Tramming 101:
First let’s check the axis definitions:
The Y-Axis handwheel moves the saddle in and out towards the column
The X-Axis handwheel traverses the table past the column (also usually the longest axis)
We never have a problem with Z, it’s the vertical movement of the knee, quill, head whatever.
The biggest error is usually a rotation about the Y axis so this is what we check first.
A quick check with the square and test bar shows the gap:
![](http://i.imgur.com/Ui7nrn5.jpg)
Now as the test bar is “not a test bar” it’s not guaranteed to be accurate. So rotate the collet 180 degrees and check again:
![](http://i.imgur.com/x2egDTO.jpg)
Yes still there! So check the other side of the bar for consistency:
![](http://i.imgur.com/rSIBjqD.jpg)
![](http://i.imgur.com/oVUjtay.jpg)
So it is obvious that the left hand side of the table is Low and therefore the column needs packing on the Right hand side.
Now the column fixing face is a bout 160 mm wide so I will set the trammel to 80 mm. That way I should get a measure of the amount of shim needed.
![](http://i.imgur.com/oDgBFDH.jpg)
![](http://i.imgur.com/MEZfm0Y.jpg)
In the above photo the clock has been preloaded and the needle set to 0
Now rotate 180 degrees and we see we have dropped about 0.3 mm
![](http://i.imgur.com/0axcwwF.jpg)
So slacken off, add some shim ( I used a 15 thou (0.38mm) feeler gauge blade) and tightened things up and checked again. It was interesting that as I tightened the 4 bolts up I could “walk the error out”. Eventually all were tight and this is what greeted me:
![](http://i.imgur.com/jc90C0j.jpg)
Also even though there was a similar error about the X-axis when I checked that I was within 0.02 mm!
![](http://i.imgur.com/YxEhvSF.jpg)
![](http://i.imgur.com/cv95t9U.jpg)
I left the feeler gauge in place for the minute as I intend to start cutting some metal (Usuall new mill stuff “T” nuts, Clamp Bars, Table buttons, Circular Squares and the like. This should bed things down and then I will check again to see whats what.
![](http://i.imgur.com/9Ea5dtR.jpg)
I am pretty happy with the result so far. Can’t wait to start modding the mill!
This calls for a beer:
![:drool:](https://madmodder.net/Smileys/default/drool3.gif)
![](http://i.imgur.com/iM2KYvq.jpg)
A limited edition Westvleteren 10.2% masterpiece, bought to help save the Abbey! It the first time ever this beer was sold on the open market. You used to (and still do) turn up a the monastery and see what they will sell you!
Next up is to measure up for the DROs and start cutting metal
BTW: Great opening game to the 6 nations Pitty we (I am Welsh) didn’t win, but as I live in Ireland: Bring on Italy
Cheers WIll