dennis@home wrote:


"The Natural Philosopher" wrote in message
...
george [dicegeorge] wrote:
On 08/06/11 22:03, Bob Minchin wrote:
george [dicegeorge] wrote:
Several tools with rechargeable batteries have failed,
one is a LIDL nailer/stapler, with a 18volt 1.3amp battery.

Could I dismantle the battery case and power the stapler from the
mains
using something like Maplin's

High Power Multi-Voltage Universal Laptop Power...
* Universal input voltage for use all over the world with suitable
travel adaptors
* Adjustable output voltage DC 12, 14, 15, 16, 18, 18.5, 19, 19.5, 20,
22, 24V
* 6 amp to 8.5 amp current; dependent on voltage setting
http://www.maplin.co.uk/high-power-m...r-supply-98766




OR
Triple Power Supply
* DC 0 - 30V (2.5A), fixed DC 5 and 12V (0.5A) outputs
* Current can be limited from 0 to 2.5A using the €˜current control.
Triple Power Supply

OR something cheaper?

[g]
Very unlikely to be usable. Peak current from nicads is far greater
than
the supplies you list.

The battery you quote would be 18v 1.3Ah which is NOT the same as
1.3amps

Just buy new nicads for it.
Bob
oh yes, now I look again it is 1.3Ah
which means 1.3 amps at 18volts for an hour
but as you say it probably uses a lot more than 1.3 amps when its
stapling.

yeah. Prolly peaks out at 30A or so.

Doubtful..
I have never taken one apart but I would imagine they use a motor to
drive a stepped cam.
This would lift a sprung hammer and drop it to staple.
Much cheaper than using a solenoid and it doesn't take much power.
However the motor is a reactive load so the initial start could be
hundreds of amps for a very short time, the sort of thing a capacitor
can supply.
They could reduce the starting load by making sure the motor always
stopped at the top of the slope and have it "level", this also reduces
the time between pressing the trigger and the hammer dropping. The motor
winds it back up post stapling.

Motor resistance limits it to about 30A or so. They are not great motors
in these things.