I am a total newbie to electromagnets. I am a Machinist and need a way of cleaning metal chips out of T-slots on machines. I could not find a tool to buy (I did find one listed from Spap-on but it has been droped for some time). So I am trying to build one. I would like to use 2 AA bateries (pen light design) and keep the overall width of the electromagnet under .5" so that it can fit in the T-slots. Length is not an issue and I am not sure what is more important,pull or area for the chips to attract to. Any help to where I could buy the tool,just the electromagnet, or tips on the design would be greatly appreciated. Just keep in mind I am a Machinist...so keep the words simple! Here is a link to all I could find for off the shelf electromagnet in .5". But it is 12V...will it work for me @ 3V?