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@Joellpz who created the DWG (or determined the values)? I think that Tolerance is way too tight ... +/- .02mm ? ... yikes
Of the 2 high priced machine shops I spoke with and the shop the spacer ended up at all 3 agreed that the +/- 001 /.02mm was best for this application.
I wasn't knowledgeable enough to argue so that's the way we went.
Of the 2 high priced machine shops I spoke with and the shop the spacer ended up at all 3 agreed that the +/- 001 /.02mm was best for this application.
I wasn't knowledgeable enough to argue so that's the way we went.
WP
We're splitting hairs (literally), but should say .025mm ... You always shoot for perfection (within time constraints and pretty easy to be close in this situation), but using any Stated/Printed Tolerance of less than .001 (as in .02mm) on a part like that is just unreasonable
.
Last edited by Harley_ish; Apr 18, 2024 at 02:27 PM.
We're splitting hairs (literally), but should say .025mm ... You always shoot for perfection (within time constraints and pretty easy to be close in this situation), but using any Stated/Printed Tolerance of less than .001 (as in .02mm) on a part like that is just unreasonable
.
No it's not If you got a good machinist.
If that's your opinion that's fine just don't quote me doing it
You're missing the point ... it's really not about the making of that simple spacer on a lathe (btw, you don't even have to be a good machinist for that ) ... it's about "Dimensioning"
.
Last edited by Harley_ish; Apr 18, 2024 at 07:53 PM.
You're missing the point ... it's really not about the making of that simple spacer on a lathe (btw, you don't even have to be a good machinist for that ) ... it's about "Dimensioning"
.
If you want to be a mechanical designer like me, you need to know these two tables:
The first table tells us the tolerance grade in the particular case. Translated to inches, the measure is 0.582 ą 0.007, which is a grade 7 tolerance.
The second table shows us the manufacturing process that is capable of achieving this tolerance. While turning could achieve it, it is very difficult (the tolerance grade is at one extreme) and would not be recommended. However, in the grinding process, it is in the middle, which means it can be achieved with relative ease.
This is how I remanufactured the part: first it was turned, and then the final dimension was given with grinding.
That may be a tight tolerance if you are going to mass produce them. Parts with in that tolerance may not necessarily be significantly better than those slightly larger or smaller.
The only downside is cost.
If you only need to make a few pieces the cost shouldn't be significantly higher.
Sharing just in case anyone else runs into this: I ran into this issue with my buddy's 08 FLH. I was replacing his tires and bearings but had no idea that the pulley bearing with the extended race would be impossible to source. Thankfully I found this thread with great information and wanted to share how we were able to make it work.
I don't have a machine shop around me that would be able to make the spacer so I did some more digging and found the kit 40287-07 which allows the 08 cush drive to be adapted to an 07. For reference: https://serviceinfo.harley-davidson....59393143642497
In this kit it replaces the extended race bearing with a ST-5205-2RS x 1” which is the exact same bearing as 5205 2RS C3, just modified for a 1" axle. It also shows spacer HD 11846 which is a 1" spacer but is perfectly safe to use for a 25mm axle.
We were able to find HD 11846 on ebay for around $40 and ordered it. I was pretty confident this would work since the hub of an 07 and 08 rear wheel are virtually identical (meaning the distance from the wheel bearing to the pulley bearing would be the same distance in both applications).When we got the spacer we first did a test fit with the pulley and the bowl with the rubber isolators removed just to ensure that the pulley never touches the bowl which it did not. We put in the new isolators and there was a tiny gap between the bearings and the spacer, but small enough to know that this would be compressed to just the right size when tightened down (due to the nubs on the outside of rubber isolators).
We got everything installed and the belt lined up to the pulley perfectly and the rear end seemed solid. He's been riding ever since with zero issues.
I took a measurement of the HD 11846 spacer width and it came to approximately 13.9 mm (in case people are still needing to get them custom made).
So basically the combo of a 5205 2RS C3 bearing and HD 11846 is all you need to get the pulley where it needs to be. Hopefully this helps anyone else who runs into this issue down the road.
Last edited by jibjab90; Apr 30, 2025 at 05:37 PM.
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