On Wednesday 30 December 2015 12:17:25 andy pugh wrote: > On 30 December 2015 at 16:58, Jon Elson <[email protected]> wrote: > >>> http://www.ebay.com/itm/10pcs-Aviation-Plug-Male-Female-Wire-Panel > >>>-Metal-Connector-16mm-4-Pin-GX16-4-/311141053346?hash=item487173b3a > >>>2:g:aRoAAOSwY45URiPA > > > > You really want gold-plated contacts for things that run at > > relatively low voltages and are not plugged in and out > > frequently. > > I have these on my first CNC conversion, and they haven't caused any > problems, but at the same time I don't like them the way I like the > Neutrik connectors (and Lemo connectors). > > The Neutrik Speakon connectors use multi-leaf silver contacts. How do > they compare in the spectrum of desirability? > (I have only used them for servo motor drives, at about 300V) > > Another option for an A-axis is a hybrid D-sub. That lets you have the > power and data in one connector, all gold-plated. > http://uk.rs-online.com/web/p/solder-d-sub-connectors/5427573/ > The data pins on D-sub are good for 5A, but the big power terminals > can do 40A. An interesting possibility with these connectors is that > they can also have pneumatic inserts, which could be handy for a > clamped A axis. > http://uk.rs-online.com/web/p/d-sub-connector-contacts/6659904/?origin >=PSF_435844|acc
Now that could be handy than bottled beer! My teeny little 4" table only has a single brass screw to do the locking, which isn't really effective for resisting cutting forces. So I pulled it apart, milled an air groove in the base where the table sits on the base casting, and a port in the side for injecting air into, then pulled the center bolt down so it sat fairly solidly. The motor is not capable of moving it when its that tight unless I inject air into it, which both lifts the edge of the table a couple microns, and furnishes an air bearing. So I will have eventually, a lawn tractor sized battery on a smart trickle charger, feeding a relay that runs a compressor to supply that air, which I'll trigger before doing an A move, and turning it off when done. The battery is to run one of those glove pocket sized, cigarette light socket powered inflater gizmo's on a quite intermittent basis. Bench tested, it seems to work, but it has not carved any metal yet so I don't know if that will be enough clamping/braking. Pulling a vacuum I would think would lock it down pretty good, but I've made no provisions for that. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
