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Old March 8th, 2018, 11:44 AM   #1
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ipixu78's Avatar
Join Date: Oct 2016
Posts: 14
Default Inline Axles and tolerance to bearing.

Main question: Are current axle designs poorly manufactured/matched to frames or is there a reason for how they are?

I'm looking for answers from imaginative folk and those who make their own equipment and/or have taken measurement tools to their gear to dig deeper.

I think I 'want' a custom set of axles in my trick inlines, as I believe the tolerance of the axle and bearing/spacer interface is poor. I only tighten my axles 'finger tight.' I can torque the wheel and feel a slight wobble. This wobble creates clicking sounds as I do tight 3-turns and especially whilst doing toe wheeling tricks. I am afraid to tighten my axles further so I don't strip my frame threads. I imagine tightening the axles would have the effect of pinching the bearing spacer setup so that the frame is solidly mounted and less likely to allow the wheel wobble I am noticing.

I have taken my Mitutoyo Vernier Caliper to my axles to check their diameters.
- Steel Sebas (Igor Pro Frames) 7.90mm +/-0.01mm
- Aluminium Powerslide Axles (Alpha Frames) 7.78mm +/-0.01mm
(It seems that the SEBA Axles are made to a size closer to the 8.00mm 608 bearing. This shows there is at least 0.10mm of play between the axle and the inner bearing race ring.

Out of curiosity, I also measured the 7mm axles of my Roll-line Dance plates and found that the 627 bearings are an incredibly close match within 0.01mm!, for this reason my rink says there is less need to go to the trouble finding spacers that fit the wheel-hub design)

QUESTION: What is the reason they donít provide a better fitting axle on inlines?

I also noticed that at the threaded end of the axle there is an extended small area unsupported, that really should be to the axle diameter tollerance (i.e. close to 8mm).

Powerslide axle (on Alpha frame) approx. 2.39mm
Seba axle (on IGOR Pro Frame) approx. 4.40mm (over half the width of the 608 bearing!)

Iíd appreciate comments and anyone who has noticed this. There is a heap of info on bearing spacers, but I feel no one has really covered the question of speed-axle design and functioning.

Thanks for reading.
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Old March 8th, 2018, 12:31 PM   #2
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Join Date: Aug 2010
Location: Cedar Rapids, Iowa
Posts: 1,649

The most usual reason for small diameter is to allow a larger manufacturing tolerance range. Without going into all of the specifics, holding tight tolerances mean higher cost, larger tolerances are lower cost.

In the 'speed' section there have been a couple extended discussions about axles. (a couple years ago or more)

I have a bit of an idea as to why the end of your axles are relieved... It could be to allow clean tool runout during the thread cutting operation. Again... a long relief means easier machining which means lower cost. But, without photos it is tough to guess well.
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