The random thought thread

[blackcat4866]

Re: The random thought thread

Simple really. You don't even need to know the diameter of the earth:

If
D= diameter of the earth at any particular point
X= additional length of string
π= Pi

(D + 2")π - Dπ = X

(D + 2")π/π - Dπ/π = X/π

D + 2" - D = X/π

2" = X/π

(2")π = X = 6.2831853 inches = 0.523598775 ft = 0.000099166 miles

=^..^=

[Iowatech]

Re: The random thought thread

Glad to get off the political rants, hope everyone has a great thanksgiving (holiday).
DOS was fine (I don't know BTOS), but I did not like there GUI input.

Hope you had a happy thanksgiving too! And a happy thanksgiving to everyone else as well!
BTOS was Burroughs Operating System Twenty, a command line operating system that unlike DOS's blank screen started with a menu of available tasks. It also assigned a lot more memory to the keyboard buffer, so if you were on a slow computer and knew what you were doing you could input the data that a program required before the screens updated by quite a bit, and then go get a cup of coffee or something while the computer caught up.
Of course that was back in the early 90's when the light wheel vehicle maintenance unit I was probably in was taking care of the stuff coming back from Desert Storm. And we were using computers that were top of the line for the mid 80's for maintenance management. I guess if they were properly stowed on a standard Air Force pallet, the computers could apparently be dropped by parachute out of the back of a plane and land safely though.
I never had the guts to jump out of a perfectly good aircraft, but I admire those who do.

[nekowaiidesu]

Re: The random thought thread

Simple really. You don't even need to know the diameter of the earth:

If
D= diameter of the earth at any particular point
X= additional length of string
π= Pi

(D + 2")π - Dπ = X

(D + 2")π/π - Dπ/π = X/π

D + 2" - D = X/π

2" = X/π

(2")π = X = 6.2831853 inches = 0.523598775 ft = 0.000099166 miles

=^..^=

This looks right and I remember doing a puzzle like this in school, yet when I use numbers I get to something way different :S wtf am I doing wrong here

using mean radius of earth at 6371km
radius of string 25mm above earth at 6371.000025km

C1 = 2 * pi * 6371km
C2 = 2 * pi * 6371.000025km

C1 - C2 ~= 1.57 *10^-4 = 0.000157mm

My intuition tells me 78.5mm but my numbers tell me 0.0001mm. What's going on here?

[slimslob]

Re: The random thought thread

This looks right and I remember doing a puzzle like this in school, yet when I use numbers I get to something way different :S wtf am I doing wrong here

using mean radius of earth at 6371km
radius of string 25mm above earth at 6371.000025km

C1 = 2 * pi * 6371km
C2 = 2 * pi * 6371.000025km

C1 - C2 ~= 1.57 *10^-4 = 0.000157mm

My intuition tells me 78.5mm but my numbers tell me 0.0001mm. What's going on here?

km not mm.
I got 0.157 meters using your values.

[slimslob]

Re: The random thought thread

Black cat and white cat try to figure who it is that has joined them.

[slimslob]

Re: The random thought thread

[NeoMatrix]

Re: The random thought thread

The solution to the quandary :
(D-d) x pi = 6.28(units)

How does the ball and the string quandary translate for a Tech (Junior Techs)?
If you invert the quandary we have a Big "D.iameter" going down to small "d.iameter".

Big deal you might say, who gives a sh!t...!

Translating the diameters to that of rollers or cylinders:
A rubber feed roller(s) have warn down 1mm in radius from "D.iameter" down to "d.iameter". That translates to a lost of 6 units(mm) of paper feed in.

A rego-roller(s) have worn 0.5mm radius in the middle of the roller.
The problem equates to 3mm of registration feed lost. (a PM task)

An ITB , fuser idler roller, or belt tensioner roller has lost(squashed) 1mm in radius. There is 6mm/2 belt slipping or falling loose belt. (Problem: Torn belts.)

In keeping with the cylinder ratio :
An unwanted periodic pattern appears on a print out, what is the length of the periodic pattern in relation to the cylinder that caused the problem ? How can we quickly find out if the unwanted pattern is coming from a drum, dev,rego roller etc..?

Given: We know the unwanted pattern on the print out is periodic.
Using the print out, we make a quick mark using a pen at the offending period marks on the print out. We can then roll the print out paper into a cylinder until the pen marks align. The alignment will leave the diameter of the offending roller or cylinder. Alternatively we could measure the distance between the pen marks and div by ratio Pi to arrive at the offending diameter.

Senior Techs know the above as pedantry, Junior Techs struggle with the basics.

Junior Techs have the opportunity grasp the concept of D.iameter worn d.iameter, or (D-d)pi, and how that translates to copier/printer problems.

When all the quandary b/s is removed you have (D-d)pi.


"Life was meant to be easy, --People make it hard".

[blackcat4866]

Re: The random thought thread

Black cat and white cat try to figure who it is that has joined them.

"What do you think you're doing?" =^..^=

[nottoosharp]

Re: The random thought thread

The solution to the quandary :
(D-d) x pi = 6.28(units)

How does the ball and the string quandary translate for a Tech (Junior Techs)?
If you invert the quandary we have a Big "D.iameter" going down to small "d.iameter".

Big deal you might say, who gives a sh!t...!

Translating the diameters to that of rollers or cylinders:
A rubber feed roller(s) have warn down 1mm in radius from "D.iameter" down to "d.iameter". That translates to a lost of 6 units(mm) of paper feed in.

A rego-roller(s) have worn 0.5mm radius in the middle of the roller.
The problem equates to 3mm of registration feed lost. (a PM task)

An ITB , fuser idler roller, or belt tensioner roller has lost(squashed) 1mm in radius. There is 6mm/2 belt slipping or falling loose belt. (Problem: Torn belts.)

In keeping with the cylinder ratio :
An unwanted periodic pattern appears on a print out, what is the length of the periodic pattern in relation to the cylinder that caused the problem ? How can we quickly find out if the unwanted pattern is coming from a drum, dev,rego roller etc..?

Given: We know the unwanted pattern on the print out is periodic.
Using the print out, we make a quick mark using a pen at the offending period marks on the print out. We can then roll the print out paper into a cylinder until the pen marks align. The alignment will leave the diameter of the offending roller or cylinder. Alternatively we could measure the distance between the pen marks and div by ratio Pi to arrive at the offending diameter.

Senior Techs know the above as pedantry, Junior Techs struggle with the basics.

Junior Techs have the opportunity grasp the concept of D.iameter worn d.iameter, or (D-d)pi, and how that translates to copier/printer problems.

When all the quandary b/s is removed you have (D-d)pi.


"Life was meant to be easy, --People make it hard".

This hadn't really occurred to me. Thanks


Sent from my iPhone using Tapatalk

[slimslob]

Re: The random thought thread

The teacher gave her fifth grade class an assignment: Get their parents to tell them a story with a moral at the end of it.

---The next day, the kids came back and, one by one, began to tell their stories.

There were all the regular types of stuff: Spilled milk and pennies saved. But then the teacher realized, that only Janie was left.

"Janie, do you have a story to share?"

"Yes ma'am. My daddy told me a story about my Mommy. She was a Marine pilot in Desert Storm, and her plane got hit. She had to bail out over enemy territory, and all she had was a flask of whiskey, a pistol, and a survival knife.

She drank the whiskey on the way down so the bottle wouldn't break, and then she parachuted right into the middle of 20 Iraqi troops........

She shot 15 of them with the pistol, until she ran out of bullets, killed four more with the knife, till the blade broke, and then she killed the last Iraqi with her bare hands."

''Good Heavens, 'said the horrified teacher. What did your Daddy tell you was the moral to this horrible story'?"

...."Don't Screw with Mommy when she's been drinking."

[blackcat4866]

Re: The random thought thread

... In keeping with the cylinder ratio :
An unwanted periodic pattern appears on a print out, what is the length of the periodic pattern in relation to the cylinder that caused the problem ? How can we quickly find out if the unwanted pattern is coming from a drum, dev,rego roller etc..?

Given: We know the unwanted pattern on the print out is periodic.
Using the print out, we make a quick mark using a pen at the offending period marks on the print out. We can then roll the print out paper into a cylinder until the pen marks align. The alignment will leave the diameter of the offending roller or cylinder. Alternatively we could measure the distance between the pen marks and div by ratio Pi to arrive at the offending diameter ...

Do you see that 6"/150mm scale in my shirt pocket? That's what it's for.

Developing related problems are a little more tricksy. Since the developing roller rotates at a different rate and in the opposite direction as the drum, you don't get a direct correlation between interval and roller diameter. If the manual has a repetitive defect chart that's nice, or maybe you just made a note to that effect in your database for the next time.

You mean this isn't just common knowledge? I think Archimedes made the first fairly accurate measure of Pi in 250 BCE. Most of us have been calculating circumferences since elementary school. Depending on your age, that might be quite a while ... or fairly recently. =^..^=

[NeoMatrix]

Re: The random thought thread

"What do you think you're doing?" =^..^=

It's surprising how peaceful they are with each other.

[nottoosharp]

Re: The random thought thread

Do you see that 6"/150mm scale in my shirt pocket? That's what it's for.

Developing related problems are a little more tricksy. Since the developing roller rotates at a different rate and in the opposite direction as the drum, you don't get a direct correlation between interval and roller diameter. If the manual has a repetitive defect chart that's nice, or maybe you just made a note to that effect in your database for the next time.

You mean this isn't just common knowledge? I think Archimedes made the first fairly accurate measure of Pi in 250 BCE. Most of us have been calculating circumferences since elementary school. Depending on your age, that might be quite a while ... or fairly recently. =^..^=

I hadn't really thought about roller compression being as much if an issue as that previous to this post. In general I have to replace rollers for damage, or them just not picking up paper due to loss of tread before they cause timing issues. However I've had a 283 giving me fits, and you can bet I'll be checking it out Monday armed with new knowledge. Thanks.


Sent from my iPhone using Tapatalk

[allan]

Re: The random thought thread

I just roll up the paper until i get a cylinder where the marks line up.

[ZOOTECH]

Re: The random thought thread

I just roll up the paper until i get a cylinder where the marks line up.

I think this is what Neo and BC posted earlier.