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  1. SKinzel

    Gear Mesh Approach Action

    Thanks for the reply. I understand those things but what I'm curious about is there a lower limit to percentage of approach action? I ass/u/me that decreasing the approach action is a case of diminishing returns. Maybe this is not correct?
  2. SKinzel

    Gear Mesh Approach Action

    I know that AGMA recommends approach action in a gear mesh to be below 50% and I understand why. What I haven't figured out or found any reference for is what would be the lower limit of approach action percentage? I've seen and even designed sets as low as 33% approach action and as far as I...
  3. SKinzel

    INTERFERENCE FIT SPLINES

    I haven't heard back but the spline is a side fit. The shafts are assembled in a gear reducer (17 shafts total) so freezing is a little difficult. When I find out how things went I'll update. Now I'm really curious as to some guidelines on how to calculate thermal growth in a coupling bore...
  4. SKinzel

    spur gear ratios

    I don't have the AGMA standards in front of me but if I remember correctly they try to keep ratios below 5:1 for parallel shaft gearing. With higher ratios you get pinions that are quite small and gears that are relatively large. This could mean that your pinion ends up with significantly...
  5. SKinzel

    INTERFERENCE FIT SPLINES

    One of our other engineers along with one of our business managers (guys who do routings and costing for the jobs) decided on the fit. When I was asked I thought, after parts were manufactured and ready to be assembled, .004 sounded pretty tight for the pitch. We currently do not have access...
  6. SKinzel

    Shaft Material

    Going with a stainless steel may be very expensive. Especially the 17-4PH. That can also be somewhat difficult to machine also. In my experience 304 stainless may be too soft, I don't know what typical hardness is but I believe it is somewhere in the "butter" range, and not be able to support...
  7. SKinzel

    INTERFERENCE FIT SPLINES

    We have some splined couplings that are designed to have an intference fit of .002-.004 on the teeth. The spline is 23T 8/16 DP 30°Pa spline. I'm trying to figure out how hot the coupling hub needs to be to assemble onto the shaft. I know how to do this for regular circular bores but I'm not...
  8. SKinzel

    Gear speed

    A couple of AGMA standards that might be useful: 917-B97 Design Manual for Parallel Shaft Fine-Pitch Gearing 2001-C95 Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth
  9. SKinzel

    Helical Gear Hob Runout

    Thanks everybody for the tips. I ended up changing the gear geometry & heat treat to give me a better overall design and the runout became less critical in the process. I don't know why I didn't make the changes earlier, but I've been through so many iterations on the gearing that I've lost...
  10. SKinzel

    Helical Gear Hob Runout

    I thought about that, but was hoping to not have to make a 3D model. I was thinking that I might just figure the runout as a spur and then use the cosine of the helix angle to approximate the distance along the centerline. It won't be 100% accurate, but it might be close enough I appreciate...
  11. SKinzel

    Helical Gear Hob Runout

    I have a integral helical pinion that has a larger bearing diameter behind it. I can't find how to calculate how much length beyond my effective tooth length the cutter will need. I would like to minimize/eliminate the hob cutting into the bearing diameter and space is a concern. Does anybody...
  12. SKinzel

    British Material Specification

    I passed on the information and told the person that we couldn't exactly match the chemistry but that we could manufacture gearing out of material that was equivalent or better for physical properties usin our standard material is 4340 Q&T to 300/340 BHN. Thanks for the help. Stuart
  13. SKinzel

    British Material Specification

    I am looking for an equivalent "American" steel for BS 970605M36T. I looked through the Metals Black Book and searched around the internet but could not find anything on this spec. I am looking into this for someone else and they tell me it is a British standard that is called out on a gear...
  14. SKinzel

    Gear Increaser Break Away Torque

    So far this the only thing that I've been able to find http://www.tech.plymouth.ac.uk/sme/desnotes/gears/gearaccel.htm According to this my customer is going to need to supply me with an acceleration requirement. The low speed gear assembly is fairly large (3500 lbs.) so the friction...
  15. SKinzel

    Gear Increaser Break Away Torque

    I guess I'm not the only one that can't find any information on making this calculation.
  16. SKinzel

    Gear Cutter terms

    I asked the leaderman of our gear department and he has never seen a hob with a "T" inside a triangle. 22dp is quite a bit finer than we normally work with, but we go through quite a few hobs. It might be an identifier mark for the hob manufacturer. As far as the d+f, Ash Gear & Supply shows...
  17. SKinzel

    Gear Increaser Break Away Torque

    Hello everybody, I'm fairly new to the forum and have a question. A customer wants me to calculate the break away torque for a redesigned increasing gear drive. We are changing the ratio so he needs to select a new electric motor and this is the first time a customer has asked me for a break...

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