Dear Peter,
Thanks for the mounting info. I have decided to go with the standard 3
1/2 inch internal zip drive. thanks to a member of this List who
happened to have one around. My friend had already "tried" to install
a 250 Zip and found it just wouldn't fit the
platform because of the sled size.
Ginny
On Feb 19, 2006, at 9:33 AM, PeterH5322 wrote:
Zip drives are 3 1/2" devices and fit that form factor, so any IDE
zip drive should fit in that slot.
Not true.
Zip drives are 1" high, that much is true, but the mounting pattern and
fastener size differs significantly from the 3-1/2" industry standard.
Hence, different sleds are required.
Beige G3 MTs accommodate the differences by providing mounting holes
for
3-1/2" floppy and Zip drives, 3-1/2" hard drives, and 5-1/4" hard and
optical drives, all on the single sled. Other models provide different
sleds for the different drive types.
Industry standard 3-1/2 drive:
Depth: 5-3/4" (146.05mm)
Offset from front to first set of screws: 2-3/8" (60.33mm)
Offset from front to second set of screws: 4-1/8" (104.78mm)
Distance between screws: 1-3/4" (44.45mm)
Width of screws: 3-3/4" (95.25mm)
Screw size: 6-32 UNC
Units: Imperial
Zip drive:
Depth: 6-7/16" (163.51mm)
Offset from front to first set of screws: 35mm (1.3780")
Offset from front to second set of screws: 105mm (4.1339")
Distance between screws: 70mm (2.76559")
Width of screws: 3-11/16" (93.66mm)
Screw size: M3-0.5
Units: mixed metric and Imperial
And, if the above wasn't enough, Mac PCI card mounting is nonstandard.
Standard PCI mounting: 6-32 UNC
Mac PCI mounting: M3.5-0.6
The diameter of an M3.5 fastener is so similar to a #6 fastener that
many
are tempted to use a UNC screw in place of a metric screw.
A damaged case is usually the result as UNC screws are usually hardened
(or are work hardened during the "thread rolling" process), and are
harder than the mild steel case parts.
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