Will it harm this Robinair 15600 pump runing it at full vacuum for 2 hours straight?
Just seems like the pump doesn’t like being pushed that hard, but maybe it’s just me. The pump also gets hot when running at full vacuum for just 45 minutes.
Has new oil, and the pump is new also.
Thanks guys.
I have used cheap hobbyist pumps and have run them for 16 hours plus regurally, you should not have a problem since it is slightly better pump. the pumps I was running, the surface was 190 degreez
my fridge compressor runs without problems and noise for hours on end 
I thought about buying one of those 20_RC51, just heard good things about Robinair so i went that route. I should have probably saved some money by buying a fridge pump 
I do feel better now that I know it was just me getting nervous about running the pump for hours on end.
I’ve got a few of the Robinair 15600’s and I always leave them on until the parts cure- just in case a bag gets a pinhole or something while curing. (Each table has 5 bags that can run at a time) One of the pumps has been running for 3 years now with only oil changes every other month. I’ve even left it on overnight on accident!!! ;o)
Using a dual stage one that I borrow off a friend… always leave it on overnight.
He showed me a setup last weekend, he was vaccing a 6 story building down, pump had already been running for two days, and was still over 3000 microns (want to get down to under 500)… no leak, was just a huge system… so that puppy was going to be working real hard for 4 days.
There vac pumps, they run them solidly all the time, and at a much higher vac than we’re working with (they don’t bother with inches of mercury, anything over 2000 microns is a waste of time to them).
Yeah, i don’t fully understand vacuum or how vacuum can be pulled below 29hg but my vac gauge always bottoms out at the gauge needle stopping point… around 32hg. if that’s true accuracy i don’t know, but it is a good gauge.
vacuum guages are very rarely accurate. the highest possible vacuum you can achieve -30HG, which is basically impossible for any vacuum pump to achieve, a vacuum pump would have to be 100%effecient. pumps can get up -29.9HG, to achieve this you would need absolutely no holes in your bag at all. even one tiny hole can drop the bag pressure down -1hg. rotary vane pumps are some the best pumps
Ignore the gauge, partly because it’s not really that relevant, and partly because it’ll be cheap shit telling you lies
To measure down to microns takes a flash digital gauge that costs a small fortune.
Yeah, and for composite work, 29.9 vs. 29.0 is nothing! We would run parts at 25" indicated at the oven, even though before it was in the oven, the other guage was 29.
Use it for reference. If the only thing is the pump, a hose, and your guage, use that # for when you add a part or 2 on it.
ps: vac. pumps will run hot.
Got pics of this?? What kind of parts are you able to pull from it? Shape and size wise??
I just bought the stuff from joewoodworker.com to add a vacuum controller and MAC valve to my Robinair setup.
http://www.joewoodworker.com/veneering/EVS/wiring.htm
Will post pics and results after I get it setup. Guess it’s a personal thing, don’t like leaving electrical equipment running unattended for long periods of time. Left a small 12V fan running on our boat once this is what happened.
Knotty, maybe if you just set your vacuum pump on a masonry block or concrete… this way no worries about it burning anything. Technically if something electrical overheated too much it should trip the electrical outlet’s circuit breaker.