From the Winter Palace
I gave the presentation to class, lecturers, and TADTAS representatives on wednesday. This is a simple bearing pivot that is bolted to the concrete floor. It holds a motorised bathroom chair used by a disabled man.
posted by Jonny at 10/18/2007 01:45:00 am
I aim to speak only the truth. If you find what I say to be funny, that is no reason to diminish the value of my first statement.
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6 Comments:
Looks good Jonny. What is the weight capacity of the bearing system? How big a disabled man can it lift?
Designed for 120kg suspended 600mm away from the center with a safety factor of about 4.
So 2 people could sit on it. If two people were jumping up and down you would start to worry.
The Therapeutic Goods Act was not alot of help to me and IS9001 is too vague.
It would fail in the bending of the shaft or cracking of the concrete. The bearings themselves could take about 6 tonne while spinning at 20,000rpm.
Looks impressive, Jonny. What was involved in your presentation? And how was it received?
Thanks Dad. A computer screen is always projected onto the wall, so we use a powerpoint presentation. I used these CAD pictures plus a few others. I also provided some stress calculations for the bolts in tension and the shaft in bending etc. It was a 10 minuit talk. I had 3 others in the team but I had designed the whole thing myself. (I can be a bit overpowering sometimes).
There were some questions at the end, which I hope I answered fairly well. My best answer, "yes I did do the calculations for the dynaBolts but I just didn't want to bore you with the numbers in this short talk".
Plus we just submitted the 20 page report today.
I'm so unpractical minded - as you know. So the thing *I* don't understand is why a man needs this thing - is it to keep him 'stuck' to the floor so his wheelchair doesn't roll away? No, it can't be that; wheelchairs have breaks. Forgive me, I'm a bit tired.
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