Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 16-04-2021, 01:32   #1
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Why did the Hitachi 18V drill light stay on?

Just curious that's all.
I was packing all my tools away this afternoon and noticed the guide light on the drill was "ON". To save the battery charge I detached the 18V battery from the drill but the light remained on for about Ĺ an hour.

Where was the light getting power from?
coopec43 is offline   Reply With Quote
Old 16-04-2021, 04:30   #2
Registered User
 
Simi 60's Avatar

Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 3,243
Re: Why did the Hitachi 18V drill light stay on?

Magic
Simi 60 is offline   Reply With Quote
Old 16-04-2021, 05:00   #3
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 12,407
Re: Why did the Hitachi 18V drill light stay on?

The wireless back up standby power reserve.
The later wifi/bluetooth ones stay on 24/7 (unless you are out of wifi coverage).
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 16-04-2021, 05:08   #4
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Re: Why did the Hitachi 18V drill light stay on?

Quote:
Originally Posted by Wotname View Post
The wireless back up standby power reserve.
The later wifi/bluetooth ones stay on 24/7 (unless you are out of wifi coverage).

Errrr? "The wireless back up standby power reserve" What are you saying?

It's an 18V Drill (not a radio)
coopec43 is offline   Reply With Quote
Old 16-04-2021, 05:16   #5
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Re: Why did the Hitachi 18V drill light stay on?

Quote:
Originally Posted by Simi 60 View Post
Magic

Maybe Elon Musk would be interested?
coopec43 is offline   Reply With Quote
Old 16-04-2021, 05:50   #6
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Caribbean live aboard
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 5,168
Images: 84
Re: Why did the Hitachi 18V drill light stay on?

We never leave batteries attached. Store in a clean absolutely dry place. The lithium batteries have a BMS built in, circuit boards etc
Nicholson58 is offline   Reply With Quote
Old 16-04-2021, 07:28   #7
Registered User
 
OneKoolCat's Avatar

Join Date: Jan 2019
Location: Newburyport, MA
Boat: FP, Lavezzi, 40
Posts: 65
Re: Why did the Hitachi 18V drill light stay on?

The circuit in the drill has a capacitor in it. Depending on the power demands of the LED and the size of the cap it can stay on for a while. If there is something you can do to short or drive up the load it would go out quicker.

Some of the capacitors can hold a fair amount of charge.

Cheers,
Peter
OneKoolCat is offline   Reply With Quote
Old 16-04-2021, 10:34   #8
Moderator
 
roverhi's Avatar

Join Date: Aug 2005
Location: Kona, Hawaii, Carlsbad, CA
Boat: 1969 Pearson 35 #108 & 1976 Sabre 28
Posts: 7,399
Send a message via Yahoo to roverhi
Re: Why did the Hitachi 18V drill light stay on?

Good idea always set the direction switch to neutral. Bouncing around in a bag something can contact the trigger and turn on the drill/etc. and you know how I learned that.

The light staying on is a feature, PROBABLY. Really nice if the light turns on before you start a drill/screwdriver and remains on for a short time after use. Nothing more frustrating than trying to start a screw in a dark location when trying to find that sweet spot on the drill trigger that turns on the light without starting the drill. We want more capacitors and we want them now. Of course if the light stays on because there is short in the drill, that's not good as removing the battery is the only way to live with it.
__________________
Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
roverhi is online now   Reply With Quote
Old 16-04-2021, 13:24   #9
Registered User

Join Date: Dec 2011
Posts: 1,335
Re: Why did the Hitachi 18V drill light stay on?

We call it PFM.
jmschmidt is offline   Reply With Quote
Old 16-04-2021, 13:41   #10
Registered User

Join Date: Jun 2019
Location: Bay of Islands New Zealand
Boat: Morgan 44 CC
Posts: 1,138
Re: Why did the Hitachi 18V drill light stay on?

Given the very light draw of a small LED it is conceivable (as others have said) that a capacitor could keep it running for an extended period with zero battery drain. Makita lights turn off after about 5 seconds (in my experience).

A more pertinent question for me (and probably off-topic) is why canít they design these tools so the the light actually reaches the spot where the tool (driver, drill) contacts the work piece? My Makita 18v drill/driver places a pool of light around the point of contact but the actual point of contact is in shadow. In a dark space this makes it harder to see the point of contact than if there was no light at all. Quite irritating.
CassidyNZ is offline   Reply With Quote
Old 16-04-2021, 15:35   #11
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Re: Why did the Hitachi 18V drill light stay on?

Quote:
Originally Posted by OneKoolCat View Post
The circuit in the drill has a capacitor in it. Depending on the power demands of the LED and the size of the cap it can stay on for a while. If there is something you can do to short or drive up the load it would go out quicker.

Some of the capacitors can hold a fair amount of charge.

Cheers,
Peter

Thank you Peter, that explains it perfectly.
coopec43 is offline   Reply With Quote
Old 16-04-2021, 16:03   #12
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Re: Why did the Hitachi 18V drill light stay on?

Quote:
Originally Posted by jmschmidt View Post
We call it PFM.

PFM?

Wonderful thing this google (What would we do without it)

"Piezoresponse force microscopy (PFM) is a technique used to characterize the electromechanical coupling of piezo- and ferroelectric materials. This effect results from the linear interaction between electrical and mechanical states in piezoelectric materials."

That makes sense
coopec43 is offline   Reply With Quote
Old 16-04-2021, 16:31   #13
Registered User

Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 2,659
Re: Why did the Hitachi 18V drill light stay on?

Quote:
Originally Posted by roverhi View Post
Good idea always set the direction switch to neutral. Bouncing around in a bag something can contact the trigger and turn on the drill/etc. and you know how I learned that.

The light staying on is a feature, PROBABLY. Really nice if the light turns on before you start a drill/screwdriver and remains on for a short time after use. Nothing more frustrating than trying to start a screw in a dark loca drill, that's not go as it.

Good idea setting the direction switch to neutral, but maybe better to remove the battery?

I should have been forewarned about the danger of leaving "things" plugged in. Many years ago on the week-end I had been using the angle grinder in my workshop and when I finished I switched the grinder off at the power-point (yeah, I know ). The following Wednesday my Son woke me up and asked if I would expect the swimming pool pump to start up? On investigation I found the grinder had started up and sparks were flying as it ground away at an aerosol can.

I replaced the power-point switch but mentioned the incident to a household electrician who did not seem unduly surprised at what had happened.
coopec43 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Drill baby drill... littledevil Construction, Maintenance & Refit 13 28-09-2019 23:37
Removable Stay(sail) or not to stay... jcmcdowell Monohull Sailboats 11 30-09-2018 15:10
To drill or not to drill... Jcolman Construction, Maintenance & Refit 25 30-11-2016 11:52
Mounting Antennas on Spreaders: To Drill or Not to Drill ? DevoDave Marine Electronics 12 26-04-2011 09:04
For Sale: Stay sail, storm sail, & head stay MoonlightSailor Classifieds Archive 0 31-10-2009 16:25

Advertise Here


All times are GMT -7. The time now is 17:15.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.