Time delay door interlocks

gregormarwick · Dec 24, 2020

We had an inspection from HSE (our equivalent of OSHA I suppose) last week for the first time in a good number of years. One complaint that they have followed up with is that our machines do not have a time delay after the cycle finishes before they unlock the door. This supposedly to allow coolant mist to settle and prevent operator exposure. We have filter extractors on most of our machines, but whatever, little point in arguing with them.

I have never come across a machine that has a time delay on the door interlock, is this actually a thing that exists? Our newest machine is a DMG Mori, it was installed around May/June this year and it doesn't have an interlock delay.

I have a strong suspicion that this is just some fantasy invented by some idiot in their ranks. If I can demonstrate that nobody actually makes machines that do that then I will happily tell them so.

yardbird · Dec 24, 2020

None of our stuff has this. Curious how long of a delay they think is sufficient?

I'd think they'd be on you to add more exhaust suck, help the whole building.

Ain't no wonder why everyone is going to robots.

Brent

DouglasJRizzo · Dec 24, 2020

gregormarwick said:
We had an inspection from HSE (our equivalent of OSHA I suppose) last week for the first time in a good number of years. One complaint that they have followed up with is that our machines do not have a time delay after the cycle finishes before they unlock the door. This supposedly to allow coolant mist to settle and prevent operator exposure. We have filter extractors on most of our machines, but whatever, little point in arguing with them.

I have never come across a machine that has a time delay on the door interlock, is this actually a thing that exists? Our newest machine is a DMG Mori, it was installed around May/June this year and it doesn't have an interlock delay.

I have a strong suspicion that this is just some fantasy invented by some idiot in their ranks. If I can demonstrate that nobody actually makes machines that do that then I will happily tell them so.

Having worked for a MTB, I can tell you I've never seen that. Even on machines with VERY high speed capability.

Hardplates · Dec 24, 2020

Just when you think you have met the dumberest person on earth, in walks a new contender....... :rolleyes5:

ChipSplitter · Dec 24, 2020

It's to keep the gender-studies-graduate operator from licking the coolant.

Don't be silly, there's a purpose for everything.

Guest · Dec 24, 2020

That sounds like something a building inspector in a California city would pull out of his butt.

gregormarwick · Dec 24, 2020

yardbird said:
Curious how long of a delay they think is sufficient?

Unspecified.

I suppose I should calculate how many nanoseconds it takes for the signal to propagate to the interlock and ask if that's good enough.

Need to go and get a tape measure...

Mike1974 · Dec 24, 2020

Funny thing. Our new haas have the autodoors... Not a dang thing that keeps operator from sticking hand in between doors when shutting.

Other than plastic gear and rack stripping out before breaking bones

Mike1974 · Dec 24, 2020

I imagine if for some stupid reason you had your head in there and hit cycle start your would get a nice goose egg or worse

Hardplates · Dec 24, 2020

ChipSplitter said:
It's to keep the gender-studies-graduate operator from licking the coolant.

Don't be silly, there's a purpose for everything.

Don't confuse reason with purpose. There is a reason for everything. Purpose implies significance which is severely lacking in this day and age.

One could even say there are more porpoises than purposes

Dan from Oakland · Dec 25, 2020

I had a friend who owned a candy store- when he saw the health inspector coming, he threw a piece of candy on the floor and stepped on it. Got written up for it, my friend said he was sorry, the inspector puffed up his chest and dislocated his shoulder patting himself on his back and left. Sometimes you just gotta play the game.

metalpyro · Dec 25, 2020

Dan from Oakland said:
I had a friend who owned a candy store- when he saw the health inspector coming, he threw a piece of candy on the floor and stepped on it. Got written up for it, my friend said he was sorry, the inspector puffed up his chest and dislocated his shoulder patting himself on his back and left. Sometimes you just gotta play the game.

Same thing with the Fire Dept Inspectors. When they show up out of the blue, I tell them I don't have time right now. Let's make an appointment for next week. It gives me time to pre-clean and stage the scene. I purposely let my extinguishers expire* and leave some rags around the shop. They write me up for house keeping and expired tags and leave happy as they "got" another miscreant. I refer to that as leaving some low hanging fruit. They got me for something and didn't go for a deep dive.

* My fire extinguishers are maintained by a good customer, who is a licensed fire extinguisher contractor & insists that extinguishers don't need annual servicing.

CarbideBob · Dec 25, 2020

This strange to me.
Ask for a copy of the written rule book section where this is mandated.
Timed hit the button and to door locks are common in robotic work cells for start up but I have never seen this end of cycle thing.
Bob

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