Re: Captain Nema Nemo

--- In CAD_CAM_EDM_DRO@y..., <info.host@b...> wrote:

> Hello,
>
> I have found a few triple phase 415V static converters, they're

about

> £250 - 300 for the HP range I'm looking at. I have found some 2

pole single

> phase motors for much less with RPM's of 3000 and 1500 on 4 pole.

This is

> for the Beaver VBRP, I don't have triple phase and the guy's not

sure if the

> motors even work. I'm wondering if it's worth buying a static

converter if

> they do or if I'd be better just saving myself some money and

getting single

> phase. I know triple phase runs smoother but is twice the cost

really worth

> it? Especially after the beating the motors will have taken over

the years.

>
> The spindle motor won't be specifically made only for the

Beaver will

> it? It appears to be face plate mounted, I should be able to

replace it with

> another standard Nema sized motor shouldn't I? There are some

pictures in

> the Photo's section. A few more things, I could wire brush the

table back to

> a nice clean finish but would it be acceptable to bring the table

back into

> good backlash settings and then pass a fly cutter over the table to

skim a

> small layer off and level the table again? Or would that be too

risky and

> fill the table with unevenities? I bet you're going to say it

wouldn't reach

> to the end bit of the table. : )
>
> I have £842.90 in my bank account - £450 for the mill = £392.90
> £392.90 - £23.44 for a starter - £88.07 2hp 2 pole 3000rpm motor =

£281.39

> for simple tooling and cosmetic bits, possibly a cheap coolant

system from

> an Enco like joint
>

John,
First off the motor will be 4 pole 1425 rpm. It gets the top speed
from gearing up. Yes the spindle motor WILL be special on the Beaver.
The speed change on this model Beaver is by expanding pullies like
the variable speed Bridgy head and as such has a longer, special
shaft to carry the sheaves.
I'll bet you that there is nothing wrong with the motor. They are a
very beefy unit. You can air drop these on Bosnia and they'll still
run OK.
You can get a new motor to fit, it will just take a bit of working.

From the prices you have mentioned on motors these look like Machine
Mart prices.
Steer clear of this rubbish it's absolute crap. In fact it's worse
than crap.
General rule of thumb for a motor is 750 watts = 1 Hp
That doesn't take into account efficency so if you have a one bar
electric fire taking 750 watts, in theory that's 1 Hp but nothing's
going round.
Do you get the point?

Decent starters cost around 45 quid. Half for the contactor and half
for the thermal.
If you want to go either way contact me off list.
I'm sure I've still got a 3HP brand spanky new Brooks Crompton motor
somewhere kicking around you can have cheaper than a Ying Tong
Diddlie I Poe model. Probably with a starter unit built in. Can't
remember how they were built.
If not I've got a 3 Hp invertor somewhere for the same price.
I just need to dig around for a bit, The filing system isn't 100%

Leave the table alone. A few dings and cuts won't affect it at all.
If it's looks you are worried about take a look in the file section
and see if my picture on a mill tray for mounting vises is still
there. This covers a mutitude of sins and is effective to boot.

As regards a coolant system, the base of the Beaver is the tank.
There should be a pump behind the rear cover but it will be 3 phase.
Just take it out, chuck it at next doors cat and fit a single phase
25 quid pond pump. Ipso Facto job done, sorted.

BTY it's THREE phase, no bugger knows what you are talking about here
when you mention tri phase.

JS.