Posts tagged ‘power’

Makita 9500d Cordless Angle Grinder on Steroids

I wanted one for a long time, but getting one wasn’t easy. I don’t think that they were good sellers at all, most of them most likely went to trash several years ago. Anyway, I was able to find one on ebay kleinanzeigen in Germany. Seller told that it is in good working condition, battery was missing, and the shield was missing as well. I didn’t care for the battery, as I wanted to do a Li-Ion conversion. For the shield, I’ve found a solution on Aliexpress, the Chinese sell shields that you can attach to your drill, and then do ridiculous things with it… It was quite easy to adapt one to the Makita.

When I got it, I tested it out with

my existing Makita NiMH battery, the performance was a lot worse than expected, and the motor was pretty worn, or at least it sounded like that. I looked in my parts that I’ve salvaged from cordless drills, and found a matching motor out of a green bosch drill (don’t remember the model, but it was a 12v NiCD model that I got for free because of the dead battery). This one felt quite beefy (strong magnets, compared to the original), and felt like new. I’ve removed the pinions and pushed the Makita pinion to the Bosch motor using my vice.

I’ve built a battery out of 3 18650 cells (Warning: you need to know what you’re doing, you cannot use normal 18650 cells, it needs to be high discharge cells – like the ones used in cordless tools). There’s no over discharge protection, I’m able to handle this by myself, worst case I would have to replace the battery, if  I run it too low.

Makita 9500D Complete

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Messing with Windows XP power profiles

Windows XP’s default setting for Standby mode is kind of frustrating. Even if the computer is part of a Windows Domain, Pc’s go to standby after a timeout by default. I have done the following to solve this problem:

1. Microsoft supplies a tool called powercfg to handle power profiles, however powercfg only works with administrative privileges by default, changing the registry permissions is a must if you want to do it with user privileges (I’ve used SetACL which is not part of windows):
%windir%\system32\SetACL.exe -on "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Controls Folder\PowerCfg" -ot reg -actn ace -ace "n:%computername%\users;p:full"
%windir%\system32\SetACL.exe -on "HKU\.DEFAULT\Control Panel\PowerCfg" -ot reg -actn ace -ace "n:%computername%\users;p:full"

2. to add a new profile, and configure it, i run the following under every user:
powercfg /C efag-pwr-nb
powercfg /X efag-pwr-nb /monitor-timeout-ac 20
powercfg /X efag-pwr-nb /monitor-timeout-dc 15
powercfg /X efag-pwr-nb /disk-timeout-ac 30
powercfg /X efag-pwr-nb /disk-timeout-dc 10
powercfg /X efag-pwr-nb /standby-timeout-ac 0
powercfg /X efag-pwr-nb /standby-timeout-dc 0
powercfg /X efag-pwr-nb /hibernate-timeout-ac 0
powercfg /X efag-pwr-nb /hibernate-timeout-dc 0
powercfg /X efag-pwr-nb /processor-throttle-ac NONE
powercfg /X efag-pwr-nb /processor-throttle-dc ADAPTIVE
powercfg /S efag-pwr-nb