Okay, quick update on the rear bumper as there's some interesting things going on there.
While the point of the van is to be able to carry bikes inside, oh, and take the family places, my big GS is too tall to put inside without some major contortions. I've always dug the hitch mounted bike carriers but the few I've owned all gave me a queasy feeling as I watched my bike swaying in the wind. While I never lost a bike they don't inspire confidence.
Their main problem is that they use the central hitch - one point for a long motorcycle. That seems to not make much sense to me so my modifications to the bumper aim to fix that by making two points to eliminate sway.
First a word about receivers and tubing in general. Tubing is always made from flat stock and as such has a seam inside. Generally this isn't a problem and you probably never even knew of this tragedy until now. But it's true. If you try to nest two tubes you'll find that it never works. Receiver tubing though is made so one fits inside the other and the weld is flush. Like you see above.
First order of business is to drill the tube for the receiver pin. I want this to feel standard and be able to use the standard pins and such. So little by little I drill ever larger holes until I get it to 5/8" and my test pin fits.
Next, because the bumper isn't flat, I cut the tube to the 10 degrees and set it in the back up light opening and tack it in very lightly.
It's all kinds of wonky but now I need to cut some plate to fit in around the receiver and then tack that so I can start to make it a bit more strong.
It now has enough support that I can push, pull and force it into place. Namely to get the pair of them to be square and level.
The initial angle of the supports I took from the seams of the van body and zeroed by digital angle cube. This little ****** is about the fourth most useful tool in my shop. I don't use it much but when I need it it saves me a boat load of time. When it turns off it resets so now you're just seeing the angle of the driveway. I lifted each tube to get them to match and then measured how far apart they were at the bumper and at the ends to get them to be square.
Next up I ordered a swing out kit from
4x4Labs because it was what Ben had and I've quit questioning if Ben did his research - if he got it then I'll want it. We're bad like that. I could have built this spindle from scratch but I have enough going on. It was also eye opening how loose the tolerances where. I'm used to press fit bearings and these all slide in with a loose slip fit. It's sort of nice and it's only a spare tire carrier.
I usually like to really plan things out but I've been winging this bumper and I'm hoping it doesn't bite me in the ***. I will say that I'm enjoying the process of just making without much planning. So I drilled the hole for the spindle without much checking but more based on, "umm, yeah, that looks good" sort of reasoning.
As the hole came close to the face I had to machine a flat but that seemed like a nice way to index the post.
Then the post hit the side at it's 10 degree angle - I'm seeing a theme with the 10 degree thing. So I used my handy cube to tilt the mill head 10 degrees and machined off the end.
Easy Peazy but I was being impatient and opened the vise to pull the spindle before the mill had quit spinning - a no no somewhere in machining 101 - and the end mill touched the part and...
...the bumper just got a bit more expensive! That was my favorite roughing end mill too.
A quick note about "stock" - it's awesome. Every time I go to buy steel I tend to buy a few extra pieces. Each time I finish a project or cut up some steel I ferret away the small pieces into one of three places: shorts are those above - they fit into a bin. Mediums I keep in under the notcher and long stuff I keep in a rack over my head - which, let's be honest - doesn't make sense. My collection of shorts has completely filled the cabinet I made which thrills me to no end. I have a bin for springs, bearings, steel, stainless, brass, bronze. There's alway something and it saves me countless trips to the yard.
Seeing as my spare is 98lbs I welded up the inside of the end cap, welded the spindle to the bumper inside and outside and then dug in my mild steel bin and welded on two braces. I'm pretty sure the bumper will fail before this does but this sort of fab is out of my wheelhouse so it's an experiment and I'm trying to err on the side of "stronger than needed."
This has also been an amazing exercise in how welds move the metal and how to use that to your advantage and to control it.
The spindle wasn't square but by placing my first welds opposite of where it needed to move I got it to pull into square which was a first for me. I feel like I'm starting to "feel" the way welding works.
More scrap, already mitered. Since the weight of a bike will be pressing down the other side of the receiver will be wanting to lift so I put in a brace that will handle the compressive load.
And another scrap bracing the bumper bracket in compression.
And then I welded in a stop for the outer spindle housing. I haven't even figured out a design for the spare so this might be a mistake but I set it up for 180 of swing. If I need to limit it I'll modify the shell.
I kept moving the heat around, trying to balance the pull, and finish welded the receiver into the bumper.
I then ground the welds flat and primed it with POR-15. It was my first time using it and it's very popular with both car guys and hobby machinists who refinish old tools. At the auto parts store the women who sold it to me told me it's "really strong. Incredibly strong. Like don't put the lid on without cleaning it completely" and she was not joking.
I cleaned that can and the lid really well before putting the cap on and in the week between bumpers that lid was sealed shut. I had to destroy the can to get the lid off. I don't know what the hell is in it but it's some seriously tenacious ****.
On top of that I used Duplicolor Bed Liner for a textured finish reminiscent of a knockdown finish on drywall. I could have sent the bumpers out for powder but then, when I want to weld a bracket on or make a mount or whatever it would have to be done again. Now I can just knock it back with a grinder, make the mods and spray it back and be good to go. This van is about utility and I like having one type of paint that is used for everything I plan on adding - roof rack, bumpers and lower belt line. I'm even thinking I'll do the wheels as well as I don't really care for them being flat black and I like the textured satin of this ben liner.
Lastly is my new way of cleaning the shop.
I gather all the tools and pile them onto my work bench. It makes it impossible to work unless I put them all away and I find it easy to gather all the sockets in one trip, the wrenches in another, etc. It seems to go faster as well. I think it's the same methodology as piling dishes in the sink. Not sure that's the right analogy but it is working and the shop is cleaner this year.
Anyway. That is it for the moment. I am going to mount up the bumper and deal with the spare tire when I have a better idea of how to tackle it.
I'll try to get some final photos of it on the van later.
Gregor