Here is a link to a cool site ...

http://digital-photography-school.com/how-to-make-a-inexpensive-light-tent/

It shows how to make an inexpensive light box/tent from a big box.
I did this using a box that a TV came in.
And I not only use a light (just a desk/drawing table lamp) on top but often use
two others, one on the left and one on the right to bring in some directional light
that can give more definition to the blade grind lines.
I have a tripod and use just a digital point and shoot ... a little Canon or a small Sony...
but just a point and shoot. Also you can add different color papers or fabric for the backgrounds.
Here are some photos I took using this inexpensive/homemade set up and a simple point and shoot digital camera.

Oh ... The fabric I used on the light box was not fabric but cut up white plastic trash bags.