alingment

[cristian anabalon]

how can i recover after accidentally moving a part or shifting part 90 deg.

[Matthew D. Hoedeman]

You will just have to re-measure everything. Of course, you manual alignment, followed by a DCC alignment, should be the first thing you do. Don't ever just use the machine co-ordinates for your alignment.

[JamesMannes]

WELCOME TO THE FORUM!!!


Please see this post first...

http://pcdmisforum.com/showthread.php?t=3139

Then it depends upon which version you are using. Equate alignment works quite well in some versions and not so well in others. Equate alignment is built almost specifically for the accidental bump of the part and subsequent recovery.

[elvis]

You will just have to re-measure everything. Of course, you manual alignment, followed by a DCC alignment, should be the first thing you do. Don't ever just use the machine co-ordinates for your alignment.

hey why is it bad to use machine coords for alignments?
i can think of clearplanes being out of range on our CMM
but whats wrong with doing it?

[Matthew D. Hoedeman]

Well, if you use machine co-ords. for your alignment, then everytime you move the part to a new place on the table, none of your program will be any good, the part would ahve to be in the exact place, every time, and that is impossible. Even if you don't move the part, say it is tied down tight, if you shut off the controller and have to re-home the machine (or re-home for any reason) your machine numbers in relation to where the part is will have changed. The home position will NEVER repeat to the exact same place every time. So, if you have only used machine co-ords, where are you now? An alignment MUST be done on the part, one that can be re-measured for whatever reason and will be the same, every time.

[John Kingston]

It is a lot harder to get repeatabilty. You aren't checking the part in reference to your CMM, you are checking it in reference to the datum scheme on the print.

And what Matt said.

[craiger_ny]

Alignments can be done to machine coordinates. Even if you home out. Part of your measurement routine will need to accomodate this and you will still need to do a part alignment to dimension and find various features but it can be done. Not prudent but there are ways to do it successfully.

I don't do it.

[Matthew D. Hoedeman]

Alignments can be done to machine coordinates. Even if you home out. Part of your measurement routine will need to accomodate this and you will still need to do a part alignment to dimension and find various features but it can be done. Not prudent but there are ways to do it successfully.

I don't do it.

Ah, not I was not saying you CAN'T use the machine co-ords, but that you MUST do an alignment on the part, to the part. You can't use JUST (quote) the machine co-ords. for the alignment.

[craiger_ny]

Machine coordinates alone. No way. I can't see the use.