RE: [CAD_CAM_EDM_DRO] Constant Torque VFD

I've got the 1.5kW Hitachi from the same place (good guys to deal with).
It's driving a 2hp 2pole motor geared (timing belted) down 2:1.

Here's a pic of the 25mm hole I drilled with it.
http://www.cncathome.com/New_motor_and_drive.jpg
I use it either by the front panel or from Mach using the little circuit on
my VFD page http://www.cncathome.com/vfd.html

PK


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of hannu
Sent: Saturday, 19 January 2008 3:32 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Constant Torque VFD

I have a hitachi 2.2 kw = 3 hp from drives warehouse in the us.
about 400 $.

It takes in 110 60 hz or in my case 220 50 hz -
so it will work anywhere in the world.

I am very happy with it.
Its bigger than needed - but will work anywhere and will last much
longer in the hot climates in am and will be in.

To interface with mach,I use a c11 multifunction card from arturo at
cnc4pc.com, about 120 $.
He has very good attention and service, the c11 is a bargain for what
you get.
It produces an analog out that goes to the vfd.

Btw - I believe a 1" hole should be step drilled for accuracy and to
make the bits last.
If starting with a pilot hole, no problems.

My 1.1 hp drill press struggles at 20 mm (4/5") in mild steel with no
pilot hole -
but drills it (smoking and sizzling, blue chips flying)
with a 4-6 mm pilot no problem (and the chips aint blue any more).

Have not tried with the BP - i do under 12 mm end mills.
And I´m not a classically trained machinist.


danieltmedlin wrote:

>
> I need a VFD for my 2hp Bridgeport that6 will work with Mach 3.
>
> I would like to have the torque to drill at least a one inch hole in
> steel at the required speed.
>
> Any recommendations?
>
> Dan
>
> __._,_.__

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