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Recent content by whyeye

  1. whyeye

    Planetary gear whine under load

    I was thinking that any pins to hold the ring gear (base layer) in place would end up transmitting some of the vibrations to the housing. Anyhow, my apologies if I was asking too much/too in-depth. Certainly my intention was to better understand what we might be doing wrong. I will try various...
  2. whyeye

    Planetary gear whine under load

    Strong - Well there is about 0.6mm clearance between the ring gear and outer housing (also cylindrical) which seems sufficient to add a damping layer. I guess whether or not CLD is possible would depend on material suitability. I have read a bit more on the subject and most suggest that you need...
  3. whyeye

    Planetary gear whine under load

    Strong, This is the first time I've heard of constrained layer damping. Looks very interesting! We may not be able to implement this concept in the current product due to lack of space but will definitely keep it in mind for the future. The other two methods are in fact already a part of the...
  4. whyeye

    Planetary gear whine under load

    Regarding potential deflections in the carrier structure, it is more a case of my mind thinking "gee I HOPE that's not the case". With production tooling completed for all the components, such an overhaul would be a rather significant undertaking. That being said, self-consolation won't solve...
  5. whyeye

    Planetary gear whine under load

    OK, actual service life only needs to be about 100 hours under typical conditions. Operation is intermittent, definitely no more than 10 minutes per day. We use a fully synthetic lubricating grease. The product is fully enclosed and designed to be maintenance free for its entire service life...
  6. whyeye

    Planetary gear whine under load

    Not sure how to upload multiple files in one post - here is the gear data.http://files.engineering.com/getfile.aspx?folder=7d222691-327a-4564-9906-7b5b061db1f4&file=gear_data.pdf
  7. whyeye

    Planetary gear whine under load

    Thanks for the replies. Radial load would be insignificant in our application so the output can be considered to be pure torque. gearcutter - I guess the difference to the other thread is that this gearbox is very, very quiet when running under no load. The noise only appears once load is...
  8. whyeye

    Planetary gear whine under load

    thread406-295989 Hello all, this is my first post but I have loved reading all the technical discussions on this forum for quite a while. We have run into into a potentially show-stopper situation involving the planetary reducer in a new product. We are dealing with very low power levels by...
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