Probe

Recently i had an idea for a 3d probe construction. As I build everything myself, started making this handful of parts and then assembled. The measure repeatability is within 0.01-0.02mm, which is at the limit, but ok for my purpose. The Ruby tip is 2mm, overall length 79mm and 52mm Diameter

 

 

 

 

tommylight wrote:

Very nice, thank you.

X 2 

That looks like a very thoroughly built probe.

Really cool. Do you read the photodiodes directly? The amplification circuit with a precise comparator to activate the probe with the slightiest change in light is key. Have you measured lobule error? This optical probes have better performance on that that pure kinematic ones, a must for machines without spindle orient.

There are 2 PNP output, light-on (used for the led's) and also dark-on, which trigger probe input. The object to control the lightbeam looks like this, the small diameter is machined 0.25 - 0.3mm. Years ago i did some testing about this, and this design worked well for me.


 


I clamp the probe in oriented position, but it needs compensation. My probing routines can handle multiple probes 4, quadrants error compensated. I use the toolnumber for the compensation file, eg T999, to call the compensation parameter,  'o#5400 call'  does read 999.ngc and loads global variables for this probe. Then the results are repeated within 0.02mm