One of the things I’ve been wanting for the workbench for a while now is a bench top drill press so that I can put holes into things with a little more precision than I can with a hand drill.
At my local Habitat For Humanity Restore today, I came across one that looked in pretty decent condition and just the size that I was looking for. Price was pretty reasonable ($50), so I bought it.
It’s an older model Delta 11-950 8″ drill press with 1/4 hp motor and 5 cm travel range. There are 5 available speeds, and changing speeds is done by opening up the top cover and moving the drive belt up or down to different levels on the drive pulleys.
The drill press is a lot quieter than I expected, and works really well. The drive belt seems to be in pretty good shape without any obvious cracks or flaws in it. The work platform is smallish, but should be adequate for the projects that I have in mind. The 1/2″ chuck is plenty large enough to handle the bits that I have.
Quite pleased with this acquisition for the workbench. Now I’ll be able to up my building game a bit.
Just about every medical physicist has a collection of old test gear, phantoms, test objects ,meters and the like.
A few years ago, while rummaging through the equipment cabinet in our store room/library/lab, I came across a variant of a mammography phantom that I hadn’t seen before. Instead of the normal pink wax insert, this one had 16 wax squares of different colours.
Aside from the curved bit of plastic at one end of the phantom (a test object, not a ghostly apparition), it’s the same size as the conventional ACR accreditation phantom. Reminds me of one of those sliding number/picture puzzles where you have to slide the squares around to reconstruct the image.
I let it sit on my book shelf along with some of the other pieces in the collection. A few months ago, I decided it was time to have a look and see what the inside of the wax blocks looked like.
Looks like at some point in its history, the pieces got a little scrambled and reinserted a bit randomly. I was expecting that each colour block would represent a different density. Instead there are the usual fiber, speck, and mass groups, but not nearly as uniformly placed as in the accreditation phantom.
I don’t know how old this phantom is or what time frame it might have been used at work. The only mammography phantom I was familiar with before this one was the pink one, so possibly before 1996 at least. Definitely pre-1999.
If anybody out there happens to know anything about this style of mammography phantom, let me know.