sensor for painting a shaft
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Posts: 46,084
I am prepairing to paint many woden shafts that are about 1/2" in
diameter, 6' long and very crooked, gnarled and twisted. I want my
spray gun to move up and down and fore and aft as the shaft moves.
This way I'l be able to reduce overspray. So, I'm looking for the
right kind of detector to sense the position of the shaft as it
spins. Then I'll use stepper motors to move the spray to maintain
distance and vertical position.
I have heard of ultrasound, but don't know how accurate it could be.
It has an advantage of being able to measure from one location. It
doesn't use a emitter and detector, it is all one physical piece.
Then I've thought that I might be able to focus an IR or regular LED
source to detect minor variation. Disadvantage of having source on
one side and detector on the other.
I also thought I could use a finger like sometimes is used in the bot
world, but occasionally my gun messes up and I have to back up. The
sensor arm would get messy if I did this.
Any thoughts would be appreciated.
diameter, 6' long and very crooked, gnarled and twisted. I want my
spray gun to move up and down and fore and aft as the shaft moves.
This way I'l be able to reduce overspray. So, I'm looking for the
right kind of detector to sense the position of the shaft as it
spins. Then I'll use stepper motors to move the spray to maintain
distance and vertical position.
I have heard of ultrasound, but don't know how accurate it could be.
It has an advantage of being able to measure from one location. It
doesn't use a emitter and detector, it is all one physical piece.
Then I've thought that I might be able to focus an IR or regular LED
source to detect minor variation. Disadvantage of having source on
one side and detector on the other.
I also thought I could use a finger like sometimes is used in the bot
world, but occasionally my gun messes up and I have to back up. The
sensor arm would get messy if I did this.
Any thoughts would be appreciated.
Comments
back a bit. The neat thing to do would be to place the sensors at 90
degrees to the painter, and remember the position as it rotates. This would
allow you to be maximum distance from overspray.
Or, use a fan to pull the overspray up or down, and away from the sensors.
Then again, if you have memory, you can rotate and sense, save the
information, cover the sensors, and paint from memory<G>.
Original Message
From: Don Lunn [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=CmoCgpfIaooExzWeB-vLm7XsIoQWBTiuaHFtVOgQ9vCduUQGRL6SANeONj74hI3HuoKUabYi4ETZ-g]delunn@h...[/url
Sent: Friday, December 19, 2003 12:17 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] sensor for painting a shaft
I am prepairing to paint many woden shafts that are about 1/2" in
diameter, 6' long and very crooked, gnarled and twisted. I want my
spray gun to move up and down and fore and aft as the shaft moves.
This way I'l be able to reduce overspray. So, I'm looking for the
right kind of detector to sense the position of the shaft as it
spins. Then I'll use stepper motors to move the spray to maintain
distance and vertical position.
I have heard of ultrasound, but don't know how accurate it could be.
It has an advantage of being able to measure from one location. It
doesn't use a emitter and detector, it is all one physical piece.
Then I've thought that I might be able to focus an IR or regular LED
source to detect minor variation. Disadvantage of having source on
one side and detector on the other.
I also thought I could use a finger like sometimes is used in the bot
world, but occasionally my gun messes up and I have to back up. The
sensor arm would get messy if I did this.
Any thoughts would be appreciated.
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that would fit this application.....But using an optical sensor, you will have
to deal with overspray as mentioned below
ken
Overspray is the problem. If you use visual (IR), you can place the sensors
back a bit. The neat thing to do would be to place the sensors at 90
degrees to the painter, and remember the position as it rotates. This would
allow you to be maximum distance from overspray.
Or, use a fan to pull the overspray up or down, and away from the sensors.
Then again, if you have memory, you can rotate and sense, save the
information, cover the sensors, and paint from memory<G>.
[noparse][[/noparse]Non-text portions of this message have been removed]