Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? - CR4 Discussion Thread

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Kirk Participant Join Date: Jan 2007 Posts: 3	Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 01/16/2007 10:27 AM
	I am looking for a Pneumatic (or otherwise powered) Sensor/Probe that will detect linear displacement. Heres the application: An I-beam will be worked on by an automated plasma cutter. The beam needs to be measured in order for the plasma cutter to work, and it takes a long time to measure using the tool itself. We need two powered probes that will drop down from a bridge to touch the i-beam, and return the displacement. Thanks for the help
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	Pathfinder Tags: linear displacement pneumatic probe pneumatically powered Powered probe

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Anonymous Poster	#1 Re: Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 01/16/2007 10:54 AM
	Why not a laser? There are lots of laser sensors on the market.
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Kirk Participant Join Date: Jan 2007 Posts: 3	#2 In reply to #1 Re: Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 01/16/2007 10:57 AM
	We looked at lasers, we need an accuracy of around 2 thou at 20 inches, it's impractical for a laser.
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MidniteFighter Power-User Join Date: Dec 2006 Location: Buffalo, New York Posts: 142 Good Answers: 1	#3 In reply to #2 Re: Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 01/22/2007 2:33 PM
	How about an ultrasonic sensor?? Some Banner ultrasonic sensor can detect up to 3m. With a little modification to the circuit, you would probably do it. MidniteFighter __________________ My mind is full of useful knowledge, I just don't know how it applied.
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Kirk Participant Join Date: Jan 2007 Posts: 3	#4 In reply to #3 Re: Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 01/22/2007 2:43 PM
	Ultrasonic is used for proximity sensing, it's not nearly accurate enough for this application, we have gone with pneumatic cylinders with internal LVDTs which give a resolution of around 5 micrometers, thanks all for the suggestions.
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ManDownUnder Participant Join Date: Aug 2007 Posts: 1	#5 Re: Some help finding a Powered (pneumatic?) Linear Displacement Sensor/Probe? 08/22/2007 6:02 PM
	If anyone found a solution I'd be interested also. Linear displacement down to a thou over about 48 to 60 inches if possible. I thought of getting a scale scribed into something thermally stable and having a screw driven control provide incremental offsets between scribed marked (i.e. the scribed mark optically confirms EXACTLY where the 18 inch mark is, then a stepper motor provides + or - granular control from there.) Any other thoughts or comments?
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Users who posted comments:

Anonymous Poster (1); Kirk (2); ManDownUnder (1); MidniteFighter (1)

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