Dave,
I'm not sure that all of you guys on this list are aware of the fact
that the US has introduced metric units since a long time.
In 1866 Congress voted for the metric system, and in 1894 again
administration passed bills in that direction. Only in 1975, President
Gerald Ford signed the
On 06/16/2012 09:41 AM, gene heskett wrote:
On Saturday, June 16, 2012 12:31:47 PM Peter Blodow did opine:
Dave,
funny thing is that European lathes in those days you were describing,
many still working today, were equipped with inch lead screws, so that
in order to cut mm threads they have
On 06/16/2012 12:52 PM, Kent A. Reed wrote:
On 6/16/2012 2:54 PM, andy pugh wrote:
On 16 June 2012 18:48, Davee...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as
On 06/16/2012 03:21 PM, andy pugh wrote:
On 16 June 2012 21:25, Peter Blodowp.blo...@dreki.de wrote:
Except that hecto and centi are _not_ prefixes in the SI system.
Yes they are. Hekto-, deka-, deci- and centi- (100, 10, 1/10, 1/100
rsp.) are the only ones with the decimal exponents not
]
Sent: Friday, June 15, 2012 1:41 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Brushless Servo Selection?
On Fri, 2012-06-15 at 10:53 +0100, andy pugh wrote:
On 15 June 2012 06:58, Viesturs Lācis viesturs.la...@gmail.com wrote:
Unfortunately it requires relatively larger
Todd Zuercher wrote:
Trying to get this thread back on topic since it was hijacked by the metric
system.
To run one of these Keling motors how big would the motor cabling need to be?
Will it have to be rated for 30 amps? That’s pretty big wire. Or would it
only need to be rated for the
I think I have found the motors I would like to use.
http://www.ebay.com/itm/ElectroCraft-XBR-2910-Nema34-Brushless-AC-Servo-
Motors-w-Encoders-CNC-/221048834843?pt=LH_DefaultDomain_0hash=item33778
98b1b
Now I need to figure out what drives I would like to use and the power
supply.
How much
On 18 June 2012 22:51, Todd Zuercher to...@pgrahamdunn.com wrote:
I think I have found the motors I would like to use.
http://www.ebay.com/itm/ElectroCraft-XBR-2910-Nema34-Brushless-AC-Servo-
Motors-w-Encoders-CNC-/221048834843?pt=LH_DefaultDomain_0hash=item33778
98b1b
Do you have a spec?
Todd Zuercher wrote:
I think I have found the motors I would like to use.
http://www.ebay.com/itm/ElectroCraft-XBR-2910-Nema34-Brushless-AC-Servo-
Motors-w-Encoders-CNC-/221048834843?pt=LH_DefaultDomain_0hash=item33778
98b1b
Now I need to figure out what drives I would like to use and the
On 17 June 2012 09:09, Steve Blackmore st...@pilotltd.net wrote:
Pipe threads are Imperial Units - BSP (British Standard Pipe) and have a
Whitworth thread form.
Whitworth thread has a 55 degree thread angle. This is better than a
60 degree angle, but harder to draw.
(Whitworth calculated that
On 6/16/2012 2:54 PM, andy pugh wrote:
On 16 June 2012 18:48, Davee...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
On Sunday, June 17, 2012 02:01:11 PM Dave did opine:
On 6/16/2012 2:54 PM, andy pugh wrote:
On 16 June 2012 18:48, Davee...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around
here
has a clue what a hectar is, not even me.
I think that Hectars
Andy,
way back in my school time, curriculum makers detected that mass and
force are different things. Before, forces were expressed in mass units,
i.e., kilogramms (greek: chilioi = thousand, gramma = weight), and
sometimes called kilogrammforce, which gives roughly identical figures
for
On 16 June 2012 08:22, Peter Blodow p.blo...@dreki.de wrote:
Now, your dad must have a pretty old car since this cgs system was
abandoned in 1978. Are you sure that the above explanation is right, or
is it rather the kiloDekaNewtonMeter?
Thinking back, it was actuality the rating of the
I was in engineering college from 76 to 81 and remember some discussion
about this. Fortunately there was not too much to discuss
as they had already decided that SI was the way to go and we had
recently selected new books. At the same time the metric
revolution was in full swing and they
On Sat, Jun 16, 2012 at 9:31 AM, Dave e...@dc9.tzo.com wrote:
The school was very unique in that they encouraged students to use the
machines and the facilities after hours. They had a shop supervisor who
was paid to stay late most weekday nights. Even the garage was
available, so we could
On 16 June 2012 14:46, Eric Keller eekel...@psu.edu wrote:
a mechanical engineering school of any merit should have student
shops.
We had a machine shop course as part of my Physics degree. The theory
was that we were likely to be having experimental rigs built, and
having some concept of
On 16 June 2012 08:22, Peter Blodow p.blo...@dreki.de wrote:
To express angular momentum, we have to multiply force by the length of
the lever, i.e. one meter. So we arrive at the unit DNm = 10 Nm ^= 1
kpm, and the world is in almost perfect order again.
There is a similar situation with the
On 15 June 2012 18:40, Kirk Wallace kwall...@wallacecompany.com wrote:
48 Volts or rather -48 Volts DC is common for telephone equipment, so
there may be cheap supplies available, if one knows where to look.
Very cheap indeed are these fruit machine power supplies:
On 6/16/2012 11:02 AM, andy pugh wrote:
On 15 June 2012 18:40, Kirk Wallacekwall...@wallacecompany.com wrote:
48 Volts or rather -48 Volts DC is common for telephone equipment, so
there may be cheap supplies available, if one knows where to look.
Very cheap indeed are these fruit
On 6/16/2012 9:46 AM, Eric Keller wrote:
On Sat, Jun 16, 2012 at 9:31 AM, Davee...@dc9.tzo.com wrote:
The school was very unique in that they encouraged students to use the
machines and the facilities after hours. They had a shop supervisor who
was paid to stay late most weekday
Fruit machines?? What is a fruit machine?
Do you know what we call them in the US?
Dave
Slot Machine or One arm bandit I think.
Fruit machine is from graphics commonly used on the rotating drums.
I note the supplies are multi-output switchers. The cross-regulation between
different
Andy,
1 Pa = 1 N/sq. meter, a very impractical unit. Therefore, the bar as
the most commonly used pressure unit of today, not a SI unit, is only
accepted as an exception to be near the previously used atmosphere = 1
kp/sq.cm.
1 hPa (hectoPascal) = 100 Pa (greek: hekaton = hundred). The heck
Dave,
funny thing is that European lathes in those days you were describing,
many still working today, were equipped with inch lead screws, so that
in order to cut mm threads they have to use a 127 teeth gear in the gear
case to drive the lead screw. This way, our industry wanted to become
On Saturday, June 16, 2012 12:14:55 PM Eric Keller did opine:
On Sat, Jun 16, 2012 at 9:31 AM, Dave e...@dc9.tzo.com wrote:
The school was very unique in that they encouraged students to use the
machines and the facilities after hours. They had a shop supervisor
who was paid to stay late
You can't save anybody from himself, but I understand that nobody will
be made responsible for the stupid killing themselves. This is the
consequence of today's holy law that nowadays nothing can happen
without someone being responsible (even if nobody really is). Makes a
lot of money for the
On Saturday, June 16, 2012 12:27:40 PM andy pugh did opine:
On 15 June 2012 18:40, Kirk Wallace kwall...@wallacecompany.com wrote:
48 Volts or rather -48 Volts DC is common for telephone equipment, so
there may be cheap supplies available, if one knows where to look.
Very cheap indeed are
On 16 June 2012 17:01, Peter Blodow p.blo...@dreki.de wrote:
Andy,
1 Pa = 1 N/sq. meter, a very impractical unit.
I know this stuff, I have a physics degree.
In fact many years ago the NPL invited me along to a colloquium
discussing how best to re-define the kilogram.
(Because it is currently
By the way, how come that in this mailing list everybody speaks in
inches - you were writing about the metric revolution?
That is the really goofy thing.. the end result was that we are now about half
and half, english and metric.
After the big metric push back in the late 70's, the car
On Saturday, June 16, 2012 12:31:47 PM Peter Blodow did opine:
Dave,
funny thing is that European lathes in those days you were describing,
many still working today, were equipped with inch lead screws, so that
in order to cut mm threads they have to use a 127 teeth gear in the gear
case to
On 6/16/2012 12:16 PM, gene heskett wrote:
On Saturday, June 16, 2012 12:14:55 PM Eric Keller did opine:
On Sat, Jun 16, 2012 at 9:31 AM, Davee...@dc9.tzo.com wrote:
The school was very unique in that they encouraged students to use the
machines and the facilities after hours.
Peter Blodow wrote:
By the way, how come that in this mailing list everybody speaks in
inches - you were writing about the metric revolution?
Well, in the US, the metric revolution came and went. Certain
industries (aircraft
manufacturing and auto manufacturing) have gone totally metric,
Gene
They solved the litres issue in the UK but making it illegal to sell most
things in anything but metric units. However we still measure distance in
miles, so what units should we be working out our fuel economy? Miles per
litre?
At least we can still buy beer in pints ( 20oz ones of
On 16 June 2012 18:05, Jon Elson el...@pico-systems.com wrote:
Well, in the US, the metric revolution came and went. Certain
industries (aircraft
manufacturing and auto manufacturing) have gone totally metric
Not entirely.
Part of our ECU code is being written by Ford in the USA, to plug
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
You need to get your head wrapped around square meters. (Good luck with
that!) I don't have a meter stick, but I
I remember Italy was km/hr years ago. I thought the UK was in km/hr also.
So at this point, I guess it is a safe bet that the UK will not be going
to the Euro anytime soon? ;-)
Dave
On 6/16/2012 1:08 PM, Mike Bennett wrote:
Gene
They solved the litres issue in the UK but making it
On 6/16/2012 1:45 PM, andy pugh wrote:
On 16 June 2012 18:05, Jon Elsonel...@pico-systems.com wrote:
Well, in the US, the metric revolution came and went. Certain
industries (aircraft
manufacturing and auto manufacturing) have gone totally metric
Not entirely.
Part of our ECU
On 16 June 2012 18:48, Dave e...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
No, the Hectare is metric.
An Are is an area 1km x 1km. A
2012/6/16 andy pugh bodge...@gmail.com:
On 16 June 2012 18:48, Dave e...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
No, the Hectare is
2012/6/16 John Prentice j...@castlewd.freeserve.co.uk:
Fruit machines?? What is a fruit machine?
Do you know what we call them in the US?
Dave
Slot Machine or One arm bandit I think.
The same that look like Mach3 :))
--
Viesturs
If you can't fix it, you don't own it.
On 16 June 2012 20:02, Viesturs Lācis viesturs.la...@gmail.com wrote:
1/100 is centi - centimeter is 1/100 of meter.
Hectolitre is 100 litres, so I guess hectare is 100 ares, which means
that 1 is area of 10x10 m.
You are quite right, I don't know how I got that wrong.
Except that hecto and
I know this stuff, I have a physics degree.
Sorry, didn't mean to insult you.
In fact many years ago the NPL invited me along to a colloquium
discussing how best to re-define the kilogram.
(Because it is currently based on a lump of platinum-iridium, not on
any portable physical
On 6/16/2012 2:54 PM, andy pugh wrote:
On 16 June 2012 18:48, Dave e...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
No, the Hectare is
andy pugh schrieb:
You are quite right, I don't know how I got that wrong.
Except that hecto and centi are _not_ prefixes in the SI system.
Yes they are. Hekto-, deka-, deci- and centi- (100, 10, 1/10, 1/100
rsp.) are the only ones with the decimal exponents not being multiples
of three,
On 16 June 2012 21:25, Peter Blodow p.blo...@dreki.de wrote:
Except that hecto and centi are _not_ prefixes in the SI system.
Yes they are. Hekto-, deka-, deci- and centi- (100, 10, 1/10, 1/100
rsp.) are the only ones with the decimal exponents not being multiples
of three,
Wikipedia seems
Viesturs,
don't confuse US and British units although they are both called
imperial units (since when do Americans care about emperors?) - they are
not necessarily the same as you come to details. Screws can be a lot
different, for example. I have an old English combined circular wood saw
and
On Saturday, June 16, 2012 06:44:09 PM Dave did opine:
I suspect real estate was also to be a holdout, hell, nobody around
here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as fathoms, etc.
You need to get your head wrapped around square
On Saturday, June 16, 2012 06:46:59 PM andy pugh did opine:
On 16 June 2012 18:48, Dave e...@dc9.tzo.com wrote:
I suspect real estate was also to be a holdout, hell, nobody around
here
has a clue what a hectar is, not even me.
I think that Hectars are english also, as well as
2012/6/13 Todd Zuercher to...@pgrahamdunn.com:
I was thinking of picking up some AMC servo drives off ebay (BE12A6
drives seem to be cheep and plentiful there).
Mesa 8i20 is cheaper, do not know about Pico drives.
And paired with KL34BLS-98 ($134/pcs) servo motor it should be a good
match:
On 15 June 2012 06:58, Viesturs Lācis viesturs.la...@gmail.com wrote:
Unfortunately it requires relatively larger power supply with higher
current output.
This is a problem with motors like the Keling ones, with a 48V rated voltage.
It is far simpler to make a 300V PSU than a 48V one. Simply
Elson [mailto:el...@pico-systems.com]
Sent: Thursday, June 14, 2012 10:33 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Brushless Servo Selection?
cogoman wrote:
450 Oz-in. steppers are pretty hefty devices.
I followed the link to the Keling website, and the heftiest
On Fri, 2012-06-15 at 10:53 +0100, andy pugh wrote:
On 15 June 2012 06:58, Viesturs Lācis viesturs.la...@gmail.com wrote:
Unfortunately it requires relatively larger power supply with higher
current output.
This is a problem with motors like the Keling ones, with a 48V rated voltage.
It
2012/6/15 andy pugh bodge...@gmail.com:
On 15 June 2012 06:58, Viesturs Lācis viesturs.la...@gmail.com wrote:
Unfortunately it requires relatively larger power supply with higher
current output.
This is a problem with motors like the Keling ones, with a 48V rated voltage.
It is far simpler
Am 15.06.2012 19:58, schrieb Viesturs Lācis:
2012/6/15 Kirk Wallace kwall...@wallacecompany.com:
Building an Antek supply shouldn't be too expensive, but I haven't
checked prices recently.
http://www.antekinc.com/index.php
http://www.antekinc.com/gview.php
Thanks for the links! 155$ is
On 15 June 2012 18:40, Kirk Wallace kwall...@wallacecompany.com wrote:
Another thing I haven't had time to look into is using a Delon doubler
when one needs higher voltage than what is at hand.
http://en.wikipedia.org/wiki/File:Bridge_voltage_doubler.svg
On 06/14/2012 10:33 PM, Jon Elson wrote:
Thats inch-POUNDS! 16 times inch-Ounces.
56 In-Lb is 896 Oz-In, so you have made a mistake. Also, steppers,
ESPECIALLY
Thanks. I don't have an intuitive feeling for N-m measures, so for
quite a while I have been making this mistake in my head. I had
On 15 June 2012 23:40, cogoman cogo...@optimum.net wrote:
Thanks. I don't have an intuitive feeling for N-m measures,
As a comparison, the triple stack NEMA 23 steppers are up to 3Nm.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
There are about 1.3 Nm to a ft-lb.
N. Christopher Perry
On Jun 15, 2012, at 18:40, cogoman cogo...@optimum.net wrote:
On 06/14/2012 10:33 PM, Jon Elson wrote:
Thats inch-POUNDS! 16 times inch-Ounces.
56 In-Lb is 896 Oz-In, so you have made a mistake. Also, steppers,
ESPECIALLY
Thanks. I
On 16 June 2012 00:37, N. Christopher Perry n_christopher_pe...@me.com wrote:
There are about 1.3 Nm to a ft-lb.
Which would reduce confusion no end, except motor manufacturers want
bigger numbers, so like to use oz-inch in the US.
There was a similar tendency in the metric world, but it seems
On 15.06.12 10:40, Kirk Wallace wrote:
On Fri, 2012-06-15 at 10:53 +0100, andy pugh wrote:
This is a problem with motors like the Keling ones, with a 48V rated
voltage.
It is far simpler to make a 300V PSU than a 48V one. Simply rectifying
mains voltage into a big capacitor makes a PSU
I am thinking about trying to upgrade some old routers from steppers to
servos. I am seeking advice on a good and inexpensive BLDC motor to
use.
The steppers on them now are NEMA 34 with a 3/8 shaft, rated at 7amp
and 450 oz-in. and are half stepping from an old Anaheim Automation
unipolar
On 13 June 2012 16:48, Todd Zuercher to...@pgrahamdunn.com wrote:
I was thinking of picking up some AMC servo drives off ebay (BE12A6
drives seem to be cheep and plentiful there). And run about a 400W
motor of some sort. I think I would like to use a Mesa 5i25 for
controlling it all (is
cogoman wrote:
450 Oz-in. steppers are pretty hefty devices.
I followed the link to the Keling website, and the heftiest motor
they listed was a maximum of 6.3N.m, which I assume (correct me if I'm
wrong) means Newton-Meters. The conversion calculator I used gave me 56
inch pounds,
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