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Motorized Bicycle Welding, Fabrication and Painting - The Chop Shop Custom fabrication and projects, tanks, frames and more.

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  #1  
Old 12-18-2016, 04:57 AM
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Tony01 Tony01 is offline
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Default Cargo Trailer Build

I'm building a large cargo trailer. I built the frame yesterday evening, today I finished the dropouts and will be welding them on tomorrow. I still have to figure where to put the crossmembers and how to make a box.

The wheels are 26" for now but I'd like to go with 20" someday. Just seems like a better idea and the trailer'd be lower with stronger wheels. I just don't have tires or tubes in 20" anyway.

The inside distance between the box tubes for the wheel mounts is only 3.7". even though fronts have an OLD of 4", the box tubes have a radius which will make welding dropouts difficult, so I figured the 1.5" box has around .180"R and the other one has about .125"R so the dropouts should sit flat and the welds will be nice n strong. Front wheel hubs themselves aren't actually 4" wide so there is no problem, and the trailer can obviously handle 3" wide tires!

I'm thinking of using the big 4x4 box tubing, cutting it lengthwise in 4 places to make 2x2" angle iron and using that are the box corners, then bolting plywood in for the sides. Might be kinda heavy though. The frame already weighs a lot, maybe 25lbs without any other stuff on it...

The overall length is 4ft, don't remember the width.

Cargo trailer frame by Tony K, on Flickr

trailer mocked by Tony K, on Flickr

trailer still mocked by Tony K, on Flickr
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Old 12-18-2016, 11:43 AM
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Default Re: Cargo Trailer Build

It's getting heavy...4x4 tubing you wanna use now?
How big a box made of what? Then there's the load you carry....just wondering
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Old 12-18-2016, 03:00 PM
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Default Re: Cargo Trailer Build

I made this one to carry 6' fencing on and bikes. It connects to seat post with air hose connector.
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Old 12-18-2016, 03:19 PM
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Default Re: Cargo Trailer Build

Quote:
Originally Posted by racie35 View Post
It's getting heavy...4x4 tubing you wanna use now?
How big a box made of what? Then there's the load you carry....just wondering
The inner rectangle is 18x48 and that will be the box footprint I guess. Maybe 10" tall. I guess I don't have to use full lengths of box tubing. Just 3" tall corners to bolt the plywood to. The ply I have is 9/16". The overall trailer width is 31", so that I can tow it through the side gate.

Load will hopefully be up to 200lbs. I have a line on free engines attached to various equipment like Briggs 5hp water pumps and generators, some seized, and I'd prefer to make the least amount of trips.

I hope these 26" wheels can handle the side loads until I get some cheapo steel wheel master 20" wheels for $21 a piece.
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Old 12-18-2016, 04:22 PM
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Default Re: Cargo Trailer Build

Quote:
Originally Posted by scratchbuilder View Post
I made this one to carry 6' fencing on and bikes. It connects to seat post with air hose connector.
Whoa that's a big one. Air hose connector is a good idea. I'm gonna try a hitch using two 3" caster wheels. Hasnt cost me a dime yet. How much weight can it handle? And what is the top speed ya run it at? How's it handle?
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Old 12-18-2016, 05:46 PM
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Default Re: Cargo Trailer Build

Weight, I can only guess 300 distributed. The last I used it 15, 20 mph. It's my bike table now. Keeping it low was my goal. Air hose w/ a 3/4 socket swivel. Forgot to mention the swivel.

Last edited by scratchbuilder; 12-18-2016 at 05:51 PM. Reason: thought
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Old 12-20-2016, 02:50 AM
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Default Re: Cargo Trailer Build

300, nice. I just hope my bike can pull that!!

Some more progress. Gonna be towing it tomorrow.



I did the alignment by clamping tubing against the inner rails and pushing the truer of the two wheels against the tubing. The rails are out of parallel about 1/32" with the smaller dimension at the front. So if I screwed up, then there is a higher probability that I'll have toe-in or zero toe rather than toe-out.

Wheels are 26" for now.

Untitled by Tony K, on Flickr

Untitled by Tony K, on Flickr

I'll be using dual caster wheels as the swivel and hitch. Made a hitch arm with two caster mount positions. When I switch to 20" wheels I can move the caster to the upper position to keep the trailer level. I'll add in a couple of gussets on that box tube.

Untitled by Tony K, on Flickr

Untitled by Tony K, on Flickr

Welded in the dropouts. Some of my best welds and of course nobody will ever see them.

Also put corner brackets with little holes to screw in the plywood.

Untitled by Tony K, on Flickr

still need to cut and fit the plywood, mount the hitch to the bike, find enough 5/16" bolts... lol.. I need 8 of em yea right.. and make a few gussets and weld em in. and paint. argh so much to do.
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MxTrq clutch tuning | msrfan 2spd | 212cc 2spd | 3.5hp 2spd | Thud 2spd | CVT tuning
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