Re: [Emc-users] Project Progress
I used the big 1/2" one for the large pocket and the smaller 5mm one for the smaller pocket and profile. The surface finish, given my crappy cast aluminium, was really nice. My mill does have a coolant pump but I don't know if I use the mill often enough to fill the reservoir with coolant that then goes mouldy and stinky. So I'm working on a compressed air mist coolant system. But maybe having a secondary reservoir that pumps out the main one and adds an aquarium bubbler would work for the flood system. So in the last 12 years I've never used coolant. John > -Original Message- > From: andrew beck [mailto:andrewbeck0...@gmail.com] > Sent: November-03-21 10:52 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Project Progress > > What cutters are you using? > > As a sideline here in New Zealand I buy and sell tooling so I'm always > testing the limits. > > And can probably advise a bit > > On Thu, 4 Nov 2021, 11:29 John Dammeyer, wrote: > > > I've been using LCNC quite a bit (for me). In the photo there are two > > steel spring collars that were entirely done with the mill. I could have > > left them as large disks with just a stepped hole and the set screw holes > > but what's the fun in that. > > > > > > http://www.autoartisans.com/mill/SpindleControl/TrialFitOnSpindleCover-1.jpg > > > > The spindle cover casting (10lbs of scrap aluminium) was machined in the > > places I needed flat surfaces and to get rid of a bit of sag in the casting > > mostly for looks. I'd occasionally spray a bit of WD-40 but mostly just > > held the shop vac to clean up the chips. > > > > http://www.autoartisans.com/mill/SpindleControl/SpindleCoverplate-4.jpg > > > > Essentially between 1000 and 2000 RPM, 2 flute 1/2" end mill, 25% step > > over, about 2.5 to 5 IPM IPM and a depth of cut of about 0.1" for each > > pass. This created chips that did not melt onto the tool bit and left a > > quite nice smooth finish. > > > > But with those parameters it did take quite a while. OTOH, it ran > > automatically and other than check on it periodically and vacuum or blow > > away chips I could do other things nearby. > > > > If I enter the parameters into Machinist Toolbox with a target RPM of 1500 > > I see it suggests a tool feed rate of 21 IPM. I think that would melt the > > chips without flood coolant. Since I didn't want to screw it up and have > > to cast it all over again I was very conservative. > > > > Was I too conservative on this? It's been suggested by a friend who runs > > MACH3 that he dials in a much faster feed and spindle rate and then hauls > > back on the sliders to reduce it to very slow and then in small steps bumps > > up the speed until it feels right. > > > > > > > > Suggestions are welcome. > > Thanks > > John > > ___ > > 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 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
Re: [Emc-users] Project Progress
What cutters are you using? As a sideline here in New Zealand I buy and sell tooling so I'm always testing the limits. And can probably advise a bit On Thu, 4 Nov 2021, 11:29 John Dammeyer, wrote: > I've been using LCNC quite a bit (for me). In the photo there are two > steel spring collars that were entirely done with the mill. I could have > left them as large disks with just a stepped hole and the set screw holes > but what's the fun in that. > > > http://www.autoartisans.com/mill/SpindleControl/TrialFitOnSpindleCover-1.jpg > > The spindle cover casting (10lbs of scrap aluminium) was machined in the > places I needed flat surfaces and to get rid of a bit of sag in the casting > mostly for looks. I'd occasionally spray a bit of WD-40 but mostly just > held the shop vac to clean up the chips. > > http://www.autoartisans.com/mill/SpindleControl/SpindleCoverplate-4.jpg > > Essentially between 1000 and 2000 RPM, 2 flute 1/2" end mill, 25% step > over, about 2.5 to 5 IPM IPM and a depth of cut of about 0.1" for each > pass. This created chips that did not melt onto the tool bit and left a > quite nice smooth finish. > > But with those parameters it did take quite a while. OTOH, it ran > automatically and other than check on it periodically and vacuum or blow > away chips I could do other things nearby. > > If I enter the parameters into Machinist Toolbox with a target RPM of 1500 > I see it suggests a tool feed rate of 21 IPM. I think that would melt the > chips without flood coolant. Since I didn't want to screw it up and have > to cast it all over again I was very conservative. > > Was I too conservative on this? It's been suggested by a friend who runs > MACH3 that he dials in a much faster feed and spindle rate and then hauls > back on the sliders to reduce it to very slow and then in small steps bumps > up the speed until it feels right. > > > > Suggestions are welcome. > Thanks > John > ___ > 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
[Emc-users] Project Progress
I've been using LCNC quite a bit (for me). In the photo there are two steel spring collars that were entirely done with the mill. I could have left them as large disks with just a stepped hole and the set screw holes but what's the fun in that. http://www.autoartisans.com/mill/SpindleControl/TrialFitOnSpindleCover-1.jpg The spindle cover casting (10lbs of scrap aluminium) was machined in the places I needed flat surfaces and to get rid of a bit of sag in the casting mostly for looks. I'd occasionally spray a bit of WD-40 but mostly just held the shop vac to clean up the chips. http://www.autoartisans.com/mill/SpindleControl/SpindleCoverplate-4.jpg Essentially between 1000 and 2000 RPM, 2 flute 1/2" end mill, 25% step over, about 2.5 to 5 IPM IPM and a depth of cut of about 0.1" for each pass. This created chips that did not melt onto the tool bit and left a quite nice smooth finish. But with those parameters it did take quite a while. OTOH, it ran automatically and other than check on it periodically and vacuum or blow away chips I could do other things nearby. If I enter the parameters into Machinist Toolbox with a target RPM of 1500 I see it suggests a tool feed rate of 21 IPM. I think that would melt the chips without flood coolant. Since I didn't want to screw it up and have to cast it all over again I was very conservative. Was I too conservative on this? It's been suggested by a friend who runs MACH3 that he dials in a much faster feed and spindle rate and then hauls back on the sliders to reduce it to very slow and then in small steps bumps up the speed until it feels right. Suggestions are welcome. Thanks John ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
