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Posted by alan@jackary.plus.com on August 25, 2006, 5:26 am
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Hi All
I am planning to make a milling spindle for my chipmaster lathe. I
cannot decide which type of motor would be best. It needs to be
resonably small in size. I have a small single phase motor and have
thought of using a sewing machine motor but maybe they will be too low
on power. If I used a DC motor I would need a power supply which could
also vary the speed. This seems to be the best solution but I do not
know enough about power supplies any suggestions? I run the lathe via
an inverter which works very well and have considered switching it to a
3 phase motor for the milling spindle but again I do not think I can
get a small enough sized 3 phase motor. I beg you please do not inform
the electrical police about this.
Regards
Alan
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Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on August 25, 2006, 8:34 am
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> I am planning to make a milling spindle for my chipmaster lathe. I
It would be interesting to know hat size of mills you want to use and
how deep the cuts will be and what feed rate. By this, the power could
be calculated (more or less).
Nick
--
The modular DRO
<http://www.yadro.de>
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Posted by alan@jackary.plus.com on August 26, 2006, 12:11 pm
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Adrian Godwin wrote:
> >
> >> I am planning to make a milling spindle for my chipmaster lathe. I
> >
> > It would be interesting to know hat size of mills you want to use and
> > how deep the cuts will be and what feed rate. By this, the power could
> > be calculated (more or less).
> >
> >
> > Nick
>
> Can you explain how to calculate this, please ?
>
> I've got a Westbury-Dore mill fitted with a 1/4 HP single phase motor.
>
> I'd like to change it for a variable speed motor, and have a choice
> of a 440W DC motor or a 550W 3-phase motor (both with Eurotherm
> controllers). The 3-phase looks a good option, but is it pointlessly big ?
>
> I use cutters up to about 3/8", but would also expect to use a
> flycutter. I tend to take very light cuts due to the small size
> of the mill, but I'd be interested in knowing what is within the
> motor power range.
>
> -adrian
Adrian,
I modified my Dore Westbury head with a .5hp 3 phase motor via an
inverter woks very well adequare power and much smoother see
http://ph.groups.yahoo.com/group/tom_senior/photos/view/9f33?b=4
Alan
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Posted by Mark Rand on August 26, 2006, 12:19 pm
Please log in for more thread options wrote:
>>
>>> I am planning to make a milling spindle for my chipmaster lathe. I
>>
>> It would be interesting to know hat size of mills you want to use and
>> how deep the cuts will be and what feed rate. By this, the power could
>> be calculated (more or less).
>>
>>
>> Nick
>
>Can you explain how to calculate this, please ?
>
>I've got a Westbury-Dore mill fitted with a 1/4 HP single phase motor.
>
>I'd like to change it for a variable speed motor, and have a choice
>of a 440W DC motor or a 550W 3-phase motor (both with Eurotherm
>controllers). The 3-phase looks a good option, but is it pointlessly big ?
>
>I use cutters up to about 3/8", but would also expect to use a
>flycutter. I tend to take very light cuts due to the small size
>of the mill, but I'd be interested in knowing what is within the
>motor power range.
>
>-adrian
>
The conventional wisdom is 1 cubic inch of steel per minute per horsepower. I
don't think that I have ever achieved this rate while milling on the lathe
with a 550W motor. Maybe when turning 3" bar down to 2" bar with carbide bits
though.
Mark Rand
RTFM
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Posted by John Montrose on August 26, 2006, 3:39 pm
Please log in for more thread options On Sat, 26 Aug 2006 09:58:54 +0100, Adrian Godwin
>I've got a Westbury-Dore mill fitted with a 1/4 HP single phase motor.
>
>I'd like to change it for a variable speed motor, and have a choice
>of a 440W DC motor or a 550W 3-phase motor (both with Eurotherm
>controllers). The 3-phase looks a good option, but is it pointlessly big ?
Others will correct me if this is wrong, but I believe 1 HP is
generally equivalent to 3/4 kW (750W).
If it were me, I'd go for three phase every time as the controllers
can offer loads of useful features such as soft start, jogging, motor
braking, and almost-instant reverse.
I've seen posts recently (admittedly WRT surface grinding) that
suggest 3-phase motors are smoother and hence vibrate less. On a light
mill such as a D-W, this may be an advantage.
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