So, I've finally got my new mill installed, (not so easy cos its at the bottom of the garden, literally!) and its vfd is functional. I still need to build a proper control panel, but i thought i needed to at least make chips!
since
the easy bit of the path...

the next bit...

The toptech DM15, a 6x26 style baby knee, in place...(table not yet replaced)

and (eventually) first result...

Now, some questions..

.
1. The mill is three-phase, powered by a 'powtran' VFD. Can anyone offer an opinion on the following questions...
What is a reasonable minimum frequency?
What is a reasonable maximum frequency?
These two questions will obviously determine what belt ratio I would use as standard, and if i would need to change it routinely.
2. I discovered that hot chips are hot,

having one insert itself into my collar. I am sure the scar will heal....Apparently my beard isn't long enough to catch them, and i know growing it longer is not a domestically-acceptable option. Does anyone have any recommendations for appropriate clothing to avoid this?
3. The mill has an R8 taper. When i first inserted the facemill, there was clearly a key of some sort in the spindle. By the time i got to the end of the second face of this bit of angle, there clearly wasn't, announced by significant slippage...
Some quick googlesearch revealed that as many people remove the 'key' (typically a set screw?) as take pains to ensure it is intact. However, I clearly didn't do the drawbar up tight enough. How tight should it be? The supplied bar is effectively a long bolt, with a threaded 'collar' which seats on top of the spindle. The collar can't be tightened when it is sitting on the spindle (recessed too deep).
4. Next task is to build a control 'pendant' for the VFD. I am planning on a large 'stop/start' button, smaller forward/reverse, forward jog, reverse jog, and speed pot, with a digital frequency meter driven from a 60-slot disk on the top of the spindle. I could fit this in place of the original mill controls under the table, or possibly higher up at the side of the column. Any comments on this plan?
5. I am starting to regret not springing for the powerfeed option (although that one didn't have 3phase), and will probably build one. Is it good/bad/otherwise to include controls for that on the main mill control panel?
regards,
russell
(theoldwindmill.net)