## Home Position

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• Hello group, I almost have my machine up and running, but I have two questions for now. 1. Where is the home position located (physical) on the machine? ex. X
Message 1 of 4 , Jul 6, 2008
Hello group,

I almost have my machine up and running, but I have two questions for
now.

1. Where is the home position located (physical) on the machine?

ex. X = all the way back, Y = center in table, Z = all the way to the
top

After I position the table and the Z axis to where I want them, do I
set it up in TurboCNC?

2. I am using a taig mill and was wondering if anyone has a chart
showing which pulley combination results in what RPM the spindle is
running?

Thanks,

Eric
• Well the standard set up is to have the Z be the up/down, the X left /right, and the Y in/out. The home tends to be Z up, Y all the way back and X all the way
Message 2 of 4 , Jul 7, 2008
Well the standard set up is to have the Z be the up/down, the X left
/right, and the Y in/out. The home tends to be Z up, Y all the way back and
X all the way left or right. Mostly the only thing it's for is to set your
software limits, so you can't run slam the axes further then it can move
(that's also what limit switches are for, but at rapid it sometimes takes a
bit to stop). Where you set X=0, Y=0, Z=0 doesn't have to be home. Most of
the time it's where ever on the part or fixture you wish to use as a
referance. Most of the time Z is the top of the work piece and XY is the
center or corner, but that totaly depends on the part you are making and

From: "ecope76" <ecope76@...>
Subject: [turbocnc] Home Position

> 1. Where is the home position located (physical) on the machine?
>
> ex. X = all the way back, Y = center in table, Z = all the way to the
> top
>
> After I position the table and the Z axis to where I want them, do I
> set it up in TurboCNC?
• If we go by the book, and you want all moves to reference from the 0 point in a positive direction on the XY and the negative on the Z, then you will have the
Message 3 of 4 , Jul 7, 2008
If we go by the book, and you want all moves to reference from the 0
point in a positive direction on the XY and the negative on the Z, then
you will have the table all the way to the right (head to the left), and
all the way forward (head to the rear) and the Z all the way up. All XY
moves will then be positive and all Z moves negative from the home position.

Of course, machine home position and vice or jig 0,0,0 can be different
positions. Normally, one will home the machine on startup and then
convert to vice or jig 0,0,0 with either a G92 command or by issuing a
G0X0Y0 command with the vice or jig zero position active (G5x).

I'm not sure of how Turbo handles that exactly because I haven't used it
much. I assume that you set the vice or jig zero point in the setup and
the program takes care of it. You will need to read in the manual to
know for sure.

I have the pulley sheet for the Taig but it may not apply depending on
which motor you have. But it's easy to figure, just measure the grooves
of the pulleys and calculate the ratio (IE: drive pulley is .75 and
driven pulley is 2.5" = 3.33 ratio) for each groove. Multiply the ratio
times the motor speed and you get spindle speed (IE: motor speed 1750 x
3.33 = 5828 spindle RPM). Of course, if the drive pulley is larger then
the ratio is the opposite (IE: drive is 2.5" and driven is .75 = .3
ratio x 1750 RPM = 525 spindle RPM).

Tracy

ecope76 wrote:
> Hello group,
>
> I almost have my machine up and running, but I have two questions for
> now.
>
> 1. Where is the home position located (physical) on the machine?
>
> ex. X = all the way back, Y = center in table, Z = all the way to the
> top
>
> After I position the table and the Z axis to where I want them, do I
> set it up in TurboCNC?
>
> 2. I am using a taig mill and was wondering if anyone has a chart
> showing which pulley combination results in what RPM the spindle is
> running?
>
> Thanks,
>
> Eric
>
>
• Eric: Once your machine is in position, issue one of the following commands: - Setup -- MDI Mode... -- G92 X0 Y0 Z0 - Setup -- Jog Machine... -- Alt+Z
Message 4 of 4 , Jul 7, 2008
Eric:

Once your machine is in position, issue one of the following commands:

- Setup --> MDI Mode... --> G92 X0 Y0 Z0

- Setup --> Jog Machine... --> Alt+Z (zero all axes)

For the sake of terminology, this is usually called the "origin
point" on a CNC machine. You can set it anywhere you want. By
convention, usually Z=0 when the tool touches the top of your part.

"Home position" typically refers to a reference point established by
switches near the end of travel on each axis. This is wherever the
switches are.

Have fun!

Dave Kowalczyk
www.dakeng.com

--- In turbocnc@yahoogroups.com, "ecope76" <ecope76@...> wrote:
>
> Hello group,
>
> I almost have my machine up and running, but I have two questions for
> now.
>
> 1. Where is the home position located (physical) on the machine?
>
> ex. X = all the way back, Y = center in table, Z = all the way to the
> top
>
> After I position the table and the Z axis to where I want them, do I
> set it up in TurboCNC?
>
> 2. I am using a taig mill and was wondering if anyone has a chart
> showing which pulley combination results in what RPM the spindle is
> running?
>
> Thanks,
>
> Eric
>
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