said or felt this way…. I agree with everything the duck said.

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Dude I want to see what type of motor mounts you design. Some long enough for a chain drive would be awesome.

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Will def be long, i need to allow for 100t pulley with space for idlers and probably handle/bullbar/light mounts… gonna end up pretty big :sweat_smile:

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Some SLM fails with the parts shown in the above rendering. Looking at that will make everything here make more sense. I made the tolerances too tight. This can be a challenge with SLM and honestly, I fucking knew better. My strategy so far has been to make tolerances too tight, then re-order with what I think will work after filing / drilling. Took that a little too far this time.

BELOW : The center opening on the hub adapter was printed with only .05mm increase in diameter larger than the OD of the gear adapter bearing catch it slides over. There is no reason for these parts to hug each other so no clue why I made the tolerance so tight. A step bit can fix this for now.

As with SLM, raised structures print with a slightly larger diameter, while pockets print with a narrower one. The pegs on the hub adapter do not fit into the receiving holes in the gear adapter. Forgot the exact tolerance I used but it was under .1mm combined. 0.15 to 0.2 is usually a decent mix going either smaller on raised parts or wider on recessed or a combo of both. A drill bit easily fixes this but the final version should not need one.

A little more work with the step bit and this will work fine. But that’s not the goal of these SLM drives. I want them plug and play for anyone. I recently got a slightly better printer, Qidi 4 plus, so messing with some more test prints then will put in another SLM order. Another note, the threaded version of this part of the drive being used in two setups (one being a retrofitted Apex drive) has zero issues. This is just a QOL improvement. Hoping my friend’s full SLM drive gets here soon so we can get this thread rolling. Meanwhile, I’m going to place another SLM order to try to get this push fit setup dialed in.

Side note, stoked on this printer! 305 x 305mm bed so working on something to keep my feet from hurting on the DWIII decks. Going to incorporate mounting holes for goofy setups too and install deck inserts for that. This is just a low infill petg prototype but it seems to conform to the deck edges perfectly!

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