วันพฤหัสบดีที่ 1 กรกฎาคม พ.ศ. 2553

#$ Makita BHP451 LXT 18 Volt Lithium Ion Hammer Drill Driver



The Makita BHP451 is the top of the Makita 18 volt lithium-ion powered hand drill lineup and despite its 2 speed gearbox should provide great performance. Overall it is a very good drill but the chuck is not the best (compared to Bosch or DeWalt) and the speed ranges are also less than optimum. It has 0-450 and 0-1700. For most tasks a 0-600, 0-1000, 0-2000 options like the DeWalt DCD970/940 drills works much better. The Makita BHP451 has in effect a low ranges and moderate high range.



The drill chuck has significant runout for a new drill and not nearly as good as those from DeWalt, Milwaukee, or Bosch with Bosch being in a league of its own. The chuck tends to hold drill bits well so long as they are smaller than 3/8" or 10mm. When using larger drill bits or hole saw arbors if there is any vibration the chuck will loosen to the point that the bit or arbor falls out. This is when the DeWalt self-tightening chuck makes a real difference as it never lets go.



The second side handle can be rotated to any position like the DeWalt and Bosch drills and this makes it a lot more valuable when you really do need two hands to control the drill. The 90 degree side mount of the Milwaukee and Ridgid drills provide a lot less support for the drill.



I like the integrated drilling depth stop of the Makita. This is something that should be standard for all hammer drills but is usually omitted entirely -- you cannot even add one later if you want to with the hammer drills from DeWalt and Milwaukee).



The batteries charge in roughly 30 minutes on average and this is in the middle range as far as the other lithium-ion batteries and charger combinations from other manufacturers. A lot is made of how fast a battery recharges which misses the point. If the drill and battery are up to the task the battery will last and not require frequent recharging during the day. Faster charge times are likely to shorten the useful life of the battery so I for one would rather wait 10 more minutes and get an extra year or two of use out of the battery. Makita recommends that their 3 Ah batteries be charged and then left on the charger of another hour to cool them down before reusing them.



Battery charge life is greatly influenced by the hole cutter that is used - much more so than most people realize. I did a quick test by first charging the drill to 100% and then cutting a single 2" hole in 1-1/8" plywood and then timed how long it took to get the battery back up to full charge. By the time the hole has been cut, which took about 45 seconds, the wood was smoking. It took more than 20 minutes to get the battery back to a full charge. Using the Makita drill and a Blue Boar TCT hole cutter (my favorite hole saws) I cut a second 2" hole in the same board and it took only 4 seconds and the battery charge was hardly affected at all.



There are what my own experience has shown to be exaggerated claims on available drill torque and battery charge times while at the same time the manufacturers without exception don't appreciate how much the right hole cutter will improve the performance of their drills. They will rate their drills at 2" maximum hole saw size in wood or 1-7/8" with a self feed drill bit while missing entirely that the drills can make 6" holes with a modern big gullet hole saw (like the Blue Boar TCT or Milwaukee Big Hawg or Bosch TCHS) or even 10" diameter holes in TJI or wood with an adjustable hole cutter (like the ones from Hole Pro).



BLUE BOAR 3" (76mm) Super Duty Universal TCT 2-1/4" deep tungsten carbide hole saw cuts more materials faster than any other hole saw. Hard RA 90-91 carbide teeth for faster cutting and longer life, ultra deep side gullets for faster plug removal



Hole Pro X-230 Kit: 1-7/8" to 9" Infinitely Adjustable Twin Blade Hole Saw Cutter 3" 4" 5" 6" 7" 8" 9" Hole Wood Sheetrock Plaster Fiberglass Plastic MDF Cement Board. Use ¼ Torque of Hole Saw to Cut Twice As Fast



Milwaukee 49-56-9050 4-5/8-Inch Big Hawg Hole Cutter



Bosch HTC300 3-Inch 76mm TCHS Hole Saw



Many of the complaints about cordless drill performance are based on real experience but often without the user realizing that they were not using the drill so as to get the most performance possible from the tool. Cordless drills that depend upon a battery for power cannot be used the same way as a corded drill plugged into an outlet and get the same level of performance. The drawbacks of using a cordless drill can be largely overcome by using them with a bit more finesse and using modern hole cutters. I can make a larger hole in inch thick subflooring using an 18 volt cordless drill like the Makita BHP451 than I can using a bi-metal hole saw with a 15 amp corded stud drill.



People should focus less on "what is the best cordless drill" and more on what are best hole cutters to use with a cordless drill. They would save themselves money and time and aggravation. There is no best cordless drill as there are strengths and weaknesses with every manufacturers products and it is really a matter of what features are most important and which flaws you can easily overlook. Fortunately there is intense competition and as a result all the cordless tools keep getting better and better. For light duty use the Milwaukee 2602 (not the 2602CT) is a great drill and for heavy duty use the DeWalt drills cannot be beat but for Makita fans and light to medium jobs the BHP451 is a good performer.
(15 customers reviews)
Customers Rating=4.5 / 5.0

More Detail For Makita BHP451 LXT 18 Volt Lithium Ion Hammer Drill Driver


  • LXT Lithium-Ion battery and optimum charging system produces 280% more lifetime work with 2x more cycles.
  • 3-speed design produces 25% faster working speed with more efficiency-inch a wider range of applications
  • Shift Lock Driver System quickly shifts from in hammer drill-inch to in driver-inch mode with one touch
  • Ergonomic shape fits like a glove with even pressure and easy control
  • Compact design at only 9-7/8-inch length and weighs only 4.9-pounds for less operator fatigue

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