Results 1 to 5 of 5

Thread: couplers

  1. #1
    Join Date
    Mar 2014
    Location
    IA
    Posts
    165

    Default couplers

    Working on my hobby gear. I was having to get couplers from wobbling. When you get a new motor that has shaft flattened the whole way, that presents a problem. Unless you have a real tight fit, your ok. Now I find that most have .12/- or + leeway which don't cut the mustard! I got a tap and die 3mm set and screws to match and drill 4 or 5 mm from the original screw. This way the coupler will not wobble but you have to check it out. The second screw will help take care of the .12 leeway on flat spot. Correct me if you think i'm wrong, ok! I found that having a round shaft with 1 screw can be had by just notching a big enough slot for the set screw is enough. This way the coupler will be spot on and not wobble, keep fingers crossed! Forgot, I did have to use a pop can and cut real small pieces and lay them flat on motor shaft but that takes some doing and came real close. Got ideas, express them, all ears! I got my coupler from Steve and it is spot on and is a class act, thank you Steve.
    Last edited by Norwest; 03-05-2020 at 07:32 PM.

  2. #2
    Join Date
    Nov 2008
    Location
    Ql
    Posts
    3,169

    Default

    Which couplers are you using? and what kind of shaft? Flex or solid. Can you post a photo or a link?

  3. #3
    Join Date
    Mar 2014
    Location
    IA
    Posts
    165

    Default

    Solid couplers. Shaft is 1/8". Now once the coupler is smooth and shaft in place, noise level drop a bunch. Shaft going into coupler goes in without touching anything . This is on a Thailand longtail. I haven't tested as ice is still on the pond. Motors are outrunners. Now one has a 2836-2700 kv another has a 2212/6-2200 turnigy with round shafts but I flattened and I think that might be the problem. That is why I posted. The more I think about it , I will only notch where set screw touches the rod. BTW, thanks for response! Have good day!

  4. #4
    Join Date
    Nov 2008
    Location
    Ql
    Posts
    3,169

    Default

    If , as you say, the shaft goes into the coupler without touching anything, you must have the wrong size coupler or poorly manufactured ones.
    The shaft should be a neat push fit into the coupler with no wobble or looseness. Even with a flat area on one side.
    Perhaps you have one item metric & the other imperial. They are usually a loose combination.

  5. #5
    Join Date
    Feb 2008
    Location
    GB
    Posts
    2,726

    Default

    That was my guess too, 3mm motor shaft and 1/8" (3.175mm) coupling.
    3mm is a fairly common small motor size and there are couplers available.
    Paul Upton-Taylor, Greased Weasel Racing.

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •