Sieg SX2.7 CNC conversion

[Edward]

Hi there!

Well the SX2.7 fits nicely in between the two. Far better than the SX2 in every sense, but not as good, in some respects, as the SX3. I could've easily bought the SX3, but I wanted something slightly smaller and with a better Y cross travel (180mm) The SX3 has less, at 145mm.

As far as modifications, for the Z axis, the standard ballnut will fit exactly using the original housing, so no modifications needed. For the Y axis I made my own ballnut housing, from a block of aluminium, easy to do. Otherwise all is fine.

The X axis is the one where you have to work a little. I had to mill one side of the ballnut flange, take a chunk off of about 6mm and then I had to grind the saddle at the very end to make room for part of the ballnut. I also had to grind a small groove across the saddle, not deep at all, just enough to gain clearance, as the ballscrew needs to be fitted slightly lower than the original leadscrew (because of the thickness of the ballnut). I didn't have to touch the table at all.

The rest is the usual end plates for which I used 20mm aluminium.

The only misgivings I had about it is the fact that you can't rotate the head, but as it turns out, after lots of measuring, (I did it following Hossmachine video on YouTube) it is running parallel anyway, thankfully.

It is a lovely machine, I also have the SX2, which was my first machine, in my opinion, for a CNC conversion, no comparison, I mean the SX2.7 without a doubt:)



It's not unusual to modify things a little. I did it all with a Dremel and a bit of patience, not too difficult really.

Edward