G0704 Setup - Tramming/Squaring to Table Issue

[GeneT45]

Dial a 1-2-3 block in true with your X axis, then check it along Y. No need to make any cuts - eliminate that variable from your testing to get started. It may actually be easier to tram your vise in, then check with a 1-2-3 block, but that does add the vise into the equation.

Additionally (and backing up a smidge) When you finish tramming did you run a single indicator across your range of motion? (Actually 6" should do). One downside to the SST kind of tool is that it's easy to get confused and have one indicator reading +0.002" and the other reading -0.002", which can look great, but really indicates a 0.004 offset. Sweeping a single indicator as a final sanity check eliminates this possibility.

GsT

 

[LorenB667]

I don't understand what you mean by "Dial a 1-2-3 block?"

Gotta ask questions to learn, right?

 

[GeneT45]

I don't understand what you mean by "Dial a 1-2-3 block?"

Gotta ask questions to learn, right?

I'm not sure which part you don't follow, so forgive me if I over-explain.

A 1-2-3 block is a precision block, ground on all sides, square and flat to a few ten-thousandths or less. It measures 1" x 2" x 3" (hence the name). If you don't have some (they usually come in pairs) don't hesitate to order a set, they're a fundamental item in every machinist's toolbox.

Because they're "perfectly" square, if you adjust one face true to one axis on your machine, running an indicator along either (or both) other axis' should tell you if there's a problem with your machine, as opposed to errors potentially caused by workholding or cutter flex or movement, or whatever that could foul a test based on cutting a block.
HTH,

GsT

 

[Uglydog]

Am late to the thread.
How large of cuts are you taking? To heavy a cut will
Are the spindle bearings, gibs and any other adjustable properly adjusted?
The problem might actually be flex.

Also, note that this is a mill/drill.
Great machine. But like everything has it's limitations.
For example my Cincy Toolmaster will never be a Moore Jig Borer.


Daryl
MN

 

[LorenB667]

I’m taking maybe 0.003”-.005”. Trying to take as little off as possible, just enough to make sure the fly cutter gets both edges of the block.

Once I get it all back together I’ll try again. Should be a few days.

 

[Uglydog]

Wow. That isn't very much.
What happens if you get a little more aggressive with her?

 

[Uglydog]

Have you tried clamping directly to the table?
Eliminate the possibility that it's not a vise problem?

 

[LorenB667]

Have you tried clamping directly to the table?
Eliminate the possibility that it's not a vise problem?

I am clamping directly to the table. Figured that it would be a good idea to reduce possible issues.

The depth of cut doesn’t change the outcome.

 

[Pevehouse]

Trying to wrap my head around everything g you posted in your first post. Not sure I will be much help though. I have been going through the same headache with my Chinese square column mill for about a year also. So far I have removed the head and stoned everything down on the column. Replaced the Chinese bearings throughout. Now about to start on the table end of things