busting myths about power tools

1.
The memory effect in the NiCad battery first of all, I would like to talk about the \"memory effect\" that the NiCad battery and a lot of people are talking about \".
The memory effect occurs only when the battery is partially discharged to a specific precise voltage after charging.
This process causes active elements within the cell to gather together to form larger blocks, thus reducing the active surface area of energy storage.
The electric tool battery is not affected by memory effect due to irregular load, irregular charging and discharge cycle.
This does not exist in the power tool battery.
There are at least a dozen reasons for the NiCad battery\'s loss of capacity, and laymen always blame it on the memory effect.
Power tools will not be affected. 2.
In addition to making real Mutian replacement parts, the company took the lead in bringing NiMH batteries to the mainstream, but never succeeded in convincing other manufacturers to move on.
One of the pitches has no \"memory effect.
Read the first point about this.
NiMH cells are great, they are light and have a higher energy density (2.
4 Ah NiCad is the same size as 3 Ah NiMH)
Relatively cheap and long lasting.
One problem, however, is self.
Discharge rate and maximum current.
NiMH cell
The discharge speed is almost twice that of NiCad, and it cannot provide the high current that NiCad can provide.
NiMH batteries are also about 30% less charged than NiCad batteries.
Discharge cycle. 3.
Not all lithium-ion batteries are the same.
There are hundreds of different chemicals, all of which have different properties.
DeWalt used lithium ion nano-phosphate or lithium chemistry in their 14.
4/18/28/36 V nano battery with long life (
15% capacity loss after charging 1000-
Discharge cycle)
Very high current (
70 amps per battery for 10 seconds 120 amps)Very safe (
Slow exhaust in case of perforation or 100% short)
Resistant to overcharge, medium energy density (1.
1 Ah, 2, 18mm cells.
26mm communities 3 AH). Same cells (18mm)
For the Black and Decker VPX series.
Mutian, Ritchie, Bosch, liyoubi, Panasonic, lithium battery
Manganese batteries with relatively long life (40-
Capacity loss after 60% cycles 500)
But not as good as DeWalt, the discharge current is moderate (
15 Am Peres per grid)
Moderate safety (
Can detonate if short circuit or overcharge).
Don\'t tolerate overcharging and poor performance in cold weather.
Use lithium in Milwaukee
Manganese oxide
Allows very high density cell-based (
3 Ah per 26mm communities)
High discharge current (20 Amperes)
And fair battery life (
Capacity loss 6% after 50 cycles).
To sum up, Dewei is the most durable and powerful battery with good ability, the highest capacity/weight ratio and the shortest life span in Milwaukee, Maeda, Ritchie, Bosch, liyoubi, Panasonic, skil sits in the middle. 4.
When buying an impact Drive or drill bit, the torque rating will never trust what is said on the box.
The manufacturer usually measures the peak torque by pushing the screw into the pre-drilled hole of the steel until the bit/impact stops, and then using a torque wrench to unscrew the screw, measuring how much torque it takes to unscrew it.
This is not an accurate measure and is often exaggerated.
Mu Tian rated their LXT exercise as 560 in-
Lbs for 300 rpm and 450 in-lbs at 450 RPM.
If you ever try to drill using a large spiral bit or a big hole saw, you will see that the bit of the Makita is almost as fast as the dewalt keep s goes on until they screw your arm
This is partly due to the design of the battery, but the key is that Maeda is not more powerful than DeWalt.
You won\'t see any difference for regular day-to-day apps, but in extreme conditions DeWalt wins.
Do not make a purchase decision based on the instructions on the box, look at the price, battery type, voltage, weight and functionality. 5.
Brand bias purchased by many contractors 1-
Two tools for a particular brand, hear a bad story about another brand and make a clear decision not to buy the brand.
A lot of people attacked Delta or Porter cable, but praised DeWalt, even though the three were owned by Black & Decker.
Milwaukee, Ritchie, liyoubi Tektronic is one of the International/World Technologies.
Craftsmen can\'t even do their own tools;
From Maeda to Ridgid to hundreds of other manufacturers, they are all made by anyone.
People attacked craftsmen and then went to buy the same Mutian compressor or Ridgid Table Saw produced by the same factory.
Many people praise Festool because it is too \"good.
My personal point is that the tools they make work well, but they have a lot of plastic and fragile parts that crash on typical construction sites.
Makita\'s 15 Am pere reciprocating saw is much better in terms of performance and vibration than Milwaukee\'s Sawzall, but a lot of people insist on using Sawzall because it\'s \"historically\" good.
The Dewalt 18s 18B clamp saw is much better than any 18v clamp saw, but people bought the fragile Maeda LXT with an acrylic blade replacement rod.
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