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Hello, I have a No. 8 Di-Acro bender. We bend U-bolts on this machine, we want to develop a list for our operators to use that tells them what raidus pin to use depending on what inside measurement the U-bolt needs. For example, if the distance between the legs needs to be 1", should a 15/16"...

Thanks for your input everyone. I haven't considered welding a shaft collar on, I'll look into that. The goal of this machine is to roll sheet onto the outer tube, and as it can get quite heavy the shaft is rotating with several foot pounds of torque to ensure sheet keeps rolling up on to the...

You don't mention what joint tightness you need. When that's not mentioned I assume user will want 75-85% bolt yield. Balance that with the bolt load and torque derived from the thread stripping strength and go with the lower installation value. Bickford's "Design and Behavior of Bolted Joints"...

I have a shaft, 2-7/8"OD that rotates @ 60rpm and several ft.-lbs. of torque. I want to slide over that, a second metal tube. This metal tube will attach to the rotating shaft via set screw. What should the ID be of this second tube be? I was told to try and find 2-15/16"ID, but as far as...

JohnRBaker, you said in an earlier posts there have been a lot of good books written on the intersection of engineering and technology. Can you recommend a few good ones you've come across?

Ah, if this further clarifies, what I'm looking for would basically be a cylindrical roller bearing, but with the top half of it cut off. However if something like this doesn't exist, I would appreciate any guidance on solutions for dropping bars into place and having them be able to roll.

Hello, I'm not really a bearing guy, but I'm looking for what I can best describe as an open top bearing. I have a large shaft that I want to support some heavy rolls, but still be able to rotate freely. I want to be able to lift the shaft up out of the bearing (so perpendicular to the shaft's...

Stupid question, but I've looked through B16.5-2009 and can't find these tables and figures, where are they? Have they become Mandatory appendices I, II or III? Or in Nonmandatory Appendices A, B, C, D, E? There is no appendix F in this new version.

Hi, I'm trying to determine the OD of the raised face portion on a B16.5 flange (class 150 and 300). If you're reading B16.5-2009, would this be the dimension "Diameter of Hub, X" in column 4 of Table II-8 (pg. 162) of this standard? It looks an awful lot like the Diameter of Hub is the same...

Thanks so much for your replies everyone, even the stern ones. I'm just glad to hear that I'm not crazy, and it counts to hear this from other engineers, not relatives for friends who aren't industry savvy. To respond to some of you: MadMango: Yes, I did raise these concerns, they were swept...

I was a co-op for many a semester, here's a few quick tips. 1. Their first assignment should be meeting as many people in the company as possible, sitting down with them and finding out, 1. What is their job function. 2. Who they report too. Those are required, you can also have them find out...

Hi, Here's my situation in brief: I'm the sole mechanical engineer (and only engineer) at a company that sells products in piping. I was hired on two years ago to steer the company in an engineering direction. Provide technical assistance to customers, provide technical support for our...

Thanks for your answers everyone. One thing, these tubes are frequently pulled on and off the shaft, so glues are probably out of the question. It won't be delivered to customers except in rare instances. However, the shaft has no problem if duct tape is on its end. So before the material rolls...

Hi, I have a shaft that has a cardboard tube slide over it. I want the tube coupled to the shaft so they spin together. The problem is that cardboard tube is completely covered on top, so I can't just put a clamp on an exposed section and be done with it. Basically the cardboard needs to be...

Hi, I'm considering studying for and taking the Autodesk Revit Architecture 2011 certified associate certification. I'm an ME with a passion to get into the building industry and hope this can help me find a position. Few quick questions: 1. Do people actually know about this cert? 2. Would it...

Desertfox, is my fundamental understanding of how the motor operates wrong? I thought that as the motor starts out unloaded, it will go faster with lower torque, and then as it loads up to the 250lbs, it will be at that torque and rpm that the motor is rated full load for. What do you mean by...

Hello, I'm working on developing a sheet roller that starts out unloaded and ends up with 250lbs of sheet rolled around the shaft. I'm looking at getting a geared motor in the 25 - 40rpm range. The sheet can't move faster than the linear speed equivalent of 25-40rpm (its a 3" shaft) because...

Well that's good to know that I'm sort of on the right path. Only problem is there are no sparkies for miles around me.

Thanks so much, my math had come to around a 7HP motor with around 175RPM output. However do you know of any standardized resources like a machine design handbook that could walk me through those calculations like you did? Can someone recommend one? Furthermore, if I want your 5HP/160RPM motor...

I think you got exactly what I want, but how do I go about selecting a "standard" induction motor? For example, when I go to a website like Grainger, I see a list of AC motors and there's several types and each type has 20 - 30 different motors. I have a feeling the ability to know exactly what...