I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries because I forget to switch it off between cuts.

Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.


Has anyone else already done this ?


Any tips or advice .




Chris

On Fri, 20 Feb 2009 10:33:32 +0000,
wrote:


Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.

A useful source of LED/laser module power supplies is mobile phone
chargers. The newer ones for lithium batteries tend to be 3.5V output
and switched mode so they are both efficient and light weight. The
average child will have about half a dozen spare from phones that went
out of fashion after a few days use.

On Fri, 20 Feb 2009 10:33:32 +0000, christopher wrote:

I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries because I forget to switch it off between cuts.

Hmm, mine doesn't work unless the blade is turning, which always seems a
bit goofy - I'm not sure yet if it's powered from a widget run by the
motor turning, or a step-down transformer / rectifier somewhere.

It's on the to-do list to move it to a separate switch (and power source
if needed), though.

Know what you mean, however - I keep leaving the laser cross-hairs on my
drill switched on in the same way. Another option might be to wire in a
time-out circuit that'll shut the light off after some period of time
after the switch was last pressed.

wrote on 20/02/2009 :
I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries because I forget to switch it off between cuts.

Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.

No reason why it cannot be done, but makes it a bit cumbersome.

Has anyone else already done this ?

Any tips or advice .

Wouldn't a time out circuit be be better, but using the existing
batteries?

Change the on/off switch for a push button which operates a time-out
circuit. Fail to press the button often enough and it switches itself
off. There are few to be found on the Internet usually involving an FET
on the output, they were a quite common addition for test meters before
they started to include a battery saver circuit.



--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

On Feb 20, 4:33*am, wrote:
I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries *because I forget to switch it off between cuts.

Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.

Has anyone else already done this ?

Any tips or advice .

Chris

Rechargable batteries.

wrote:
I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries because I forget to switch it off between cuts.

Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.


I'd always assumed they did run from the saw. Why would they design one
with batteries?


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk

On Fri, 20 Feb 2009 07:28:42 -0800, ransley wrote:
Rechargable batteries.

Way too complex

Jules wrote:
On Fri, 20 Feb 2009 10:33:32 +0000, christopher wrote:

I love the laser line facility on my mitre saw , however it costs me
a fortune in batteries because I forget to switch it off between
cuts.

Hmm, mine doesn't work unless the blade is turning, which always
seems a bit goofy - I'm not sure yet if it's powered from a widget
run by the motor turning, or a step-down transformer / rectifier
somewhere.

It's on the to-do list to move it to a separate switch (and power
source if needed), though.

Know what you mean, however - I keep leaving the laser cross-hairs on
my drill switched on in the same way.

Laser cross hairs on a drill? What make/model is that? Are you licenced to
drill?


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk

wrote:
I love the laser line facility on my mitre saw , however it costs me a
fortune in batteries because I forget to switch it off between cuts.

Im thing of wiring a 3v transformer in to the saw and feeding the
light from this.


Has anyone else already done this ?


Any tips or advice .

Not sure if I can get to the wires in mine, but I will send an answer in
the next 48 ish hours.

Dave

On Fri, 20 Feb 2009 23:13:22 +0000, The Medway Handyman wrote:
Laser cross hairs on a drill? What make/model is that? Are you licenced to
drill?

Ha - I can't remember off-hand, but it's some low-end pillar drill (given
that the more costly "DIY" stuff seems to share headstocks, motors etc.
with the lower-end I decided paying extra for a product that wasn't
actually better seemed a bit silly!).

I was surprised at that particular feature, but it seemed like they all
have it these days (at least this side of the pond).

It's a useful feature once in a while, I suppose - but I'm so used to
using pillar drills that don't have it that I tend to forget that it's
actually there

cheers

Jules