Auto Darkening Welding Helmet

This helmet was purchased at a shop in Kelantan Lane.

At that time, it was the only one left in stock.
Price was S$65/-.
It came with a clear and a green plastic protection screen for the lens.
 
It has Welding and Grinding modes.
There is a knob to adjust between DIN 9 to 13.
There is also a knob for sensitivity.
Selector switch for the delays can be found on the inside of the visor.
It is solar powered.
 
Looking at the sun will not darken the lens, but looking at fluorescent lights will.
Apparently the sensor is only sensitive to flickering lights.
 
Looking at a fluorescent light, adjust the DIN level.
You will be able to see that the shade does vary with the DIN setting.
 
Unlike the DIN level knob, you will not be able to tell if the sensitivity knob is working.
It is best to set it somewhere midway and play by ear, to see if there is any effect.
 
Vision is concentrated to the centre portion of the lens.
The centre portion gives a clearer view then the portion at the surrounding sides.
However, this does not seem to impair its function that much.
 
Below is the helmet worn by my 14 year old daughter.
She was watching TV.

 

Dremel 561

Got this Dremel Bit 561 off ebay.

 

 

It came in a packet of 3.

It is the one on the top.
It is a spiral cutter, the helix is reversed when compared to a drill bit.

A simple test run on a 5mm thick PVC sheet clamped to a vise.

The round hole is what you get when you don’t hold it firmly in your hand.

I pushed the bit thru the sheet and it wobbled like crazy… should have held on to it tightly.
However, holding it firmly, I managed to glide the bit smoothly across the sheet.
I suppose you can use it on thin sheets of acrylic or other plastic materials.

 An alternative to a jig saw cutter.