Indicate holes for nordic track motor mount?

[slatronic]

I'm currently working on converting my KX3 clone to use Hoss's nordic track motor conversion. The sangmutan motor and control have no torque what so ever as others have commented on.

My problem is how do I best indicate the holes around the outside circumference of the tube to hold motor? I dont have a rotary table but I do have a bridgeport mill to use. I'm guessing there has to be some trick to locate holes at 90* from each other. There is another option to use use epoxy but I would rather use four set screws at 90s around the motor. If its better to epoxy the motor let me know and I'll forget about indicating the holes.

thanks
jeff

I'll include some pics of conversion after I get a little farther along.

[TXFred]

You could mount the tube end down on the mill's table. Locate the center, and then it's a simple matter of using X and Y motion to move to each position.

You will then need an L shaped scribe mounted in the spindle to make the marks on the outside wall of the tube.

Alternately, lay the tube on its side. Find center, and drill all the way through. That gives you two of the four holes.

Run a piece of drill rod through those holes, and put a level on the drill rod. Adjust until the rod is perfectly horizontal, and now you can drill your second two holes.