This makes more sense to me
The axle is still bending between the two bearings, which are supports, as you put it, for the pedal body, not the axle. The pedal body (and shoe) however increase the section modulus in that area so the stress in the axle spindle itself will be low at that point.
As for all cantilever beams, however, the highest stress is at the fixed end of the beam (the crank end in our situation). While there is stress in the axle between the bearings, it would be significantly less than at the crank and you would need a very finely calibrated strain gauge to get consistent and accurate results.
Sensor by the crank for the winā¦
New update, looks like they are moving forwards with V2.0. Looking at the axle design they are going with the one shown the renderings (double beam) so the potential difficulties presented by Keith Wakemen came too late. I am hoping that they are getting expertise from their sensor supplier on the design.
Looks like they have learned from their mistake the first time around and are producing a prototype batch for testing.
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If you look at the pix closely, I believe the 2 bearings are side-by-side on the right-hand side of the sensor package - a needle bearing close to the center of the pedal to hold most of the load, and a ball bearing to hold the balance plus any axial load, with a spacer in between. You thus have the attachment point, the load cell, and then the bearings.
Note that this is the SRM pedal; not sure what Vectors look like.
They seem to have 2 bearings side-by-side at the end of the axle, and no way to get a bearing inboard between the load cell and the rubber seal. Iām under the impression they are doig the same thing as SRM, but with a much larger overhang (the 2 bearings much closer to each other, no spacer, and the load cell further outboard), which increases the bearing loads and the strain on the pedal body. Risky business. Not sure why they do this, they could have moved the load cell further inboard.
I donāt see what the secret sauce is here. They started with a useful but unrealizable idea (that a number of companies had already failed at), now they have a maybe me-too product.
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Seems like they may have learned. New update today with the prototype pedal spindles with strain gauge attached and unsurprisingly they found an issue with the first batch of PCBs. It sounds like an easy fix though and wonāt slow down the prototype testing. Of course this brings on a fresh round of unhappy backersā comments, some justified, some not.
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Agreed, I think they are doing the right thing, they are open and honest about what is going on. After all, if a power meter is unreliable, it is useless.
Another update in the IQ2 story. Looks like they are making progress. Pedal based PM delivered in August seems a bit optimistic but as far as I am concerned, that money is long gone and hopefully something usable will arrive in my mailbox and preferably before riding season is over.
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Iāve been following keenly and feel really badly for those who really wanted a pedal independent system. Iām hoping they do release an SPD based meter as that would be ideal for me.
I donāt think that will ever happen unless Shimano decides to do their own. The refuse to license SPD-SL to anyone where as Look seem more than happy to hence all pedal based systems are Look afaik.
Six of one, half dozen of the other for me, they are both good systems but there are many partisan people out there
Oh I meant spd not spd-sl. I generally wish there were more open standards for everyone. I hate Proprietary parts
I guess weāll see if IQ2 can pull off their MTB pedal which is SPD compatible. If they are first to market with a viable option,it may make up for the rest of the debacle
Absolutely. Those would be a huge game changer for me as I prefer MTB shoes overall.
Viable is the key word here. It remains to be demonstrated if one can build a pedal-based powermeter that survives the harsh world of MTB. Perhaps it will end up as a compromise, where it serves the less-demanding applications of SPD pedals - gravel and the like.
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āIfā and āviableā applies to both the road version and MTB version although the road version presents fewer challenges. Durability certainly will be the biggest one for MTB.
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An interesting video from Keith Wakeham.
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Interesting indeed that he almost completely backtracks on his initial assessment of what a big mistake their design was and it had to be fixed. What he finally touches on is practical i.e. price point and manufacturing vs accuracy and that the IQ2 should be decent at a fraction of the cost of Garminās and Assiomas
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His initial assessment was based upon an (incorrect) assumption of bearing placement. The one point he has on his opening board and he sort of waffles over afterwards is the need to align the pedal with the crankarm - thatās the main drawback of IQ2 as well as Look/SRM. Garmin/Assioma have made pedal installation as simple as a regular pedal - but you need the extra strain gauges for that. Herein lies the compromise: easy install equals higher cost because more gauges.
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New update day. Sounds good but I find it difficult that (anyone) can pull it all together to get product out in the next 4 weeks or so.
Okay, weāve got some good news! The first test ride on the home trainer was very successful, we consistently received accurate data (without any calibration). As we speak, more tests are being done. Weāre on the right track and happy about that.
Testing
Yesterday we received the right PCBs assembled with components (photo). Weāll be using these in 8 to 10 separate power meters so we can broadly test in various conditions. We will inform you of these test results as soon as possible.
Modifications
We have undergone a modification in the material of the battery support. The initial material caused a slight distortion in data measurement, but since we caught it in time, that issue has now been fixed.
Production Prep
We are making preparations for the final assembly line. The production tools and machines are being adapted to the new design, so we will be ready for mass production on time.
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Looks like things are moving along in the right direction. They have a complete working test unit now and results look promising. Hopefully this will come to fruition. Cycling Power Meter at a Breakthrough Price by Keesjan Klant Ā» Look At These Results! ā Kickstarter
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