Measuring your scanner's accuracy.

[DMC]

Who wants a turn to measure the actual accuracy of your scanner?

It will involve me sending you a dumbell test object, made of metal.

Then, sending me the stl file. I forward it to Germany for inspection against the original CAD of the object.

Anyone?? I did my Steinbichler this morning, and am doing my Medit right now....

Tonight, I can send it to someone to do their scanner. Jason, Bob, anyone feel up to the challange?

Send me your address, and it will be shipped out tonight to ya!

Note: If you drop it, you will be executed before an audience and then burned and your ashes flushed down the toilet!

 

[Marcusthegladiator CDT]

So after they evaluate the STL, are you just informed of the results for fun? Or can you take measures to improve the accuracy other than a in lab calibration?

 

[ParkwayDental]

Im in I will test my D800.

 

[DMC]

OK.

For best results. Make sure the object is 68 degrees F. This is important!

Do NOT shake your countertop that scanner is on.

Nobody walking near the scanner during scanning

Calibrate your scanner before the test.

Have no motors or machines running on your work area. (Vacuums, TVs, Handpieces, etc..)

Place object in the center of your scanner field of view both on X-Y axis, and well as the Z-axis.

Tyler, you will have it tommorow. Thanks for your time by doing this. Do not keep adding scans over and over thinking you are getting extra data. Use the highest setting for data density if you have that option, and the most complex scanning sequence that you may have.

Scott

 

[CoolHandLuke]

you're going to send everyone dildos to scan, arent you.

sick puppy.

 

[DMC]

worse!

Have you seen "Your Highness", the Movie?

 

[CoolHandLuke]

indeed i have. my therapist says i should be OK to go to the theater again soon too.

worst movie ive ever seen.

 

[eyeloveteeth]

i'm in!
...but i can't export my scanned object as .STL - only the designed restoration.

we save them as dicomm and .TRI files - and I have never found a program that would let me convert accurately.

 

[DMC]

You have Matlab (Math Lab) MathWorks - MATLAB and Simulink for Technical Computing

I have a few license of it. As well as a whole bunch of software than can conver the dicom file formats.

I think Matlab can convert it to something??

I assume you meant a DICOM, correct?

.tri is a triangulated file already, jah know? correct?

I'll send you the object, and you can send me whatever you can extract from your PC.

What is the scanner, if you don't mind sharing. Don't tell me it's a CT scanner.

What type of whacked out systems you playing with?

 

[eyeloveteeth]

I COULD send you a CT scan if you want! LOL - decimated of course.

It's extremely whacked out, but it seems to do pretty good.

 

[thewhitelab]

Do you have the results from this mornings test scott? medit/Steinbichler

 

[DMC]

I have a PC to handle it.

No need for decimation. It can be uploaded to One of my servers via FTP X-fer.

You will not be able to scan inside the object anyways, and I think the file size will end up very small, relatively speaking.

Just the fringe would show up. Not inside. Right?

 

[shane williams]

I like this idea!! How do you set this up? How would I get the order set up to scan these balls, I take it there is some kind of calibration software cd that gets sent along with it. Or do I just say I'm scanning an anitomical crown and place your balls in my scanner? Send it to me and my D700, I want to see how bad it really is compared to the ones you sell. I'll P.M you my address.

 

[eyeloveteeth]

Or do I just say I'm scanning an anitomical crown and place your balls in my scanner?

Happy Hump Day!


I assume this is matte and not too reflective? so that I can scan without spraying?

 

[primus]

We call it "Skittles-day" (skeet-skeet)

I hope you guys won't get to offended at the results.

Don't take it personally please. It originally was a $65,000+ Industrial scanner you are up against!

Not a fair fight IMO against little plastic-box technology.

Here are results from my older Steinbichler scanner.....

5-6um accurate!!

Calibration of 'TiltAxis': date: 5/20/2009, time:4:29:25 PM
Standard deviation of matching: 0.00541812 mm


Calibration of 'MagnetAxis': date: 5/20/2009, time:4:29:25 PM
Standard deviation of matching: 0.00639043 mm


Calibration of 'TiltAxis': date: 5/20/2009, time:1:59:12 PM
Standard deviation of matching: 0.00542393 mm


Calibration of 'MagnetAxis': date: 5/20/2009, time:1:59:12 PM
Standard deviation of matching: 0.00639535 mm


Calibration of 'TiltAxis': date: 5/22/2009, time:8:19:44 AM
Standard deviation of matching: 0.00498759 mm


Calibration of 'MagnetAxis': date: 5/22/2009, time:8:19:44 AM
Standard deviation of matching: 0.00593395 mm


Calibration of 'TiltAxis': date: 6/2/2009, time:8:55:15 AM
Standard deviation of matching: 0.00470044 mm

 

[shane williams]

Wow, impressive!

 

[primus]

I like this idea!! How do you set this up? How would I get the order set up to scan these balls, I take it there is some kind of calibration software cd that gets sent along with it. Or do I just say I'm scanning an anitomical crown and place your balls in my scanner? Send it to me and my D700, I want to see how bad it really is compared to the ones you sell. I'll P.M you my address.

We (Ok, actually the Germans) use Matlab and other Industrial inspection software to compare the scan data to the actual shape of object.
It is called a VDI2634 test. It was/is usually preformed by 3rd party.

You would sh1t your pants if I told you how expensive the metal object is. Just use mine, untill someone drops it and ruins it.

 

[primus]

Happy Hump Day!


I assume this is matte and not too reflective? so that I can scan without spraying?

Scan spray??

SCAN SPRAY!!!!

No friggin way Jose! That would completly ruin the test.

Please, nobody touch, or try to clean or do anything at all to the object!

PLEASE! Don;t even look at it very hard. LOL

 

[shane williams]

We call it "Skittles-day" (skeet-skeet)

I hope you guys won't get to offended at the results.

Don't take it personally please. It originally was a $65,000+ Industrial scanner you are up against!

Not a fair fight IMO against little plastic-box technology.

Here are results from my older Steinbichler scanner.....

5-6um accurate!!

Calibration of 'TiltAxis': date: 5/20/2009, time:4:29:25 PM
Standard deviation of matching: 0.00541812 mm


Calibration of 'MagnetAxis': date: 5/20/2009, time:4:29:25 PM
Standard deviation of matching: 0.00639043 mm


Calibration of 'TiltAxis': date: 5/20/2009, time:1:59:12 PM
Standard deviation of matching: 0.00542393 mm


Calibration of 'MagnetAxis': date: 5/20/2009, time:1:59:12 PM
Standard deviation of matching: 0.00639535 mm


Calibration of 'TiltAxis': date: 5/22/2009, time:8:19:44 AM
Standard deviation of matching: 0.00498759 mm


Calibration of 'MagnetAxis': date: 5/22/2009, time:8:19:44 AM
Standard deviation of matching: 0.00593395 mm


Calibration of 'TiltAxis': date: 6/2/2009, time:8:55:15 AM
Standard deviation of matching: 0.00470044 mm

If anyone gets offended by this, they should just punch themselves in the face!! I remember the thread where you were talking about accuracy and how some people were wanting you to prove it, well here it is. I got some thick skin to go along with my thick midsection!! I want to know how bad my scanner stacks up to the best! I'm glad someone is doing this! I'm sure 3Shape wont, but that's there problem I guess, haha! Oh $hit I got a 3Shape, F***!!!!!!

 

[thewhitelab]

and medit?