I bought some of the proximity detectors for my 3D printer to measure the bed. I tested them on my mill by moving them untillthey tripped, backing off and doing it again to see how repeatable they are. Even the cheap no-=brand unit where as good as my ability to measure them. Set up a test using a dial indicator.
The absolute trip point was some random distance, all you care about is how repeatable they are. The one I liked is mounted in M12x1 threads. I bought am M12x1 tap to make a mounting block The usual connector is called an "Aviation Plug". they come in different diameters and with different amounts of pins. The smaller size is enough for signals and the larger ones can handle motor current. They come in different quality levels too. The cheap Chinese ones are "good enough" but the American ones are precision made and have rubber gaskets. Prices are about $3.50 for the cheap ones (on eBay or Amazon) and about $35 for the best quality ones (at Mc Master Carr and the like). The cheap plugs are made of something like chromed zinc and look cheap but work surprisingly well. The best one are made of machined an green-primmered aluminum and have the quality you'd expect for an $80 per mating par part. They are also sold with engineering-grade plastic housing On Wed, Nov 3, 2021 at 10:01 PM Ralph Stirling < ralph.stirl...@wallawalla.edu> wrote: > I have finally started stripping out the control cabinet on my cnc mill in > preparation for my retrofit. The brushed servos and mechanical limit and > home switches were wired up with crimped "bullet" quick connect pins. I'm > replacing the servos with brushless servos, and am considering replacing > the mechanical switches with inductive prox sensors (pnp, nc type). All > the old wires are sticky with coolant and metal chips. > > So, I am interested to hear what other lcnc retrofitters have found works > well for modest priced coolant proof connectors (3 or 4 pin), and opinions > on cheap Chinese prox sensors (since the name brand ones are so expensive, > even on ebay). An example is: > https://www.ebay.com/itm/US-5Pcs-NC-PNP-LJ18A3-8-Z-AY-Inductive-Proximity-Sensor-Switch-DC6V-36V-/143861840692 > > Photos (rather unorganized) of the retrofit are at: > https://photos.app.goo.gl/yBSRVf3QAVUK39PC7 > > Thanks, > -- Ralph > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
