Commit cae31323 authored by Sam Calisch's avatar Sam Calisch

Update README.md

parent 4e692fb7
Pipeline #2933 passed with stage
in 2 seconds
......@@ -48,9 +48,9 @@ I analyzed the impedance as a function of frequency (using the handy Analog Disc
The pattern for this speaker stressed my coil laying tool in ways that my previous prototypes hadn't, and the the applicator tip became a point of failure. I'm working on two improvements to this. First, the software correction for tool offset from rotational axis has been a pain to keep calibrated and is a source of error when pushing the limits of radius of curvature. To get around this, I designed a mechanical correction in two axes for the tool center point using 3/16-100 microadjustment screws. By using these adjustments and measuring the output with my zund microscope tool, I can dial in the alignment to about 10 microns.
<img src="img/coil-layer-adjustment.jpg" height=400px>
<img src="img/coil-layer-bearings.jpg" height=400px>
Second, the winding paths of this speaker membrane put torque and axial load on the single 3mm OD ball bearing (with 1mm balls inside!) that I had been using to apply the wire. After a few jobs, this roller would have the characteristic "crunch" of an overloaded bearing. I owe an offering to St. Venant. To fix this, I made a small roller applicator, held by two 3mm OD bearings. This effectively limits the torque seen by the bearings and doubles the effective radial load (because there are two instead of one). It also allows me to experiment with different applicator profile shapes. Two are shown below, on a penny for scale.
Second, the winding paths of this speaker membrane put torque and axial load on the single 3mm OD ball bearing (with 1mm balls inside!) that I had been using to apply the wire. After a few jobs, this roller would have the characteristic "crunch" of an overloaded bearing. I owe an offering to St. Venant. To fix this, I made a small roller applicator, held by two 3mm OD bearings. This effectively limits the torque seen by the bearings and doubles the effective radial load (because there are two instead of one). It also allows me to experiment with different applicator profile shapes. Two are shown above, on a penny for scale.
<img src="img/coil-layer-bearing.jpg" height=400px>
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment