mtbf has a limited scope. instead, the consideration should be of mttvp - mean time to vanishing profit. the trend seems to be generally in the direction of maximizing the product mttvp=l*mtbf by reducing the cost of l=labor by any means. this has a mixed effct in markets where stockholders are also laborers, but the results are fantastic in areas where investment is segregated from toil.
--- On Sun, 3/25/12, Dave <[email protected]> wrote: > From: Dave <[email protected]> > Subject: Re: [Emc-users] Storebro 260, firstEcounter etc... > To: [email protected] > Date: Sunday, March 25, 2012, 10:54 PM > >>Get acquainted with the > system is a good thing to do if it's > possible, right? > > Well.. if you can get it to run and do what you want > to do with the > existing controls, that is fine. But if I were you I > would use that > opportunity to understand how the turret works, electrically > and > mechanically, how the drives function, how the machine is > shifted - if > it has various ranges, etc and then line up some parts and > time to > retrofit that machine. Assuming you keep the drives, I > would start > looking for spares to keep on the shelf. > > The problem is that when that machine goes down hard, it > will be very > difficult and expensive to get it to run again, unless you > have a cache > of spare boards. So if you take an order to run > on that machine for a > 1000 parts and you are 200 parts into that order and the > machine dies, > you may be in a very bad spot. > > Dave > > > On 3/25/2012 3:50 PM, Roger Holmquist wrote: > > Thanks Dave for your thoughts. > > > > The MTBF-factor is of course a hard caught animal, I > guess I have at > > least two objectives with a project like this: > > 1) Try to make it run by repairing it or work around > it's faults. > > 2) Treat it as an self educational exercise aiming at > more modern > > machines and controls. > > > > This could done I guess, on another machine machine but > if we decide > > to refurbish it with a new control it's good to dig > inte a working > > system because somewhere you have to cut the > wires between the > > control and the machine. > > Get acquainted with the system is a good thing to do if > it's > > possible, right? > > I can observe the behaviour of the switches in the > diagnosispage and > > I think this is a great way to find out how it works, > by observing > > it's various parameters in action. > > You may also monitor the signals on the physical wiring > when the > > system is running making use of logic analyers, > oscilloscopes and > > multimeters. > > Yes, I have a background in repairing electronics, > analogue and > > digital, the analytical way. > > Nonetheless, it still may turn out to be too cumbersome > so doing this > > on a more modern system should probably be a better > investment. > > I'll talk to Johnny about this. > > > > Greetings / Roger > > > > > > > > > > > > > > > > > > 25 mar 2012 kl. 21:13 skrev [email protected]: > > > > > >> I looked at the Siemen website and they only go > back to the Sinumerik > >> 8T. I've deal with some of the hardware that > the 8T used and it was > >> very difficult to make that > >> hardware reliable. Unless you can get that > control to operate > >> properly > >> and find documentation (unlikely) I'd replace it. > >> I've spent days working on old controllers like > that and sometimes > >> they > >> end up working ok for a while, but when you are > done, the best you > >> have > >> is a very old control that is living on the > edge. If it goes down, it > >> tends to stay down and simply become a time eater. > >> > >> Dave > >> > > ----------- > > abCNC > > ----------- > > Roger Holmquist > > Bockarp villa Tallebo > > 59592 Mjölby > > +46-706-250123 > > +46-768-788477 > > +46-142-20542 > > [email protected] > > http://abcnc.se > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > This SF email is sponsosred by: > > Try Windows Azure free for 90 days Click Here > > http://p.sf.net/sfu/sfd2d-msazure > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > ------------------------------------------------------------------------------ > This SF email is sponsosred by: > Try Windows Azure free for 90 days Click Here > http://p.sf.net/sfu/sfd2d-msazure > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
