Boring for real now. Fingers crossed it all comes good in the end!

A few passes with the fly cutter to come down to width. The CNC really comes into it’s own hrre. I wrote some basic GCODE to run the cutter across the job with a slow feed. The cutter is slightly narrower than the area to be cut, so it needs to move and make another pass.

So, basic GCODE does a slow pass on the Y, then a rapid move away and across on the X. Another slow pass back on the Y, finishing with a rapid move back to the start. I’m not 100% on my calibration with the Z axis, so I put the cut on manual by raising the knee.

Like hybrid – which saves me time and is easy to use. And the bonus is that unlike a conventional power feed, I don’t have to watch it like a hawk as it moves to a safe place and stops. 🙂

At some point I’ll sort out controlling the spindle motor. A job for Ron!

Now I’m happy with my boring setup, I’m working on the big end for real. Setting up the rod on the Bridgeport is probably the hardest part, as it takes ages to get everything straight and level.

The Mk I eyeball isn’t accurate enough, so it’s a job for Uncle Ernie’s clock. One of a few things of his I still have. The rod is a bit thick at the bottom so will need finishing to the bearing width. I’ll aim for the same bore diameter as the bearing is a good fit in the test piece.

A bit nerve racking as a lot of work has gone in so far, and it’s so easy to muck things up – especially bore diameters!!