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Thread: Project Squirrel

  1. #221
    Ocracoke's Avatar
    Team Kaizen

    Silver steel is OK. If you needed a upgrade to the silver steel, I sometimes have used tool steel bolts which are harder to bend.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

  2. #222
    Okay, I'm back with more questions... good lord, I need to get my act together.

    So the first reduction chain would have a 6mm pitch to it leading between both the motor and the sprocket it's going to. This being the starting sprocket on the motor: https://www.ebay.co.uk/itm/174202985284

    Question is would it be alright for me to swap over to a different size chain pitch and different sprocket to act as the start of the second reduction?

    I'm sorry if the question's confusing, just trying to sort things out measurement wise.
    Last edited by Outlaw; 29th May 2022 at 01:23.

  3. #223
    Ocracoke's Avatar
    Team Kaizen

    Question is would it be alright for me to swap over to a different size chain pitch and different sprocket to act as the start of the second reduction?
    Technically yes, you can use a different pitch set of sprockets and chains for the second stage but what is the advantage in doing that? You end up with two sets of incompatible chains that means you have to carry spares for both in the event they break. For the power of the motor, I would honestly stick to 6mm pitch for both stages to start off with.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

  4. #224
    Okay, fair enough. Now for the 1:4 ratio, can't exactly find a 44 tooth sprocket to make the 1:4 ratio work... would a 45 tooth sprocket work? Just wanting to cover all bases here, and make sure I don't end up screwing up.

  5. #225
    Ocracoke's Avatar
    Team Kaizen

    45/11 is 4.09 so it isn't adding anything signifcant to the overall reduction, you should be OK.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

  6. #226
    Excellent. Last 2 questions for now...

    1: Should I use 11T Steel Simplex sprockets (this one):

    Or am I overthinking it and should use Platewheel Simplexes for all three parts of the mechanism? I ask because I feel like the "dm" bit on the 11T would be a bit too large for a 12mm steel shaft with key to go through and could lead to breaking said sprocket without so much of me breathing on it.

    And 2, would it help for me to use a couple of Shaft Collars to keep the shafts from sliding out on use?

    Once again I apologise for all the questions, just that I've been sitting on this project for so long, I just wanna get this right...
    Last edited by Outlaw; 29th May 2022 at 23:55. Reason: Dyslexia sucks.

  7. #227
    Ocracoke's Avatar
    Team Kaizen

    Or am I overthinking it and should use Platewheel Simplexes for all three parts of the mechanism? I ask because I feel like the "dm" bit on the 11T would be a bit too large for a 12mm steel shaft with key to go through and could lead to breaking said sprocket without so much of me breathing on it.
    I am not sure I follow. If you go down the key route, you need to account for half of the key height in the bore. I've had keys done in quite thin boss widths in relation to the bore without breaking. I'll see if I can get a photo of the key.

    And 2, would it help for me to use a couple of Shaft Collars to keep the shafts from sliding out on use?
    I've used them on the old version of Jibril and yeah, two inner shaft collars work. I do advise getting ones where they use two bolts though, single split collars don't work in my experience.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

  8. #228
    I am not sure I follow. If you go down the key route, you need to account for half of the key height in the bore. I've had keys done in quite thin boss widths in relation to the bore without breaking. I'll see if I can get a photo of the key.
    Yeah, dyslexia's a bit of a you know what. I guess what I'm trying to say is that in that image, and with what the listing says is that the boss diameter being 14mm, and the shaft being 12mm, I'm honestly not sure the thin boss width'd be a bit too thin. Or am I just worrying for no good reason?

  9. #229
    Ocracoke's Avatar
    Team Kaizen

    Yeah, that is a bit too thin. 12 + (4/2) = 14mm which would be a problem. I would get a 12T sprocket with a 12mm bore since that should have a 16mm wide boss. You'll lose a litte bit on the reduction then (45 / 12 = 3.75:1) but assuming you are still using the 11T sprocket on the scoother motor, you'd want a 24T spocket to compensate (24 / 11 = 2.18:1, so 2.18 * 3.75 = ~8.18:1).
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

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