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| Thread ID: 142536 | 2016-07-19 07:43:00 | Ryobi or Black & Decker? | bk T (215) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1423363 | 2016-07-20 21:06:00 | the prices make me wince with pain. Youse guys get owned down there! I buy whereever is cheapest. One of the drills, via Amazon was the cheapest for a battery, NZ $48 inc shipping. |
pctek (84) | ||
| 1423364 | 2016-07-20 21:49:00 | Do NOT buy a 'clamshell' gun of any brand, price or battery prowess . These are the drills or drill motors that have the case screws that hold two halves of the gun together . A good quality gun will have a separable metal case transmission (reduction gears, really) at the front of the unit and the armature loads out through the same hole that the reduction gears cover . That advice could be straight out of Zen and the Art of Motorcycle Maintenance :) Personally I tend to follow pctech - the cheapest . I wanted a powered rasp for smoothing builders bog and got an Ozito multitool for only $80 incl the attachment . Worked great . The other brands were significantly more expensive and the rasp attachment was extra |
BBCmicro (15761) | ||
| 1423365 | 2016-07-20 21:58:00 | Use a good 12V drill, then use a good 18V drill, then you'll know why. voltage is irrelevant . Thats like saying US mains power drills have 1/2 they power of NZ equivalents . or NZ stereo's are twice as loud . :) Its the power rating of the motor & batt rating (max continuous current + voltage) that matter, more than just voltage 12v , 18v . Marketing . 12v is all thats needed to turn a large car engine . |
1101 (13337) | ||
| 1423366 | 2016-07-20 22:24:00 | voltage is irrelevant . Thats like saying US mains power drills have 1/2 they power of NZ equivalents . or NZ stereo's are twice as loud . :) Its the power rating of the motor & batt rating (max continuous current + voltage) that matter, more than just voltage 12v , 18v . Marketing . 12v is all thats needed to turn a large car engine . Interesting comment - given it seems eminently logical. I recently bought an 18v drill over a 12v on the basis that 'man-cave' law says more is better. Anyone care to refute this claim? I am interested given that I will buy more appliances of this ilk. |
allblack (6574) | ||
| 1423367 | 2016-07-20 22:43:00 | After reading all the above, I have re-considered my initial thoughts with this one: Ryobi (www.bunnings.co.nz) from bunnings. It weighs 3.0kg - don't you guys think it is too heavy? |
bk T (215) | ||
| 1423368 | 2016-07-20 23:34:00 | Bunnings??? Theyr'e AUSTRALIAN!!!! | Richard (739) | ||
| 1423369 | 2016-07-20 23:49:00 | After reading all the above, I have re-considered my initial thoughts with this one: Ryobi (www.bunnings.co.nz) from bunnings. It weighs 3.0kg - don't you guys think it is too heavy? Only if you are 9stone weakling.:) |
Cicero (40) | ||
| 1423370 | 2016-07-20 23:50:00 | Bunnings??? Theyr'e AUSTRALIAN!!!! I just love your encyclopaedic knowledge. |
Cicero (40) | ||
| 1423371 | 2016-07-20 23:55:00 | voltage is irrelevant . Thats like saying US mains power drills have 1/2 they power of NZ equivalents . or NZ stereo's are twice as loud . :) Its the power rating of the motor & batt rating (max continuous current + voltage) that matter, more than just voltage 12v , 18v . Marketing . 12v is all thats needed to turn a large car engine . Voltage is far from irrelevant when it comes to BATTERY powered tools. The cells commonly used for almost all of them have similar AH ratings. To get more power you need more cells - that's simple enough. Sure you could make a 12V drill with twice as many cells in parallel and use a motor designed to use more current to take advantage of it but manufacturers chose to add more cells in series instead and go for a higher voltage. This has the added advantage that it's easier to make a DC motor spin faster by adding voltage than by any other method, 18V drills tend to offer a higher RPM which is better for drilling in most cases. Also using more current to achieve more power can be problematic requiring heavier conductors and more expensive construction. 12V battery with 4AH (the higher end of cordless drills right now) = 48WH of energy available 18V battery with 4AH = 72WH of energy available (Much more common are batteries in the 1.3 - 2.5 AH range incidentally.) That's simple maths, if a 12V tool with a 6AH battery exists I haven't seen them. They certainly aren't common. Either way the batteries would be the same size, just configured differently so you might as well use the higher voltage for the faster RPM's. If you need more torque you can use reduction gearing to achieve it. If there was no point to higher voltages we would still be using 7.2V drills like the one I had 20 years ago - perfectly functional but not a serious contender against todays cordless tools. It's entirely possible a 240V drill could be twice as powerful as a 110V US one depending on design, the stereo example is foolish as they run typically on something like +/- 40V DC via a transformer and don't use AC mains voltages anyway. Car engines don't turn fast and you don't drill holes with a starter motor, you also don't carry around a lead acid battery capable of putting out hundreds of Amps to put a screw in. If US power points have the same 10A limit ours do then yes they are limited to half or less the power available, luckily most appliances don't need anywhere near the 2.4 KW we can get from ours, with a stereo typically using a few hundred watts at most. They need to use more current to achieve the same wattage, we use more voltage. |
dugimodo (138) | ||
| 1423372 | 2016-07-21 01:52:00 | :thumbs: nice explanation dugi | bevy121 (117) | ||
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