Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to the one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down.? That is 280lbs that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring to try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter weight that move up? and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to reduce the pendulum movement of the counter mass.? I took what ever material I had in the workshop,an old driveshaft and some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.??

?

Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to the one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down.? That is 280lbs that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring to try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter weight that move up? and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to reduce the pendulum movement of the counter mass.? I took what ever material I had in the workshop,an old driveshaft and some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.??

how do ya like that mill ? I was given one , but before I could go get it the pandemic started so it just sits 300+ miles from me

It is a very rigid mill , the slides does have the proper scraping finish. The base is very heavy . So far I am happy with the package.
The first thing that I am replacing is the DC motor and rather fitting an AC motor with a VFD.
I will drive 300 miles for that mill.


---- On Mon, 20 Apr 2020 19:23:55 -0400 mike allen <animal@...> wrote ----
> how do ya like that mill ? I was given one , but before I could go get it the pandemic started so it just sits 300+ miles from me
>
> animal
>
> On 4/20/2020 3:01 PM, Cornelius Wessels wrote:
> Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to the one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down. That is 280lbs that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring to try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter weight that move up and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to reduce the pendulum movement of the counter mass. I took what ever material I had in the workshop,an old driveshaft and some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.
>
>

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Cornelius Wessels
Sent: April-20-20 4:43 PM
To: digitalhobbyist
Subject: Re: [digitalhobbyist] Knee mill

It is a very rigid mill , the slides does have the proper scraping finish. The base is very heavy . So far I am happy with the package.
The first thing that I am replacing is the DC motor and rather fitting an AC motor with a VFD.
I will drive 300 miles for that mill.


---- On Mon, 20 Apr 2020 19:23:55 -0400 mike allen <animal@...> wrote ----
> how do ya like that mill ? I was given one , but before I could go get it the pandemic started so it just sits 300+ miles
from me
>
> animal
>
> On 4/20/2020 3:01 PM, Cornelius Wessels wrote:
> Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to the
one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down. That is 280lbs
that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring to
try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter
weight that move up and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to
reduce the pendulum movement of the counter mass. I took what ever material I had in the workshop,an old driveshaft and
some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.
>
>

I'm replacing the 2HP single phase 1.5kW motor with this 1.8kW AC Servo. Currently run with a little module changing PWM to 0V-10V along with a direction signal it will also take step/dir for tight control over tapping.

Just need to finishing building the casting cope and drag for the bigger mounting plate and get off my rear side and cast and machine it. The motor sitting there aleady runs under the CNC commands even though I'm still using the single phase motor.

John

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Cornelius Wessels
Sent: April-20-20 4:43 PM
To: digitalhobbyist
Subject: Re: [digitalhobbyist] Knee mill

It is a very rigid mill , the slides does have the proper scraping finish. The base is very heavy . So far I am happy with the package.
The first thing that I am replacing is the DC motor and rather fitting an AC motor with a VFD.
I will drive 300 miles for that mill.


---- On Mon, 20 Apr 2020 19:23:55 -0400 mike allen <animal@...> wrote ----
> how do ya like that mill ? I was given one , but before I could go get it the pandemic started so it just sits 300+ miles
from me
>
> animal
>
> On 4/20/2020 3:01 PM, Cornelius Wessels wrote:
> Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to the
one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down. That is 280lbs
that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring to
try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter
weight that move up and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to
reduce the pendulum movement of the counter mass. I took what ever material I had in the workshop,an old driveshaft and
some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.
>
>

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of mike allen
Sent: April-20-20 5:31 PM
To: [email protected]
Subject: Re: [digitalhobbyist] Knee mill

??? ??? thats a sweet lookin motor , I bet their pretty proud of that &
the controller

??? ??? animal

On 4/20/2020 5:09 PM, John Dammeyer wrote:

I'm replacing the 2HP single phase 1.5kW motor with this 1.8kW AC Servo. Currently run with a little module changing PWM to

0V-10V along with a direction signal it will also take step/dir for tight control over tapping.

Just need to finishing building the casting cope and drag for the bigger mounting plate and get off my rear side and cast and

machine it. The motor sitting there aleady runs under the CNC commands even though I'm still using the single phase motor.

John

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Cornelius Wessels
Sent: April-20-20 4:43 PM
To: digitalhobbyist
Subject: Re: [digitalhobbyist] Knee mill

It is a very rigid mill , the slides does have the proper scraping finish. The base is very heavy . So far I am happy with the

package.

The first thing that I am replacing is the DC motor and rather fitting an AC motor with a VFD.
I will drive 300 miles for that mill.


---- On Mon, 20 Apr 2020 19:23:55 -0400 mike allen <animal@...> wrote ----
> how do ya like that mill ? I was given one , but before I could go get it the pandemic started so it just sits 300+

miles

from me
>
> animal
>
> On 4/20/2020 3:01 PM, Cornelius Wessels wrote:
> Here are pictures of a counter weight I am fitting in my milling machine . I acquired a CNC mill that is similar to

the

one in the picture. For the Z axis movement the entire knee with the x and y axis have to move up and down. That is

280lbs

that the little stepper motor have to lift . The previous owner blew 2 stepper drivers. After the first he did fit a gas spring

to

try and counter act the weight. It was under sized and they loose pressure over time. So I decided to rather fit a counter
weight that move up and down in the column with a cable and 2 pulleys. I will have it running down 2 loose fitting rods to
reduce the pendulum movement of the counter mass. I took what ever material I had in the workshop,an old driveshaft

and

some flanges. It will not be completely balanced but at least I removed 3/4 of the weight.
>
>