Dyna Myte touch probe info requested

[Fastest1]

Did Dyna have a probe and a touch plate? Or did they just use their touch plate turned sideways for X & Y touch off and then lay it on top of the part for Z.

[Fastest1]

Just for general information. The pin ("female" hole actually) at 3 o'clock on the probe connector on the electrical cabinet can be hooked directly to a touch plate (a piece of pc board?) and works very well. Unlike the probes/touch plates I have on my Sherline, the capacitance of your skin will trigger it. You will need some form of insulator (tape/gloves) to allow you to hold it. Works great so far. I am sure the factory probe is not near as sensitive to human touch due to it being a 3 wire connection.

[dave design]

After a bit of effort fabricating an adapter to mount the probe in a 1" EM holder (Renishaw wants about $370 for a CAT40 holder), I now have a working probe. Sort of.
[nomedia="http://www.youtube.com/watch?v=yD5V3qLXRL8"]YouTube - Renishaw MP700 probe on my Dyna Myte mill[/nomedia]

This measurement happened to come out right on size, .4998, but several successive measurements showed a wide deviation, over a thou each way. My measurement speed already very low, only about 1 ipm, but strangely, slowing it down even more has little effect on accuracy. The comp values I have seem to indicate it takes this machine about 350 miliseconds to stop after the probe is triggered. Renishaw says their hardware latency is 40 _micro_seconds or so, so I don't think the problem is there.

This is plenty good enough to locate workpieces, but for accurate measurement or locating bores and other critical features, it's going to be pretty useless.

[Fastest1]

Dave, I have read/heard/been told that running too slow of of a probing speed can actually decrease accuracy. It sounds counterintuitive. I believe it was Roberto @ Dyna that told me that, but dont hold me to it. Ask about probing speeds and see what the opinions are. I really cant remember why but it made sense at the time. It did not seem to be related with noise.

[dave design]

I've goofed around a bit more, the probing feedrate was1ipm, now 4, but still seeing a pretty wide spread. It will hit the numbers bang on 3 times in a row, then I'll see a .003" error! There is a few tenths backlash in the ballscrews, but with single direction positioning at these feedrates, this shouldn't even be an issue.

I'm going to try upgrading to newer Dyna software and a new mobo. Who knows, maybe the faster cpu will cure the latency.

Dave, I have read/heard/been told that running too slow of of a probing speed can actually decrease accuracy. It sounds counterintuitive. I believe it was Roberto @ Dyna that told me that, but dont hold me to it. Ask about probing speeds and see what the opinions are. I really cant remember why but it made sense at the time. It did not seem to be related with noise.

[dave design]

The solution was to slow down the probing feedrate even more. It is now a glacial 5mm/min (.2ipm). I am now seeing measurements consistently within a tenth (.0001). This is better than I expected, given the age and condition of the machine.

I think the optimum probing feedrate has a lot to do with the dynamics of the particular machine. This machine has very powerful axis motors, so it's able to accelerate and decelerate very quickly. At moderate feeds, it's nearly instantaneous, so perhaps the jarring effect of the sudden stop causes the axis to "bounce" a bit. At .2ipm, it's also stopping pretty quickly, but the inertia is so low, there isn't much energy to dissipate. Ah well, nice theory anyway.

I've goofed around a bit more, the probing feedrate was1ipm, now 4, but still seeing a pretty wide spread. It will hit the numbers bang on 3 times in a row, then I'll see a .003" error! There is a few tenths backlash in the ballscrews, but with single direction positioning at these feedrates, this shouldn't even be an issue.

I'm going to try upgrading to newer Dyna software and a new mobo. Who knows, maybe the faster cpu will cure the latency.

[Fastest1]

BTW the tool setter than I got from 2ferrous is an original Dyna unit. It actually has a 5 pin connector of which 4 are used. (white and black) are for the switch and (red and black) are for the LED. The LED takes 5 volts and I am guesing that is what the 5 volt Lambda power supply was in the cabinet for. My question is how do I wire it for the LED to trigger when the tool setter is touched? It is got to be very easy.

[JoseGarrido]

Hello
I have a problem in my "new" Dyna DM4000 in the tool calib, I have the original dyna probe.
When I try to do the tool calib, in the tool 1 the z axis goes to the top position and when I press next doesn't descend, and the same on the rest of the tools.
I think that the problem is in the probe's wiring because the led doesn't light.
Anyone can help me? The wiring from the APU board to the conector is Red and Black for the led pins 1 and 2, White and Green for the probe pins 4 and 5.
This is correct?
Thanks