Been waiting for these to arrive so I can CAD up another section of the design.
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Mon Feb 05, 2018 2:35 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
More machining.
Machining down some 30mm bar to 20mm for a shoulder, then stepping the rest down to 15mm & 14mm.. So much swarf
Pressed the bevel gear on and began machining the over sized boss down.
Machined the shaft down to 15mm for a bearing.
Machined down the otherside to 14mm, need to reduce the shoulder at the bevel gear as soon as I can find my left hand tool.
This gear needs bored out to 14mm to press onto the above shaft, unfortunately I only have a 13mm drill bit and a boring bar that wont fit in anything less then a 16mm hole This will have to wait till I can get a smaller bar.
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Fri Feb 09, 2018 9:13 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
quote:Originally posted by Glen:
Put a 10mm end mill in the toolpost in cut it that way
Saving my bacon once again Glen Almost went to H&F to spend ~$100..
Will drop some beers around to yours next time I'm in the neighbourhood _________________ https://www.halfdonethings.com/
Fri Feb 09, 2018 12:37 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
So how did it turn out? I have been saving that trick up for ages - it should do a good job in theory. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Fri Feb 09, 2018 7:43 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
It worked.
Had to go really slow as I was using an MDF packer to get it to the right height for the cut and I was expecting it to shift if I gave it too much.
I'll have to get around to making a holder for this in future to make it more rigid. _________________ https://www.halfdonethings.com/
Fri Feb 09, 2018 11:23 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
A combination of 3D printed test parts and some machined parts.
The uni joint join gets trimmed down to the minimal amount that I will be able to still TIG weld
Mock assembly. The pivot on the hub is a little off still and doesn't match the center of the uni joint, so it might need adjusted further depending if it causes binding.
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Wed Feb 14, 2018 2:15 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Another revision of the hub, now featuring dual bearings and some adjustments to the offset.
The wheel hub had to be flipped to the outside to reduce the offset by 5mm.
Currently have a pair of ball bearings on the steering hub pivot points, but they are a bit over kill and will likely be replaced with some smaller units or potentially just some bushes.
Quick mock up so I could measure some bits, cad up some new parts and get the printer running.
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Sun Feb 18, 2018 11:55 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Uni joint welded to the shaft
Reassembled into the ver5 (6?) steering hub
Pressing the centre bearings.
15T press makes this a simple job compared to hammering.
Winning.
Will eventually shim the depth the bearings press into the housing, for now though, it’s just till it touched the gear
Quick dummy up, it’s pretty close to the reference design, it might just work!
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