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  1. 1

    Help understanding machining tolerance

    I have an electric motor on my mountain bike. The cycloidal gear reduction was damaged and I needed to mate a new reduction unit(planetary) to the said motor. Which means I need to create a brand new housing for the motor onto which the new planetary reduction can mate. That's what this piece is.
  2. 1

    Help understanding machining tolerance

    Great reply, thanks for the insights! Now to my fundamental misunderstanding. How should I be interpreting a quoted tolerance of +/-X.XXmm when it is quoted? Is that the tolerance between to points 10mm apart 100mm apart? And how does that change with a whole number of features on a certain...
  3. 1

    Help understanding machining tolerance

    Thanks for the link! But what I it still dont understand is if the machining tolerance is for example 0.02mm Then will my part have a possible "growth" or "shrinkage" of 0.02mm/mm or 2% across a critical dimension? 2% difference across the bolt hole mounting locations will put me out almost...
  4. 1

    Help understanding machining tolerance

    In my case this piece will only be bolting up to mate with a different component. Nothing like you describe for a shaft/bore scenario.
  5. 1

    Help understanding machining tolerance

    To start, I'm a hobbiest amateur. I have a component that I have modeled. I'm looking to have this sent off and machined but I'm not sure I understand machining tolerances etc. There are a few things like the 4 peripheral mount holes, central mount holes, center bore that need to be...
  6. 1

    Edmonton- Small lathe/milling work; Advice, insight, recommendation?

    @John Conroy Big thanks John for your efforts! Also, thanks to the group and those that had a look in on the thread! Was a pleasure meeting you and getting a glimpse of your shop. Turned out nicely! Tip: Being a very strong magnet I was initially a bit worried about how I would clean the...
  7. 1

    Edmonton- Small lathe/milling work; Advice, insight, recommendation?

    John, I would be grateful, PM sent.
  8. 1

    Edmonton- Small lathe/milling work; Advice, insight, recommendation?

    The old unit had a freewheel mechanism on the output shaft, the new one has a sprague clutch.
  9. 1

    Edmonton- Small lathe/milling work; Advice, insight, recommendation?

    @John Conroy The motor is https://www.astroflight.com/3220-astro-brushless-motor-details.html In my application the motor can see about 10,500rpm motor speed. Input into the planetary gear set, gets the output shaft of the planetary reduced to 1/6th which then feeds into a chain drive that...
  10. 1

    Edmonton- Small lathe/milling work; Advice, insight, recommendation?

    UPDATE: Desired re-machined shaft OD=8.95mm (when I measure an internal casting I made of the spur gear bore with my calipers) Thanks for rotating the image. I'm not looking to disassemble any of the unit. The existing shaft is integral to the larger element. I don't even think it can be...
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