CNC MILL 7
Z axis problem fixed!
My friend Stuart T methodically checked the wires and connections, and diagnosed a problem involving the Z axis encoder. He resorted to removing the encoder, to look at it more closely, and said ” that came off a bit too easily. I wonder if the shaft is connecting properly”. Sure enough, the shaft was loose, which explains the bizarre Z movements followed by a total loss of position information. Someone has joined the 6mm shaft to a 1/4″ socket, and it had probably worked loose during the transport from Echuca to Geelong.
So we quickly made a sleeve to join the 6mm shaft to the 6.35mm socket, tightened it all up, soldered a few wires which broke during the inspection, and hooray it all worked perfectly. Hallelujah.
Oh, and that $20 Chinese hand wheel. It was 10 mm thicker than the originals, and looked out of place, so I chucked in the the lathe, and turned it down to the same 18mm thickness as the originals. It was made of hard plastic-bakelite material which smelled really offensive while I was machining it, and was very abrasive. Tool steel lathe bits were just worn away, but a carbide insert tool coped OK. The reshaped hand wheel looks and feels much better.
Just the oil lubrication pump to fix, then I can start making chips.