If it were .33hp rather then .37kw, I've got a 48 frame dual volt motor from a
J&S sensitive drill that's getting in the way.
71 frame seem to be common, but someone out there must make a half hp 56 frame
2 pole motor!
It's for my to-be-cnc BCA milling machine. I want to mount the motor
next to the spindle (which I have replaced with an ER25 straight shank
collet chuck, as Lorch long series collets for a BCA are scarcer than
hens playing cribbage) rather than have a long belt to the back, so I
can use it horizontally.
A 48 frame would be extremely good though, 56 frame is only just small
enough to mount so it is at the same level with the spindle, ie with
both pulleys at the top. My thinking is that mounting the motor above
the spindle would make it wobblier.
But I wonder whether it would be powerful enough. How big a milling
cutter would it drive? 12mm would do nicely.
Am I correct in thinking that a 3-phase motor is more powerful than an
equally rated single phase motor?
One alternative might be a DC motor?
I've seen single voltage ones, designed for sewing machines, but I can't
find any dual voltage ones.
-- Peter Fairbrother
Unless your BCA is much bigger than my BCA (possible, mine's actually an Excel
model 0), then even a 48 frame motor is far too big to hang off the side of
the head. I suspect you need to look for a high power brushless DC motor/servo
motor and be prepared to gear it down 2:1 or more if you want to hang it off
12mm in steel seems very large for the BCA spindle, although a Mk3 might cope.
Mine's a later model (unknown, looks a bit like a BCA Mk.2 but not
identical) but not too dissimilar - but a 56 frame motor will just fit,
and a 48 would fit easily.
I suspect you need to look for a high power brushless DC motor/servo
I'm also considering something like that.
Spindle's been replaced with an 8" 20 mm straight shank ER25 collet
holder - which is presumably designed to be okay with 12mm in steel? Not
as hard as the original spindle, but a lot tougher.
Bearings are (new) plain bronze at the moment, but I plan to fit
probably taper rollers later.
What I was really wondering is whether 1/3 HP is enough power?
-- Peter Fairbrother
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