Bore ID measurement with Renishaw Probe
Is it possible to make a program to have a renishaw probe measure a bore diameter? I have a renishaw probe that came with a Hass VF mill, it has the macros for finding work offsets, I wasn't sure how difficult it would be to make a program to find a bore diameter. My tolerances are not tight, I'm looking for +_.001.
Anyone know of a 3 point bore gauge that is reasonable? This is for a 3.54' ID
You need the software to do it. yes it can be done. I have the Renishaw probe as well on my Mazak VTC. I cannot use it as a measuring device cause I don't have the software but you can buy the add on and it definitely can be done.
Yes, there is a macro for measure its very easy to write you need the book it shows you how.
Not true for Haas machines that came equipped with a probe.
Originally Posted by Hertz
Tyson, send me a PM with your email address and I'll send you both OMP-40 and TS27R manuals. Measuring a bore is dead simple.
Ok. With my machine, the software is an option. I guess with Hass, you get it included. My Mazak was purchased with the probe as well but THAT part was not included. I can certainly probe a hole, it just doesn't measure it for me.
I'd rate this task as not hard at all if you know how to write macros.
That said, I have a big problem using the machine that made a hole to inspect it.
Controlling size, comping for tool wear fine. An actual part measurement, no way I'm going to try this.
You need an outside gauge to verify the machine's zero numbers.
Cutting machines are not measuring tools and the two are designed differently.
Think about something simple like a bad screw bearing on one axis.
If the machine has a problem and is making the wrong size it is going to make the same mistakes when measuring.
I've had a $650,000 grinder happily gauge, comp, and make scrap parts all day long.
There is no way in hell I would trust any machine to final inspect it's own parts.
(Post warning, I build process gauges so my opinion may be a bit skewed.)
+/- 0.001 can be measured with a Mitutoyo dial bore gage with a tenths indicator. You'll need a 3-4" micrometer as well and preferably also a gage block close to 3.54".
Originally Posted by twitte
If you have a Haas with the Renishaw probe factory installed then you can easily measure a bore. It will measure to whatever the capabilities of the machine are. You also have the ability to do a 3 point bore measure where you define what 3 points to measure, though if you are using the Haas VQC to calibrate the probe you will need to make one edit to the macro and recalibrate the probe before using the 3 point bore measure. If you contact Renishaw they can email you a copy of the manual for the probe programs.
Haas machining center equipped with Renishaw software can be used as measuring device. After each cycle the results are stored in macro variables. The size of the feature is always stored in variable #188 (in Haas).
3 point measurment is a bit tricky, as you have to calibrate the probe using different routine. But if your tolerances are as mentioned - just disregard that. The result will be good enough with standard calibration too.
In order to execute it position the probe close to the center of the bore and run the following command:
while A, B and C are the angles at which you want the probe to touch the circle (0 degrees at 9 o'clock, CCW).
At the end of the cycle you will find the actual diameter in #188, and X and Y center coordinates (in current coordinates system) in #185 and #186 respectively.
The closer your initial position is to the real center of the circle, the more accurate ar the results. When looking for high accuracy, I suggest to make several attempts, each time updating the start point according to results in #185 and #186.