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Hi all, The attached pictures was given to us by my employer, I asked them if it's ok to share and they were ok with it since they are not the original producer of the information. I had a little bit of debate about this with my co-workers, a few said in this particular example it doesn't not...

rb1957, I also found the term "shoulder height" weird. Since this is a translation from Russian, I thought the author probably meant "Reduction of High Shoulder", but perhaps the translator made an error and translated it as "Reduction of Shoulder Height"? just a guess. As far as why change to...

Thank you all, seems like everyone is agreeing that the shaft is locked and is not rotating relative to housing. I think it threw me off because usually it's the shaft that's rotating and supported by a bearing (and rotates together with the gear, keyed), whereas here the gear is mounted...

Hey everyone, if you look at the image, you'll see two similar designs, the main idea behind these two was how the shaft in the right hand design is cheaper to make since compared to the gear shaft in the left picture a large shoulder was eliminated and replaced by just a washer/spacer which...

Hi everyone, We use a lot of aluminum in our projects. Our general practice is to use steel flat washers under the head (we mostly use socket head cap screws) to avoid leaving indentation marks, or damage the surface during tightening and that seems to be working well. However, we don't use...

JJ, I got what you are saying and you are absolutely correct, sorry about the picture quality, it was taken from google-books, not an actual electronics copy. I did not notice the spacer between the two bearings due to the quality of the picture. (You actually did mention that in your first...

Thanks JJ for your reply. I think my thinking comes from the fact that I always assumed in order to properly transfer the axial load from the shaft you need to have a solid shoulder (or spacer or ring etc.) directly push against the ring of a deep groove bearing, but in this case, we don't have...

Hi Everyone, The first picture (taken from a book titled "Power Mechanisms of Rotational and Cyclic Motions") shows a deep groove & cylindrical roller bearing combination acting is locating-side of a bearing system. The roller bearing supports only radial load and the deep groove ball bearing...

Hi Tmoose, thanks for the link, the practical examples in that guide are pretty helpful. As TugboatEng said, I'm using deep groove bearing in this application and overall simple arrangements. I read about bearing settings/arrangements that I wasn't very well versed in, the past few days and now...

@TugboatEng Great post! Yes, it's a chain conveyor, but I did not realize the issue with the retaining rings, thanks for pointing that out. If I get rid of the locating rings and mirror the shoulder on bearing housings (so the bearing will be located on one side by the spacer/collar and the...

Hi Brian. My information is wrong then, sorry I looked it and you are right, the play will be much more than that. they are deep groove ball bearings.

Hi eng-tips, As you see in the pictures, I have a design (basically, a cross-section of the drive end of a simple conveyor). When my boss reviewed it, he recommended using a bearing lock nut on the right-hand side (so right after coupler, pressed against the inner ring of bearing). He said that...

Thanks Desertfox, Yes, that's what I wanted to know, thanks for the link and taking the time doing the calculations + the fact that in Juvinall machine component design book, under Increasing Bolted-Joint Fatigue Strength, Chapter10, there are some general recommendation, one of them is "Modify...

mfgenggear, I think You are absolutely right, if you have a series of larger bolts, joint should be much stronger anyways even though they are resisting larger portion of the external loads. Desert, I didn't think about that, that's true, the clamped members are generally much larger in area...

Thanks Desertfox, what you said about better spread of loads makes sense. I don't want to make this more complicated that it should be! but I guess one reason I asked this, is that if you use a larger bolt (and keep the clamped members the exactly the same), that means in a sense you increased...

Hi everyone, Hope it's not a stupid question![neutral] Let's say you have bolted connection and the bolts are preloaded to the recommended value (let's say to 75% of proof load) and the joint is working properly under the external loads applied to joint. Now let's swap the bolt with much...

Thanks everyone for their helpful comments (and Drawoh for the link to Osborn's dfm guideline), I have a much better understanding now.

Thanks Chez311, that makes sense. Normally I'm not too worried about it, since I'm in custom design and each part is usually a one-offs, or limited qty's, so probably cost difference won't be as much if they go with 3" vs 3-1/2" stock; but now I'm in a situation that I have to make about 120...

@drawoh, I understand that, maybe I should have mentioned this, I heard this a lot that stock material comes in over-sized by default, so I was thinking maybe it's better just to specify 3.00" and they can achieve the finished size and tolerance even using a 3" (since it's oversized), but...

Thanks @TheTick, (in my example, stock edges/faces are not permissible) so does that me if you were the designer of the part in my question, you would specify 2.90" for width just so the machinist can use 3" stock?