[Emc-users] Prox sensors and wiring
I think the problem with proxies is that any chips in the probe path is going to affect this distance, quite lilely flood coolant situations. The mechanical switches on CNC machines however, have a slope on the switch and are really difficult to press in with your finger. This makes sure that any junk gets wiped off during the homing process. As can be seen in this image, they often have two or three switches built in; https://za.pinterest.com/pin/531424824774161839/ This allows you to use actuating flags of different lengths to implement; - axis home position - overtravel limit - Estop limit Roland On Thu, 4 Nov 2021 at 10:20, Chris Albertson wrote: > 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 > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Prox sensors and wiring
Hi Andy, I have a box of those connectors in a 6 wide and will get a box of 1 wide and two wide. My thoughts are when used outside in a marine environment to glop some 3M Scotchcoat on them. Of course that make them rather fixed but they are cheap. :-) Dave On 11/4/21 1:44 AM, andy pugh wrote: On Thu, 4 Nov 2021 at 06:30, John Dammeyer wrote: As for connectors, I'd solder and heat shrink to cables if they weren't long enough to reach the cabinet. You can get glue-lined heat-shrink for a truly watertight joint. I bring the prox leads back to a watertight junction box, and in the junction box have these: https://uk.rs-online.com/web/p/pcb-terminal-blocks/8745433/ On a little board in the box. It makes re-connecting a new prox in an awkward position rather less painful. https://photos.app.goo.gl/W85tdizk8BKjV5sf9 Less downtime, as I don't need to find a new mating connector. I might be tempted to use these inside a box now. https://www.amazon.co.uk/gp/product/B08N6G8B1Z ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Prox sensors and wiring
On Thu, 4 Nov 2021 at 06:30, John Dammeyer wrote: > As for connectors, I'd solder and heat shrink to cables if they weren't long > enough to reach the cabinet. You can get glue-lined heat-shrink for a truly watertight joint. I bring the prox leads back to a watertight junction box, and in the junction box have these: https://uk.rs-online.com/web/p/pcb-terminal-blocks/8745433/ On a little board in the box. It makes re-connecting a new prox in an awkward position rather less painful. https://photos.app.goo.gl/W85tdizk8BKjV5sf9 Less downtime, as I don't need to find a new mating connector. I might be tempted to use these inside a box now. https://www.amazon.co.uk/gp/product/B08N6G8B1Z -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Prox sensors and wiring
Or from the servo drive suppliers. In China you can get good quality aviation connectors for like 7usd. That's what I use and I buy cable from them to. I have a guy that buys it all up for me and ships from one place. On Thu, 4 Nov 2021, 21:20 Chris Albertson, wrote: > 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 > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Prox sensors and wiring
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
Re: [Emc-users] Prox sensors and wiring
I bought a number of the prox switches to retrofit the lever micro-switches. Can't find them anywhere at the moment nor can I find who I bought them from. So sad... I did make sure what I ordered could be wiredin the way that a broken wire would be the same as tripping the limit. Also the ability to parallel the switches so the limits at one end of each axis travel could share one input. As for connectors, I'd solder and heat shrink to cables if they weren't long enough to reach the cabinet. Inside the cabinet I'm not sure it matters if the connectors are liquid tight. The AMP CPC connectors can be acquired with an O ring to seal. And if moisture is an issue there are tubes of sealant you can squish into the connection to prevent ingress of fluids. We used the 4 conductor CPC connectors on the back of these lights. The installers dabbed a bit of sealant into the connection. http://www.autoartisans.com/rings/YVR-ORings.jpg The mistake we made with these was to make the lamps airtight and we failed miserably. Air expands as heated during the day and leaves the lamps. Then as it cools the inside because a low pressure zone and air moves back in past leaky gaskets. That is moisture laden evening air. That cycle of pumping air in and out resulted in some of the lamps half filled with water as the water condensed out. Needless to say the leaky lamps PC boards did not survive. We vented the second set and conformal coated the 1500 boards. These did not have any failures over the 5 months they were in operation. http://www.autoartisans.com/rings/Barge1a.jpg John > -Original Message- > From: Ralph Stirling [mailto:ralph.stirl...@wallawalla.edu] > Sent: November-03-21 9:57 PM > To: emc-users@lists.sourceforge.net > Subject: [Emc-users] Prox sensors and wiring > > 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 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Prox sensors and wiring
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
