measure spinning part

[schaef]

Hi,

I've been tasked with building a test cart which will be measuring a part that will spin @ 600 mm/second for one revolution.

This part has 30 teeth on it.

I will be using a high speed/high accuracy lazor that will feedback a voltage of 0-10 volts into a 6221 DAQ card (250 000 samples/second)

I need to count each tooth to make sure they are all there and take multiple measurements on each tooth to make sure they are within tolerance.(Length)

I will be using 3 standards that I will teach marginally high, nominal & marginally low tolerances. Once the standards are taught, an operator will load manufactured parts and test to make sure they are good.

I would be very gratefull for any help.

Thanks,

Schaef.

[SnowMule]

Sounds like something an optical inspection system would be better for...

Taken a look at the features of the NI smart cameras?  Just place the item on a conveyor belt or tray and take a picture of it.  There's a bunch of examples very similar to what you're trying to do in the VBAI package.

[Julianne_K]

Hi Schaef, 

Are you looking for assistance with building a LabVIEW program to do this, or do you need more information about which hardware you should use? Thanks, 

[schaef]

Thank you very much for your reply.

I've been told with the angles of the teeth that it would be difficult for a camera to pick up the necessary features to determine whether or not the teeth are at the right length.

Let me back up...I'm measuring the length of the individual teeth on this part. The teeth are at 55 degree angles from the part. They

have a tolerance allowed of +/- 150 micron or 0.150mm. 

Would a camera in your opinion be able to do this?

Thanks again,

[Alain_S]

I'm sorry but your application is not 100% clear to me

"...that will spin @ 600 mm/second for one revolution" :: does that mean that the circumference of the part is 600mm and that it rotates at 1 rotation per second (60 rpm)??

"This part has 30 teeth on it" :: are those 30 teeth, the 30 white crosses on the image? If yes that means that they aren't equally spread around the circumference, right?

"The teeth are at 55 degree angles from the part" :: Where is that angle??

Since this is a round part, I assume that you need to turn it once, capture all your data, analyse it and return a result for that one piece.

With a sampling rate of 250.000S/s you have a resolution of 2µm (600mm/s @ 250.000S/s = 1S every 2µm) while your tolerance is 150µm.

A bit oversampled don't you think?

Do you know a laser with a band with of 250kHz? I don't So please teach me.

I assume you mean a laser displacement sensor?

Camera or laser like you suggested depends on a lot of things:

Stable or rotating system, height difference cilinder/teeth, budget, .... ....