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Another job off the list

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AdeV:
I'd been asked to turn down a motorbike triple tree (aka triple clamp or yoke), so a supplied bearing would fit on it. After much head-scratching, it was determined that a faceplate would be the most obvious option.

Of course... obvious != easy; it took a good 3 hours of tapping and adjusting to get the tube centered & running true. There must be an easier way...

Here it is mounted on the faceplate:


I used the mill clamping kit to hold it; the shims are necessary to make the tube run true (another  :thumbup: to Bogs, who gave me the brass shim stock that happened to be exactly the right size). I've already taken the first few cuts in the above pic. Because access was such a pain (the steering lock "bumps" on the yoke seriously impeded tool access), I ended up using the very edge of a Mircona parting tool:



Small, slow cuts were the order of the day. I gradually whittled down the main diameter until the bearing was an easy slide fit down the majority of the tube; the goal was to make the last 20mm (the width of the bearing) a reasonably tight push-fit. In the event, I got it down to that level, but the final cut just ended up a touch over; so whilst the bearing sat nicely, it didn't grip properly. A smear of Loctite was therefore employed to keep the bearing in place. Normally, of course, it'll be squashed up against the cup with a hefty bolt, so in theory the loctite is unnecessary.

The finished article:


I did get a little chattering on the final cuts, hence the slightly sub-standard surface finish; but this'll all be hidden away in a tube anyway, so it's no big deal.

Rob.Wilson:
Hi Ade


Would the spindle not just press out from the bottom yoke  :scratch:     ,,,,,,,,, all the ones i have done do     :)



Rob

AdeV:
Hi Rob - unfortunately, it'd been welded in; and I didn't fancy breaking the weld & re-doing it, my welding isn't that good yet.... and this is a bit of a critical component...

Brass_Machine:

--- Quote from: Rob.Wilson on May 28, 2011, 07:26:08 AM ---Would the spindle not just press out from the bottom yoke  :scratch:     ,,,,,,,,, all the ones i have done do     :)

--- End quote ---

Some are welded, some are press and some are even screwed in. I am using a set of Ducati triples on a Honda. Those have a screw in stem so it was just a matter of machining a new stem to fit the Honda neck and bearings.

Eric

Rob.Wilson:
That would explain It Ade  :doh:

lt looked like an ally bottom yoke  ::)


Rob  :)

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