Projects
Recently Updated
Most Likes
Newest
Project Lists
Discover
Contests
Courses
Stack
More
Courses
Tutorials
Events
Hackerspaces
Hackaday.com
Tindie Marketplace
Sign up
Log in
Close
Freezer kiln for wood drying
Back to overview
I'm making a small freezer into a kiln for drying wood bowl blanks.
Kevin
Back to overview
Files
0
Components
10
logs
2
Instructions
0
Discussion
0
« Back to project details
Sort by:
Newest
Oldest
30 days of temperature and humidity readings
07/25/2021 at 16:28
•
0 comments
30 days of temperature and humidity readings, on the same window as the "weight" graph in the other log entry. The blue line here is the ambient sensor from outside of the kiln, whereas the green and yellow are at 2 different places inside the kiln.
30 days of "weight" measurements
07/25/2021 at 11:04
•
0 comments
30 days of "weight" measurements. This is actually taken from a strain gauge attached to a thin bridge across an aluminium block, where the block is supported at one end and the platform that the wood is on is attached to the other end. The problem with this approach is that as aluminium heats up it expands, causing more strain, therefore the reading is only representative of weight as long as the temperature stays constant.
The graph should be read not as an absolute value, but more as a "shape" - as it tends towards horizontal, then the weight of the wood is changing less and the wood is therefore dry.
There are periods on the graph shown here where the heater is not running (the two large dips and the later shorter dip) and where the fan speed is reduced (causing the smaller increases in the middle of the graph, as the overall temperature increases slightly due to the reduced fan speed).