Saturday, July 7, 2012

Drill Bits Emergency Production Post #1

Understanding a drill bit could be useful in an emergency. People look at machine tools as the more complicated type but many people own a very fine machine tool in a drill press or a hand drill. This could be a table top model or a floor standing model drill press less usable is a hand drill. In either case they can be used to mass produce parts.  Mass production of parts is not limited to drilling a hole but would include: counter-boring, counter-sinks, sanding, honing, reaming, lapping and tapping threads which I will cover with greater explanations in another post. Speed of the spinning bit is important to tool life as well as feed. The speed adjustments are done by adjusting the fan-belts at the top, on the pulleys and feed is controlled by hand pressure. You can also control the depth of the hole by an adjustment on the side of most standing drill presses. The bit should be inserted so it continually cuts because if it is allowed to spin and rub without cutting  then it generates heat and accomplishes nothing other than softening the cutting tool tip. Mass production of parts requires the tool operator to take his or her time and align the tool exactly each time. A center punch is used to make a dent so the bit starts where you want it to, otherwise it could start where you do not want it to. We will discuss what a drill press can do in another post as well as how jigs are useful in mass production as it allows for the quick alignment of the part and a quicker change of  the part.
  You can see people sharpening drill bits on the internet that have been doing it for 25 years and they make it look easy, but if you are new at it you need to duplicate the angle. Use a piece of solid cardboard use a ruler and draw a straight line. Lay the side of the drill bit on the line. Now draw the angled line at the top intersecting the first line. now use your ruler and make the second line at least 1& 1/2 inches long. Cut out the cardboard and you now have an alignment tool to check your work. It is critical to make the sweeping angle up to the cutting edge on both sides. This is done by rolling the drill bit against the grinding wheel. Given that you are new at it you will need to practice. Use a spray paint can plastic lid with water in it to keep the bit cool-- if it gets too hot then you will have a soft tip. The bit must never get hot enough to sizzle.  When you think you having it look like an unshapely bit put it in your card-board angle gauge one last time and mark the chisel point location on the cardboard. now turn the bit half way and check the chisel's point against your mark if it is not correct regrind the short side slightly and check again. If the chisel bit is not in the center then the bit will drill a larger hole. On very small bits you just do the best you can. To see the next post click here 
 Richard W Norman 

If they pass laws against guns then you will either make your supplies at home, salvage or do without. Below 1) Tactics Techniques and Concepts of Anti-armor Warfare historical training manual 2) KFM Fallout Radiation Meter Kit Instructions This is a home made fallout meter developed during the cold war. They knew the public could not get a meter in an emergence so this was designed so anyone could build one with stuff you had around the house.3) US Ammunition Price list from 1912. Not just a neat document but it includes bullet weights and black powder charges for many old cartridges.  To see military e-manuals and gun e-books click here No waiting, get it now as an E-Book over 70 to chose from!

Anti-armor Infantry Tactics Techniques and ConceptsHomemade KFM Fallout Radiation Meter KitUS Ammunition Price List for 1912

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