A microtome is a machine which cuts (usu.) biological specimens into very thin sections. The sections are typically mounted on microscope-slides.
This was an idea I had, I did it, and I've demonstrated it with garlic
It creates slices 250 microns thick*
If anyone is actually thinking of building one of these see the last step. You can also PM me if you need more
Step 1: Construction: base and mount runners
These images show the base of the device and the red runners for the specimen platform, also the final drive to the rack.
Step 2: Construction: mount plate
Being Lego, the plate can be easily customised to hold a variety of samples.
Step 3: Construction: upwards towards the gear-train
In this sequence you see the front rails that hold the blade assembly being added (yellow and grey)
Step 5: The blade
Step 6: Construction: finishing
All the way to the end: