gene heskett wrote: > On Sunday, July 31, 2011 12:59:28 PM Lester Caine did opine: > >> gene heskett wrote: >>> That junction box on the motor, local made? Neat! >> >> Standard small box ... and a couple of short programs on the mill! >> http://medw.co.uk/wiki/index.php?page=180NcmMotorTermination >> > Thanks, bookmarked. I had not considered the epoxy putty idea as being > usable considering the motors operating temps would tend to soften the > putty. I take it this has not become a problem? How about if the plastic > was swapped out for the smallest die-cast alu? Would thermal expansion > diffs break it loose eventually? Not had any problem with heat cycling. The epoxy putty I've been using is rated at a high temperature, and also insulates the plastic box from the motor. Had a couple of cases where the box has had a clout and been knocked off, but a quick squirt of super glue has fixed that. Some customers drop on a couple of cable ties as well just as extra security from knocks.
> Also, did you clean the side of the motor before sticking on? Mine are, > after all these years, understandably oil covered but I've been hesitant to > clean with anything but the air hose as I didn't want to effect the > lamination layer dielectric and raise the eddy current losses. I'm normally fixing to new motors, and I've converted quite a number. Roughen up the backside of the box and a quick wipe with solvent always seems to work. >> The cable is 16/0.2mm with an overall screen but a lot more flexible >> than the Def Stan 16-2-4C in those pictures ... I don't think it's >> 'oxygen free' credentials apply to use as motor cable though :) > > The cable I use is several awg smaller, comes in 22,24,26 and 28 awg. We > had 24 awg on a 1k foot spool at the tv station and it has worked well, and > is wet noodle flexible. With no red dyes in its fabrication, there are no > built in chemical time bombs. The systems that I've rebuilt here had small in-line connectors in the wires from the motor, and invariably there were intermittent shorts which is what had blown the drivers. So switching to a much tidier cable is always the first step ... before replacing the controller ;) These motors invariably need a little more care on cleaning off any dirt :) -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. Plus, you'll get a chance to win $100 to spend on ThinkGeek. http://p.sf.net/sfu/slashdot-survey _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
