mind_guy

Hey folks,

I've been interested for some time in building a frames as a hobby. My goal would be a few frames a year. I have a few years of welding experience ranging from AWS structural to TIG welded stainless tubing.

What is actually needed to get started to build quality frames? I've got my welding equipment mostly covered, but I do not have machines such as lathes, mills, etc. I've got a small garage shop, DC tig welder, portaband, grinders, stuff like that. I would be starting out doing steel frames, and maybe get a new machine if I ever dabble into AL.

I do understand that the first frame isn't going to be the best, but figured I'd reach out to the experts to get some guidance of if its something realistic for my space and my financial situation. What do you guys recommend for someone starting out as a tool list, including basic fixturing, so that a new builder might be successful.

Cheers.

Andrew R Stewart 

Many frames have been built with very simple tools. No real need for powered mitering unless you're going SS or Ti. Besides the usual fabrication shop stuff tubing holding blocks/clamps are a nice thing that will be used a lot. If you're building infrequently and have a flat surface that you're good trusting I suggest a tube holding set up based on that surface. Alex Meade makes some. The only real reason to have a formal jig is to quicken the build time. Many people will wait till after a few frames before shelling out the $ for a quality and useable jig.

My I ask where you are located? Some aspiring builders will take a building class of find a mentor to help them. Andy

mind_guy

I'm in Santa Cruz, CA, I've searched a bit and found a web page that has a list of local builders here, but haven't reached out to anyone due to human malware going around. For now I'll likely just be learning solo, but certainly would love to be mentored in the future. I've got a decent table, are you referring to his holding blocks? I would be curious to see basic holding setups as mentioned for ideas.

Thanks!

Andrew R Stewart 

m_g- Here's my Flicker site link. I have many build albums and tooling shots for the browsing. Andrew Stewart’s albums | Flickr Andy

guy153

I've made a few frames now with a TIG, a drill (for bottle cage and vent holes), an angle grinder and a digital angle box. From frame #00003 onwards I also had a laser level box which I highly recommend.

You will need some kind of basic fixturing but this can be homemade and does not have to be high precision if it's adjustable.

I do own a cheap tubing notcher but I actually prefer hand-mitring using templates. I just use a worn-out flap disk on the grinder.

​​​​You can use hand files (and saws) of course too. What I like about the grinder is you don't need to clamp the tube hardly at all. I ended up prepping so many practice joints with the grinder to save time that I got better at it so just use it for everything. I don't get absolutely perfect fit up and this is something I'm always trying to improve, but it's good enough.
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unterhausen

What do you use the laser level for?

guy153

Getting ST and HT in vertical planes in the jig and the dropouts centered and horizontal with respect to the ST. Then I can make sure the HT is on the centreline with string going back to the dropouts.
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mind_guy

Thanks for all the advise so far! It's great to hear about people getting the job done with what they have available to them.

guy153

There are a couple of TIG accessories that I would recommend. It's well worth having a number 9 torch (the small ones) with one of those supersoft red CK hoses, and you will certainly need a foot pedal. I don't use auto-pulse although some people like it. I've experimented with huge cups and lots of stickout but it doesn't work for me but maybe just because I'm too mean to crank the gas up enough. I use a No 8 cup for everything with 1/16" electrode. For the tight spots I use a big stickout but wrap tinfoil around the place to trap Argon and sort of fill the area up for a few seconds before starting. Fiddly but works well. And you will want a thin filler rod. I use 1mm but some people use really thin MIG wire.

guy153

The laser level in action:


The ST is vertical in the other plane as well (and will be tipped back to 73 degrees later). The vertical beam is lined up with the ST, the centre of the BB shell and the midpoint between the dropouts. The dummy axle is level. All good. So now I swing the ST down, leaving the laser where it is, and set up the HT:


Then I will swing things back to the right angles, get them in the right places, and check again.

mind_guy

Awesome! All of your tips are great to hear. I've actually incorporated a lot of the above in my toolbox.

I've got a CK 9 superflex, love the thing. My machine is a maxstar 150 STL so I'll be manually pulsing if needed.I've had good luck with Furick 12 cups myself, but on carbon steel a number 8 would be fine. I mostly only use the bigger cups are good for stainless where more gas is helpful. .045 wire is the smallest I have, but ill see if I can order smaller from my LWS if needed.

Doug Fattic 

Thanks for posting your laser procedure! I've been curious for hobbyists if this was a possible option. The other possibility is to make a surface table with MDF board and pour an epoxy top. I know that will work and am hoping someone will work out the details. I have both cast iron and aluminum tables so don't need these things myself but like proved options for those on limited budgets.

Cynikal 

I've been curious about using a laser for alignment as well. Can you show a photo or a link to your laser?

dsaul

ER312 in .035 is what I use for all of my steel frames. The Furick Jazzy 10 is a good all around cup for framebuilding.

guy153

This is the one I use (which is probably only available in the UK but you can get similar things everywhere).

You can mount it on a camera tripod but I made my own adjustable height stand. Adjustable height is useful so you can get the horizontal line at the right height.

https://www.screwfix.com/p/magnusson...&gclsrc=aw.ds#

guy153

Why ER312? I've noticed some people use various stainless rods but never known why. I just use ER70-S either 2 or 6 I can't remember which.

dsaul

It seems to flow better than ER70S2 and I can use it for welding dissimilar metals like stainless dropouts to chromoly stays. Weldmold 880 is popular with framebuilders, but I believe that ER312 is the same stuff and costs less.

Cynikal 

Thanks. Now that I see it, it makes sense. I'll look into one.

guy153

Maybe the link only works in the UK or something! Here's a screenshot, you get the idea:



Only about £40.

guy153

Trapping Argon around the bottom of the DT to HT junction. The angle here is tighter than it looks in the picture. With the foil there and a few seconds of "pre-flow" (actually achieved by arcing off the foil very briefly and waiting for the post-flow as my machine doesn't have a pre-flow) the region fills up with enough gas to mean you can take some big liberties with the amount of stickout. It also helps to put foil in the end of the HT because splitting the flow of Argon on an edge like that always seems to cause problems. This is probably the second hardest part of the frame to reach after the CS to BB junction which also always needs foil

bulgie 

Do you use a gas lens? If no, have you tried one and decided against it? I couldn't imagine going back after using one.

It's a must with Ti, but pretty useful for steel too. I welded more Ti than steel, and only really welded steel frames after I was already doing Ti, so I just used the same torch and the same gas lens for steel, and I liked it. I'd recommend the "large" lens and big cup to match, then you can get away with shocking amounts of stickout.

For those who don't know, a gas lens makes the argon flow laminar, which means no turbulence. The turbulence you get without a lens sucks in air from the surroundings. This video from Miller shows it pretty well: Notice how the length of the laminar flow region gets shorter as the gas flow (cfh) goes up, which can be counter-intuitive. So if you're getting air coloring your weld, it can help to turn the argon flow down. Note also how the length of the laminar flow region goes up as the cup size (diameter and length) go up, so try the biggest cup you think you can fit in there..

Even with the lens, there were still places where I'd build a foil dam for Ti, but under the DT/HT joint wasn't one of them. The lens seemed adequate to me for that spot, even with Ti. I also welded with a plug ("heat sink") in the end of the HT, but that was more for back-purging, not really a heat-sink per se. Same as with the gas lens, I started doing that plug and back-purge thing for Ti, and just kept doing it the same way for steel because I liked the results.

Past-tense because I haven't welded a bike in over 20 years, so my advice is old and maybe obsolete.

Mark B in Seattle

guy153

I am using a gas lens with a No 8 cup, and about 10lpm which is about 20cfh, but I go to 12lpm if I'm in one of these tricky spots with extra stickout needed. I've tried a much bigger cup with more stickout but I found the big cup gets in the way and you need even more stickout... so kind of a vicious circle. Maybe my big cup is too big. You also always need some pre-flow with that setup because there's such a big space you're trying to fill up with gas.

I used the foil in three places: bottom of DT/HT, where the ST joins the DT, and CS to BB shell. ST/DT I probably could have got away without it and possibly DT/HT as well but I dunno... it was quite a lot of stickout. Never tried backpurging as not attempted stainless or Ti, but I know some people do use it for CrMo as well.

How did you manage the back of the SS to ST on a road-style frame with a horizontal TT and quite a long ST with is about 30mm diameter at the top? That's like a 57 degree angle and with the two stays very close together. I've found it's basically impossible to reach inside there, but I can TIG braze it. I make a bigger fillet that's sort of bridging across a bit (which means I can reach it) and then I can zap the fillet with the torch and it kind of falls in. Actually seems to work quite well.

dsaul

20cfh is too high for an 8 cup with a gas lens. I stick with around 15cfh for an 8 cup, because any higher and the turbulence from the high flow causes it to pull atmospheric gases into the flow and cause fireworks. I use the Furick Jazzy 10 with 20cfh and I can stick out around an inch or more of tungsten with no issues and no foil. I welded this yesterday with the Jazzy 10 and no foil was necessary.

guy153

That's a very nice looking weld in one of the hardest spots. I have a bit of work before I reach your level but I'm still improving and I'm really pleased with how the frame I'm working on has turned out so far. I don't know if I'm really running exactly 20CFH because I use the regulator that comes on the Albee gas cylinders which is fairly approximate. Obviously any fireworks are considered harmful.

Getting a really nice consistent looking weld like that starts with good fit-up.

mind_guy

I bigger cup allows for a longer stick out, which is awesome for getting into those acute angle joints. I've made a few rocket stoves recently out of stainless and a #12 furick was the only way to get in there without AL dams. I'll have to check out the jazzy 10 sometime.