Removable handles and removable handle end caps are removed by unscrewing them. Whilst this means that the handle can’t be replaced with a breast plate, it allows the hollow hole inside the handle to be larger, and so accommodate more drill bits. Some handles only have a removable end cap to the handle. The advantage of this is that you always have spare bits with you and there is no need to carry an additional case or box for spare bits. Secondly, some removable handles are hollow, allowing you to store spare drill bits in them. Firstly, it may allow you to replace the handle with a breast plate, which will enable you to apply more pressure when drilling hard materials such as metal. There are two reasons why you may wish to purchase a hand drill which has a removable handle. Rolling objects produce less friction than sliding ones think rolling a tyre across the ground instead of dragging it.Īs one of the bearing shells rotates, it causes the balls within it to spin, thus reducing the friction that is transferred to the other shell of the bearing.īy reducing the friction, a ball bearing gives a smoother turning motion and reduces the effort required to turn a brace. The round balls allow either the outer or inner shell to rotate whilst leaving the other stationary. It does make for a smoother turning action of the brace, however, which will make drilling easier.Ī ball bearing consists of an outer and inner shell or race with a series of round balls trapped between them. Like the double pinion, having a ball bearing head on a brace is not an essential feature. If, on the other hand, you want to use auger bits with a square shank and also be able to use round shank drill bits with the same brace, you will need a brace with a 4 jaw chuck. If you will only be using one type of drill bit, then a 4 jaw chuck is not required. Higher turning ratios and speeds are usually achieved by having either a larger drive wheel or smaller pinion gear on the hand drill. High turning ratios create high speed and low torque, whereas low turning ratios give low speed but higher torque.ĭrills with 2 speeds will have two turning ratios, one for the high speed setting and one for the low speed setting. The higher the turning ratio, the faster the drill bit will spin. So if a hand drill is advertised as having a turning ratio of 5 1/2:1 then the chuck will spin five and a half times for every one complete turn of the drive wheel. The turning ratio is the relationship between how many times the drill will spin the chuck for each complete turn of the drive wheel. Hand drills are sometimes advertised with one or two turning ratios given. The high speed low torque setting will enable you to drill small holes or drive small screws quickly, saving time on the job, while the low speed high torque setting will make drilling larger holes or driving longer screws easier. Having 2 speeds on your hand drill is a useful feature if you will be using it for drilling holes or driving screws of many different sizes. However, if you know that most of the time you will be using a hand drill where a ratchet mechanism is required, then a 5 way ratchet will be quicker due to the double ratchet feature.īraces with fully enclosed ratchet mechanisms are less likely to clog with dirt or wood shavings and will last longer.Ī double pinion is not an essential feature, but if you plan on using your hand drill a lot then having a double pinion will make it smoother to operate and drilling or driving in screws will be easier. If you are working in a confined area where it may not be possible to fully turn the handle of the brace or hand drill, then a ratchet is an essential feature.Ī 3 way or reversible ratchet is the most common and should be sufficient. By selecting a tool with the features you will need, you can make the job you are doing much easier and quicker, whilst eliminating features that are not needed can save you money on the purchase of the tool. There are many features that a hand drill or brace may have.
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