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Re: Anyone live in North Florida or South Georgia?
Glad to help... not a moderator though. Not angling to become one either :) Regards Vedran On Tue, Mar 25, 2025 at 11:23?PM Michael OConnor via <moconnor329=[email protected]> wrote:
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Re: Anyone live in North Florida or South Georgia?
开云体育Thank you Vedran!I didn’t know that Keith Rucker was in Tifton, Georgia. Thought he was in the Carolinas. B That is great to know as it is only 75 miles from our place.? We actually drive through Tifton quite often when we drive to Western NY to visit family. That is where the I-75 interchange is after driving through Georgia backroads.? Have followed Keith Rucker on YouTube and his Vintage Machinery website is a real treasure. Adam Booth is a few hours west in Pensacola, Florida. Was hoping to meet him during a Richard King scraping class a few years ago, but it didn’t happen due to COVID. Vedran, you may be the best Moderator of all time. So knowledgeable in so many areas. You help everyone that you can.? So much respect for you Sir! Kind regards, Mike On Mar 25, 2025, at 6:02?PM, Vedran via groups.io <vedran.groups@...> wrote:
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Re: Anyone live in North Florida or South Georgia?
Just an idea, you have Keith Rucker of Vintage Machinery fame in Tifton, GA I know claiming to "know" someone from watching his videos is naive at best, but he seems to be a decent guy and he often has viewers help him in his restoration of old machines. You might want to try contacting him and see where it goes from there. He's certainly close enough to you. Good luck Regards Vedran On Tue, Mar 25, 2025 at 8:55?PM Bill Nite via <bill431nite=[email protected]> wrote:
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Re: Anyone live in North Florida or South Georgia?
开云体育Hi Bill,Yes, we would have been neighbors. That’s interesting.? Thanks for replying. Seems I am not the only one who would love to find like minded people interested in machining and model engineering. Regards, Mike On Mar 25, 2025, at 3:55?PM, Bill Nite via groups.io <bill431nite@...> wrote:
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Re: V10P Headstock Fiber Gear Replacement
A cardboard box is a workable enclosure, provided you're around to put out a fire should anything go wrong. Soak the inside before printing, you can blast the thing with a hairdryer to get it up to temp quickly. You can add as much surface contact as you need, either with a raft or by adding a solid block under your part. Just make sure you have solid layers on the boundary of the final part and turn the rest off in the lathe. Depending on how good your printer actually is, boring the center hole might not be a bad idea as well. You'll want to print Nylon bone dry... some say even a few hours in the open will turn it into a mess. Larger nozzle is gonna decrease your resolution, which might be counterproductive. Normally you can print 0.25mm layers with 0.4mm nozzle without problems. Also, don't forget the parts shrink somewhat. Depending on your slicer it might be already compensated for, but adding a datum you can measure on the part directly or doing a test piece will let you know for sure. Regards Vedran On Tue, Mar 25, 2025 at 8:57?PM Ryan Harmon via <ryanjharmon1=[email protected]> wrote:
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Re: vfd load reactor suggestions?
I agree with all that Carvel said and would add that sample of 1 (well two in Carl's case) is hardly a representative one. And it works both ways, if say 99% of the motors are known to run for years on VFD without a hitch and you happen to be the owner of the one that packs it up, it's not gonna make a difference to you that the other 99 are fine. As far as I know, there were 3 manufacturers of these motors, in small series over a long time. It's quite possible each unit is completely different in how much VFD (ab)use it can take. Running a VFD adds a bit of risk, but so does running a machine tool at all. You accept it, mitigate it or reject it (by not using a VFD). Unfortunately we don't have good enough data to tell you how big of the risk it actually is. Plan on the contingency where it might be possible your motor burns up. I personally don't think it's a big issue in a hobby shop, but I'm first to point out that my opinion is based more on wishful thinking than on hard data :) Regards Vedran On Tue, Mar 25, 2025 at 5:58?PM Andrei via <calciu1=[email protected]> wrote:
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Re: V10P Headstock Fiber Gear Replacement
Hi Jay, I have a Prusa Mk3s, the original nylon test gear was printed with no enclosure on a warm day with the window open to avoid fumes. That one printed extremely well, but it definitely lulled me into a false sense of confidence on how easy it would be to print the final versions out of nylon. My replica gears for the lathe have much less surface contact with the bed, and I've had some issues with warping, plus some other less than ideal blotches showing up in the prints. The 61 tooth gear (which is the one I really need) is also a lot thicker, which just gives more time for it to cool and have issues. Currently working on improving this, I've been using PEI sheets, a larger nozzle diameter, and a basic enclosure, but it's not quite there yet. It's also getting warmer around here, I may go back to printing it in the open on a hot day just to see if that was the secret to it all ? I've got versions printed out of PETG and I'm tempted to put the lathe back together with those to at least validate my dimensions are correct, but TBD on that. Happy to share the cad/stl files in the meantime if someone else wants to give it a go! Ryan On Tue, Mar 25, 2025 at 2:04?PM Jay via <erik_=[email protected]> wrote:
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Re: Anyone live in North Florida or South Georgia?
Mike,
A few years back I lived in Bradfordville area off US319 and probably would have been close enough to drop by and chat over chips with you, but in 2010 I moved to northeast Georgia. Well Georgia is kinda odd shaped, I’m near the southern northeast corner. I wish I knew of another hobbiest close by.?
Bill Nite V10P |
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Re: vfd load reactor suggestions?
开云体育I can recommend adding a surge protection device at the electric panel for whole house protection.?
https://a.co/d/2GwZnZX
Put one of these on and if your house or utility power supply cable gets hit by lightning, this will save all your appliances and tools. Immediately after the lightning strike remove and replace the protector as it will likely be used up.
Get From: [email protected] <[email protected]> on behalf of cwlathes via groups.io <carvelw@...>
Sent: Tuesday, March 25, 2025 12:47:53 PM To: [email protected] <[email protected]> Subject: Re: [emcoV10lathe] vfd load reactor suggestions? ?
Hi Len
? From: [email protected] [mailto:[email protected]]
On Behalf Of Len Sherman via groups.io ? Maybe I've been living dangerously, but I've run that same motor (on a VP10) from a VFD with no load filter for 10 years with no hint of a problem. I also have a VFD on an old BP clone mill of similar age, also with no issues. |
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Re: vfd load reactor suggestions?
开云体育Hi Len ? From: [email protected] [mailto:[email protected]] On Behalf Of Len Sherman via groups.io ? Maybe I've been living dangerously, but I've run that same motor (on a VP10) from a VFD with no load filter for 10 years with no hint of a problem. I also have a VFD on an old BP clone mill of similar age, also with no issues. |
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Anyone live in North Florida or South Georgia?
Hello Guys,
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Does anyone live in North Florida or South Georgia in the group?
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The past 15 years we have been in the South and away from friends and family where I grew up and worked in Western NY. Haven’t found anyone with similar interests close by.?
We live 20 minutes South of Thomasville, GA in North Florida.
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Been tired of talking to myself and our dogs for awhile now. Anyone close?
?
Regards,
Mike
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Re: vfd load reactor suggestions?
开云体育Hi Ross ? From: [email protected] [mailto:[email protected]] On Behalf Of Morepork via groups.io ? Thanks Carvel, but my question was to Sierra as to the problem he wants to resolve by using a load filter, not what this does.? I'm well versed in principles of filters (reactor/chokes, sine filters, dv/dt filter etc.) being formally trained in power electronics - though this was many years ago:) ? Why I asked Sierra this question is to try to understand if the filter will be used to allow the output from the VDF to be motor friendly, resolve issues with harmonics, or problems with cable resonance from long cable lenghts. This would help in deciding on what filter is require. ? Harmonics will require a sine filter but if you just need to knock of the voltage spikes and so they are not reflected back, thus protecting the motor and VFD, then cheap dv/dt (EMC) filter should work - maybe even just a small inductor could work. Try also to keep the load cable as short as possible.? ? There are are sine filters on Aliexpress if you want to go down that route.? Haven't used them so cant comment on their quality but they seem to be affordable. ? ? Ross |
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Re: vfd load reactor suggestions?
开云体育Hi Vedran ? From: [email protected] [mailto:[email protected]] On Behalf Of Vedran via groups.io ? I'd chisel or hacksaw-off the secondary... 2000V is not something one just shakes off and hobbyists sometimes tend to keep kludges outside of appropriate enclosures. No need to press out what is left of copper inside the core after you cut the exposed parts off. Broken microwaves are regularly found at e-waste and metal scrapping places. Transformers are usually undamaged.? ? When taking one apart there are a few things to know 1. They contain a HV capacitor... usually it has a high value resistor in series so it drains in minutes to hours after being unplugged, but always assume the thing is alive and deadly. These also go up to 2000V. You can use a high value resistor across its terminals to drain the charge but you need to connect it with a known-good insulated pliers or similar tool. If you think the thing is discharged, confirm by sticking something metal across its contacts... needle nose pliers work pretty good. This tool also needs to be well insulated. And if it turns out the thing still has charge, you'll get a loud crack, big spark and a black mark on your tool to remind you of the event. 2. Magnetron contains two big and somewhat powerful ring magnets. These can be extracted, but they are secured with white or pink ceramic heat resistant material. Supposedly white is aluminium based and not particularly dangerous, but pink one is beryllium based and is a big health hazard if you inhale it (in dust form). I'm not sure how much of a risk this is, like if you'd have to sand the thing and sniff the dust or would just breaking the thing apart and being in the same room be enough. I also have no idea if color is actually tightly correlated to the material type, ie. if the white ones are always safe. In any case, do your own diligence if you plan to mess with one. ? Carvel As I understand, MOT cores are made to run on the edge of saturation - they even have magnetic shunts to dump a bit of flux. Does this matters in our case? ? Chris You want magnetic coupling in transformers and in common/differential mode chokes, but not in this case. ? Regards ? Vedran ? ? On Sun, Mar 23, 2025 at 7:58?PM bcstractor via <plaidp=[email protected]> wrote:
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Re: vfd load reactor suggestions?
I have an original (old) emco 240v 3ph motor which I am running via a vfd and I don't want to wipe out the motor's insulation from the vfd spikes. It is an intermittent us hobby machine, from project to project. Sierra
On Sunday, March 23, 2025 at 05:18:41 PM PDT, Morepork via groups.io <ross.a.jennings@...> wrote:
Thanks Carvel, but my question was to Sierra as to the problem he wants to resolve by using a load filter, not what this does.? I'm well versed in principles of filters (reactor/chokes, sine filters, dv/dt filter etc.) being formally trained in power electronics - though this was many years ago:)
?
Why I asked Sierra this question is to try to understand if the filter will be used to allow the output from the VDF to be motor friendly, resolve issues with harmonics, or problems with cable resonance from long cable lenghts. This would help in deciding on what filter is require.
?
Harmonics will require a sine filter but if you just need to knock of the voltage spikes and so they are not reflected back, thus protecting the motor and VFD, then cheap dv/dt (EMC) filter should work - maybe even just a small inductor could work. Try also to keep the load cable as short as possible.?
?
There are are sine filters on Aliexpress if you want to go down that route.? Haven't used them so cant comment on their quality but they seem to be affordable. ?
?
Ross
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Re: vfd load reactor suggestions?
Thanks Carvel, but my question was to Sierra as to the problem he wants to resolve by using a load filter, not what this does.? I'm well versed in principles of filters (reactor/chokes, sine filters, dv/dt filter etc.) being formally trained in power electronics - though this was many years ago:)
?
Why I asked Sierra this question is to try to understand if the filter will be used to allow the output from the VDF to be motor friendly, resolve issues with harmonics, or problems with cable resonance from long cable lenghts. This would help in deciding on what filter is require.
?
Harmonics will require a sine filter but if you just need to knock of the voltage spikes and so they are not reflected back, thus protecting the motor and VFD, then cheap dv/dt (EMC) filter should work - maybe even just a small inductor could work. Try also to keep the load cable as short as possible.?
?
There are are sine filters on Aliexpress if you want to go down that route.? Haven't used them so cant comment on their quality but they seem to be affordable. ?
?
Ross |
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Re: vfd load reactor suggestions?
I'd chisel or hacksaw-off the secondary... 2000V is not something one just shakes off and hobbyists sometimes tend to keep kludges outside of appropriate enclosures. No need to press out what is left of copper inside the core after you cut the exposed parts off. Broken microwaves are regularly found at e-waste and metal scrapping places. Transformers are usually undamaged.? When taking one apart there are a few things to know 1. They contain a HV capacitor... usually it has a high value resistor in series so it drains in minutes to hours after being unplugged, but always assume the thing is alive and deadly. These also go up to 2000V. You can use a high value resistor across its terminals to drain the charge but you need to connect it with a known-good insulated pliers or similar tool. If you think the thing is discharged, confirm by sticking something metal across its contacts... needle nose pliers work pretty good. This tool also needs to be well insulated. And if it turns out the thing still has charge, you'll get a loud crack, big spark and a black mark on your tool to remind you of the event. 2. Magnetron contains two big and somewhat powerful ring magnets. These can be extracted, but they are secured with white or pink ceramic heat resistant material. Supposedly white is aluminium based and not particularly dangerous, but pink one is beryllium based and is a big health hazard if you inhale it (in dust form). I'm not sure how much of a risk this is, like if you'd have to sand the thing and sniff the dust or would just breaking the thing apart and being in the same room be enough. I also have no idea if color is actually tightly correlated to the material type, ie. if the white ones are always safe. In any case, do your own diligence if you plan to mess with one. Carvel As I understand, MOT cores are made to run on the edge of saturation - they even have magnetic shunts to dump a bit of flux. Does this matters in our case? Chris You want magnetic coupling in transformers and in common/differential mode chokes, but not in this case. Regards Vedran On Sun, Mar 23, 2025 at 7:58?PM bcstractor via <plaidp=[email protected]> wrote:
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Re: vfd load reactor suggestions?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of cwlathes via groups.io <carvelw@...>
Sent: Sunday, March 23, 2025 12:47 PM To: [email protected] <[email protected]> Subject: Re: [emcoV10lathe] vfd load reactor suggestions? ?
Hi Bill
? From: [email protected] [mailto:[email protected]]
On Behalf Of Bill Nite via groups.io ? Sierra, ? If you’re looking for cheap, I have a DIY choke idea for you. The concept design came from a project I was researching to convert a straight AC welder to DC output, so the purpose of the choke was to help
smooth the output of a bridge rectifier. I don’t know how if its capabilities falls within the range of what’s needed to protect your motor from the high voltage in your situation, but maybe Carvel or others can chime in to add their expertise to either say
it won’t work, or possibly suggest tweaks to make it work. The design centers around the transformer from a scrap microwave oven. You cut the weld on each side of the transformer that holds the two halves of the laminations together. This allows you to remove
the two coils and replace them with a single coil that can handle the current it needs to pass. In the case of the welder this choke is in series with the stinger of the welder, so it has to carry in the range of 100 to 200 amps, big wire, so you can only
get about 9 wraps of wire, but this was supposedly sufficient. In your case you can use much smaller wire which allows more wraps and as a result better smoothing of the signal. Just thinking off top of my head here, but the primary coil originally in the
transformer might have enough ampacity for your application. Maybe you won’t even have to cut it apart and install a new coil, just wire through the primary side of the transformer. I’m sure that the number of coils affects the inductance, and that in turn
likely affects the frequency that it filters out, but how to figure that out I have no clue.? Bill Nite (knows enough electrical to be dangerous) |
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Re: vfd load reactor suggestions?
开云体育Hi Bill ? From: [email protected] [mailto:[email protected]] On Behalf Of Bill Nite via groups.io ? Sierra, ? If you’re looking for cheap, I have a DIY choke idea for you. The concept design came from a project I was researching to convert a straight AC welder to DC output, so the purpose of the choke was to help smooth the output of a bridge rectifier. I don’t know how if its capabilities falls within the range of what’s needed to protect your motor from the high voltage in your situation, but maybe Carvel or others can chime in to add their expertise to either say it won’t work, or possibly suggest tweaks to make it work. The design centers around the transformer from a scrap microwave oven. You cut the weld on each side of the transformer that holds the two halves of the laminations together. This allows you to remove the two coils and replace them with a single coil that can handle the current it needs to pass. In the case of the welder this choke is in series with the stinger of the welder, so it has to carry in the range of 100 to 200 amps, big wire, so you can only get about 9 wraps of wire, but this was supposedly sufficient. In your case you can use much smaller wire which allows more wraps and as a result better smoothing of the signal. Just thinking off top of my head here, but the primary coil originally in the transformer might have enough ampacity for your application. Maybe you won’t even have to cut it apart and install a new coil, just wire through the primary side of the transformer. I’m sure that the number of coils affects the inductance, and that in turn likely affects the frequency that it filters out, but how to figure that out I have no clue.? Bill Nite (knows enough electrical to be dangerous) |
Jay
Sierra Tunafish Monkeymind
Morepork