X and Y not square

R

rzw0wr

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Still working on my not too good mill.

I have everything set to about .001 or less.
Mill works great.

Today I cut a piece and found that the Y travel and X travel are not square.

Rechecked my vise on the X axis and it is less than .0005.

I put a solid square in the vise and checked the Y axis.

Out about .010 in 6".
Checked with another so;id square and got the same reading.
.005 out in 4"

I suppose the only way to fix this is to scrap in the gibs.
The only problem I have with that is changing the angle on the gib plate.

Any other suggestions?

Thank you,
Dale
 
+1 to benmychree

There are many things that could be causing this. What mill are you running? Has it always done this? Is it new to you? Are you doing these checks with the table and saddle locks on?

I ask this only cause we see so many new to an owner mills that are sworn everything is mad tight, but it obviously isnt.

Jon
 
What are you using for the squares? Before attempting any correction on the mill I would want to verify that the squares are square..
 
If it is using tapered gibs check the fitment on them (bluing them up etc).
If the dovetail way is off in theory you just need to scrape one side and refit the gib on the other,
 
A couple of thoughts and questions. (In no particular order)
Are you sure the square block you are starting with is actually square?
When you make your test cut in the Y are you locking the X axis? The table could be moving to take up the X backlash.
How are you measuring the squareness of the cut after you make it?
From your numbers, .005 in 4 inches is not the same taper as .010 in 6 inches. There is something wrong somewhere in your process.
 
A few thoughts and questions. (In no particular order)

.005 in 4 inches is not the same taper as .010 in 6 inches. This indicates there is something not right in your process.

How are you measuring the squareness of the cut?

How square are the blocks you are starting out with?

Did you have the X axis locked while making the Y cut? It is possible (and Common) for the table to be moving within the range of your backlash while cutting.
 
To measure the squareness I used my solid square and double checked it with my Starrett square.
My X axis will not lock. I did remove all of the slack.
 
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