Help with Drawing a gooseneck trailer neck assembly

[benjamin_burkhalter]

I have been trying to figure out how to draw a gooseneck for a Cattle/Horse/flatbed trailer. 

My students and I are stumped.  I am not well versed in cad. We can create simple bumper pull trailer frames but have yet been able to make a 3d Gooseneck neck assembly that we can drop into any trailer assembly plan we make.

I am extremally frustrated, as I am sure  there is a simple process that I haven't discovered. 

Seriously, I need help. I have been trying to figure this out for years. If I draw one in 3D,  When I use the frame generator and place the steel on the wire frame I can not get the beams to match up the angles. 

If I try to do it in multiple wire frames, I cant get the frame members to mate up properly. 

This is an issue I am trying to solve as it affects our plans we print out for our Ag Mech Show competitions. 

This can be the difference between 1st and 5th places at some of our shows. 

[throttle1253Z225]

Can you post your skeleton sketch and give some ideas of what exactly you are trying to achieve?

[benjamin_burkhalter]

This is a version of a trailer we are working on for next year. 

[blandb]

Thanks for posting, but we need more than just the assembly. Assemblies are nothing more than a file that links a bunch of parts or sub-assemblies together. Please either do a pack and go if it is a full assembly, or just attach the skeletion.ipt along with the assembly if that is all that is in it.

[benjamin_burkhalter]

Here is the wire frame.  I didn't draw this correctly from the start I know. 

The upright main beams should be a solid line not 2 seperate ones that the neck hangs from.  

[blandb]

Can you share an image of the result you get?

[Ray_Feiler]

gooseneck trailer - Recent models | 3D CAD Model Collection | GrabCAD Community Library

https://grabcad.com/library?page=1&time=all_time&sort=recent&query=gooseneck%20trailer

[benjamin_burkhalter]

This is what I wound up with on the last one.  I can't get the neck to mount on the uprights correctly. 

I need one that I can show how to draw and change out the frame members for each application. 

the neck is a compound triangular shape.  From the uprights it is  20 degrees inward 55 to 60 inches forward then tunning down on a 30 degree downward  terminating on a 6 and 5/8 Inch coupler sleeve or a 4x4 heavy wall sleeve on a corresponding 60 degree angle. The downturn of the neck eliminates most of the need for gussets on the weldup for the coupler Sleeve.

[JDMather]

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@benjamin_burkhalter wrote:

....our Ag Mech Show competitions. 

This can be the difference between 1st and 5th places at some of our shows. 

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@benjamin_burkhalter 

Let's go for First Place award, complete design including FEA analysis of the frame.

https://www.youtube.com/watch?v=1IV2kFkgBRc&list=PLp5izJt_zvN0KUccGh5OrgbNTZ_c4vYxs&index=12

Step 1. Create a new folder named Goose Neck Trailer.

Step 2. Create a New Project within the folder and name the project as Goose Neck Trailer.ipj

Make sure to select the path to the folder Goose Neck Trailer that we created in Step 1.

Step 3. 

Create a new part file and name it Goose Neck Trailer - Skeleton.ipt

Right click on the Goose Neck Trailer Folder and select Send to Compressed (zipped) folder and then Attach the resulting *.zip file here.

Q1. I don't understand these 24 inch dimensions relative to the image that you posted.  Are you modifying this design?

[benjamin_burkhalter]

The 24 inch dimensions were for a stacked box frame that would support individual hay cradles. The box frame allows for use of lighter weight/thickness structural tube steel. We shelved the idea due to building time constraints for this year.

[JDMather]

@benjamin_burkhalter 

Attach your project folder here when you are ready to start on simplified design...

[JDMather]

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@benjamin_burkhalter wrote:

I am sure  there is a simple process that I haven't discovered. 

Seriously, I need help. I have been trying to figure this out for years. 

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@benjamin_burkhalter 

Where did you go?

The first 3 steps that I outlined should take less than 3 minutes.

[benjamin_burkhalter]

Sorry, I teach all day. I don't always get to jump on something quickly . My time comes and goes with the classes and the schedual I am on.

[benjamin_burkhalter]

See if this worked

[JDMather]

@benjamin_burkhalter 

You went beyond my instructions - I was expecting an empty *.ipt file.

I would never repeat dimensions like this...

We will make use of obvious symmetry about the Origin.

Let's start with a circle at the Origin.

Then sketch a Construction Centerline from the Origin to the right.

Now sketch a Two Point Rectangle anywhere in space.

Add a Coincident constraint between the right end of the Construction Centerline and the Midpoint of the vertical line in the rectangle as shown.

Add the dimensions as shown.

Attach the new *.ipt file here for next set of steps.

Q2. Is this vertical pipe round or square?

(The pipe welded to the trailer frame.)

If it is cylindrical - what outside diameter?

If square - what outside size?

[benjamin_burkhalter]

I am back to the trailer drawing project once again.

I managed to get one wire frame to assembly with a semi correct gooseneck.

But I still missed a step drawing and constraining, in that I cant resize the trailer and the neck automatically adjust.

I have students with the funding to build a lowboy but I need to fix this frame where I can resize the length and width.

I can resize the main frame but it won't resize the neck width respectively.

[blandb]

First thing I see is the highlighted below...

If the top dim is supposed to keep the trailer centered then either use a vertical/horizontal constraint to geometrically lock in in position, or do a mathematical operation to make it the width/2. Sketch 2, is this always going to be the same width as the trailer or do you want to control that independently? If always the same, then just project the corners of the trailer, or make the width equal to sketch 1 width. IF not, just make sure to edit that dim.  The first 3d sketch is Empty?  is the top of the gooseneck supposed to be parallel with earth or does it slope down a few degrees as shown?

You could do this with a user work plane that you can either control the tilt if it needs to be sloped, or just make it parallel with the ground. Then repeat for the next section. vs a 3d sketch?

See a quick fixed version, you can always just rotate the top plane down a few degrees if needed. the top goose neck dims are just preliminary, you need to make them what you want. But it all updates.

Also, your sketch 1, is there suppose to be a mis-alignment from the origin to your corner of your frame? 

12 x 24 = 288, but you have 287.989?

[benjamin_burkhalter]

The neck is supposed to be 90 Deg to the neck legs off the main trailer frame.  The neck then runs 60" +/- 5" forward then turns down on a 30 degree cut.  This gives you a larger sectional cut of 60 degrees at the end to weld the ball hitch receiver tube too, often eliminating the need for gusset plates. 

The neck will then get gussets at the 30 deg turn, and on both sides of the neck legs. Size is variable. 

I am barely decent at 2d drawing and only once have I been somewhat successful at 3d on a neck.  I still have trouble getting a work plane to be in the correct orientation after I start with the first one. Sometimes I get lucky and the program offers one initially where I need to do the next sketch, but rarely.   But I have never understood all the constraints and how to utilize them to permanently tie the neck to the frame so that: 1 I can show my students how, and 2 I don't have to redraw every trailer I come up with.  1 wire frame that is constrained so that I can resize the length and width as needed would be awesome.  The length of the neck will only vary slightly in order to maintain a 90" center of ball to front of the neck leg spacing. That provides adequate clearance for most trucks to hook up without interference. 

I kick myself for not taking Autocad in college when I was more studious.  

[chris]

I've designed several trailers from Well Stimulation projects. This should be an easy set-up, although I have never used a skel to model them. What are the 5 main issues you are having? 

[benjamin_burkhalter]

I saw that you fixed the one.  Thank you. 

I am attaching another that I stumbled through.  How can I get the 30 degree downturn on the neck using work planes.  My brain thinks in 3D easy enough but my ability to transfer the vision in my head to on the screen is severely retarded....