what is "remeasure"?

[bob mappes]

question for you gurus out there

What exactly does the "remeasure" do when checking a hole or cylinder ?

I know it is "rechecking" the same feature twice, but what else does it really do? Does it give me "better" results?

It hits the same feature in the same hit points....if it changed where it hits and then averaged the two samplings.....I might see an application for it

thanks guys
bob

[jon_dav_uk]

for example if you are measuring a hole thats out of position, it measures it the first time but obviously if its out of position it pulls some error due to that fact, it then remeasures it again using the x,y,z,i,j,k values it got from the initial measurement thus ensuring a more accurate measurement with minimum cosine error due to the fact the hits were not actually hitting what they were supposed to be.

Back in the old days before the remeasure option was available, I used to always measure a hole then remeasure it using another feature with the target values set to the values of the previous measurement.

Hope this makes sense

Jon

[bob mappes]

but doesn't the "find center" do that for you??.... adjust the actual position before taking the feature hits?

[Matthew D. Hoedeman]

Lots of times, remeasure is quicker. I have seen the FIND function poke and poke for a couple minutes trying to find the hole. Maybe it was because the hole was so small (and this was in a customer supplied program), but I changed it to READ POS and REMEASURE and it was a LOT quicker. Of course, it meant that the operator had to be at the machine, but pretty muchm the operator IS at the machine, so that was no big deal.

[jon_dav_uk]

Yes find centre also does that but due to it only taking three hits, I only trust this feature for doing what i says, ie finding the hole. To get the most accurate measurement, I always use remeasure. If it was a large tolerance I might only use find centre but for the additional time, I normally always just check the remeasure box anyway

[dwade]

When you guys use remeasure, is it better to use theo or not? A lot of the programs here have used theo but I have found sometimes that it throws things off when using that in an alignment.

[dwade]

Remeasure revisited

Am looking for an answer to my question on this topic and would like to know if it is better to use "THEO" or not?????

[JoeRZ]

When programming, I've always plugged in the nominals that is shown on the print and that somehow is captured as THEO or Target. I do this after manual and initial dcc alignment and never had problems (allows me to stay away from the jogbox) - also if do this I won't have to plug in nominals for dimensioning.