Re: Brushless mini lathe motor torque chart.
The high speed spindle speed of 2,000 rpm the motor speed is 6,000 rpm is 100 cycles per seconds.
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Low spindle speed of 100 rpm motor is 300 rpm and 5 cycles per seconds.?
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DC motors just adds more voltage to keep same rpm.?
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Hope helps?
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Dave?
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Re: Brushless mini lathe motor torque chart.
I did find a graph for VFD aka brushless motors.??
There two charts one showing at giving frequency the other chart and different frequency/rpm high and low speed.?
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This on the DC pm motor.
Note high speed on this is switch high on left and low on right
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By comparing the charts you figure the correct replacement motor.
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Dave?
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Re: "Jupiter 1" Cutting wheel
Yup! By sharpening the B face, you'll restore the chip clearance that's been abraded away from normal wear.
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It'd probably be worth the nuisance of making some type of guide to keep the same relief angle on all the teeth.
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Roy
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Re: "Jupiter 1" Cutting wheel
Sharpen the "B" face first and see if that doesn't get the job done. if not then sharpen the ?"side. Good luck Johannes!? ?Bill in Boulder
I would recommend making an indexable jig or make a mandrel to hold the cutter in a Spindex, mounted on the bed of a mill, set the proper angles for the sharping process, use a diamond wheel mounted in a mill to sharpen the part.? Some of those angles on the cutting wheel really look beat up. ?
Setting up the part for sharpening will require a bit of ingenuity.? There’s many ways to sharpen the blades.? If it were me I would just junk the thing and replace it with something brand new. Have A Great Day?? Tracy Ranson
My "Jupiter 1"? pencil sharpener?has a 45 mm wheel for cutting.
However, the cuttings are not very good now after many years in use.
So, I am asking you for advice on how to scarp the edge.
The scarp edge of the knife is being a little bit round.?
Look at the pictures,?
Shall I scarp side A or B ?
Ps. Thanks to all for advice on how to make the 2 missing screws.
Johannes
Mexico
?
Attachments:
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Re: "Jupiter 1" Cutting wheel
I would recommend making an indexable jig or make a mandrel to hold the cutter in a Spindex, mounted on the bed of a mill, set the proper angles for the sharping process, use a diamond wheel mounted in a mill to sharpen the part.? Some of those angles on the cutting wheel really look beat up. ?
Setting up the part for sharpening will require a bit of ingenuity.? There’s many ways to sharpen the blades.? If it were me I would just junk the thing and replace it with something brand new. Have A Great Day?? Tracy Ranson
My "Jupiter 1"? pencil sharpener?has a 45 mm wheel for cutting.
However, the cuttings are not very good now after many years in use.
So, I am asking you for advice on how to scarp the edge.
The scarp edge of the knife is being a little bit round.?
Look at the pictures,?
Shall I scarp side A or B ?
Ps. Thanks to all for advice on how to make the 2 missing screws.
Johannes
Mexico
?
Attachments:
|
"Jupiter 1" Cutting wheel
My "Jupiter 1"? pencil sharpener?has a 45 mm wheel for cutting.
However, the cuttings are not very good now after many years in use.
So, I am asking you for advice on how to scarp the edge.
The scarp edge of the knife is being a little bit round.?
Look at the pictures,?
Shall I scarp side A or B ?
Ps. Thanks to all for advice on how to make the 2 missing screws.
Johannes
Mexico
?
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Re: Jupiter 1 , pencil sharpener
Look at a youtube video "restoration of an antique German pencil sharpener". It may help with the shape of your screws. They may even be able to provide you with some measurements of the screws in question if they still have this item. Paul M
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Re: Jupiter 1 , pencil sharpener
Back 1980's a special tap under ?" to made about $100.00.
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Dave?
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On Sun, Jul 28, 2024 at 12:21 AM, DAVID WILLIAMS wrote:
Dear Dave,
?
I know this company has been mentioned before, but it may be worth looking at?
Tracy Tools in the UK ?
www.tracytools.com
I hope this is useful.?
They sell a wide range of odd size taps etc., as well as the usual ones. (I’ve used them for years.) They always seem to include their latest catalogue, which I find useful.
?
David?
?
On 28 Jul 2024, at 03:35, davesmith1800 <davesmith1@...> wrote:
?The biggest problem was taps for odd sizes. The smaller the harder. A large size I can single point.?
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Try this almost all fire hydrant use LH pipe threads but hose are different sizes
The hydrant manufacturers just changed have change the one brass part for different hose sizes.
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It is something you every day and knows of threads.
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Dave?
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On Sat, Jul 27, 2024 at 12:30 PM, Ralph Lehotsky wrote:
Have you looked at Whitworth threads -?
?
https://en.wikipedia.org/wiki/British_Standard_Whitworth
?
From Wikipedia -
?
British Standard Whitworth?(BSW) is an?-based??standard, devised and specified by??in 1841 and later adopted as a?...
?
The Whitworth thread was the world's first national screw thread standard,?devised and specified by??in 1841.
?
Just a thought...
?
ralphie
?
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Re: Jupiter 1 , pencil sharpener
Dear Dave,
I know this company has been mentioned before, but it may be worth looking at? Tracy Tools in the UK ? www.tracytools.com I hope this is useful.? They sell a wide range of odd size taps etc., as well as the usual ones. (I’ve used them for years.) They always seem to include their latest catalogue, which I find useful.
David?
toggle quoted message
Show quoted text
On 28 Jul 2024, at 03:35, davesmith1800 <davesmith1@...> wrote:
? ?The biggest problem was taps for odd sizes. The smaller the harder. A large size I can single point.?
?
Try this almost all fire hydrant use LH pipe threads but hose are different sizes
The hydrant manufacturers just changed have change the one brass part for different hose sizes.
?
It is something you every day and knows of threads.
?
Dave?
?
On Sat, Jul 27, 2024 at 12:30 PM, Ralph Lehotsky wrote:
Have you looked at Whitworth threads -?
?
https://en.wikipedia.org/wiki/British_Standard_Whitworth
?
From Wikipedia -
?
British Standard Whitworth?(BSW) is an?-based??standard, devised and specified by??in 1841 and later adopted as a?...
?
The Whitworth thread was the world's first national screw thread standard,?devised and specified by??in 1841.
?
Just a thought...
?
ralphie
?
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Re: Jupiter 1 , pencil sharpener
?The biggest problem was taps for odd sizes. The smaller the harder. A large size I can single point.?
?
Try this almost all fire hydrant use LH pipe threads but hose are different sizes
The hydrant manufacturers just changed have change the one brass part for different hose sizes.
?
It is something you every day and knows of threads.
?
Dave?
?
On Sat, Jul 27, 2024 at 12:30 PM, Ralph Lehotsky wrote:
Have you looked at Whitworth threads -?
?
https://en.wikipedia.org/wiki/British_Standard_Whitworth
?
From Wikipedia -
?
British Standard Whitworth?(BSW) is an?-based??standard, devised and specified by??in 1841 and later adopted as a?...
?
The Whitworth thread was the world's first national screw thread standard,?devised and specified by??in 1841.
?
Just a thought...
?
ralphie
?
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Re: Jupiter 1 , pencil sharpener
Have you looked at Whitworth threads -?
?
https://en.wikipedia.org/wiki/British_Standard_Whitworth
?
From Wikipedia -
?
British Standard Whitworth?(BSW) is an?-based??standard, devised and specified by??in 1841 and later adopted as a?...
?
The Whitworth thread was the world's first national screw thread standard,?devised and specified by??in 1841.
?
Just a thought...
?
ralphie
?
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Re: Jupiter 1 , pencil sharpener
Interesting . MY tap set has all 8 of the pitches in Pierre's
list below , that set only goes up to 12 mm .? It ca,e to be @ my
first motorcycle which is right @ that time frame . I can look at
just about any SAE bolt & tell ya what pitch it is , I look at
a metric & I'm lost .
thanks
animal
On 7/27/24 3:28 AM, Pierre-Raymond
Rondelle via groups.io wrote:
toggle quoted message
Show quoted text
Metric pitches have changed around 1968 / 1968:
Dia??? old pitch ? ??? current pitch
3mm??? 0.6mm??? ??? ??? 0.50mm
3.5mm 0.7mm??? ??? ??? 0.6mm
4mm??? 0.75mm?? ?????? 0.70mm
5mm??? 0.9mm??????????? 0.8mm
above they didn't change.
On 26.07.24 06:57, Johannes via
groups.io wrote:
Thanks for all the tips.
I put a big
"toothpick" into the hole and twisted, and the best I found
was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls from
Kerry , a 1/8 is very close, and it will be tested out
tomorrow. As you can see from the picture, it is a very short
hole. So, 55 or 60 deg is not so important.
There are
some restorations on YouTube , and I will try to contact them
for a picture of the head of the screw.
Johannes
Mexico
Attachments:
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Re: Jupiter 1, pencil sharpener.
It is problem with old things over 120 years before standards on screws.
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American and UK you can go more. But need American or UK different thread shape.?
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Then two ways to go back to the day built or fin. Something close and re-tap hole and usd today's screws.
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Dave?
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On Fri, Jul 26, 2024 at 07:12 PM, Johannes wrote:
Paul M: I did what you told me. I found a gauge plastic plate from LMS, not used for many years, and tested many screws. All fit in same line : N.F TPI.
So the 2 missing screws have to be there.
So is this correct: 100 years old Hamburg tool factory used
UTS.
Johannes Lavoll.
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Re: Jupiter 1, pencil sharpener.
It gives you an idea but it may not be totally accurate. I assume these screws thread into your gauge. Do they seem to fit fairly well with not too much play? If so, I would try a screw that should work in the holes where the missing screws go. You should be able to determine the correct size by the inside diameter of the holes as compared to your gage. It may be that not all the screws used in this item are fine threaded or even imperial. Hope this helps. Paul M
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Re: Jupiter 1 , pencil sharpener
In addition, if you turn your own screws with an imperial lathe,
make sure that you use a 60° tool, NOT 55°, otherwise, especially
with? small screws, it will easily break.
On 27.07.24 12:28, Pierre-Raymond
Rondelle via groups.io wrote:
toggle quoted message
Show quoted text
Metric pitches have changed around 1968 / 1968:
Dia??? old pitch ? ??? current pitch
3mm??? 0.6mm??? ??? ??? 0.50mm
3.5mm 0.7mm??? ??? ??? 0.6mm
4mm??? 0.75mm?? ?????? 0.70mm
5mm??? 0.9mm??????????? 0.8mm
above they didn't change.
On 26.07.24 06:57, Johannes via
groups.io wrote:
Thanks for all the tips.
I put a
big "toothpick" into the hole and twisted, and the best I
found was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls
from Kerry , a 1/8 is very close, and it will be tested out
tomorrow. As you can see from the picture, it is a very short
hole. So, 55 or 60 deg is not so important.
There are
some restorations on YouTube , and I will try to contact them
for a picture of the head of the screw.
Johannes
Mexico
Attachments:
|
Re: Jupiter 1 , pencil sharpener
Metric pitches have changed around 1968 / 1968:
Dia??? old pitch ? ??? current pitch
3mm??? 0.6mm??? ??? ??? 0.50mm
3.5mm 0.7mm??? ??? ??? 0.6mm
4mm??? 0.75mm?? ?????? 0.70mm
5mm??? 0.9mm??????????? 0.8mm
above they didn't change.
On 26.07.24 06:57, Johannes via
groups.io wrote:
toggle quoted message
Show quoted text
Thanks for all the tips.
I put a big "toothpick" into the hole and twisted, and the best
I found was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls
from Kerry , a 1/8 is very close, and it will be tested out
tomorrow. As you can see from the picture, it is a very short
hole. So, 55 or 60 deg is not so important.
There are some restorations on YouTube , and I will try to
contact them for a picture of the head of the screw.
Johannes
Mexico
Attachments:
|
Re: German screws / pencil sharpener
Hi Dave. I’m in the UK. I left school with an engineering qualification, then it was imperial measurement. I gained an indentured apprenticeship as a precision toolmaker, ?with a European company, hence metric. But at college it was imperial. I can mess it up in either system ? ?????????? Ellis ? ? ? Try working in inch and fraction then metric too.? That what a machinist has to do they use digital inch and convert the rest.
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Jupiter 1, pencil sharpener.
Paul M: I did what you told me. I found a gauge plastic plate from LMS, not used for many years, and tested many screws. All fit in same line : N.F TPI.
So the 2 missing screws have to be there.
So is this correct: 100 years old Hamburg tool factory used
UTS.
Johannes Lavoll.
|
Re: German screws / pencil sharpener
? After reading that I'm a Pirates fan, & not the ball team
??? animal
On 7/26/24 6:52 AM, Bruce J wrote:
toggle quoted message
Show quoted text
I blame the pirates.
On Jul 25, 2024, at 10:57 PM, Peter Kern via
< p.kern@...>
wrote:
On Fri, Jul 26, 2024 at 03:47 AM,
davesmith1800 wrote:
Metric needs to be more friendly and it
would a big winner.
?
The metric was developed for easy
calculations not user friendly?
?
I was born, raised and retired in a metric country.
For me, I can't imagine how to work with
those ugly fractions.
With other words, what you are used to, is user
friendly.?
I expect, if the USA is a small country, Metric will be
standard today.
Peter
--?
Bruce Johnson
"Wherever you go, there you are." B.
Banzai, PhD
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Re: German screws / pencil sharpener
Try working in inch and fraction then metric too.?
That what a machinist has to do they use digital inch and convert the rest.
?
Dave?
?
On Thu, Jul 25, 2024 at 11:24 PM, Peter Kern wrote:
On Fri, Jul 26, 2024 at 03:47 AM, davesmith1800 wrote:
Metric needs to be more friendly and it would a big winner.
?
The metric was developed for easy calculations not user friendly?
?
I was born, raised and retired in a metric country.
For me, I can't imagine how to work with those ugly fractions.
With other words, what you are used to, is user friendly.?
I expect, if the USA is a small country, Metric will be standard today.
Peter
|
davesmith1800
T
Johannes
Ralph Lehotsky
