I am measuring this part right now this is a cylinder about 3 inches tall. The od is dat-b. The top plane is dat-a and dat-c is a slot in the center of the part. The part has 4 counter bore holes along the side of it every 90 degrees. Here is a picture of what the result looks like, and i know its wrong.
Do i need the od dat to be a cylinder or a circle?
Does it matter if its a constructed cyl or an auto cyl?
My dat c is a constructed width, should it be the line instead?
Yeah there should be four, I just have the one in it so its easier to manage tell I figure out how to get the dimensioning correct. Does it matter about my alignment? Do I need to level to the OD cyl dat-b?
or is leveling to the top plane dat-a the same?
Level to -A- whatever it happens to be. You can and will get drasticly different #'s by using different features as you primary Datum. The only time you will not see any different results is when you create a program Offline from a correct cad model. Brushing up on some GD&T may help you out.
So you need to level to -A- PLN, orgin Z to your plane, rotate to your slot -C-, orging XY at -B-.
After you finish your ALign, you create a Cir of the c'bore. Make sure that the cir is directly from your slot, this way you will have it ar exactly X Or Y Zero, and make sure the NOM for your Z value is correct too( very important that all your NOM are correct). Once you do that, copy and paste with pattrn 3times, 90degrees. This will ensure that all your NOM are correct. Once you finish pasting your circles, then you can Report the TP. Select the TP, select options PA and Z. Thats it.
another thing, I never use Xact measure, only Legacy, and I almost never use datums in my TP, instead I align my part to each FCF.
if you follow this, it will work as it should using Legacy
You will find that some of us simply don't trust the Demon to calculate accordingly, so instead I for instance Align my part to the FCF every time. The are maybe a few instances when I use a Datums in my TP, although I still don't trust the result very much, is when there is a modifier to a Secondary or tertiary datum.
So if you don't trust it in Xact measure why are you so confident in Legacy?
I'm not trying to be a pain here just trying to figure out your reasoning?
Using Legacy, you simply Align the part to the FCF, so you don't have to depend on the Demon to Align it for you. Also, IMO, it just so much easier to understand the results when you know that you created the Alignment correct, so all you really looking at is the Actual NOM and Actual deviations.
When you use Xact, you don't really know what is going on, you select your datum's and hoping that it will do the Job for you, and will calculate all the results. It can get pretty confusing with datum shifts and very long results on your report. I don't like confusion, I like simplicity, so that is why I don't use it. Call me old fashioned, dinosaur, I don't care.
