Cool i was looking for video about those kind of probes but many videos just go on and on and at end nothing explained. Now its clear to me. Thanks. Super clear.
I have a working model of a wireless probe using an ATTiny85, and IR LED, IR TSOP1738. It works really well, now I need to finish the housings for the components and finish the PC boards.
Does the probe only work when the circuit opens? From what I know Renishaw triggers when there is a small change in electrical resistance as the rod ever so slightly shifts which in turn reduce the contact patch area between the balls and rod.
I am making one of these right now. One issue that I have is that using 6 balls is actually over-determined. You could remove 3 of them and the rods would be stable. Of course, they wouldn't return reliably. These designs all seem to use a spring to push down on the spindle - seems like what is happening is that this is flexing the rods and their mounts enough to make contact with all 6 balls to complete the circuit.
If the rods were constrained by vertical channel side walls, 3 balls would work with each rod resting on top of a ball, and the contact being rod to ball electrically.
hello, sorry for english, a simple question, does the size of the test probe have to be exactly the same size as the part of the contacts or can it be different? because I think the measurement will have different results from above and from the side. I am wrong?
No. If I understand the question. There will be a bit of movement of the probe tip before the contacts move apart enough to disengage. This will produce some error, but it is consistent error and can be compensated for if measured.
I was looking some musicians forums that use IR they say 2ms is latency and that is much slower then I get over 2.4ghz. Unless there is other method... i saw on ebay some pro 2.000$ probe use it?!
@@darkobul1 if for accuracy a fine probing routine was moving 1in/min. For every 0.0005in (tolerance needed) the probe takes 30 miliseconds or 30,000microseconds. As long as the system response if faster than 30,000 microseconds than it will never be off by more than 0.0005". 5 microseconds is awfully fast, impressive. Both work, but in my opinion much less can interfere with modulated IR light. Radio waves are everywhere.
@@LionSandwich that is good to think about calculation. The cool thing about this way using MCU and wifi conection is that you get hole level of security checks and can add some inteligence to it. I am planning to use small ESP chip in probe with battery and usb charging port. I will do video with my progress. Thanks a bunch for sharing thoight with me.
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Cool i was looking for video about those kind of probes but many videos just go on and on and at end nothing explained.
Now its clear to me. Thanks. Super clear.
It seems that probes are very simple to make, although very precision. Being that they are SO expensive, I think you have the right idea!
I have a working model of a wireless probe using an ATTiny85, and IR LED, IR TSOP1738. It works really well, now I need to finish the housings for the components and finish the PC boards.
Did you finish that? and did you share it somewhere?
Does the probe only work when the circuit opens? From what I know Renishaw triggers when there is a small change in electrical resistance as the rod ever so slightly shifts which in turn reduce the contact patch area between the balls and rod.
Will there be another video about this probe or the process of making it?
I am making one of these right now. One issue that I have is that using 6 balls is actually over-determined. You could remove 3 of them and the rods would be stable. Of course, they wouldn't return reliably. These designs all seem to use a spring to push down on the spindle - seems like what is happening is that this is flexing the rods and their mounts enough to make contact with all 6 balls to complete the circuit.
If the rods were constrained by vertical channel side walls, 3 balls would work with each rod resting on top of a ball, and the contact being rod to ball electrically.
hello, sorry for english, a simple question, does the size of the test probe have to be exactly the same size as the part of the contacts or can it be different? because I think the measurement will have different results from above and from the side. I am wrong?
No.
If I understand the question. There will be a bit of movement of the probe tip before the contacts move apart enough to disengage. This will produce some error, but it is consistent error and can be compensated for if measured.
do you have drawings or anything for this? would love to try building one!
This one was done on the fly. Next one will have plans.
Nice work buddy. If you want more views, feel free to embed your video on our homemade tools forum; looks like you're one of us :-)
I wouldn't mind you posting it. Go for it.
I am thinkering now to make this wireless.
Use IR modulated.
@@LionSandwichis not that too slow? i am testing those cheap wifi modules in special mode i got 5us response time.
I was looking some musicians forums that use IR they say 2ms is latency and that is much slower then I get over 2.4ghz. Unless there is other method... i saw on ebay some pro 2.000$ probe use it?!
@@darkobul1 if for accuracy a fine probing routine was moving 1in/min. For every 0.0005in (tolerance needed) the probe takes 30 miliseconds or 30,000microseconds. As long as the system response if faster than 30,000 microseconds than it will never be off by more than 0.0005". 5 microseconds is awfully fast, impressive.
Both work, but in my opinion much less can interfere with modulated IR light. Radio waves are everywhere.
@@LionSandwich that is good to think about calculation. The cool thing about this way using MCU and wifi conection is that you get hole level of security checks and can add some inteligence to it. I am planning to use small ESP chip in probe with battery and usb charging port. I will do video with my progress. Thanks a bunch for sharing thoight with me.