The 3-phase problem is best solved with a VFD rated for single-phase input.
They are commonly available for about $200. The VFD provides soft start,
variable speed, dynamic braking, reversible on the fly. Another advantage
is you will not have to use the BP variable speed pulley system which is a
known maintenance item. www.automationdirect.com is a good source for
VFD's.

If you can spend a little more for a DRO, I recommend the Newall 2-axis. It
is very easy to install, with hermetically sealed scales and reader heads.
Plus it comes with an assortment of mounting brackets that will fit damn
near anywhere on the mill.
www.candomachinery.com is a good source for DRO's and sells several
different brands. For the quill DRO(3rd axis), the little dedicated
Mitutoyo unit is easy to mount, battery powered, easy to see. Most any
place that sells Mitutoyo handles them.

Randy

"FLowen" wrote in message
om...
Milling machinist wannabee is the proud new owner of a 25 year old
Bridgeport Series I vertical mill, being delivered this week. I will
be using the machine to fabricate firearm parts, mostly small parts.
10 pounds would be an unusually heavy piece. Being a newbie I need
some real basic advice.

1) My concrete floor is out-of-level by 1/4" side-side across the 2'
width of the machine base, and 3/8" front-back along the 3' length of
the base. Would leveling pads be advisable?...or would steel shims
under the base bolt holes be just as good? Or is anything at all even
necessary?

2) I have single phase power. The mill is a 3 phase 2HP. No CNC
equipment in the foreseeable future. I will add a DRO, and probably
traverse power feed (I have longitudinal). I believe the power feeds
are 110VAC plug ins and if so would be a separate circuit. I have
gotten the full range of recommendations. Some say a static electronic
converter at $150 is plenty sufficient; others say I should go with a
$500+ rotary converter with a 5HP capacity (I don't plan to add any
other 3 phase equipment); and one fellow suggested making a "pony
motor" from a used 2-5 HP 3 phase motor, wired with the 2 legs of
single phase input power to 2 of the 3 motor terminals, and then the 3
terminals to the machine, equipping the pony motor with a hand start
pull cord, ever hear of that? I'd like to hear the thoughts of you
experienced folks.

3) Suggestions as to a good 2 axis (with the 3rd on the spindle if
affordable) DRO system a capable mechanic inexperienced with DROs
could retro-fit?