Any of you run NC machines in a non climate controlled shop? just wondering if we're the only one out there.

We have a couple of shops non climate controlled with NC machines. They run parts with MAC/DAC greater than +/-.005.
I refer to them as non critical parts such as dog bowls and hamster wheel manufacturers

they want us to hold .001 and wonder why we laugh. Hell, at the price of that machine it should hold .0001.

Holding +/-.001 is nothing more than a wish/ luck and can no way be sustained on an ambient NC machine. Do you have any type of predictable tooling, gage R&R that also associates and supports that type of manufacturing on a consistent level?
More than likely the tight tolerance is set by engineering for MAC when the DAC will be more like .003- .005. Whatever ever it is, it is deceptive from a design or mechanical engineering standpoint of micro management it sounds like to me.

For all the additions. they could have had a new climate controlled shop and a more productive lay out..but that is just my .02

When I was younger I worked in a machine shop that was basically in a tin barn. No A/C and no heat. Felt like standing in front of an oven in summer and coolant would freeze in the winter. Don't remember holding tolerances being an issue. Of course we were making mud pumps and such so tolerances may not have been that critical. Heck, what wasn't done on the CNC machines was done on manual machines that most had tags on them from being an old WWII production machine.

We're still running some bullards and w&s turret and engine lathes. Heck, we still have one machine that was converted to electricity.

NC machines don't require a climate controlled environment judging from shops I've been in over the last 40 yrs.. However I've had aluminum parts grow or shrink from morning to evenings in the summer, up to plus/minus .003..

CNC machines will hold much tighter tolerances.. I had Makino's and Haus machines that could hold .00015
Mostly on precision bores, only way to check that is with air gauges... Requires a top Machinist, not an operator, and a climate controlled environment.. Those CNC machines being primarily a big computer, like it cool also.... Bell helicopter is the one that's a pain in the azz for tight tolerance bores... We made tons of monolithic air frame parts that called for plus/minus .005 on most dimensions.. That was Gravey..