G0602 spindle nuts

[Flenser]

I know this is a dumb question, but I have to ask. Is there any magic to removing the spanner nuts on the back of the spindle? I want to replace the gear in front of the pulleys with an optical disc. I've put so much torque on the nuts the slots are starting to distort, and they still won't budge. I'm basically just holding the inside nut and trying to turn the outside nut CCW. Nothing. Are they reverse threads??

Thanks,
Jeff

[Flenser]

Update:

They're right handed threads. Just needed more force. I had to make some longer spanner wrenches, BFS 9000's...

Jeff

[Crevice Reamer]

Hi Jeff. Glad you got them loose. Just remember, the first one sets the preload on the spindle bearings, and the last one locks it.

CR.

[Flenser]

Thanks, CR. I was just about to ask that exact question

[Crevice Reamer]

YW!

Adjusting G0602 Spindle bearing preload:

1. Loosen adjusting nuts. (regular counterclockwise)
2. Tap head stock until it has end slop.
3. Tighten by hand until nut stops moving.
4 Tighten with wrench another 1/4 turn.
5 Hold that nut and lock the other against it.
6. Run at high speed. If it gets hot, loosen slightly. If it stays cool is ok.

CR

[Flenser]

Thanks for the tip. One of the bearings used to get pretty hot, but it stays cool now.

BTW, if anyone plans to use the cnc4pc index pulse card with the g540, they are not compatible. The g540 wants 12V and the index pulse card outputs 5V. It took me a little while to figure out I needed to break out that wire from the g540 side of the parallel cable and connect it directly to the card.

Jeff

[rwskinner]

Pretty easy fix. I entered the information a couple weeks ago. Just neep to add a NPN transistor and resistor available from Radio Shack (used to be anyways).

[Flenser]

I ended up flipping the output to active low, and used a pull down resistor between the g540 and pulse card. I was dropping pulses the other way, not that many but it was enough to give me something like a 1% error in RPM. I was just guessing at the cause, but the error went away after I rewired it. I guess a transistor makes a better sink, but so far what I have works...

Jeff

[rwskinner]

I tried a pretty stiff pull down resistor but it wasn't working properly for me. I'm dead on with the NPN sinking it to ground. Glad you got yours going.