DRILL PRESS LIGTH FROM SCRAP

It's a very brigth led ligth that can be made from parts taked out from a broken lamp, a magnet rescued from a old speaker , you only have to buy a bunch of leds,17 exactly

Step 1: Materials

FIRST OF ALL YOU HAVE TO BE CAREFULL HANDLING 110 OR 220 VOLTS ALTERNATE CURRENT IS VERY DANGEROUS WITH RISK OF LIFE,SO TAKE YOUR SAFETY PRECAUTIONS AND NEVER WORK ON THE DEVICE WHEN IT IS PLUGGED IN.

Electronics parts obtained from a low consumption lamp(watch out ,the bulb is constructed with very dangerous and poisonous gasses,take your precautions)

The speaker magnet will fix the ligth to the drill press(or any electric machine that needs light )

Top and bottom of a deodorant can,they give support to the leds

Step 2: Electronics

From the broken lamp we can obtain the materials for the source:

.047 uf (designed 473j)
4 diodes we can cut the whole weathstone bridge including a fuse it came with
1 4,7uf electrolitic capacitor
1 15ohms resistor
1 1100ohms resistor

They were tested on the breadboard on a try-error test and for the 220v of my home line the valours of the elements, ligth bright the leds and get about 2.9 on each led,wich is safe for a long life of the led


If your local line is 110v then you need two .047uf capacitors

The leds are connected in serie one behind the other,and the other components are connected according the graphic on pic 3

Step 3: Installing the Leds

Mark dividing the lid on 8 drill a 5mm hole on each line,then drill 8 holes in betwen lines,and one on the center ,pic1

Put the leds around taken care of the cathode of one led facing the anode of the next one,and so one until we get to the center ,pic2

Cut the led's leg to reach the next one ,and then sold them, pic3

Step 4: Enssambling and Testing

Cut a plastic circle in order to install it in betwen both lids,to insulate the leds from possible unwanted contacts

Unite the parts with some rounds of tape,pass previously the wire throw the upper lid's hole

Step 5: Installing

Attach the magnet to the ligth,then put them on the best position to illuminate the base of the drill press, the magnet will do it's job holding firmly the ligth

Pass the wire along the original wires,get inside the switch and connect to the on position

Push the on switch and ,voilá, the ligth was done

Hope is usefull for someone who need light on a working place,if so don't forget to vote for the contest . Thank You

Comments

[Omnivent]

Hi,

I've been planning on 2..3 (to avoid shadows) LED lamps on my drill press for a good while now, but will probably use a battery, as I want them to have magnetic mounts as well and that doesn't go well with hard-wired mains IMO.

Hard-wiring needs rigidly mounted lamps and I'd like to be able to re-position and/or remove them at will, without needing disassembly.

Either way, light really helps (and I usually wear a headlamp for it). For a hardwired solution like yours, you can get by with less LEDs, if you feed them more current - increasing the dropper cap to around 330nF (0.33µF) would be good for 16.8mA in 17 LEDs on 220V @ 50Hz and it really ought to be an X-class cap. If you use 5 LEDs, a 220nF cap will give you ~14mA in the string.

Personally, I'd go for around 25mA in a 3-LED string (which takes 380nF total e.g. 330nF//47nF). It will lessen the lifetime of the LEDs somewhat, but they'll still out-live your drill press :)

As is, each LED is getting a meager ~2.4mA!

A high value bleeder resistor should go over the cap (in parallel) or better 2 series connected resistors (still in parallel with the cap), as the common resistors are rated for 200V and the peaks are over 300V.

The 15 Ohm resistor should be around 100..200 Ohm (it's what protects the capacitor from a too large inrush current, when switched on at one of the peaks of the mains waveform)

Finally, a low rated (slow blow) fuse is mandatory to keep your home/workshop intact.

Hoping this will help.

Have a nice day :)

[baecker03]

the inductive loading may cause voltage spikes... while this may not affect anything in the short term, in the long term it may reduce the life of the leds

[Ugofirst]

Hi baecker ,here is where the 4,7uf electrolitic capacitor does it's job ,it moderate the ups and downs of the rectified sinoidal wave. Cheers

[BeachsideHank]

Important feature to have on a drill press or milling machine, nice project! ☺

[Ugofirst]

Thanks,I appreciate your comment BeachsideHank!