25 Nov
2007
25 Nov
'07
5:30 p.m.
From: dm561 at torfree.net
To: cctalk at classiccmp.org
Date: Sun, 25 Nov 2007 06:44:14 -0500
Subject: RE: FD400 drive troubleshooting
---------------Original Message:
Date: Sat, 24 Nov 2007 10:02:54 -0800
From: dwight elvey
Subject: RE: FD400 drive troubleshooting
Hi
I guess my problem was reading your sentence. It just isn't clear
to me where you are saying they are equal and where they are not.
The part "60Hz bars = 300RPM and the 50Hz bars = 360RPM" seems
to be saying that "300RPM @ 60Hz = 360RPM @ 50Hz".
I'm sure I'm reading it wrong but it is still confusing. At least
we both agree on the basics and that is all that counts.
Dwight
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From:
dm561 at torfree.net
------------Original Messages:
>> Date: Thu, 22 Nov 2007 12:17:31 -0800 (PST)
>> From: Fred Cisin
>> Subject: Re: FD400 drive troubleshooting
>>
>>>Many/most drives have 50Hz/60Hz zebra discs on the flywheel, for using a
>>>flickering fluorescent light.
>>
>> Which just happens to be the ratio of 300RPM vs 360RPM, so that on a 300RPM
>> strobe disk w/a 60Hz light the 60Hz bars = 300RPM and the 50Hz bars = 360RPM.
>>
>> FWIW,
>
> Hi
> I think you have the ratio backward. The 60 Hz disk for 360 RPM
> can be used for the 50 Hz 300 RPM.
> Dwight
>
> ----------Reply:
> Well, unless you're just saying that a 60Hz 360RPM strobe disk (if you had one)
> would also sync at 300RPM under a 50Hz light, I don't see what's backward.
Hi
That is what I said. The disk with 20 bands would work for both
a 360 RPM and 60Hz light or a 300 RPM and 50 Hz light.
--------
Gee, I thought that was what *I* said (and you claimed was backward).
Let's see; I said that 300RPM @ 50Hz = 360RPM @ 60Hz, and you
said that's backward - 360RPM @ 60Hz = 300RPM @ 50Hz.
Sounds like the same thing to me (and Tony) except that a 360RPM
strobe disk is a lot harder to find than a 300RPM.
Sheesh...
---------