Thread: Enlarging the axle hole on Fork Leg

Perhaps make a short mandrel on your lathe that fits in the mill chuck at one end and is a slip fit (but not as tight as the actual axle) on the axle hole at t'other end.

Assuming your square is square and long enough.
That the axle is straight(which it should be)
Push the axle through the fork until it almost touchs the table. Tighten it.
Put the square on the table and measure from the square to the axle. If its the same top and bottom its square. I'd do it "long" ways first. Then the twist.
Close enough?

Assuming of course your spindle is square to the table.

Stuart

The mudguard mounting bosses could be a better place to clamp than the thin hollow casting. Maybe you could pack up and use shims on either side to adjust in one plane, and is that a thru-hole I see near the caliper mount? - It could be similarly be utilised to adjust in the other plane. To check, machine a stub to clamp in the axle hole and use a dial gauge mounted on the mill spindle.

Jordan

Thanks guys. All good ideas.
Stu- that is the way I thought of and is what I have done, but stopped before making a cut to see what the 'forum of wisdom' has to say.
It seems to be square but that does not guarantee that the axle hole is square as well....

I thought of using the mudguard mounts to hold the leg, but wasn't sure of how I was going to do it securely, that would hold when I started drilling.

The mandrel might be a quick way to check it...

Sterob

I would clamp using the bolt holes in the strut into a plate, shimming under the holes as needed. Put the axle in the hole and with a finger type dial indicator touching the axle, check the squareness for the full stroke of the quill, shimming the strut until the error is gone or as small as you can get. Repeat the process with the indicator 90 degrees on the shaft to the first. In other words square up the X axis and then the Y axis. It may take several attempts until you're done. The longer the distance the indicator travels the smaller the error of the setup. Once aligned you can add additional support and clamps as needed, verifying the setup hasn't changed. Once satisfied with the alignment, position the part under the quill by dialling the hole and bore to your hearts content.

Pete