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Bright Mild Steel has not been polished, it refers to mild steel in its bright drawn form which is significantly straighter and flatter than hot rolled mild steel.

I've no experience with the SGR gear. I used TBR supported rails on my mini-mill - they've served me well and continue to do so, but if I was building it again I'd use the HIWIN profile rails that I...

If you have or plan to make a rigid machine, 3kw is better. Some extra speed and power does not hurt.

Nothing stops you limiting bit size with rigidity and having a spindle that's ready for your next machine ;-)

2.2kW have the advantage of the ER20 collet size, of course.

2.2Kw is the one most people seem to use but the 1.5Kw are Ok as well it is worth going for the water cooled version as they are very quiet.

I used a 2.2KW water-cooled spindle on my first MDF-built machine. OTT but I was expecting to re-use it on the mk2. However, it was responsible for warping the Z platform over time - too heavy and...

There are several on that site!! 3Kw might be to too much for your macnine

Some small progress.

At the end i found the cable problem that was making all time my Z axis servo trip. I measure all- fine, test the machine and the Z trips. measure again all connections fine....