joiner1970 said:
The plug it power adapter is a good idea. I've often thought why don't cordless tools come with an adapter to run off mains when power is available.
Power adapters to convert one voltage to another need to be amperage rated.
Iphones for instance don't draw a lot of power, so the the plug in mains usb power adapter can be very small, about one inch square.
A macbook on the other hand uses much more power, and has a much larger battery so the mains power adapter is about 6 times the size and weight.
Most power tools have a much higher power draw than either an Iphone or Macbook. Power tools also vary greatly in the power draw depending on the type of power tool. I have an older cordless Milwaukee jigsaw. On one 12v 2.4 amp hour battery, the jigsaw will run continuously no load for about 35 minutes. The cordless Milwaukee Hatchet Sawzall I have uses 18v batteries, but will only run for about 5 or 6 minutes using a 2.4 amp hour battery made with the same battery cells. The Sawzall seems to draw about six times the amperage of the jigsaw.
Festool might have been able to produce an corded adapter for the new cordless sanders due to the relatively low amperage the sanders draw compared to other tools. The corded version of the 5" random orbit sander draws about 2 or 2.5 amps, which is one of the lower wattage ratings for any of the Festool tools.
It should also be mentioned that corded adapters have been made so that cordless tools could be run on mains power. One was sold by Greenlee for Makita cordless 18v tools. It apparently worked OK for low draw tools, but higher draw tools, like reciprocating and circular saws, would not run using it.