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  #21  
Old 04-30-2017, 05:37 PM
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Default Re: Another Structo Dump Truck Conversion

Aww, no more sports dump truck?. Looks like a good restart!

I like the spring hangars, but that shackle may limit the suspension movement. If you want more suspension articulation later, you can often swap the brass leaf bushings for a piece of silicone fuel tube/aquarium air line.

The rear pinion angle looks good, how does everything feel with some weight on it?

What size hexes do your new wheels have?
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  #22  
Old 04-30-2017, 05:50 PM
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Default Re: Another Structo Dump Truck Conversion

The wheels I want to use are smaller than the redcat hex. My wheels are from a dromida sct, and the size, tread and wheel style are all pretty good look for a dump truck.

I remember seeing fuel line bushings, is that so there is some give and flex? My brass bushings are pretty loose.

The springs seem okay, but haven't really tested it yet...

Last edited by Rvjimd; 04-30-2017 at 05:52 PM.
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  #23  
Old 04-30-2017, 08:23 PM
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Default Re: Another Structo Dump Truck Conversion

Brass bushing gives you vertical travel as the leaf moves, but binds when tolerances close with off axis movement. With a solid axle say left wheel is on bump, right is drooped, the shackles pinch leaf and stop travel. Sloppy tolerances let it rattle around and flex a lot. Soft bushing gives more travel, some damping. It's more of a rock crawler trick, like tapering the leaf eyes so you may not even want or need it.

Looks like your rim uses 8mm hex. So maybe... thttps://www.amazon.com/gp/aw/d/B01NBASGBG/ref=mp_s_a_1_9?ie=UTF8&qid=1493598059&sr=8-9&pi=AC_SX236_SY340_FMwebp_QL65&keywords=8mm+hex+w heel+rc
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  #24  
Old 05-01-2017, 06:47 PM
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Default Re: Another Structo Dump Truck Conversion

I made adapters for the hex, I'm not sure I saw anything off the shelf to go from big to small? Got the rear axel mounted, I think I'm gona need another helper and a tweak to get it right. Now to the front and mount the transfer case.






Jim
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  #25  
Old 05-01-2017, 09:12 PM
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Default Re: Another Structo Dump Truck Conversion

They usually don't do big to small hex adapters, you just replace the big hex with one your new size that fits the shaft and cross pin.

Looking good, but I might move the aft spring hangar back a little, the shackle looks like it doesn't have too much travel before maxing out that spring. I had issues with shackle flip on some big bumps like that.
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  #26  
Old 05-01-2017, 10:21 PM
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Default Re: Another Structo Dump Truck Conversion

Hey Jim, thanks for sharing that idea you had with the nuts to mill the hex sides. Pretty good idea. I've been wanting to get some 5c collets just so I could have the collet blocks for hex and square sides but that bolt idea is clever.
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  #27  
Old 05-02-2017, 07:01 AM
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Default Re: Another Structo Dump Truck Conversion

Cooper, the hex nuts worked better than I expected, but the size was a good match for the stock so it helped center the round stock. The set screws keeps the stock from rotating inside the nuts. And, since you have to release from the vice and rotate, you have to use a stop or something to index the part for the subsequent operations.

Short version of this story, I ended up buying a spin indexer and 5C collet set!
It is much quicker since you don't have the vice issues to deal with.

Jim
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  #28  
Old 05-02-2017, 09:22 PM
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Default Re: Another Structo Dump Truck Conversion

Got the motor/transfer case mounted, but I think I'm gona move it back about half an inch to make the front drive shaft fit easier. The front springs are ready.



Jim
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  #29  
Old 05-05-2017, 08:48 AM
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Default Re: Another Structo Dump Truck Conversion

Looks like yours is this the 1964-65 version.
http://www.tnttoytrucks.com/Structo603.html

Ane you hanging the trans below the chassis?
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  #30  
Old 05-05-2017, 08:56 AM
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Default Re: Another Structo Dump Truck Conversion

Ya, that's where it is for now. Doesn't leave much clearance but helps with the angle of the drive shafts.
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  #31  
Old 05-17-2017, 12:03 PM
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Default Re: Another Structo Dump Truck Conversion

Finally got back to the dump truck project. Decided to move the motor/transfer case up a bit to improve the ground clearance. Now I have to figure out what to do with the front drive shaft? It is pretty short and has a pretty steep angle.





Jim
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  #32  
Old 05-17-2017, 10:12 PM
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Default Re: Another Structo Dump Truck Conversion

Looks like it's coming along well.

Got a pic of the front driveshaft angles? You might be able rotate the trans off center to stretch the front shaft some.
What does your breakover angle look like with the trans that low?
Does the spur gear interfere with the cab? I ran mine spur fwd for a little more clearance.
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  #33  
Old 05-17-2017, 10:29 PM
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Default Re: Another Structo Dump Truck Conversion

I checked the cab clearance several times and I think I'm okay, got it as far aft as possible. If the power comes back on tomorrow I'll be back in the shop...
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  #34  
Old 05-19-2017, 07:32 PM
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Default Re: Another Structo Dump Truck Conversion

Making a few U joint parts, gona be able to make a new simple drive shaft that will use a pin and slot to allow it to float.



Jim
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  #35  
Old 05-26-2017, 05:30 PM
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Default Re: Another Structo Dump Truck Conversion

I'm getting close to having an actual operating dump truck! It goes and steers, I don't have the front drive shaft hooked up yet, need to make a drive shaft.

Got the lift mechanism working, need to tidy up a few bits and test it with some weight. Looks to me like the speed is about right, got lucky with a motor I had on hand.

https://youtu.be/b-pTdpjsn_M

Jim
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  #36  
Old 05-27-2017, 08:17 AM
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Default Re: Another Structo Dump Truck Conversion

Here are a couple close up pictures of my dump bed lift actuator. The screw is 10-24 all thread about 1.5" long. The push tube is made from 3/8" delrin solid round. I drilled and taped the first 3/8" to be driven by the all thread screw and the rest of it is clearance drilled to reduce the friction load on the motor since the entire tube doesn't need to be threaded. The motor is from servo city and the mount is a piece of square stock that I milled to allow the motor to fit out the top and there is a slot at the front that keeps the assembly from rotating. There is a screw/pin at the front that keys into a hole in the truck frame to keep the assembly from sliding back when the box is up past the balance point where it wants to pull on the screw and motor pod. I used a set screw on each side to hold the motor in the mount. The coupler is made from 3/8" aluminum with two set screws to hold the screw shaft and lock to the motor shaft.













Jim

Last edited by Rvjimd; 05-27-2017 at 08:32 AM. Reason: Two more pics...
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  #37  
Old 05-28-2017, 04:09 AM
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Default Re: Another Structo Dump Truck Conversion

Pretty slick bed actuator.
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  #38  
Old 08-18-2017, 10:41 AM
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Default Re: Another Structo Dump Truck Conversion

I made a little details video of the actuator on the truck.

https://youtu.be/XSUyETpCy9M

Jim
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