Defining zero datum point in CAT V5 R18 Drafting 2

[blades741]

Hello all,
I started a new job (tool design), and am now back on Catia V5. I'm trying to dimension a group of holes on a welded assembly. There are (4) pads with (3) holes each. I want to specify one of the holes in one of the pads as a datum point for coordinate dimensions, and dimension the other holes from this one that one. I can't seem to change the zero point from the default origin of the CATProduct that I'm trying to dimension.

I tried using the Hole Dimension Table. Using that I can specify the datum point, but the command overall simply does not allow enough flexability to control order of callout (or even decimal places, that I've found yet).

Thank you for any hints or help!

- Bill (suddenly wanting to kick the cat for some reason

 

[HGMorgan]

Hello,
Hole Dimension Table can be a pain, and has some drawbacks, however, we use it all the time and when you set it up right, it works great.
The table works off of part origin, which isn't always where you want your datum point.
1. Create a point at the desired datum.
2. Select all of the holes in the order you want to output them.
3. Select the Hole Dimension Table, then select the datum point created per step 1. You will see the table Axis @ the point.
You can rotate and/or mirror @ this time.
4. Select your text size (can be adjusted later) and decimal places (.xxx can be adjusted to .xx later, but not to .xxxx).
Make all of the table selctions, I.E.; ID, partial holes, etc.
5. Select OK. CATIA will place ID text @ holes and table.

Try this out with just a few holes @ first, once you get used to it, you can create it quickly the way you want.
You can edit table and do quite a lot of info.

Major Drawbacks:
Hole dia only, no tolerance, thread or c'bore/c'sink info.
Will not update. If you change any hole locations in the model, the table will not update the numbers.
The workaround for that: 1 hole, edit the table. A bunch of holes, delete the table and re-do.


Harold G. Morgan
CATIA, QA, CNC & CMM Programmer

 

[blades741]

Thank you Harold, I will play with that a bit and see what I can figure out!

- Bill