polygonprofil P3G 10H6

[[ni...]]

Hello,


I'm measuring a polygon profil P3G (DIN 32711) without curve, so in 3 points and I am aligned on the Ø3 (+theorical rotation) who is machined on the same position machine. the Ød5 is 0.009 mm tolerance.

is it possible to make the planar rotation on the P3G itself ? or how would you do mesure the P3G (Ød5)

thanks

P3G.JPGd5.JPG

[[Da...]]

In my opinion, with such a small area of R2 to put points on, 3 Diameter would be the better choice.

[[ni...]]

R2 doesn't exist, the surface is evolutive



I can mesure three circle (with deformation), can I use them to make a new referentiel ? how

3cercles.JPGdeformation.JPG

[[Er...]]

If you don't need to align it to the 3mm hole, I would consider taking points on each side equal distance, and creating a symmetry point. I would loop your base alignment to make sure it aligns accurately, and check the profile accordingly. Hope this helps.

[[Gu...]]

Hello,

did you tried to scan the polygon as a circle and then set it as tangentiel extern and intern (to get d5 / d6) ?
try to scan it slow (maybe 4-5 mm/sec) with lots of points (0.05-0.1 mm/point)

Hope it will help 🙂

Guillaume

[[Mi...]]

You can try following version:

- create 3 circles at the position of R2
- open position with the hole pattern (in german it is called Lochbildeinpassung) an select the 3 circles, on this way you get the new coordinate system Einpassung1
- now create a circle in this new coordinate system (in my example i tried with 3 single points)

[[ni...]]

@ Eric :
good, seems to work, i'll make some repeta and see the delta between old method and yours.

@Guillaume :
no curve no scan on my calypso 😠 😠 😠 😠

@Michael
when I define a point at 0 on system Einpassung1, it's like it is actualy at 0 on Base system !! don't work like I want.
other question, how do you make three circle (or point) with one ony element --Punk1(3)--

Thx

[[Mi...]]

The CAD-Model is drawn at the theoretical values, you cannot see a difference.
We used this several times for hole pattern and we#ve got good an repeatable results.

The 3-Circle-Thing is just a pattern:

[[Gu...]]

For polygon profiles there are ready-to-use CALYPSO programs for evaluation at ZEISS in Oberkochen. These can be purchased via the order programming in Oberkochen.
If you are interested, ask for information on "myPTY" measurement plans

[[Er...]]

Also, if it doesn't need to be aligned to the OD, (it's a profile with no Datums, or only 1 Datum) you could consider aligning to itself using a 3d Best Fit Alignment. Use points from the Profile for the Alignment, and check your profile points to the alignment. It works pretty well.

[[ni...]]

i tried several methode of alignment, the repetability is good for all, but the accuarcy is not good when directly orientated on the P3G. i 'll stiil do the planar rotation on the Ø3.