Can anyone suggest a sensor that could detect range from 0.75M to 3M with 0.1mm accuracy? Hopefully something that is reasonably easy to set up since it will used in a nonpermanent installation.
What do you plan to measure?
Regards
You did not say cheap 
http://www.newall.com/products/?name=SHG-A2+Linear+Encoder&catid=19&prid=43
A vernier caliper maybe? But you'll need a very big one.....
vffgaston:
What do you plan to measure?Regards
I will be measuring the distance from the floor to a table. The table itself will be moving up and down. The table already exists and is motorized due to the heavy load that it lifts but it is completely manual. Ideally, I want to input a distance and use the arduino or similar to move the table to the specified distance.
I am hoping to make a sort of drop in solution that doesn't require retooling the table itself. My initial thought was to use something like a ultrasonic sensor or lidar. I haven't seen an ultrasonic sensor capable of 0.1mm accuracy and haven't seen many lidar-type sensors at all.
The table already exists and is motorized due to the heavy load that it lifts but it is completely manual
The motor: is electrical, hydraulic, . . . .?. Is the mechanism geared?
How much is "heavy"?
How much clearance (looseness) have you in the whole mechanism?. Does the position of the table varies if the load is removed (for instance by an auxiliary crane thas picks it up)?
Regards
("Does the position of the table varies . . " is that correct? - the english, I mean. I would write "varie" but google corrects it . . . -I'm spanish 
)
vffgaston:
("Does the position of the table varies . . " is that correct? - the english, I mean. I would write "varie" but google corrects it . . . -I'm spanish
You were very close: vary, with a -y
You were very close: vary, with a -y
Forum is a good place to refresh english. Thanks! 