Hi Guys.
Looking to restore and old screw-driver that originally ran on 2 NiMh-cells ( so around 2-2.5V).
Its low value and I´m not really sure how much use it will ever get, - but I would like to give it a try.
I would like a bit higher speed and I´m willing to sacrifice some torque ( and lifetime...).
No-load current at 3.5V is around 3A. assuming that peak-current will be 5-10A (very short)
So replacing the 2 cell with a single 18650 and a USB-charger seems like an "easy" solution.
BUT, I cannot find the right (cheap) components on ebay for this. Theres plenty of single-cell USB chargers that will work up to 3A. There is some charge/protection-boards that will tolerate 10-15A, - but without USB-interface for charging.
How would you tackle this?
Its not this exact model, but very close:
Kind regards TroelsM
Looking to restore and old screw-driver that originally ran on 2 NiMh-cells ( so around 2-2.5V).
Its low value and I´m not really sure how much use it will ever get, - but I would like to give it a try.
I would like a bit higher speed and I´m willing to sacrifice some torque ( and lifetime...).
No-load current at 3.5V is around 3A. assuming that peak-current will be 5-10A (very short)
So replacing the 2 cell with a single 18650 and a USB-charger seems like an "easy" solution.
BUT, I cannot find the right (cheap) components on ebay for this. Theres plenty of single-cell USB chargers that will work up to 3A. There is some charge/protection-boards that will tolerate 10-15A, - but without USB-interface for charging.
How would you tackle this?
Its not this exact model, but very close:
Kind regards TroelsM
Find a broken electronic cigarette. Some are cheap enough that you had might as well buy a new one.
The electronics normally outlive the battery. They work on USB with a low value resistor 1 to 2.2 ohms in series.
Some of them used to explode if the resistor was not fitted.
I have used one of those tools in the past and found it quite respectable.
The electronics normally outlive the battery. They work on USB with a low value resistor 1 to 2.2 ohms in series.
Some of them used to explode if the resistor was not fitted.
I have used one of those tools in the past and found it quite respectable.
A very interesting idea. My only concern would be if the battery+BMS in an E-cig cen deliver enough current?
Thanks for the idea
TroelsM
Thanks for the idea
TroelsM
Even small ones provide two amps.
E-cogs have a timer on them so you would be running the tool motor directly from the battery.
E-cogs have a timer on them so you would be running the tool motor directly from the battery.
Look for a TP4056 module, or use a power bank as a power source and charger, although cheap ones tend to have lousy cells in them, and good ones have cells optimized for capacity rather than current. Vapes or tool packs should have high-amp rated cells.
In my experience those sort of electric screwdrivers are best used as donors for other projects. You can pick up proper driver drills with missing or dead batteries for next to nothing. 9.6V Makitas work very nicely from 12V.
In my experience those sort of electric screwdrivers are best used as donors for other projects. You can pick up proper driver drills with missing or dead batteries for next to nothing. 9.6V Makitas work very nicely from 12V.
It looks like a dead ringer for the Milwaukee 6546, the most used screwdriver in my collection. (I have 3) Its great for all the screws used to hold together electonics. I'm not sure the effort for swapping to a different battery etc. would be that useful. I can't tell if the batteries are interchangable with the Milwaukee but if so just get a new battery. 600 RPM is usually fast enough. Faster can just lead to damaged screw heads etc.
So cool.
I got this wonderful nearly useless nineshooter at a disciount:
It runs slow for more torque, but still wont push a dry wall screw into the paper.
Its 3,7 volts I think, so I probably have to fit four cells to make it pull. I wont push it hard except for few seconds at the time. I just dont like to throw things out, and its really handy.
Cheers!
I got this wonderful nearly useless nineshooter at a disciount:
It runs slow for more torque, but still wont push a dry wall screw into the paper.
Its 3,7 volts I think, so I probably have to fit four cells to make it pull. I wont push it hard except for few seconds at the time. I just dont like to throw things out, and its really handy.
Cheers!