- Fri Feb 01, 2013 9:17 am
#154984
Morning!
Before I buy some components, I figured some arm chair engineering is in order to determine feasibility. It is mean to be a control ring that is environmentally sealed.
1. I have an aluminum sealed pipe that is around 2.5" in diameter with a centrally 3-axis of magnetic/compass sensor(s).
2. I have an aluminum sleeve around the pipe which can freely rotate around the tube (X and Y axis) and can move along the pipe by 1.5" (in the Z axis )(-0.75" to 0.75"). There is some dimpling and a spring loaded ball to provide between the sleeve and the pipe to lock in positions.
3. I have a N42 NIB magnet (3/16" dia. x 1/8" thick) located at 0 degrees and the middle of the sleeve. It should provide an appropriate level of gauss that won't saturate the sensor but be on the upper limit of the sensor.
4. I have redundant reed switches located at 0 degrees and -0.75" position to electrically turn off all of my circuits when the sleeve is moved to that position.
The concern I have is the minimum determinable angle that this setup can give me without yet building this. I am sure rotating the sleeve along the plane at 0" will give me good results (X and Y axis), but how well will it provide rotational measurements when the sleeve is at 0.75" in the Z axis? Also how well will the Z axis work when the sleeve is at 90 and 270 degrees? Does it need to be a four axis mag sesnsor?
Thanks,
Frank
Before I buy some components, I figured some arm chair engineering is in order to determine feasibility. It is mean to be a control ring that is environmentally sealed.
1. I have an aluminum sealed pipe that is around 2.5" in diameter with a centrally 3-axis of magnetic/compass sensor(s).
2. I have an aluminum sleeve around the pipe which can freely rotate around the tube (X and Y axis) and can move along the pipe by 1.5" (in the Z axis )(-0.75" to 0.75"). There is some dimpling and a spring loaded ball to provide between the sleeve and the pipe to lock in positions.
3. I have a N42 NIB magnet (3/16" dia. x 1/8" thick) located at 0 degrees and the middle of the sleeve. It should provide an appropriate level of gauss that won't saturate the sensor but be on the upper limit of the sensor.
4. I have redundant reed switches located at 0 degrees and -0.75" position to electrically turn off all of my circuits when the sleeve is moved to that position.
The concern I have is the minimum determinable angle that this setup can give me without yet building this. I am sure rotating the sleeve along the plane at 0" will give me good results (X and Y axis), but how well will it provide rotational measurements when the sleeve is at 0.75" in the Z axis? Also how well will the Z axis work when the sleeve is at 90 and 270 degrees? Does it need to be a four axis mag sesnsor?
Thanks,
Frank