Pm-932m-pdf

I don't have anything worthwhile to add, but I thought I'd chime in. I have a 932 as well, but I've yet to take any serious time to check out my Z gib. I appreciate you guys looking into it and posting your findings/solutions.

.022" is huge. Makes me want to throw an indicator in my spindle and check it against my column as well. My initial thoughts would be that it's a head-to-column issue. Shimming between the head and the column would be a bear though.

Just to clarify, which surface are you indicating against on your column?
 
richz said:
Last night I removed the gib. It was .309 on the top and .219 0n the bottom. I started wit a .020 shim but it was to tight. ended up at .011 and this took care of that problem. Next problem, with an indicator mounted in a collet and the indicator on the face of the column I am getting a difference of .o22 from top to bottom when extending the spindle. The bottom is closer than the top. What should be my next step?
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Did you try the feeler gauge method I suggested in my post above? It would be interesting to know what the clearance is at the top of the Z saddle. I thought I had my gib adjusted correctly until I checked the top clearance. Had .012" clearance. You might also try Bill Miller's method mentioned above. There's a lot of weight you have to overcome to get the proper gib adjustment.

Tom S
 
I used Bills method and believe I have the gib adjusted correctly. I was indicating on the larger machined surface of the column and getting a difference of .022 between the spindle all the way up and all the way down.
 
richz said:
I used Bills method and believe I have the gib adjusted correctly. I was indicating on the larger machined surface of the column and getting a difference of .022 between the spindle all the way up and all the way down.
Click to expand...

Have you removed the head and Z axis slide and checked for burrs and measured the mounting surfaces for parallelism? Just thinking out loud.

Tom S
 
That's going to be my next move when I get home tonight TomS
 
richz said:
That's going to be my next move when I get home tonight TomS
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Have you made any progress in identifying the cause of your "nod" issue? I'm curious and want to hear that you've solved the problem.

Tom S
 
Same deal for me, adjuster is all the way in and it still has some slop and definitely no drag. Keep us posted!

Alex
 
I don't understand why you are using the Z axis. I set the Z axis "close", lock it down, and then use the fine adjustment on the quill, been doing it that way since day one with my 932.
The Z axis does move some when you lock it down but if you tram your machine with the Z locked then it doesn't matter how much it moves.
 
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