Richard
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They’re right about the molded on parts. Although there isn’t a whole lot of ways to put those on unfortunately like stated steel and fiberglass expand and contract differently. Andto be honest I have never not seen this methods not fail over a couple years. In the end the work ends up costing you more than full glass fenders would have.
Best of luck on your results there Jimmo.
I hate how much bull filler they have in those tests. You’re stuck thinking “what is the answer they want” rather than what is the correct answer.
like they’re probably asking about standard twist drills rather than actual spot weld drills. Because the people that wrote it don’t know a difference, or because the questions to this test are older than what is standardized today.Ben is correct.
Most standard twist drills used for spot metal cutting are high to extra high clearance angle bits. meaning they are typically around 130-145 degree’s.
Compared to what is considered an average universal drill which is a low clearance angle bit containing a 118 degree clearance angle.High Clearance twist drills are typically used simply for the fact that they have a highly pronounced sharp chisel edge, and a very low profile cutting edge.
This basically means that the bit digs in fast, and cuts with as much surface as possible at once
This leads to more “Chipping” which means you’re taking more material out in less turns. Which equals less heat, which results in longer cutting life as well as a stronger bit, because more of the bit is doing the work at once.Unfortunately high clearance bits have virtually no self centering capability, as well as produce some of the least precise holes of many other angles and bit styles.
Some of the more specialty sheet metal cutters with the centering point on them rather than a chisel can go all the way up to a negative angle 182 Degree’s. (Although quite precise, These lose their initial cutting edge fast. thus are less common, making them more expensive.)
So the answer to your question, is that this test is straight up dinosaur age questions, and they ain’t got a clue what they’re talking about.
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