Re: Mini Lathe and Northern Lights
Bright  & shiny here in Northern Ca on friday nite ,
wife said she stayed up last nite & said she didn't catch
anything
On 5/12/24 12:12 PM, Bruce J wrote:
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They were visible here, in Tucson but only with a long exposure;
too much light pollution otherwise. ?This was posted on my local
NextDoor feed. He lives in the foothills above the city. He said
he couldn’t see it with the naked eye, had to take a long
exposure:
No. Too much light pollution at
my QTH in middle TN. ?They were seen north and south
of me. ?I have seen the northern lights here before,
but it was back in the 80’s. ?83, 84 maybe.
Stan?
On Sun, May 12, 2024 at 11:55 AM, davesmith1800 < davesmith1@...>
wrote:
Did
any see northern light running the there mini lathe.?
Dave?
--?
Bruce Johnson
"Wherever you go, there you are." B.
Banzai, PhD
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Re: Mini Lathe and Northern Lights
They were visible here, in Tucson but only with a long exposure; too much light pollution otherwise. ?This was posted on my local NextDoor feed. He lives in the foothills above the city. He said he couldn’t see it with the naked eye, had to take a long exposure:
On May 12, 2024, at 10:05 AM, Stan Gammons via groups.io <buttercup11421@...> wrote:
No. Too much light pollution at my QTH in middle TN. ?They were seen north and south of me. ?I have seen the northern lights here before, but it was back in the 80’s. ?83, 84 maybe.
Stan?
On Sun, May 12, 2024 at 11:55 AM, davesmith1800 < davesmith1@...> wrote: Did any see northern light running the there mini lathe.?
Dave?
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
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Re: Mini Lathe and Northern Lights
I am in California and only see the lights at 2 am and it just a glow.
Dave?
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On Sun, May 12, 2024 at 10:05 AM, Stan Gammons wrote:
No. Too much light pollution at my QTH in middle TN. ?They were seen north and south of me. ?I have seen the northern lights here before, but it was back in the 80’s. ?83, 84 maybe.
?
Stan?
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On Sun, May 12, 2024 at 11:55 AM, davesmith1800 <davesmith1@...> wrote:
Did any see northern light running the there mini lathe.?
Dave?
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Re: Mini Lathe and Northern Lights
No. Too much light pollution at my QTH in middle TN. ?They were seen north and south of me. ?I have seen the northern lights here before, but it was back in the 80’s. ?83, 84 maybe.
Stan?
On Sun, May 12, 2024 at 11:55 AM, davesmith1800 < davesmith1@...> wrote: Did any see northern light running the there mini lathe.?
Dave?
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Mini Lathe and Northern Lights
Did any see northern light running the there mini lathe.?
Dave?
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Yes, easy, where I am going, they don’t have lathe. Celebrating the day with Norwegian waffel. Johannes ? Lavoll. ? ? ? ? ? ? ?
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On 12 May 2024, at 09:37, davesmith1800 <davesmith1@...> wrote:
?Happy Mother's Day
Remember ro take time from the lathe today
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Happy Mother's Day
Remember ro take time from the lathe today
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Re: Mini lathe motor temperature
There one part you do not? see all.
What keeps a group up is posting.?
I have seen Yahoo? groups die because no decision. They so Ridge in subject.??
Other groups I am are very liberal decision subjects.?
Some groups I am at time had no decision on subject but had wide range of off subjects ( home repairs, electronics,? computer,? medical and list goes on)?
Active groups live?
Dave?
FYI?
Putting a temperature gauge on a mini lathe is on subject. It keeos motor from smoking and dieing making for a costly replacement?
Dave?
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On Tue, May 7, 2024 at 09:53 PM, Gerald Feldman wrote:
This “conversation” has been going on for days now and is primarily between two or three individuals who have differing opinions. ?Let’s please give it a rest and move onto something a little more constructive.
?
Thanks,
?
Jerry F.
?
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On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote:
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
I forgot the cold end .
32°F [0°C] is ice cubes in water
Simple to check?
Foundry temperature probes are more fun at 1,450°F [788°C]. I did to by going to potty store and buying the right cone.?
Dave?
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Re: Mini lathe motor temperature
They had interesting questions. There was some repeat questions too. The question I was think someone would ask was on? aluminum tape.? Here the data that make job easy  Dave? My last year project in electronics had over 60,000 views and only 6 ask questions.??
On Tue, May 7, 2024 at 09:53 PM, Gerald Feldman wrote:
This “conversation” has been going on for days now and is primarily between two or three individuals who have differing opinions. ?Let’s please give it a rest and move onto something a little more constructive.
?
Thanks,
?
Jerry F.
?
?
On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote:
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
I forgot the cold end .
32°F [0°C] is ice cubes in water
Simple to check?
Foundry temperature probes are more fun at 1,450°F [788°C]. I did to by going to potty store and buying the right cone.?
Dave?
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Re: Mini lathe motor temperature
This “conversation” has been going on for days now and is primarily between two or three individuals who have differing opinions. ?Let’s please give it a rest and move onto something a little more constructive. ? Thanks, ? Jerry F. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of davesmith1800
Sent: Tuesday, May 07, 2024 12:53 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] Mini lathe motor temperature? On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote: I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”. On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
I forgot the cold end .
32°F [0°C] is ice cubes in water
Simple to check?
Foundry temperature probes are more fun at 1,450°F [788°C]. I did to by going to potty store and buying the right cone.?
Dave?
|
Re: Mini lathe motor temperature
On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote:
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
I forgot the cold end . 32°F [0°C] is ice cubes in water. Simple to check? Foundry temperature probes are more fun at 1,450°F [788°C]. I did to by going to potty store and buying the right cone.? Dave?
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Re: Mini lathe motor temperature
I have over current on my mini lathe too.
Great if turning Plastic,? Aluminum,? Brass and Wood.
If turning steel at lower speeds is where the mini lathe motor is in trouble.?
It is easy to calibrated a temperature gauge that reads at 212° F [100°C] just place the Capillary bulb in boiling water should read? 212° F [100°C] .?
Using a temperature gauge is easy way to save the mini lathe from sending smoke signals saying I am to hot.
Dave?
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On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote:
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
?On Tue, May 7, 2024 at 09:20 AM, Chris Albertson wrote:
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor??
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Re: Mini lathe motor temperature
I use the motor’s built-in over-current sensor. Current equals heat by “i squared r”.
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On May 6, 2024, at 5:02?PM, davesmith1800 via groups.io <davesmith1@...> wrote:
What do you use for protection on your motor?
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Re: Mini lathe motor temperature
On Sun, May 5, 2024 at 08:05 PM, Chris Albertson wrote:
When someone says the motor is at 105 C. ?My question is “How did you calibrate the sensor?” ?Most motors will start to be damaged at 85 C and 105 C is about the limit of what they can take. ? ? I strongly suspect an uncalibrated temperature sensor.
?
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On May 5, 2024, at 10:38?AM, Tony Smith via groups.io <ajsmith1968@...> wrote:
Well it shouldn’t, but I’m not the one trying to measure it.? I don’t know what Dave thinks he’s measuring,?
What do you use for motor protection? Dave?
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? Thanks boys. I have got a lot of suggestions, I am overwhelmed of the response, everyone is correct, however not all are “workable? in this Project . I ended up with a very short drill ?and a center drill from FIRST BROWN TOOLS LTD SHEFFIELD England . Both should be of a better quality. They ?smell correct in original paper box. ? The result is better than necessary. Only 600 holes have to be drilled. ? /johannes Mexico ? ?
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Re: Mini lathe motor temperature
What do you use for protection on your motor?
I use the temperature gauge
Dave?
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On Mon, May 6, 2024 at 01:29 PM, Tony Smith wrote:
Right, and how is slapping a 100°C cut-off switch on the casing going to help you?? If your casing hits 80°C you are probably already screwed.? What part of “the enamel on the coil will start to fail at around 105°C” are you failing to understand?
?
Tony
?
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The best wat is to figure out thd outside temperature is when coil is at 105°C. After researching the problem it was between 15°C and 20°C different.??
Basically thd outside temperature of motor is 90° to 85°C on the outside of case when the coil is 105°C.
Even motor manufacturers figure this out for thermal cut off switches.??
The small high speed motor coil is rotating too.?
You see this calculation in first few posts.
Dave?
On Mon, May 6, 2024 at 10:36 AM, Tony Smith wrote:
Yes, but you need to put your sensor on the coils.?
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Which are on the armature for a brushed motor.?
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Which are spinning around at high speed.
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Can you see the problem?
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Tony
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I tested the gauge with boiling water witch is 100°C. It was on the mark.?
Note: Use distilled water only
If over 500 foot above some correction is need ti temperature.??
Dave?
On Sun, May 5, 2024 at 08:05 PM, Chris Albertson wrote:
When someone says the motor is at 105 C. ?My question is “How did you calibrate the sensor?” ?Most motors will start to be damaged at 85 C and 105 C is about the limit of what they can take. ? ? I strongly suspect an uncalibrated temperature sensor.
?
?
On May 5, 2024, at 10:38?AM, Tony Smith via groups.io <ajsmith1968@...> wrote:
Well it shouldn’t, but I’m not the one trying to measure it.? I don’t know what Dave thinks he’s measuring,?
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Solder lugs & solenoids? .
animal
On 5/6/24 2:33 PM, David Robertson
wrote:
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Sorry to butt in... you can tell essentially all of my PCB
experience is in older pinball machines!!
David
He’s talking about the
older stuff that was laid out on a 2.54mm (1/10”) grid.?
DIP packages are that size, as are most headers.? Of
course there are 1.27mm headers (1/20”) as well.
?
Most newer stuff is
metric, like the 2mm headers, your 4mm headers, as well as
most SMD stuff.? Or mixed, like 2x7mm LEDs with 1/10”
spaced leads.
?
Tony
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Sorry to butt in... you can tell essentially all of my PCB experience is in older pinball machines!!
David
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He’s talking about the older stuff that was laid out on a 2.54mm (1/10”) grid.? DIP packages are that size, as are most headers.? Of course there are 1.27mm headers (1/20”) as well.
?
Most newer stuff is metric, like the 2mm headers, your 4mm headers, as well as most SMD stuff.? Or mixed, like 2x7mm LEDs with 1/10” spaced leads.
?
Tony
?
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Not to be argumentative, but .156 in (common on pin headers) is 4 mm.
Most do not know most holes on pc board are layout in inch.
Dave?
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Actually, while it used to be when Gerber invented the machines and format that everything was in imperial, the current Gerber Layout Format Specifications says:
"Use metric. Imperial is historic and will be deprecated at a future date."
It is fairly easy for most PCB Gerber files to be auto-recognized for units (a drill of 30mils is 0.0300 inches, which is too small to be a metric dimension).
On Mon, May 6, 2024 at 12:56?PM davesmith1800? wrote:
Most do not know most holes on pc board are layout in inch.
--
Buffalo John
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That was true years ago back when ICs were through-hole devices with 0.1 inch pitch where common. ? Times have changed and now ICs are surface mounted with no holes. ? ?But we do still see connectors with 0.1” pitch in prototype and hobby electronics but mainstream parts are now MUCH smaller.
In fact, I’d say that finding an engineer who knows how to work with inches is hard except for some older ones living in the US. ? I may have been the last of the students who still had to work a very few problems in inches and pounds just so that we’d know how. ? This is at UCLA in the 1980s. ?I’ve heard they have stopped doing this., ?Later i ended up teaching some science classes (in the 2010s, in the US), the textbooks were 100% SI units
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Most do not know most holes on pc board are layout in inch.
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davesmith1800
Johannes
BuffaloJohn