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AC adapter for cordless power tools?

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HaRuMaN:

--- Quote from: pinballjim on January 22, 2010, 03:14:10 pm ---How about you guys just admit that ahofle proved all of you wrong already?

--- End quote ---

How so?

Ed_McCarron:

--- Quote from: pinballjim on January 22, 2010, 03:14:10 pm ---How about you guys just admit that ahofle proved all of you wrong already?



--- End quote ---

Put a 1/2" bit in and drill through a piece of 1/4" steel.  Report back.

Then we'll decide who's been proven wrong. :)

ahofle:
I will do some more tests and report back (don't know if I have any 1/4" steel scraps laying around to try though).  My only goal here was for the tools to operate with an AC adapter as they did with batteries, not to somehow become super-powered corded tools.  There seem to be a lot of assumptions that I wasn't happy with the performance of the tools in their cordless mode, which is not true at all.

Ed_McCarron:
Nah, no assumptions intentionally made.  I've burnt up more than my share of premium cordless drills drilling to mount antennas on water tanks - its a pain to haul extension cords up there, so I know what kind of current they draw when pushed.  I can kill a Milwaukee 18v battery in about 3 minutes.

So, mathwise, if the pack is made of 2200mah cells, that means it can supply 2.2A for an hour.  Since I killed it in 1/20th of that, I'm pulling 2.2 * 20  --  44A.

I'm just thinking that when pushed hard, you may find the drill stalls.  I'd love to hear otherwise -- because then I'll be buying that same adapter. :)

ahofle:
Well I was able to drill through a 1/8" piece of steel with a small bit with no problems.  I changed to a 1/2" bit and I was able to make it stall by pushing really hard.  I wasn't able to stall it or notice any difference in wood.  I also noticed some torque issues with the circular saw.  It definitely appears that certain tools draw more than 4.5 amps when pushed really hard as Ed mentioned.  I wonder if the 150 watt supply would have worked out better: http://www.powerstream.com/AC-A0407.htm (I got the 90 watt thinking that would be more than enough).   :banghead:

Anyway, I would definitely say this mod is not for people doing heavy duty work like drilling 1/4" steel plates or framing houses.  It's also not a substitute for corded tools (but I already knew that).  But I am still happy with it for my limited hobby usage.

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