Build Thread 1:12th Scale Rollback Truck Ideas

[James A. Doty]

I found an stl file for rims I'll be using. I think they'll look great.

I have the parts off the print bed but haven't had time today to remove all the support material and put them together.

 

[James A. Doty]

Here's two of them ready for screws. I have enough M2.5 screws but they're all too short, so I'll have to order more of them. At least 36 of them.

Also, this is turning into a 1:15th scale rollback truck, unlike my initial desire for 1:12th scale, I decided to use the chassis from a WPL B16 and it's left and right wheels aren't far enough apart to make the truck larger without it looking odd. Still, I'm making progress.

Major items left to do:
design and print mount for lift servo
finish designing and print the front cab to chassis mount
design and print the sub-frame for the rollback bed
design and print a headache bar for the back of the cab
design and print a holder for the battery, receiver, and esc

 

[WickedFog]

Looking great so far!

 

[James A. Doty]

The rims I chose kept breaking when I tried to put them together so I found one piece rims I liked and printed them, it was a single tire rim and a dually rim. The dually rim worked great, I printed four of them. But the single tire rim is the wrong size for the WPL C94 tires I'm using for the front axles.

So I spent the last two days designing new rims for the front axle. I have one printing now in draft mode to see if they'll work for me. If they will I'll design dually rims for the back axles.

 

[James A. Doty]

I think I've finally finished the mods needed to use the WPL B16 chassis. The rear wheels are moved back, I've installed a longer driveline to go from the gearbox back, the two speed gearbox is setup and the servo is properly adjusted, and I designed rear rims that fit the front tires of the WPL C94.

I'm not 100% happy with my electronics tray so I redesigned it but I'm waiting for four rolls of PETG I ordered to arrive so I can print it.

I'm measuring out the dimensions I'll need for the sub chassis the flatbed will sit on. I need to design the sub chassis so neither it or the bed have clearance issues with the electric motor and gearbox. I also need to design the servo carrier for the tilt assembly, but need to get the sub chassis designed first.

I've designed the front cab mounts and will print them when I print the cab since they're integrated.

I think my rim designs are fantastic, they're currently my favorite part of the build. Those rims were the most challenging parts I'd ever designed in Fusion. It's a bit of a challenge to mount the tires on the dually rear rims, but worth the effort.

I'm a putz, you can see in the photo that I didn't make the opening in the back of the electronics tray large enough to get more than one servo cable through it. I need to get no less than four servo cables through it.

I'm trying to leave enough room above the electronics tray to add a partial interior to the cab. Maybe I should start over on the electronics tray and design it so the battery is centered so it would fit under the engine hump in the cab.

I'd have to do something about the giant eight channel receiver. I have a slightly smaller ten channel receiver I wanted to use but it won't work with the RadioMaster MT12.

 

[CertifiedMike]

I think I've finally finished the mods needed to use the WPL B16 chassis. The rear wheels are moved back, I've installed a longer driveline to go from the gearbox back, the two speed gearbox is setup and the servo is properly adjusted, and I designed rear rims that fit the front tires of the WPL C94.

I'm not 100% happy with my electronics tray so I redesigned it but I'm waiting for four rolls of PETG I ordered to arrive so I can print it.

I'm measuring out the dimensions I'll need for the sub chassis the flatbed will sit on. I need to design the sub chassis so neither it or the bed have clearance issues with the electric motor and gearbox. I also need to design the servo carrier for the tilt assembly, but need to get the sub chassis designed first.

I've designed the front cab mounts and will print them when I print the cab since they're integrated.

View attachment 275956

I think my rim designs are fantastic, they're currently my favorite part of the build. Those rims were the most challenging parts I'd ever designed in Fusion. It's a bit of a challenge to mount the tires on the dually rear rims, but worth the effort.

I'm a putz, you can see in the photo that I didn't make the opening in the back of the electronics tray large enough to get more than one servo cable through it. I need to get no less than four servo cables through it.

I'm trying to leave enough room above the electronics tray to add a partial interior to the cab. Maybe I should start over on the electronics tray and design it so the battery is centered so it would fit under the engine hump in the cab.

I'd have to do something about the giant eight channel receiver. I have a slightly smaller ten channel receiver I wanted to use but it won't work with the RadioMaster MT12.

Are you sure the receiver won't work with the MT12? Just wondering.
Ultra compatability is one of the greatest features on the MT12!

The chassis is looking great! Nice work!

 

[James A. Doty]

Are you sure the receiver won't work with the MT12? Just wondering.
Ultra compatability is one of the greatest features on the MT12!

The chassis is looking great! Nice work!

Thanks, the chassis' from a WPL B-16, though I did move the rear axles back as far as I could without drilling new holes.

The ten channel receiver I was going to use is a HotRC F-10A. I was stunned to find a ten channel receiver for under $9.00. That's crazy. All the looking around told me it couldn't be done, so I'm just not sure. In the process of trying to make the F-10A work with my transmitter I did install the most recent updates for my MT12.

I'm still a novice when it comes to setting the MT12 up but I've learned a lot and I absolutely love that radio. But I never did find a way to bind it to the HotRC receiver. I have the MT12 4in1.

I'd like to buy the ELRS add on, but admit that I'm not really sure which one the MT12 4in1 uses. I think it's the Ranger Nano though.

 

[CertifiedMike]

Thanks, the chassis' from a WPL B-16, though I did move the rear axles back as far as I could without drilling new holes.

The ten channel receiver I was going to use is a HotRC F-10A. I was stunned to find a ten channel receiver for under $9.00. That's crazy. All the looking around told me it couldn't be done, so I'm just not sure. In the process of trying to make the F-10A work with my transmitter I did install the most recent updates for my MT12.

I'm still a novice when it comes to setting the MT12 up but I've learned a lot and I absolutely love that radio. But I never did find a way to bind it to the HotRC receiver. I have the MT12 4in1.

I'd like to buy the ELRS add on, but admit that I'm not really sure which one the MT12 4in1 uses. I think it's the Ranger Nano though.

I don't own an MT12 but I sure do like them! I am not really into programming stuff. My laptop isn't even on line. Lol!

I don't know which ELRS is correct either.


$9 is crazy cheap for a receiver! I hope you can find a way to make it work!