positioning parts for examination

[jamesmrbond007]

I am obviously new at measuring with a romer arm and sometimes i get an irregular part and do not know how i should position it to get the most accurate readings. i like to use our solid marble table as my reference plane, but sometimes i ahve to use planes on the part itself. I am currently working on an end for a steer axle. the part does not sit stable on the table very well and my first time through measuring the part i measured many unconformities. I am hoping it is the way i set the part up rather than the part being a piece of junk.

any help would be great!

brian

[pniven]

Well; James Mr. Bond **007

The part has a strong possibility of being a piece of junk if it should be able to sit flat on your marble table. Without seeing the part and the print or cad file, It would be difficult for me to tell you what to do. I think if it is that bad the only way you could get close is doing your alignment off your part itself. Sorry I could not be of more help!

[cmmguy]

Marble? wtf has happened to this place? Paul it is your fault... it was left in good order and look what you have done to it!!!

[jamesmrbond007]

thanks for your help...i decided it was probably a piece of junk...

[winston]

it could be your surface plate, marble is metamorphosed limestone which is much softer than granite and could be worn, it also reacts vigorously with acid. ;)

[jamesmrbond007]

thanks for the tips....i do think the table needs to be calibrated again...no hope on getting something better im afraid.