Looking pretty bombproof BigD. FWIW, I looked through the FIA regs and they regard the bend in the belt bar as totally kosher so I'm not sure why lemons is mostly opposed to them. I've got a race next month and I'll ask then. That guy's cage... Too bad it went that way but we've all seen cars wreck ...

Muriatic acid and hydrochloric acid are the same kind of acid but they still name them diferent because one of them is watered down and not as strong. Any acid strong enough to remove mill flake will likely be strong enough to eat away at the base metal leaving the risk of chemical stress induced i...

Dare I say... Weld it back together with some bronze.

-Sandow

Muriatic acid is the 16th century name for hydrochloric acid. Thats ok though, I still prefer to think of my electrodes as being Wolfram

-Sandow

That makes sense. There would be way more non-linearity in the flow rates the way I was thinking.

-Sandow

Have any of you had success using acids for stripping mill scale and light red rust? I've been playing with phosphoric acid and hydrochloric acid and they both have their merits but I'm not entirely satisfied with either. Are there any other acids or mixes of acids that are worth trying?

-Sandow

Crack it slowly at first to avoid problems but the ball will pop up on that type of regulator and that is normal. You just don't want it slamming to the top. You may have noticed the dial flowmeter spiking too, same deal. They are going from atmospheric pressure to thousands of PSI after all. The fl...

Without measuring the plug I couldn't tell you if these will fit but this style of connector is called an aviation plug. http://www.amazon.com/uxcell-Thread-Aviation-Connector-10Pairs/dp/B015K3Z5AG/ref=sr_1_1?ie=UTF8&qid=1458325721&sr=8-1&keywords=5+pin+aviation+connector Your pin outs f...

One real difference with 4130 though: "Unlike other materials that are high strength the BS 4T45 tube does not require any pre nor post heat treatments. Unlike other material such as 4130 / 25CRMO4 Chrome Moly, which are close in terms of mechanical strengths but not chemical makeup, do require...

The different SLA resins have different properties. The clear is very ridged but can be brittle as a result. This is a thick enough print that I seriously doubt is would have problems is it was dropped from any reasonable height though. The tough resin is flexible but not stretchy and would likely j...

PlasmaBrain wrote:Mg should spark out with a nice blinding white spark.

Followed by an unextinguishable flame

So I thought I'd follow up after I'd had a chance to use this for a bit. There are holes for 1/8", 3/32" and 1/16" and 4 angles per tungsten size. Seems to range from about 2:1 to 5:1. Not sure why you'd ever actually want 5:1 on a 1/8" tungsten but it is there if you want it. So...

Might be magnesium fill too. Dip some in distilled vinegar and see if it reacts.

-Sandow

Don't expect the technique to be magically perfect the first time around. It takes a bit of getting used to but can be really handy for things like vertical fillets. Try it without the arc on a few times to get the motion down and it may feel pretty natural before long. FWIW, I like using a cup larg...

Not exactly easy to control and the post flow needs to be longer than my machine allows but it works ok.

https://m.youtube.com/watch?v=AsO8xD_nD54
-Sandow

Yeah... I had to try it

Seems to shield just fine though the tungsten is a little off center. I puddled some 304 and it stayed uncolored on top and about a nickel size rainbow on the back. I'll try and get some video later.

-Sandow

Two more ideas... one I only suggest cause it would look absurd... This might get you in there: http://www.amazon.com/TIG-Welding-Torch-20-25/dp/B00KB9WZKS/ref=sr_1_5?ie=UTF8&qid=1458160254&sr=8-5&keywords=extra+long+tig+cup And for the clown college solution, slide a really long glass t...

Put another magnet on the inside. Aluminum isn't magnetic which means it isn't a magnetic shield either. http://www.amazon.com/CMS-Magnetics®-Neodymium-Magnet-Cylinder/dp/B000TK96GU/ref=sr_1_12?ie=UTF8&qid=1458158936&sr=8-12&keywords=neodymium+magnets Magnets this strong will screw with ...

Well squaring off tubing would seem to be a job for a lathe if you really want it 90 degrees. You can do a pretty good job with a chop saw that has been adjusted square though. Getting down in there for the last pipe may be the realm of something like this: http://www.ckworldwide.com/180-amps-ck180....

Also, I was really thinking about getting rid of DOM completely and switching to CDS tubing. The CDS is more money but I hate how dirty and inconsistent DOM is. Saving some time on prep could easily balance the extra cost. I'd never run across CDS before and it took a while to find up front pricing...

AFR, nice looking assembly. What are you using to clean the DOM tubing with?

-Sandow

I was thinking more of these: IMG_1237.PNG My experience repairing castings is limited to fixing crap around the track so maybe I've just never come across it before but these look like partial thickness stress fractures. No idea if they really matter or if they are just a common casting imperfectio...

http://uploads.tapatalk-cdn.com/20160315/79aa5bec268839415c9fddaf6ddd93b3.jpg Another view of the starter snout area, you can see the drilled hole better here. Curtis Epic repair! This looks like a spider web of stress fractures though. If that is isolated to this area, I wonder if running a bead a...

Well, a lot of this is going to be a swag but I'd think the motor should be fine but obviously you need to take precautions about fuel and fumes. I've welded on plenty of cars with everything still connected and never had an issue. The welding is going to fry paint in a pretty decent radius. I'd cle...

Yes, sorry forgot to mention those, thats my next order of business with the gusset bars. Yeah Chump is supposed to be contact free but a big chunk of the field has never seen a race track before and it's a tossup when you engage someone. Which sucks because our car was very well finished, fresh pa...