From: "Robert Jarratt"<robert.jarratt at ntlworld.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Keeping a Heavy Machine on a Domestic Suspended Floor (UK) Message-ID:<068e01cf07f6$bde4ee40$39aecac0$@ntlworld.com> Content-Type: text/plain; charset="us-ascii" I recently bought a lovely PDP11/45 in a H960 rack, with the CPU, a Unibus Expansion box and an RK05 drive. I am guessing the whole thing must weigh at least 100Kg, possibly 150Kg or even more (my worst case estimate is 200Kg). I am concerned whether the floor of the upstairs room where I now have it can bear the weight. I have placed it right next to a load bearing wall to ease the strain on the joists. Can anyone tell me what sort of weight a normal UK upstairs floor can bear? If my guessed weight is anything close to the limit I will weigh parts of the machine to get a more accurate idea of the actual weight. Really, compare it to a piano! Even an upright piano weighs more than 200 Kg. I seriously doubt you have any danger. You can probably get the true weight from installation docs on bitsavers. It is possible it weighs more than 200 Kg, but still less than some really heavy furniture or a grand piano. Jon