Temp

[cmmspm]

Hello-

I'm wondering about the temperature of the room that our CMM is in.
I thought I read that the threshold is between 50F and 104F. A few people from my company seem to think that if the room temperature reaches more that 75 that the machine will shut down. Is this possible?? We have a Brown & Sharpe "One" machine.





Thanks,
JC

[Paul Sarrach]

No it won't, but I wish they would. It will run over a hundred degrees. There will be a lot of hits on this thread. In theory you should only check in temps from 68-72. But in reality thats not going to happen. What ever it is it should always stay that temp and have it calibrated at that temp.
Check out the related links below. Theres a lot of opions down there.

[Paul Sarrach]

No it won't, but I wish they would. It will run over a hundred degrees. There will be a lot of hits on this thread. In theory you should only check in temps from 68-72. But in reality thats not going to happen. What ever it is it should always stay that temp and have it calibrated at that temp.
Check out the related links below. Theres a lot of opions down there.

[TRD_racing]

I have asked this question also. I am getting my calibration done tomorrow, and the tech said 68 +3° -1° for my machine. I have a newer type machine. The older machines I am not sure what it is. I will ask again in the morning and post what he says. I had my room set at 70-72° but changed it today to 70-71°. He said this would be better for my application. Hope this helps. I know there are more posts if you look at the bottom under some of those. Cumofo posted some good info a couple of weeks ago.

[rangerboat72]

We don't have a "ONE" machine, but that sounds totally unheard of. I also wish our's would do that. But then again they'd probably put me on third shift when our temperature is at 69-70 degrees. We do not have an insulated roof, so about mid morning the temperature begins to climb to about 74 degrees...

[Paul Barriage]

It should be in your paperwork for the machine. As stated already, if I remember correctly, optimum is 69 +- 3 degrees. This is the range for the guaranteed accuracy of your machine.

Oh, the burden we must bear working with this delicate machinery.


http://baggy3.info/bear2.gif

[Jan d.]

My opinion: if you do NOT have your room at 68, you have NO idea what you're measuring. I do not care what anybody says. Get your room at 68 and keep it there. Forever and ever and ever.... That is the only way to measure anything. Read ISO standard number 1!!!!!!!! It is only 3 lines. And it says the exactly the same thing!

Now, if you have open tolerances and are not interested in what it is that you measure exactly, you can run at any temperature, still producing beautiful charts and numbers that wil impress everyone taking a look at it.

Sorry to sound cynical, but I have so much experience hunting down "problems" that in the end were pure and simple temperature issues, that I just (try to) walk away from moroless people that keep pushing to get room to run at 75 (because otherwise the operator feels cold). Your management invested all this money in a great piece of equipment. Don't they want to know what their parts really look like? It's like buying a Ferrari and then only use it to do groceries and complain that it just doesn't go as fast as advertised.

Bottom line: do all in your power to keep your equipment as close to 68 as you can. And if you have to live with room temperature variances, ALWAYS stay within the published temperature range of the supplier. If your machines operates outside that range, you ought to shut it down. It is a piece of useless clutter.

I wish vendors would shut machines down when the temperature gets outside the max allowable. Now that would be a possitive development in our industry.


Jan.

[bw_bob]

. But in reality thats not going to happen. What ever it is it should always stay that temp and have it calibrated at that temp.
Check out the related links below. Theres a lot of opions down there.

If you spend 137 grand it will.....70f +/-2......45h +/-5...

[Tested]

Jan d.

What ISO STANDARD are you looking at. i.e. ISO/TS?, ISO 9001?

[TRD_racing]

My opinion: if you do NOT have your room at 68, you have NO idea what you're measuring. I do not care what anybody says. Get your room at 68 and keep it there. Forever and ever and ever.... That is the only way to measure anything. Read ISO standard number 1!!!!!!!! It is only 3 lines. And it says the exactly the same thing!

I do agree w/ Jan, but 68° is just to darn cold for me. That is why I bumped my temp up. I do not have any problems holding tight dimensions. My room does stay w/in 1° now. I had it set to stay w/in 2°. The unit may run all the time, but it is constant. I think this is the most important thing, don't let your temp go all over the place. I not good for probe or machine calibration from what the Tech said.

[T Miller]

One more note that you may look into. I had an issue with this once. The air flow - I had it blow across on side of the machine so I could feel it and it messed me up big time could not get anything to run right I had to deflect the air flow down and away from machine

[John Kugler]

One other reason for you. The Y14.5 GD&T standard ALSO says that all GD&Ts are measured at 68°F. That is to keep all measurement practices standardized.

As I understand it, a B&S "One" is a shop floor CMM. It's a lot more robust (although not as accurate) than say most of the machines out there. Does that mean it can handle a larger temperature range? I believe it can, although I'm not positive.

.02 (Italian Lire)
($0.0000132546 usd)

[rangerboat72]

My opinion: if you do NOT have your room at 68, you have NO idea what you're measuring. I do not care what anybody says. Get your room at 68 and keep it there. Forever and ever and ever.... That is the only way to measure anything. Read ISO standard number 1!!!!!!!! It is only 3 lines. And it says the exactly the same thing!

Now, if you have open tolerances and are not interested in what it is that you measure exactly, you can run at any temperature, still producing beautiful charts and numbers that wil impress everyone taking a look at it.

Sorry to sound cynical, but I have so much experience hunting down "problems" that in the end were pure and simple temperature issues, that I just (try to) walk away from moroless people that keep pushing to get room to run at 75 (because otherwise the operator feels cold). Your management invested all this money in a great piece of equipment. Don't they want to know what their parts really look like? It's like buying a Ferrari and then only use it to do groceries and complain that it just doesn't go as fast as advertised.

Bottom line: do all in your power to keep your equipment as close to 68 as you can. And if you have to live with room temperature variances, ALWAYS stay within the published temperature range of the supplier. If your machines operates outside that range, you ought to shut it down. It is a piece of useless clutter.

I wish vendors would shut machines down when the temperature gets outside the max allowable. Now that would be a possitive development in our industry.


Jan.

I agree 110%. Our specification used to be 68+/-1, but there was no way we could keep it there. Upper management just doesn't see the necessity to spend the money to drop the ceiling (and insulate) for our lab that is basicallyin the middle of the shop floor. It's been this way for ten years and I've tried just as long to convince someone that it needs to stay at 68. It's hard enough convincing them that the parts need to climatize for 24hrs prior to measurement.

[Jan d.]

I agree 110%. Our specification used to be 68+/-1, but there was no way we could keep it there. Upper management just doesn't see the necessity to spend the money to drop the ceiling (and insulate) for our lab that is basicallyin the middle of the shop floor. It's been this way for ten years and I've tried just as long to convince someone that it needs to stay at 68.

Suggestion: what worked for me was that at one time I actually pulled the ISO1 standard. With all this 9001 and 14000 stuff going on (giving ISO an air of supreme management credibility), I pulled out ISO1 and said: "Look, here it is, the first thing they ever standardized on! And you think this is NOT important???????". It worked perfectly in my case. Got my room redone and it stayed well within vendor specs since then.


Jan.

[Roger Kilpatrick]

In the fundimental rules in ASMY Y14.5M it states that all dimensions are applicable at 68 degrees F, and all of our drawings reference ASME. My CMM's are in a room on the shop floor with a heating/AC unit that pulls fresh air from outside the building, this room is controled to a temp of 68 - 72. It is pretty much a clean room.