Auto Update Feature Noms

[#2#]

Here is my question. I am trying to edit an existing program to run on a very similar part. The part is oriented such that the majority of the differences are in the Y-axis. On many of the features I have done the following.

Originally aligned y=0 to the y-minus face of the part (A1).
Then, measured a bore (feat 1) on the side of the part at y=1.06
Aligned y=0 to feat 1 (A2).
Measured concentric bores within feat 1 (feat 2,3) (x=x, y=0, z=0)

Now, My new part has feat 1 at y=.86

So, I go in and change the nominals of feat 1 to .86 and re-generate the hits. When I do this the only "warning" I get is "Do you want to update the nominals of the related dimensions?" So, then I am thinking that A2 should make the other features runable since they are in the same relation to feat 1 as on the original part. If you scroll through the program they look good (x=x, y=0, z=0).

Next step is to run the program. Feat 1 runs fine but then when it moves on to the other features they are all .2 off (x=x, y=.2, z=0).

Is there a way to get them to stay at x=x, y=0, z=0?

[Paul Barriage]

Have you re-aligned??

From what you typed, they are locators? 1 changed by .86

Did you change the alignment to compensate?
Did you say "Yes" to that warning?

Maybe a sketch or 2 for info?

[#2#]

Have you re-aligned??

From what you typed, they are locators? 1 changed by .86

Did you change the alignment to compensate?
Did you say "Yes" to that warning?

Maybe a sketch or 2 for info?

All I changed was the 1.06 to .86 and updated the hits.

I did nothing to the alignment.

I answered "No" to the warning. It's what I usually answer b/c otherwise my dims get screwed up.

I think I figured it out though. After doing the update but before execution.. I place my cursor on A2 and hit F9 then "OK" I get another warning "Update commands with new part alignment" If I anwer "No" to this feat 2, 3, etc. Stay at x=xxx y=0 z=0.

I would have thought that warning would come up when I change feat 1 though.

[bw_bob]

To be honest the only thing i let PC-DEMONS update is tolerances. If there are alignments ahead of what you answered yes to there is no telling what the software will do. I've screwed up programs answering yes. My .02

[#2#]

To be honest the only thing i let PC-DEMONS update is tolerances. If there are alignments ahead of what you answered yes to there is no telling what the software will do. I've screwed up programs answering yes. My .02

I usually answer no to that one as well. I guess if you don't go through the motions I described when I execute it automatically assumes I would have answered yes! Could be big trouble if I'm not carefull. Now, I suppose I should be paying attention to what it is doing now...

[Matthew D. Hoedeman]

The one and only time you want to say YES to update is if EVERYTHING following the alignment in the program is based upon the locations of the alignment features, not on cad (or print) nominals.

If you do a manual alignment on a fixture, then a DCC alignment, then discover that you offset your Z axis by 50mm too much, when you change the manual alignment Z offset, you will want it to update the features following the alignment so that they will still touch the fixture. However, if you do not do a DCC alignment after the manual and you are measuring a CAD (or print nominal) feature and you discover you offset Z by 50mm too much, you do NOT want to update the features. There are several other example of when you do NOT want to update, but the one I gave is the only one in which you would want to. So, 99.9% of the time, the answer will be NO, do NOT update.