PM-1054TV Mill with broken worm shaft - help needed

[matthewsx]

I’d try calling Precision Matthews first thing in the morning. No doubt they’ve had to deal with this before. You’ll need to order the parts anyway.

John

 

[davidpbest]

If you partially loosen the four hex-head nuts that secure the J-Head to the knuckle, you can tug the J-head away from the knuckle just enough that it will be free from the worm gear that is used to tilt the head side-to-side. Then you can rotate it further upside down and bring the knee upward so the J-head rests on the XY table and knee. Once. you have it supported on the table/knee, you can then remove the 4 nuts and get a look at whether you have damaged the worm shaft or the pinion gear casting (or both).

You can see the worm-shaft (yellow arrows) in the photo below:

It meshes against the pinion (red arrow) on the knuckle but it not captivated by it once the head is pulled away.

 

[davidpbest]

DO NOT remove the motor from the J-head - that will open up an entirely different kettle of worms. (been there).

 

[7milesup]

All excellent advice, David!