Thursday, October 09, 2025
Hypodermic Tip As Deposition Probe ... Nah.
Well I had a hypodermic needle probe in, and there was some resin, so I tried it as a deposition probe. Not very good results, wasn't really expecting much. Here's a micrograph:
Initial contact point is the top left of the square. White lines are probe tracks in Sharpie, blobs on the corners are cured resin. The sides are roughly 100μm a side (sorry, done manually) and so the blob of deposited resin looks to be roughly 30-40μm diameter. Not good enough. Will have to make a proper micron probe, which last time got me better than 10μm dots.
Aside on microscope image sensors: This cheap one (sub-Mpixel) I'm using here is heinously sensitive to IR light and grubby as all heck. If I try illuminating the sample with a halogen bulb it instantly whites out. Had to take this using the LED desk lamp. Better 23mm dia USB image sensor is on my Xmas list if Santa is listening...
How do you get it to deposit from the needle? Is there a device that pushes air through it?
<< Home
