Goofs & Blunders You Should Avoid.

Do not center your piece from the off center hole but between edges or this will happen. Duh.:concerned:

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Glenn Brooks said:
Reading through the thread, saw a couple of posts about welding sparks pitting windshields on cars in the garage. This reminded me of a small welding project I did two or three summers ago. I always wear protective gear when cutting or welding -summer and winter. So took off a nice new fleece pullover, and put on my old leather welding jacket. Buttoned it up to the neck, doned the gloves and hood and went to work. About 10 minutes later I had welded the fixture up and took off the leather coat to put everything away. As I turned around, I noticed my nice new pull over fleece I had folded up and placed behind me on the ground, out of harms way, had turned into a small synthetic bonfire. The flames had burned a nice hole right thru the center of my garment, right down to the pavement. Somewhere along the line, welding sparks had somehow bounced into the fabric and ignited. I stamped the fire out. But holding up the pullover, could see nothing left except the arms, neck, and zipper, and a bunch of ragged, burnt and melted fabric around the edge of the garment, with avery large hole burned clean through the body.
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It would have been worse had you been wearing it at the time!
 
mephits said:
Also true, but there we're talking about an automotive electrical system. Much lower wattage than an EDM. On top of that, if you're getting sparks in your motor, it's destroying itself. Those sparks will erode the commutator and rotor just like they erode metal in the EDM.

Interesting. So the EDM doesn't push enough wattage to crack the water into free hydrogen and oxygen? That would create a whole new set of flammability issues!
Cost?
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Re: the in-tank fuel pumps, my first encounter was with a Chevrolet Vega and I wondered about them at the time. As I recall, all brush type motors create sparks, regardless of size or power. If I recall correctly, the brushes weren't even enclosed to allow for gasoline cooling the motor. The saving grace is that the constant flow of gasoline cools the area so there is little possibility of vapor and there is no oxygen present. I don't recall if the pump sat in a sump so it couldn't ever be exposed to air.

Re: the EDM process in water probably does break water into hydrogen and oxygen. However you have fuel, oxygen, and ignition source in the immediate vicinity. They would spontaneously be combined to produce water vapor which would be condensed to water again.
 
OK, RJ you are dating things, I use to have a Vega, There was a small sump area but not that big. That stupid plastic screen kept clogging up on mine, what was the use of the fuel filter when it could not get that far. Of course I would swear someone put something in my gas tank just to p___ me off. But at least it was not as bad a trying to put a fuel pump in the tank of a Ford Aerostar when it quite just after you filled it up. I would swear I smelled like gas for 2 days, on that road trip.
 
brino said:
There were some comments above about removing swarf.
Here's a shot of the acid brush I use to remove swarf and apply cutting oil to the work area:
View attachment 141751

The milling cutter grabbed it, pulled it thru and spit it out the other side.
I am so glad it wasn't my fingers.

I still use it.....keeping it as a reminder......

-brino
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It looks like you can get a better grip on that brush now.

Kevin J
 
When turning on a lathe (especially close to the chuck) make sure you know which lever disengaged the carriage feed. I was turning a piece of 9" od aluminum and was almost to the end of my cut so I reached down and grabbed a lever to be ready. Turns out it was the cross slide lever. So I ended up running my tool into the chuck jaws before I even noticed I had the wrong one.

Long and short of it; pay attention to what you are doing at ALL times.
 
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Be careful when using a 4-1/2" angle grinder with a stiff wire brush wheel on it.
Last spring I was at work making the bearing adjustment nuts in the first pic and had to clean up the bur on the threads. I didn't really have a good way of doing it available, but I had a grinder.
Using that was my first mistake. Using that wheel was my second. I was knelt down on a pallet with one of them standing up between my knees. I was holding it with one hand and running the grinder with the other. I was trying to stay in line with the threads but I got twisted just enough for the wheel to grab and pull the grinder out of my hand. Of course, it went flopping around like a fish and went right across my knee (second pic). Needless to say, I found a different, albeit slower, way to do it. Using both hands is not always easy (sometimes impossible) depending on the work, but a good grip, and proper wheel can prevent a lot of damage. Looking back, I can see numerous mistakes I made doing that, and I'll always have this scar across my knee to remind me.

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Kevin J said:
It looks like you can get a better grip on that brush now.

Kevin J
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They'll do the same thing thing to a shop vac hose. Found that out the hard way.

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Mach89 said:
Be careful when using a 4-1/2" angle grinder with a stiff wire brush wheel on it.
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Absolutely agreed!
I'd rank the knotted wire cup brush on my angle grinder second only to my chainsaw for most dangerous tools on the property.
Either will grab loose clothing and wrap it all around pulling you in.

The difference is the chain on the saw is further from the trigger and people have been trained not to hold what they are cutting with it.
With the grinder it seems like it should be controllable, but my experience has shown it is not!
You just need to catch a corner of the part your trying to clean and the tool is off in unexpected directions.

-brino
 
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