Very, very important point. If you use normal rack rails that offer full extension - you have a very heavy item hanging out from the desk. Most likely, it will tip the desk over unless you design for that. Pro Display XDR comes crashing to the floor, or maybe on your head.in bad cases: stability of the whole rack
If you go for a 19" racks small enough to fit under a table that has wheels, then why not go for a MP7,1 with wheels ... It's got it all in one go.
FWIW: I do have a 19" rack at home in the basement, holds our servers. But our MP7,1s are wheeled and under our desks.
one in the front and one in the back. Just make sure you can attach them to the desk VERY securely.
I'd just get a MP with wheels.
If you really need a rack: read up on the apple specs on how to mount the MP in it. Ny far not all 19" racks can hold all equipement. The depth of the rails from the doors (if any), the number of posts, the type of holes, etc.: it all matters.
First, if look at that page there are some other 'options" there for "heavy" for the smaller U sizes. There isn't a "6U heavy" here. Perhaps 6U is only their variant of "heavy" but this is a bit dubious for the weight of this object.
When the Mac Pro is fully telescoped onto the extended rail what is going to happen to your desk you have bolted these brackets to??? It called Torque and moment of inertia.
You don't bolt the "faceplate" of the system to the rack. The rails go on the rack and then the Mac Pro goes on the rails. The top and bottom of that "two piece" set up not being attached isn't the stable system being targeted with Apple's standard mounting solution. You can probably cobble a 'Plate'/'flat Drawer' for the Mac Pro to sit on. It is so heavy it should move much once get it into place.
The underside of any vintage design oak desk is probably going to be a physical mismatch for this. It doesn't matter how 'sold' the top slab of oak is.
I'm not sure what you mean here. I didn't say anything about bolting the faceplate of the Mac Pro to the rack. I think I didn't describe what I was thinking of all that well, though. My idea was to get two of the 6U units, and screwing them to the underside of the desk so they are hanging down. One in the front, and the second one in the back. The rails would be installed between the two units, and the Mac Pro mounted into the rails. You would then be able to extend the rails to slide the Mac forward.
I really don't see why that should be the case. A 6' x 3' oak desk can easily weigh 120 pounds. Even with the rails fully extended, the center of gravity of the entire setup should still be well over the base of the desk.
Do you define "reasonably heavy" as 'won't tip over when the chassis is slid out'? And "not heavy enough" when the desk tips over when the MP7,1 is slid out?I'm pretty confident that a reasonably heavy desk would be in absolutely no danger of tipping over with such a setup.
[automerge]1580525222[/automerge]It's a shame you don't have the resources to post a photograph of your desk.
If only someone were to invent a device to take a picture that could be shared...
Perhaps such a device would be too expensive for a Mac Pro owner to have.
Do you define "reasonably heavy" as 'won't tip over when the chassis is slid out'? And "not heavy enough" when the desk tips over when the MP7,1 is slid out?
Don't underestimate torque.
That might be harder than it would seem for TB3 cables.