Hi folks,

I have more free stuff available. Collect from Edgmond, Shropshire. 
Please e-mail me quickly (cdt22 AT cantabgold DOT net) or post here if 
you want any of this stuff. Feel free to ask questions. No scrap merchants.

* 3 x harrow/cultivator spring tines, probably for a Triple K.
* Assorted high voltage insulators.
* Galvanised angle crossbars from the top of HV poles, two for 11 kV,
   one for 33 kV. Perhaps good for making a huge trolley?
* Cool cast iron electric refrigeration compressor, but removed from
   its case.
* Aladdin paraffin heater. Tatty but possibly restorable.
* Godwin electric water pump. Big brass pump. 1" BSP I think. Broken
   terminal cover.
* 2 x empty 2 kg carbon dioxide fire extinguishers.
* Petter A1 high fuel tank bracket.
* A few sheets of mild steel 2 m x 1 m x 1 mm. Heavy surface rust, but
   it could probably be cleaned off.

The Calor blowlamp and 1.5 kW motor from my previous posting are still 
available.

Best wishes,

Chris

Anyone know where I can get a frame 56 (or smaller) 0.37 kW dual voltage 
three-phase motor, pref 2800 rpm, for use with an inverter?

The frame 56 bit is the hard part.

Thanks,

-- Peter Fairbrother

On Thu, 07 Aug 2008 06:14:27 +0100, Peter Fairbrother 
wrote:

>Anyone know where I can get a frame 56 (or smaller) 0.37 kW dual voltage 
>three-phase motor, pref 2800 rpm, for use with an inverter?
>
>The frame 56 bit is the hard part.
>
>Thanks,
>
>-- Peter Fairbrother

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!

Mark Rand
RTFM

Mark Rand wrote:
> On Thu, 07 Aug 2008 06:14:27 +0100, Peter Fairbrother 
> wrote:
> 
>> Anyone know where I can get a frame 56 (or smaller) 0.37 kW dual voltage 
>> three-phase motor, pref 2800 rpm, for use with an inverter?
>>
>> The frame 56 bit is the hard part.
>>
>> Thanks,
>>
>> -- Peter Fairbrother
> 
> 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.

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?

> 
> 
> 71 frame seem to be common, but someone out there must make a half hp 56 frame
> 2 pole motor!

I've seen single voltage ones, designed for sewing machines, but I can't 
find any dual voltage ones.

-- Peter Fairbrother

On Thu, 07 Aug 2008 19:22:02 +0100, Peter Fairbrother 
wrote:


>
>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.
>


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
the side.

12mm in steel seems very large for the BCA spindle, although a Mk3 might cope.

Mark Rand
RTFM

Mark Rand wrote:
> On Thu, 07 Aug 2008 19:22:02 +0100, Peter Fairbrother 
> wrote:
> 
> 
>> 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.
>>
> 
> 
> 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. 

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
> motor and be prepared to gear it down 2:1 or more if you want to hang it off
> the side.

I'm also considering something like that.

> 
> 12mm in steel seems very large for the BCA spindle, although a Mk3 might cope.

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