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Re: Milling on a Mini Lathe

 

My thoughts are that they could be used for end stops or other attachments for fixturing.
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair GPS vs SEXTANT Navigation

 

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Depends on your distance from the equator.? Changes in latitude, changes in attitude.

On 15-Feb-25 10:28, davesmith1800 wrote:

Try this for time and earth 360°
& try this for time at different Latitudes
?
One hour is 1020 miles
?
how about one minute
At 0° = 17 miles in minute
at 35° = 14 miles in minute
at 65° = 7.2 miles in minute
?
.
how about one second
?
At 0° = 0.28 miles in second
at 35° = 0.23 miles in second
at 65° = 0.12 miles in second.
?
35° 0.8192
65° 0.4226
?
If your time is off 5 minute 35° you are 70 miles off
?
Dave
?
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Milling on a Mini Lathe

 

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That may be a standard steel shape that they just buy off the shelf.? Like extrusion profiles, only machined.






On 15-Feb-25 7:49, davesmith1800 wrote:

Any know how this tee slot use for ?
It about Suze if a #6 screw
?
Dave

Re: GPS vs SEXTANT Navigation

 

Try this for time and earth 360°
& try this for time at different Latitudes
?
One hour is 1020 miles
?
how about one minute
At 0° = 17 miles in minute
at 35° = 14 miles in minute
at 65° = 7.2 miles in minute
?
.
how about one second
?
At 0° = 0.28 miles in second
at 35° = 0.23 miles in second
at 65° = 0.12 miles in second.
?
35° 0.8192
65° 0.4226
?
If your time is off 5 minute 35° you are 70 miles off
?
Dave
?
Re: Milling on a Mini Lathe

 

Any know how this tee slot use for ?
It about Suze if a #6 screw
?
Dave

Re: Milling on a Mini Lathe

 

More photos on
mounting the ATTACHMENT?
?
?
?
?

TaigMillingAttachMount.pdf
TaigMillingAttachMount.pdf

Re: Milling on a Mini Lathe

 

Sites for low
cost milling attachment?
?
?
?
?
Walmart?
?
?
Amazon?
?
?
https://www.amazon.com/Vertical-Milling-Slide-Lathe-Machine-Metalworking/dp/B077GP8RN8/ref=asc_df_B077GP8RN8?tag=bingshoppinga-20&linkCode=df0&hvadid=80127036355545&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=m&hvlocint=&hvlocphy=&hvtargid=pla-4583726557729050&psc=1
Projects for Mini Lathes

 

Please? post?sites on projects idea's?
This just found on small lathes projects?
?
http://www.deansphotographica.com/machining/projects/projects.html
Re: Milling on a Mini Lathe

 

Here few more photos off the internet.?
Thd first photos above is one have.
On mine one bolt , I am bolting plate? down though the plate to cross slide .
?
This looks like the purchased?
If notice the bolt to cross are bolt just plate the mill slide bolt plate.
?
?
Milling on a Mini Lathe

 

Here few photos of a setup for milling on a mini lathe .
?
Re: GPS vs SEXTANT Navigation

 

Here little better view of pocket Sextant?
?
?
?
Re: GPS vs SEXTANT Navigation

 

Looking Building a pocket Sextant.
3 to 4" size
Using aluminum, UHMW & brass.
?
With research found most was accurate to 30 to 10 minutes.
Time keeping is one of limiting factors?
?
Using a sprint level with horizon
So can be used on seas , land & air.
It only early days of design. Holding? second of limiting factors?
?
This design making the dial graduation is a lot of work.
?
?
?
This s off shelf protractor with numbers repaing and because thd needs to be 2x see photos below
?
Here off the protractor that will works
?
? ?
?
?
Da
?
?
?
File /5)Charts_&_Tables/8 Hardness Tester.pdf uploaded #file-notice

Group Notification
 

The following items have been added to the Files area of the [email protected] group.

By: davesmith1800 <davesmith1@...>

Description:
No mark hardness tester Also fun project I have had one since the 1970’s

Charts and tables

 
Edited

?
/g/minilathe/files/5%29Charts_&_Tables
For some reason #8 did not downloading to my phone later today turn a real computer and get done. It is on hardness testing?
I like leaves no marks on finished parts.?
?
The biggest cost in the plexiglass tube.
Today I use a ?" diameter ball bearing so if drop on floor I can find the ball.??
At one time I had Rockwell tester but it leaves a mark after testing not good on new parts.
It is nice easy useful project too.?
?
The Mohs hardness is easier for looking for materials scratch and go with magnic. All do is use like pencil of few type of hardness , magnetic and tape and ready for material hunting.?
The magnic is good see steel or not and 300 series and 400. FYI Most avoid 400 and it is magnic will work hardened to glass?
?
Dave?
.?
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuil

 

I do not change much since the? dinosaurs aga other than a lot better graphics.??
?
Dave?
?
On Mon, Feb 10, 2025 at 09:53 AM, Jerry Durand wrote:

Switch Mode Power Supplies have at minimum 20 mS hold-up.? In reality they have more, but not necessarily a lot more.

I built a factory control system for the DOE way back when and used an unregulated "Ugly" brand power supply for the 24V.? BIG transformer, BIGGER capacitors.? Worked great.? Cheap (for the time).

Upper right corner of left enclosure


Me working on version 2.? I said it was way back in time, there are dinosaurs outside!





On 10-Feb-25 20:44, Bill in OKC too via groups.io wrote:
In 1986 I was attending an Army Satellite terminal training class? at Ft. Gordon, GA. Had a bad storm that night that shut down our terminal. I'd been writing a letter on the Heathkit. H89 computer when I left for class. Expected it to be shut down when I got back to the dorm. Nope! The filter caps in that power supply were the size of my fists. It was only a transient power hit, but it took down the relatively modern MILSPEC satellite terminal, and didn't touch the monstrous linear old-school linear power supply.?
?
Bill in OKC?
?
William R. Meyers, MSgt, USAF(Ret.)
?
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuil

 

开云体育

Switch Mode Power Supplies have at minimum 20 mS hold-up.? In reality they have more, but not necessarily a lot more.

I built a factory control system for the DOE way back when and used an unregulated "Ugly" brand power supply for the 24V.? BIG transformer, BIGGER capacitors.? Worked great.? Cheap (for the time).

Upper right corner of left enclosure


Me working on version 2.? I said it was way back in time, there are dinosaurs outside!





On 10-Feb-25 20:44, Bill in OKC too via groups.io wrote:

In 1986 I was attending an Army Satellite terminal training class? at Ft. Gordon, GA. Had a bad storm that night that shut down our terminal. I'd been writing a letter on the Heathkit. H89 computer when I left for class. Expected it to be shut down when I got back to the dorm. Nope! The filter caps in that power supply were the size of my fists. It was only a transient power hit, but it took down the relatively modern MILSPEC satellite terminal, and didn't touch the monstrous linear old-school linear power supply.?

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)


Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuil

 

In 1986 I was attending an Army Satellite terminal training class? at Ft. Gordon, GA. Had a bad storm that night that shut down our terminal. I'd been writing a letter on the Heathkit. H89 computer when I left for class. Expected it to be shut down when I got back to the dorm. Nope! The filter caps in that power supply were the size of my fists. It was only a transient power hit, but it took down the relatively modern MILSPEC satellite terminal, and didn't touch the monstrous linear old-school linear power supply.?

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Monday, February 10, 2025 at 10:41:09 AM CST, Jerry Durand via groups.io <jdurand@...> wrote:


It's what I mentioned about modern power supplies, an inverter welder is
a SMPS (Switched Mode Power Supply).? It converts the mains power to
DC.? Then Switches that at a high frequency.? This means the transformer
is much much smaller.? You won't find big iron transformers in these,
just small ferrite (a magnetic ceramic) transformers.

I remember when these first came out, I worked at a MIL testing lab in
the USA.? We were amazed but concerned that the output voltage wasn't
quite as clean as our big, boat-anchor sized, linear power supplies.


On 10-Feb-25 19:13, davesmith1800 wrote:
> I wonder how make they make inverter welders so light today.
> It was Aluminum winding onsecondary side now they lighter.
> Now it is high frequency is about what know.
> Dave
>
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuil

 

Yep. Higher the frequency the lighter the wiring can be. Back in the day, aircraft electronics were run at 400hz, instead of the 60hz we use in households and industry. Switching would save a lot on expensive materials, but we'd have to remake EVERYTHING!?

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Monday, February 10, 2025 at 10:13:12 AM CST, davesmith1800 <davesmith1@...> wrote:


I wonder how make they make inverter welders so light today.?
?
It was Aluminum winding onsecondary side now they lighter.
?
Now it is high frequency is about what know.?
?
Dave?
?
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuil

 

It's what I mentioned about modern power supplies, an inverter welder is a SMPS (Switched Mode Power Supply).? It converts the mains power to DC.? Then Switches that at a high frequency.? This means the transformer is much much smaller.? You won't find big iron transformers in these, just small ferrite (a magnetic ceramic) transformers.

I remember when these first came out, I worked at a MIL testing lab in the USA.? We were amazed but concerned that the output voltage wasn't quite as clean as our big, boat-anchor sized, linear power supplies.

On 10-Feb-25 19:13, davesmith1800 wrote:
I wonder how make they make inverter welders so light today.
It was Aluminum winding onsecondary side now they lighter.
Now it is high frequency is about what know.
Dave
Re: Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Mini lathe 7 x12 14 8 shop drill press mill wood working sextant clocks gear milling equipment engine tractor rebuilding repair Metal standards

 

I wonder how make they make inverter welders so light today.?
?
It was Aluminum winding onsecondary side now they lighter.
?
Now it is high frequency is about what know.?
?
Dave?
?
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