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+---- Thread: Touch Probe (/thread-1844.html)
Touch Probe - claudef - 11-12-2013
http://www.vinland.com/Touch-Probe.html
This web site shows the standard concept of the TP, the wire interfaces with the Digital Read Out (DRO) as the probe touches a part on the milling machine the DRO records the 3 Axis measurements of the position.
Now Im not that sophisticated, I only want to pick up edges of parts or centers of holes and set my mill dials to zero.
I dont want wires, I want it to be a self contained unit.
I will put two LEDs in the bottom plate, this material lights up quite nicely with LEDs.
I want the LED to light when the contact on balls is broken, not when the circut is closed.
This unit measures 2 in diameter and 2 high. I made the battery container and installed in the body (3 LR44s) 4.5V. Now I need to make the cover for the batteries.
I have a friend working on the electronic to fit in this body.
RE: Touch Probe - TomG - 11-12-2013
I'm trying to figure out how this is supposed to work. It seems like it would take quite a bit of movement on the point to break contact on any of the balls.
Tom
RE: Touch Probe - claudef - 11-12-2013
TomG,
Any movement regardless how miniscule it is will break contact.
RE: Touch Probe - DaveH - 11-13-2013
This is interesting
DaveH
RE: Touch Probe - stevec - 11-13-2013
It sure is I'll be watching for progress reports Claude.
RE: Touch Probe - TomG - 11-13-2013
What are you going to use for a probe, a ball? If so, how will you center it on the axis of the shaft? Maybe a three point adjustment on the plate holding the balls?
Tom
RE: Touch Probe - claudef - 11-13-2013
Well, I was away all day today so the project stood still. Tomorrow I will make the battery cap then work on the probe.
TomG, yes you are correct, I will be using a ball and there will definatly be a 3 point centering feature. The design for the electronics is complete so I now know that it will fit into the cavity of the probe along with the spring, probe and ball ring. I will post pioctures as progress goes on.
RE: Touch Probe - claudef - 11-14-2013
Completed the battery cap today and also turned the probe. Tomorrow installing the pins and then the ball ring.
The design is completed for the integrated circuit, it measures 0.8 "long by 0.3" wide components R1, R2 and C1 will be placed under. It will give a thickness of about 0.3 "with 4 wires coming out.
RE: Touch Probe - claudef - 11-14-2013
This the schematic of the circut..
RE: Touch Probe - EdK - 11-15-2013
claudef,
There's something wrong with that drawing, or I'm misinterpreting it. Pins 4, 5, 9 and 10 are all inputs to NAND gates with nothing driving them so you have floating inputs with the NAND gate outputs driving the LED. Not a good thing. I think those four pins need to be connected to the other NAND gate inputs, pins 1, 2, 12 and 13.
The other thing using that particular IC is that the outputs will likely be fighting each other. It would be better to use an IC with open collector outputs. I would just use a transistor instead of an IC though.
Ed