Mounting HP7970e 9-Trk 1/2" Tape Drive

Chuck Guzis cclist at
Wed Feb 6 18:19:55 CST 2019

On 2/6/19 2:29 PM, Brent Hilpert via cctalk wrote:

> (I take it you mean "now look at the -left- side".)

Well, you know, my *other* right... :)

> However, looking at my 7970A, it appears you could separate the cast-Al transport frame from the chassis box
> by unscrewing the 4 exterior left-side hinge screws, as well as detaching all the cabling between them involving
> a wire harness and a dozen-or-so plugs.

Swing the drive assembly out from the back cover--you'll note that the
pivot points on the two hinges are about 1" away from the cover flange.
 You've got plenty of room to drill your mounting holes from the *rear*
of that flange.  You might even have enough clearance for a
countersink--but that may not be necessary--the frame casting only
extends in from the left about a half-inch--you may even clear some
oval-headed screws or get away with some truss-head screws.
Alternatively, could mill a slight relief in the casting to clear the heads.

I think it's doable without removing the drive from the cover.

> For loading concerns raised by Jay, in both cases (designed-for steel
> bracket vs drilled flange) the weight of the drive ends up being 
> borne by 4 rack-screws on the left and 3 on the right. The difference
> would be steel vs Al bearing down on the 4 screws on the left, and
> some altered bending moments on the left side of the Al chassis box
> around the flange, offhand I wouldn't think it would matter.

I tend to agree--the force is mostly downward on the front of the drive.
 I suppose that you could reinforce the aluminum housing with some steel
bar backing up the mounting flanges, but that seems like overkill to me.


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