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Thanks Phil, I was sure I'd heard of them before. In terms of the hydraulics, I work for a hydraulic engineering/fluid power company so you're preaching to the choir, I've had 25 ton jacks that size.

Thanks for all the replies Gents, I'll relay the suggestions back to my customer but he will have to get someone qualified to take a proper look, anything more than a switch is out of my remit.  After reading through the comments I dread to think about the red tape you all must deal with, I...

Hi Guys, I should stress that this is all hypothetical at the moment and is nothing more than an enquiry so don't get too hung up on liability etc. I have no schematics, I have not seen the rig myself and have only discussed it verbally. If it is anything more than a switch then I'm out anyway...

Thanks for the response guys, I am looking into this for a customer of mine. he has a mobile drilling rig that they want to improve the user safety on. Basically there is a function on the rig that requires the operator to push a button which I presume loads the hydraulic system, this button...

Hi Rob, it was more of a general hello and thanks in advance (I guess I should have just written that). But I did post the question below in the main forum: I need a momentary switch that will make contact when pushed but will break the contact immediately even if the button is held in, does...

Since I am not such a bright spark with electronic control I need your help. I can't buy you a beer to say thanks but it's the thought that counts right?

I need a momentary switch that will make contact when pushed but will break the contact immediately even if the button is held in, does such a switch exist? It is for a safety system on a drilling machine and it currently has a three second timer that operates once the button is pressed but the...