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I've been researching this but sometimes you just need an expert to give a straight answer. I'm at a small aerospace design shop where I dont have access to gear mfg, so its difficult to understand some of these inspection methods without the firsthand experience. If our gear drawings define...

I saw one of your other posts on a similar topic and was going to reach out to you individually. This is great info and really appreciate your time to provide these standards. thank you! Same goes to everyone else too. Thank you!

My apologies. I can see where that might be confusing. We work exclusively with steel bearings so I forgot to consider the other possibilities. 52100 bearing material, 1" OD, 0.28" width. The entire bearing is seated in a housing that is aluminum. What 3DDave and LiftDivergence said resonate...

Thanks for the feedback. To provide some more clarity, its a geared actuator with mostly radial ball bearings. Its these radial bearings that are in aluminum housings that I'm asking about. Just wondering if other have had the same situation, what drove them to the decision they made about...

I'm working on a flight controls actuator and since I'm fairly new to the arena I'm not familiar with best practices. Theres been questions raised that a few of our highly loaded bearings (towards the flight surface output) should have steel sleeves around them because they are in aluminum...

Was hoping to get feedback on pros/cons between different gear design software such as KISSsoft, Romax, MITcalc, PowerGear, etc. We currently use KISSsoft but its clunky and seems like a beta version of software, training isnt readily available, and seems to default to ISO/DIN standards when we...

Thanks for the feedback. 15-5 chosen because its what my company traditionally used for our gearboxes for relatively high strength, core ductility, and anti-corrosion. Driver inputs are for max operating condition are ft-lb = 9.2 at 2686 RPM. Gear ratio is 2.048:1. For this specific...

I havent been a gear designer for a long time, but I'm following AGMA 2001 and my values are verified by KISSsoft. So because I havent been designing gears for long, I'm not sure how to deal with this situation: Gear pair is 48 pitch with driver spinning at 1686 RPM worst case for only 4.44...

Thanks for that feedback. I figured a lot more goes into it than I initially expected. That said, my updated approach is to establish min assembly torque limit from operating torque load through the housing plus 25% for preload sensitivity due to thread inconsistencies. Then for my max limit...

I just read another post which highlighted an important design criteria. I should be torqueing to a preload based on my expected operational load through the housing, not based on 80% of Sy. This makes a lot more sense to me. That said, the load going through the housing is pretty low, so my...

I'm working on what torque value to call out on our prints but these are not bolts/screws, but thin-walled cylindrical housings. Therefore, I'm not sure the same clamping torque calculation applies. For example, one housing is 15-5PH stainless at 3.875" diameter and the bolt clamping formula...

Thanks again. All great info. We typically fill bearings 10-15% of grease. Anything more would cause too much heat. But that SKF formula will be looked into and documented. As part of the next gen of engineers here, I'm really trying to move away from tribal knowledge where possible. We're...

Thanks for the replies. The use of technical forums is so very underrated (as long as you adhere to 'trust, but verify'). Grease is the operating lubricant. My firm designs actuators for aerospace/defense. Grease has always been our go-to such as Braycote 601 or Aeroshell 7 or 33, because our...

Hi, Wondering if anyone can point me to a standard that covers the application of grease on gears. I've looked at AGMA 9005, AGMA 911, MIL-PRF 23827, but they all speak more to composition than installation. I'm looking for best practices for grease coating on gears. Any ideas? Thank you.

Thanks Ed. Our quality dept fully agrees with you. So shall it be done!

Thanks @mrfailure. I control what goes on the drawing. So the question remains, should I include AMS-H-6875 (or 2761) or is 5659 enough since it lists the H condition? Half of me wants to leave it off because 5659 with the H condition implies heat treatment to 6875 (or 2761). Other half of me...

Thanks for all the info. I was reading AMS 2759/3 yesterday and its pretty similar to AMS H6875. When should you callout one versus the other? And to put this thread to bed so I can get my drawings out to procurement this week... Do you guys see any issue with leaving AMS H6875 (or AMS 2761)...

I'm at a small company where turn over has been high the past year+ so nailing down the history of why things the way they are isnt always easy. We work in aerospace/defense. Part is a gearmotor. The concern around including AMS 6875 is that it might constrain our vendors to that specific heat...

Hi. Havent posted on here since college... I'm working with a lot of stainless steels and our material callout on drawings include "... HEAT TREAT PER AMS-H-6875..." in addition to calling out the H condition using the AMS standard for that specific material such as AMS 5659 for 15-5PH. For...

Okay, solved my problem. I used "Unfreeze" and selected the bodies. Got rid of all boundary lines :) However, if there is a more preffered method, I'd love to hear about it. Thanks. Luke Luke Steinbach UW-Milwaukee Undergrad Student Rockwell Automation R&D Intern Mechanical Engineering