The 24v / 28v alternator showed up:
10.3 lbs. Ooof.
Of course the documentation from fleBay is minimal. Stuffing 12026N into the search bar yeilds this NAPA listing:
Fingers crossed.
It has a D+ terminal. So it looks like I need an idiot light connected from the key (or armed or whatever) 24v to this terminal to get the initial excitation.
This 1090D1-28V from Mouser looks like a likely candidate:
Contains a “2187” bulb which looks like 40mA, 7000 hours:
nice.
My mower dropped the 1m cutting blade the other day. Bolt got loose, temps rose, dropped off at 2000rpm. Not much damage, but could have been. Treat these machines as wanting to kill you, and you stand a chance ! Yes - lots of locktite was used, and now to fix some worn keyways …
Side project: Using photogrammetry to create 3-d models of the external components:
I do not have a subscription with https://poly.cam so I can only share the link and a screenshot:
I’m trying to crunch it through using MeshRoom on my home PC. I should eventually be able to get that into Fusion.
Quick note: I am not impressed with any of my free toolchain solutions. I can get them into Fusion but they look like poo.
I put in an offer for $551 on this eBay item and it was immediately accepted ($549 was immediately rejected). There are 2 left:
Been going a little slow - - life getting in the way of living.
I was able to design and 3d print an adapter to go directly from the Permobil Corpus F3 wheelchair motor’s hub to some high offset marketplace wheels.
The wheels are for 20x8-8 tires. They have a very deep offset which makes the adapter much simpler. I have some new Reaper ZTR tires on the way.
I’ll try to use my cheesey desktop mill to machine the adapters. It will take 5 setups, which will be a challenge.
I wonder how the bearings in the motor will hold up long term with that much ‘lever’
That is a significant moment with that adapter and wheel offset. I would say you would not want to exceed what’s it rated for by a great deal. From a quick Google search of the chair those go in:
Max user weight: 330 lbs. So 165lbs per side. Well, less as the rear wheels support load but assume worst case.
Take a guess at the moment with the stock wheel which is pretty narrow: ~2" from the wheel mounting flange?
So 330 in-lbs
What is the moment length to the center of that wheel to the same point and then apply your expected load.
@myozone, @dkemxr, thank you for your replies.
The lever moment is a concern.
Google thinks:
" The Permobil F3 Corpus has an average shipping weight of around 380 to 405 lbs"
Plus the user at 330 so we are at ~ 700 lbs overall or ~350 per side.
That I why I went from my original Jazzy Select motor which is designed for a slightly lighter chair and smaller wheel (10-inch) compared to the Corpus F3 motor which comes with a larger wheel (14"diameter):
Here is my initial weight estimation:
Eeek ! Hopefully I can come in at under that estimate.
So assuming perfect balance of 225lbs/wheel and worst case of 10" lever to the outside of the tire we have
2250 in/lbs = 188 ft/lbs
And that is static load. Dynamic load and vibration will push that higher.
Assuming the F3 is has a worst case 5" lever at 350 lbs:
1750 in/lbs = 146 ft/lbs
So we are less than a factor of 10 off. That is encouraging !
I considered using a sprocket and chain to the original axle of the donor mower, and that is still a possibility. I just hate the idea of an open chain getting loaded up with grass and dirt.
On the other hand, the forged steel hub on the F3 is attached to a 3/4" axle which is the same size axle as both the donor mower and my larger and heavier Cub Cadet GT1554. The donor mower is ~360 lbs + ~250 lbs driver = 610 lbs.
So I think there is a chance it will hold up, and I also accept that there is a possibility that it will fail. If so then it is an opportunity for more Quality Shop Time™.
Distraction: in this video, the fellow completely disassembles one of the motors and partially disassembles the gearbox from a Permobil Wheelchair:
Sorry for the lack of updates. Lots of life stuff happening that is pushing the mower project down the priority list.
I got the blade centering adapter back from ProtoLabs. I used the absolutely cheapest service so it took some time. They look fantastic:
I could not ask for a better fit:
Super happy with that small win.
I’m still learning the Einstar scanner. I can see the potential, but I’m not yet getting usable scans that I’m happy with.
I carved out some time to make a video of machining the wheel adapter out of aluminum:
Peace.
