Jig Development, last part.
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Magnification
A cheap plastic Fresnel lens solves the legibility problem.
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Purge Hoses
I decided to integrate purge fittings now rather than having to retrofit later.
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Purge well
So I cut annular wells into the support arms beneath the contact points, then drilled and tapped a gallery hole for a BSP gas fitting. On this arm I changed my mind about which direction I wanted the hose to face so I plugged the hole.
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Purge disc
The support discs are stacked laser cut 5mm stainless plate, the vent holes placed to align with the well in the support arm. The design should help reduce the turbulence in the gas as it enters.
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BB Assembled
The BB post uses a similar arrangement
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BB Discs
Two of the holes are used to rivet the discs together using 6mm Ti tube leftover from the bottle cage project: gotta love the idea of titanium rivets. One of the discs for the outer puck has only these two rivet holes, these are tapped for M5 grub screws to prevent the gas escaping out the holes.
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Rear Arm
After chopping and changing on the rear arm design I went with simplicity on the grounds that less interfaces mean less misalignment, it also reduces the number of pieces that need to be machined: the two 16mm blocks shown are placeholders for a single machined block which will have alignment grooves on the bottom surface.
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Rear Arm 2
The dummy axle is off the shelf from Alex Meade, the dummy axle holder is a tube block off the shelf from PMW.
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Rear Arm 3
The idea behind this arrangement is that the dummy axle and its holder stay in the frame, so there's a simple mechanism to allow release and realignment. This gets over the problem I had with the previous system (from Alex Meade) where I needed to realign the dummy axle every time I took the frame out of the jig.
Re: Headbadge development.
Something I left out: obviously between the hammering and the sulphide treatment the flat silver is curved to fit the head tube. Since four nines silver is quite soft even when work hardened by hammering, this is done by pressing the piece between a 31.75 mm PMW tube block and a chunk of 30mm aluminium rod.
Re: Headbadge development.
Re: Headbadge development.
Holy crap. Now that's a process. Wow.
At the end, what are your thoughts? Are ya digging it? Improvements?
Re: Headbadge development.
Was that in reference to the bikes or the headbadges?
Assuming the latter, I'll use what I've got and see how they hold up. I think I will have to protect them from exposure to the elements so I'll use the lacquer I used to use on the brass faceplates of the audio equipment I built. It's called Like Armour and is made by an Australian mining products company called AROA: pdf here.
Re: Headbadge development.
Re: Headbadge development.
I'll wirite up a fulle description of the fatigue tester when it's all done and dusted, meanwhile here are a few pics, starting with my Heath Robinsonesque method of checking that the force sensors are reading the right way:
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Calibration Rig
The force sensors attach to a box with two strain gauge amps, a PLC and some associated power supply stuff:
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Control Box
Unfortunately the box doesn't look like that any more because I let the smoke out of one of the strain gauge amps today.
More to follow when I get this fixed.
Re: Jig development again
Mark - I haven't looked into it yet to check, but... I'm pretty sure I saw a Lyrebird on my ride this morning, in the Ku-Ring-Gai National Park (just north of Sydney). Is that possible / likely?
And yes, I was on my Lyrebird!
Re: Jig development again
Not one of mine.
There is precisely one person in Sydney with one, and he has two. Hog.
Re: Jig development again
Erm, I meant the bird...!
Re: Jig development again
Ahh, sorry.
Dunno about Ku-Ring-Gai but I know there's a population in RNP at Audley, so it's at least possible.
Re: Jig development again
Hmmm, not convinced now - it sort of looked like the pic below (which is a Lyrebird) from memory, but it legged it when I tried to go back for a pic. I recall two distinct tail feathers, but they were more like the whispy ones than the dense, dark ones.
http://animalia-life.com/data_images...-lyrebird3.jpg
Re: Jig development again
Lyrebird numbers on the rise.