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Boyan,
most of the stone engraving bits are some form of Diamond.
http://stone-carving.weebly.com/
You will need some good dust extraction and good protection for your rails etc

peter

Sounds like the bearing is on its way out!
When they go the collet end gets very hot!
Put new bearings in should only be about £15.00

Peter

You could go down to 12mm dia ball screw.
The biggest problem will be finding enough room for the ball nut!
On my Sieg X1 conversion I used RSW ball nuts which have the smallest dia, when I did...

The toolstation ones are not that good but they cheap enough to learn on!

Peter

Toolstation has some 1/8 with 1.4 shaft Toolstation > Power Tool Accessories > Router Bits > Router Bit Straight Imperial
Peter

Just a quick thought -- you have reset the emergency stop button!!

Peter

Look at link to solve some of the problems!
http://www.sonsivri.to/forum/index.php?topic=33768.0

Peter

Problem with fine dust extraction is the clogging of the filters.
Most woodwork shops do it using 2 filter extraction systems a high rate coarse filter as in the one you pictured and a fine dust air...

3 stud PCD= S/0.866

peter

Personally to start with I would get some morse 2 collets, the er32 collet holder will limit the z travel.
Next get a couple of vices, one rotateable base the other a possible 4" with as little...

Try arc-euro as they have some spares.
http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/X2-Mini-Mill-Spares
Although not many now
Peter

Only thing I can say then is that the only driver I have that exhibits those symptoms is kaputt!!
I even tried other motors on the driver - same result!
Peter

Hank
Try these http://www.bohan.co.uk/setrings.htm
Dont know the price but at least they list them.

Peter

Just found these http://www.crownhill.co.uk/level3.php?cat=51
and a price!
At 60p...

Personally as not very knowledgeable in CNC I have gone down the road of buying the odd one of ebay as I feel it is not worth while investing in the best quality as I will only ruin it.
I am sure a...