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Messages - m8298

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11
General Mach Discussion / Re: Help with digitizing/probing
« on: March 24, 2013, 09:20:15 AM »
I am a little confused.  When I am probing, the signal is active high (probe triggers when 5v is present.) The leads inside the probe hold the signal grounded until probe touches. So when I get these "phantom points", it must be seeing 5v.  I understand how this could be noise, but if I put a cap across the input, it'll stay high longer. If it stays high longer, won't the routine fault?  And how would I size the cap to try it?  I keep think I need something inside the probe to hold the signal low better, like pull down resistors.  I just don't know how to wire it.

12
MACH TOOL BOX / Re: 4th axis digitizing WIZARD
« on: March 22, 2013, 08:32:12 PM »
The reason it says that there is no .set file is when you unzip the file, it creates a folder with a sub folder(\4thaxisprobemasterV101\4thaxisprobemaster.) Move everything out of the sub folder and into the main folder(\4thaxisprobemasrV101), then it will work fine.

13
General Mach Discussion / Re: Help with digitizing/probing
« on: March 22, 2013, 10:27:26 AM »
Thanks for the response Gerry. BTW, I still love the screenset.

I don't think I can use a cap. My tool zero plate is active low, and there is a pull-up resistor holding the signal high until the plate is touched. My touch probe, which is using the same input, is active high. If I use a cap the signal would remain high longer, right?  Should I do this a different way?

I have already been thinking about taking a single line of point on my rotary axis.  Then maybe extruding the results and maybe making a wrapped rotary design. At least as a starting point, until I could learn a better way.

14
General Mach Discussion / Help with digitizing/probing
« on: March 21, 2013, 08:36:05 PM »
Hello, I am somewhat new to CNC and I am probably trying to run before learning to walk. I have a home-built 4 axis router table which I have been using for a little while now. I have the 2010 screen set and I have added the laser crosshair xy zero and a z axis zero plate. Now I want to learn all that I can about digitizing. I made the probe and I kinda have it working. I have been trying to use it with the 4th axis digitize wizard. One problem I noticed is it occasionally does a arbitrary point without actually touching. I put a stiffer spring inside the probe, thinking git was from vibration. But it still does it. I also noticed that when this happens it doesn't light up the probe led on the screen like it does when it actually touches. I am sharing port 13 between the tool zero plate and the touch probe(inverting the signal when needed.)  Any ideas what's wrong?  I would also like some idea on how to work with the resulting point clouds.  I would like to be able to take something I turned on my wood lathe, probe the surface on my 4th axis, then convert the point cloud to something I could work with to cut and decorate the surface of the wood turning.  Any help you all could offer is greatly appreciated. 


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