It’s sturdier because of this, and is better for drilling through harder materials. Mechanics Length, Reduced Shank, and Screw Machine Length all refer to the length of the Jobber itself.Ī Mechanics Length set is shorter in the flute than the average Jobber. Metric uses standard metric measurements. Wire Sizes are another set of measurements starting at 1 and then increasing by whole numbers. In other words you can have a size 1 through 80 or a size A through Z. Number and Letter Sizes measure their bits in…well…numbers or letters. The length of the bit size is recorded as irreducible fractions (Such as 1 7/32 instead of 39/32). In other words, it’s just different ways to describe how wide the bit is.įractional bit sizes measure bit size in increments of 1/64 inch up to 1 inch, 1/16 inch to 3 inches, 1/8 inch up to 3 ¼ inch, and just one more ¼ inch increment to 3 ½ inches. Fractional, Letter, Metric, and Wire all refer to the measurement systems used for Jobbers of regular length. The sizes can be especially confusing, so here’s a quick rundown. When shopping for a jobber, there are a wide variety of material, manufacture, and sizes. It also refers to someone who is contracted to lose a professional wrestling match, but that’s another post entirely. Generally speaking, the length of a jobber flute is 8-12 times the diameter of the drill bit. They are probably the most common type of drill bit on the market today. Hilarious.īut they are also wonderful, useful tools. Tweet The Difference Between Jobber Drill Bit Sizes Posted on Wednesday, August 17th, 2011 at 10:14 pm. weekend-warriors make a fork in the road and the high/low $$$ choice is apparent.įor heavy users, bits (aka drills UK) are use and scrap items.įor metal work, good drill bits make life far easier and more porductive.The Difference Between Jobber Drill Bit Sizes At least until they make them shittier.ĭrilling plate steel, bolts or hardened metal with them can be less than fun.ĭrill out spot welds and that is even higher on the suck scale. I have a drill bit sharpener so no bits daunt me, but the HF set for wood, plastic, alum, and sheet metal normally are a good value. (Well more than 2 now LOLZ>)ġ18 degree or 135 split point for wood/plastic. Norseman bits (can even get them from Epsteins) are at the top too. We get USA Dormer bits from our supplier and I am happy with them. Wood and plastics are much softer thusly they are more forgiving and less stressful on a bit. The big question is what are you going to be drilling? I'm a big fan of not having to constantly run out for this or that, and liked the inexpensive comprehensive sets.Īnyhow, the flimsy sheet metal cases on these really aren't great, and I wanted to snag something heftier/sturdier before these ones open up all over my shop floor. I know that HF and other import drill bits take a lot of flack, but these are relatively cheap for what they are, and my thought process here was to have these, and then replace, as needed, with quality/better bits where it counts. Figured the cobalts would be for metal drilling stuffs, and the titanium-nitride for the rest of it. I didn't have any kind of comprehensive set of bits, and picked these up tonight at some deep discounts - 25% off coupon and some in-store sales stuff that was going on. So, my next question would be, what length would you assume these are:
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