cmm room standards

[camaroman]

does anyone know where i can find info on what a cmm rooms has to be at as far as temp and humidity. i'm trying show management that our results will repeat better if we keep a constant and would like to have my ammo before i go to the fight i was always told 68 degrees plus or minus 2 for temp. is there a call out for iso or anything?

thanks

[dph51]

I found this post:

We are setting up a special room for a new CMM machine to measure fixtures and gages for automotive parts. I need to know what the range of relative humidity should be. I know ambient tempature is 68-70 degrees F, but what is range for humidity?

Also does anyone know of any inexpensive instruments for tracking the tempature and humidity that can hook to the PC?

GDTGUY (Aerospace) 5 Feb 03 9:01
ASME B89.6.2-1973, "Temperature and Humidity Environment for Dimensional Measurement" states the following with regard to humidity:

"5.1.2 Humidity. Requirements for humidity control arise from desires to provide human comfort, to prevent deleterious effects of moisture such as corrosion of workpieces and measurement apparatus, and to maintain measurement accuracy of workpieces that are dimensionally sensitive to moisture (for example, certain hygroscopic materials). Specifications for humidity control shall be consistent with the practices established by the American Society of Heating, Refrigeration and Air-conditioning Engineers."


HTH

[lambo]

does anyone know where i can find info on what a cmm rooms has to be at as far as temp and humidity. i'm trying show management that our results will repeat better if we keep a constant and would like to have my ammo before i go to the fight i was always told 68 degrees plus or minus 2 for temp. is there a call out for iso or anything?

thanks

ASME Y14.5M-1994 – Fundamental Rule “k” page 4.
ASME is compatible with the ISO 9000 series of quality standards.

[camaroman]

guess i should get my hands on a ASME book.

[pwhitsa]

20 deg C plus or minus 1 deg C
55% humidity plus or minus 3%
These are standard room specs and will be expensive to achieve.
For everyday inspection temp spec can be extended to plus minus 3 deg and humidity to plus minus 10%.
This can be achieved with a standard commercial "off the shelf" aircon unit.
Another important thing with a cmm installation is isolation from vibration and contamination.

[camaroman]

well we have two chamber pressurized room with pretty elaborate ac and filter set up. floor was'nt poored for a cmm but there are no presses here and the cmm is a pretty small one. our biggest part is 300mm. currently we are having a hard time holding temp and we are having it looked into and the management wanted to know if there was a standard for temp and humidy.

thanks

[Robert Masters]

Suffice to say there are a LOT of CMM’s in environments that don’t come anywhere close to ideal.

When I worked at Sylvania Automotive Lighting, our largest CMM room had an isolation slab built to Sheffield recommendations, and a company from somewhere North East came out and set up a seismometer in several locations during a one week test period.

When a forklift would drive by, we barely met the vibration requirements for Sheffield.

At my last workplace, my machine was sitting on an old part of the factory floor (room built around it) , and the concrete under the machine covered an old railroad track that was not removed.

The first CMM I ever programmed back in 1986 was a manual Cordax 1810 with hard bearings, and 20 feet away was a 5” Shibuara bore mill. The TP-1 would beep away when a steel block was being plowed with a 10” button cutter LOL

[Lab_ratt]

Suffice to say there are a LOT of CMM’s in environments that don’t come anywhere close to ideal.

When I worked at Sylvania Automotive Lighting, our largest CMM room had an isolation slab built to Sheffield recommendations, and a company from somewhere North East came out and set up a seismometer in several locations during a one week test period.

When a forklift would drive by, we barely met the vibration requirements for Sheffield.

At my last workplace, my machine was sitting on an old part of the factory floor (room built around it) , and the concrete under the machine covered an old railroad track that was not removed.

The first CMM I ever programmed back in 1986 was a manual Cordax 1810 with hard bearings, and 20 feet away was a 5” Shibuara bore mill. The TP-1 would beep away when a steel block was being plowed with a 10” button cutter LOL

We have an older Johannson which needed calibrated - flew a guy in from Sweden for 2 freekin weeks, put isolators under machine etc etc. Long story short we never did get it calibrated due to high vibration issue, management lost interest (after spending HUGE $$$). Now it's an extremely large heavy table to put crap on.
This is the kind of thing that happens when the ******** has zero knowledge in CMM's, but figures he needs one anyway. All that really needed done was installing a isolation pad where the machine was to be used. I mentioned this......... and was promptly ignored for my efforts. Only when the tech brought it up was it considered, the outcome being "we really don't use it enough to justify the cost".

[Robert Masters]

Now it's an extremely large heavy table to put crap on.
This is the kind of thing that happens when the ******** has zero knowledge in CMM's, but figures he needs one anyway. All that really needed done was installing a isolation pad where the machine was to be used. I mentioned this......... and was promptly ignored for my efforts. Only when the tech brought it up was it considered, the outcome being "we really don't use it enough to justify the cost".

LOL

I’d say the only real reason I was allowed to do the new CMM room so right was because the company was spending mega-millions on a massive expansion, which was where the new room was going to be. The isolation slab was part of the new construction, so it was a breeze. We also had a Liebert specialist spec out a climate control stystem and they did the installation and tested too. That was a slick room. TONS of space all around the room.

[Robbie Pellerino]

We had a clean room at the Laser Optics plant of my former career - we kept it between 68 - 72° We used a barometer to monitor humidity; stayed around 72% I am trying to replicate same here at our machine shop cmm room

[Tomver]

Our CMM Room is Temp. control ( 20 deg. C +/- 0.5 deg. ) and Humidity control ( 70 % ) and the CMM itself is sitting
on a 90 cu. yards of concrete which is totally separated to the main floor of the room. Just to give you an idea.

[camaroman]

well our facility has no presses ... not really any hylos that come to my building either. our hang up right now is keeping the room at the right temp and humidity. thanks for all the input guys.

[BeckyK]

If you are looking for a temperature and humidity gage, I think we got ours from MSC and it was about $50-$75. We just replace it every year or however long the warrenty /guarentee is. The cost of calibration was about the same or more, so my bosses decided to just buy new. I think automotive doesn't really mandate certain temp & hum., just that it is monitored.

[camaroman]

well we're not auto motive kinda why i was worried about a standard. thought there might be some kind of global standard or something.

[John Kingston]

We had a clean room at the Laser Optics plant of my former career - we kept it between 68 - 72° We used a barometer to monitor humidity; stayed around 72% I am trying to replicate same here at our machine shop cmm room

Wouldn't that be a hygrometer?
Barometers measure atmospheric pressure.