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Thread: Wheel chair lift
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29th Apr 2021, 09:28 PM #46
Hi John,
I was beginning to wonder how you were getting on with this project ! Have you had a chance to drive in the new chair yet ?
PS: That bolt you have left in there wont do the gears any good at all.
Nice work by the way.Best Regards:
Baron J.
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30th Apr 2021, 05:09 PM #47Most Valued Member
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G'day John, yes I have been hooning around all over the place, i have done 86 kilometers in 4 weeks.
Its not a bad jigga but does need a bit of refinement in some ways, it has nearly chucked me out a few times.
The problem is mostly traversing a gradient (driving sideways around a hill) if there is a bit of a hole hidden in the grass and you are already on a steep angle and the front wheel drops into it things get exciting so i will have a go at that first, after the lifter.
I have collected some parts, pictured below, who can guess what my devious plan is?
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30th Apr 2021, 05:35 PM #48I break stuff...
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Given the context of the post, some form of levelling/tilting mechanism for the upper part, to be able to shift the centre of gravity up the hill further?
A random thought that occurs to me looking at it - given it's got decent size inflatable tyres, you could potentially load them with ballast to say a 60% fill. Did that to Dads little Kubota tractor, which is used on a fairly steep bush block (not really what it was intended for, it's really just an oversized lawnmower intended for fairly flat property!). Filling the tyres with ballast made a big difference in terms of reducing the general bouncing, and definitely made it far less sphincter puckering on side slopes. Also greatly improved stability when the bucket was full, lot harder to get it to pick up a wheel.
I was pretty surprised just how effective it was given the thing has pretty small wheels, and a narrow wheelbase with most of the weight up pretty high. Think we worked out it would have been about 35 litres per back tyre, and don't remember what we got in the front, maybe 10L at best. But that 90kg being so low makes it really effective at countering the 900+kg the thing probably weighs with the front end loader, the grader blade on the back and someone sitting on it.
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30th Apr 2021, 06:41 PM #49Most Valued Member
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17th May 2021, 04:32 PM #50Most Valued Member
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G/box is working
Some progress here, i had a bit of mucking around getting the gears aligned and fitting in the gear housing but it worked out ok and i reckon it should do the job.
The spool was a fairly straight forward job but as you can see i needed some meat to attach the cable and for the grub screws but l also wanted to keep the diameter of the spool as small as practical so l left a shoulder at one end and then cut a groove to run the cable out.
There is still a few little things needed done but soon l will give it a bit of bog and a squirt of paint and it should look like a bought one.
some pics....
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8th Jun 2021, 05:01 PM #51Most Valued Member
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a bit more
Some more pics........I made a cable tensioner plate for the winch.. soz I forgot to happy snap it before fitting it so the 1st pic below is the best i could get for the mo.
The other pics are progress pics of the platform mounting and a couple of where the go go gadget is up to.
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8th Jun 2021, 07:09 PM #52Member
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Looking good shed. Did you get much shrinkage in the bearing housing as a result of the welding.
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8th Jun 2021, 07:38 PM #53Most Valued Member
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G'day tony, yeah it would have been a pain if the brgs didn't fit after welding, the welding was only on one side so I didn't think that it would shrink too much.
The brg diameters measured 51.995 and 61.996mm, I took a punt and bored the holes + .03mm, the 52mm brg went in a little loose and the 62mm went in a little tight, so good enough for what it is and no need for loctite, they will be fitted with copper coat.
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8th Aug 2021, 05:46 PM #54Most Valued Member
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Platform
This project has moved to second place on the to do list......thought i would give ya's an update tho.
We had a bit of a storm a few weeks ago that knocked the power out for 4 or 5 days, i got one hell of an earache because someones teeth were chattering, and i like to breathe at night, so i have been fitting a battery/inverter system to the house and it will take me a while to finish this.
Anyways here are some progress pics of the platform, this will mount on the disc pictured in the last lot of pics.
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8th Aug 2021, 09:42 PM #55Diamond Member
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8th Aug 2021, 10:30 PM #56Most Valued Member
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22nd May 2022, 08:57 PM #57Most Valued Member
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Back onto this
The missus wants to drag me away for a dirty weekend so I am back onto this.
some progress pics, the milk crate is pretty much ground level....
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25th May 2022, 06:42 PM #58Most Valued Member
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G/day fella's.
The winch is mounted to be able to pivot on a sleeve and bush, this is so that the lifter could be fitted with an overload/limit switch. The tab that engages the lug bolted to the gearbox has 4mm clearance to allow the winch to pull against the spring and as it does so the winch moves away from the limit switch and this opens the circuit in the up direction to stop the motor. To get a bit of a starting point here I attached a cable and put a 20kg load/weight on the winch then measured the force required to resist that force at the spring lug on the winch gearbox, I measured 7 kg there, I want the limit switch to cut the motor power at about 200kg, i have a 2 to 1 cable ratio so the winch itself will see 100kg, so a little calc said 100kg / 20kg = 5 x 7kg = 35kg. the spring that i have used requires 35kg to expand the spring 20mm, so the stop tab that the lug sits on has the spring stretched 20mm and then there is the 4mm clearance to allow the winch to pull against the spring to open the limit switch. I doubt that i have it right but that should be close and a good starting point.
I am using the wiring and relays from the chinko winch that i showed earlier in this thread, this has a control switch that can be plugged into the wiring loom if needed and also there are 2 remote controls, i think this will be good as there will be no control buttons for little fingers to fiddle with.
Trying to think what i have forgotten before i start squirting at it with rattle cans??
...some pics....
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25th May 2022, 11:40 PM #59
Hi John,
I think that I would have put a threaded adjusting screw on that big spring, then you can adjust the tension as needed.
Otherwise an interesting project, a lot of work but I'm sure that its worth it !Best Regards:
Baron J.
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26th May 2022, 06:59 PM #60Most Valued Member
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John I did contemplate that but there is not enough space available so i thought that if i need more tension on the spring then i will just make another tab plate to suit, not much work in that......
Hmmm.... yeah well if it reliably does what it is supposed to do then it wont end up hanging on a fence post looking like some sort of weird artistic curiosity
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