Pages: [1]   Go Down
Author Topic: Moving up and down until surface contact  (Read 506 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 4
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello to all,

I would like to move a rubber wedge up and down in order to measure a distance. The wedge is about half the size of a pen and must measure distances of up 5 mm wide with accuracy better than +/- 0.1 mm. It is moved down until it can go now further and then, based on the vertical distance moved, the horizontal displacement can be computed and outputted. That's it. What I am unsure about is what kind of mechanics to hook up to the arduino to do the moving, the stopping and, most of all, do it very accurately.

Any ideas? Thank you guys so much!
Logged

nr Bundaberg, Australia
Offline Offline
Tesla Member
***
Karma: 129
Posts: 8596
Scattered showers my arse -- Noah, 2348BC.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

You could use a stepper motor and a threaded rod. Depending on the gearing that would be very accurate.

The problem as I see it is how do you know when the wedge is touching? I can think of no way to do this short of measuring the current required to step the motor and this would be very inaccurate.

Can you change to a metal wedge?

What are the two objects made of?

______
Rob
Logged

Rob Gray aka the GRAYnomad www.robgray.com

Offline Offline
Newbie
*
Karma: 0
Posts: 4
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks, Rob. The material whose gap needs measuring is sheet metal. The material of the wedge is arbitrary, it could be metal as well. Indeed seeing when to stop is a major issue. There should be no damage to the object from over-pushing ...
Logged

nr Bundaberg, Australia
Offline Offline
Tesla Member
***
Karma: 129
Posts: 8596
Scattered showers my arse -- Noah, 2348BC.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
The material whose gap needs measuring is sheet metal. The material of the wedge is arbitrary, it could be metal as well.
The reason I asked is that if everything is metal maybe a good way to detect a touch is with conductivity. That wouldn't place any force on the things being measured.

______
Rob
Logged

Rob Gray aka the GRAYnomad www.robgray.com

Pages: [1]   Go Up
Jump to: