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sailor
Registered: Jan 2002
Posts: 90 |
Release id #194046 : 1541 Speed Test
Regarding the alignment, would you elaborate your thoughts on the following: (from the docs)
Quote:F3 align the head to track 42 in a better way than other programs do.
F5 moves the head to track 1
How to correctly align a drive:
1) gently unscrew the screws of the track 1 "stop"
2) press F3
3) press F5
4) gently move the track 1 block so there is 0.25 mm (a hair or little more) between the block and the head the head.
5) screw the screws tight carefully checking the block is still at 0.25mm from the head.
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chatGPZ
Registered: Dec 2001
Posts: 11391 |
Again mixing up the terms. Fine :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting GroepazAgain mixing up the terms. Fine :)
Quoting 1541 User Guide
An alignment problem may develop gradually or suddenly. Most alignment problems
are caused by the slipping of the drive wheel on the shaft of the stepper motor which
is used to move the record/play head from track to track. Slippage occurs because the
drive wheel is only press fit on the stepper motor shaft. There is no set screw or
keyway to maintain the correct alignment. When the 1541 has been operating for
long time, it gets hot inside, the metal parts expand and the drive wheel may slip if
stress is applied. Normal accessing of files does not produce enough stress to cause
problems. However, slippage will occur if there is bump to track 1. When the drive
does bump, the stepper motor attempts to move the head outward total of 45
tracks. This is done to ensure that the head is positioned over track 1. lobe on the
stepper motor drive wheel hits mechanical stop to prevent the head from moving
past track 1. It is the hammering of this lobe against the mechanical stop that causes
the clatter each time you format diskette or when the drive is attempting to recover
from an error. If bump occurs when your drive is hot, some slippage is likely.
I called it alignment as it is called in every guide or book or even the service manual. |
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chatGPZ
Registered: Dec 2001
Posts: 11391 |
Alignment is what you adjust by moving the stepper motor position, not the track 1 stop. And the above quote doesn't say otherwise. The track 1 stop only defines which stepper position is track 1, no more no less. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting GroepazAlignment is what you adjust by moving the stepper motor position, not the track 1 stop. And the above quote doesn't say otherwise. The track 1 stop only defines which stepper position is track 1, no more no less.
Is this another of your famous brain farts?
Read again.
Adjusting the track 1 stop is a way to compensate for the "slipping of the drive wheel on the shaft of the stepper motor".
And by the way it is also possible to realign the drive using the same (opposite) method and without touch the track 1 stop.
But from all this I understood you didn't spend even 5 minutes on the service manuals.
And you seem to be able only to talk, modify other people software and then speak badly about anything.
Do something useful, come on.
I may be late a few decades with this utility, but at least I did something useful for people to use. |
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chatGPZ
Registered: Dec 2001
Posts: 11391 |
Just wow. again. |
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tlr
Registered: Sep 2003
Posts: 1791 |
Quoting ZibriQuoting GroepazAlignment is what you adjust by moving the stepper motor position, not the track 1 stop. And the above quote doesn't say otherwise. The track 1 stop only defines which stepper position is track 1, no more no less.
Is this another of your famous brain farts?
Read again.
Adjusting the track 1 stop is a way to compensate for the "slipping of the drive wheel on the shaft of the stepper motor".
And by the way it is also possible to realign the drive using the same (opposite) method and without touch the track 1 stop.
The text you quoted said nothing about the track 1 stop adjusting the alignment though. It only mentions the pressfit connection may slip when hitting the stop repeatedly in combination with heat stress.
The service manual at zimmers didn't really detail alignment (1540-1541_Disk_Drive_Service_Manual_314002-01_(1985_Nov).pdf)
I did however find this: 1541_Maintenance_Guide_1984.pdf. It's not a Commodore publication but seems fairly legit.
See "2-5. Head Alignment" and "2-6. Mechanical Alignment of Track #1 Stop".
This is how I remembered it as well. I guess I read a similar document, but the 80's was a long time ago. :) |
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iAN CooG
Registered: May 2002
Posts: 3204 |
Zibri: Now calm down, you're pissing out of the pot.
You have made ONE silly little vertical bar demo and ONE drive tool, while Groepaz has a decades long history in the C64 scene, not counting being one of the maintainers of VICE emulators, so he did, does and knows a bit more than you can think, despite his often despicable social attitude. I know myself his direct ways are unnerving at times.
You might have some other knowledge in other fields outside the C64 world, anyone can google your handle/real name to find out you are known for other HW hacking/projects, ok cool.
In here you're not exacly an "elite" coder at all, you're just showing exactly what other said about you, to be a dunning-krueger syndrome affected guy, because you act as one, at least judging how you reply. You did your research, you did your program, it's cool, works. But you can't actually tell Groepaz to "do something useful", come back in 20 years maybe after having done enough to compare your history with his. |
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chatGPZ
Registered: Dec 2001
Posts: 11391 |
BTW; the technique Zibri refers to has been known as "pinning" for about 3 decades (almost 4). It can temporarily improve the situation - but without actually fixing the problem (the slipping wheel shaft, which can be done with glue or locktight or sth similar) it will go out of alignment again after some more head bumps. It's something bedroom tinkerers do that do not know any better.
I'm also marking the day in the calender, with a link to IANs post :=) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting iAN CooG You did your research, you did your program, it's cool, works. But you can't actually tell Groepaz to "do something useful"
I was referring to RPM.. not globally.
Imagine that 90% of my work in 20 years will never be public nor known but I am sure there are more than a few devices you own that have benefit from my work.
Nevermind, probably I wasn't clear about the subject.
The subject is that groepaz until now wrote alot against my program without producing anything better or even comparable (still talking about rpm measurement).
That's all. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting GroepazI'm also marking the day in the calender, with a link to IANs post :=)
As most drama queens do. |
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