Re: [Emc-users] encoder

[anders wallin]

> I have an axis with 50800 counts per inch.
> This gives me the proper amount of travel but in the wrong
> direction- I am only turning the screw by hand
>  When I use a negative 50800 it is correct.  Will this cause
> me any problems or should I flip the A and B around?
changing the sign of INPUT_SCALE in your INI file, or physically 
swapping the A and B wires will change the sign.

AW

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[Emc-users] encoder

[Terry]

Hi



I have an axis with 50800 counts per inch.

This gives me the proper amount of travel but in the wrong 

direction- I am only turning the screw by hand

 When I use a negative 50800 it is correct.  Will this cause

me any problems or should I flip the A and B around?

Thanks
Terry
 Msg sent via CableONE.net MyMail - http://www.cableone.net
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Re: [Emc-users] EMC and brushless motors

[Jon Elson]

Kirk Wallace wrote:
> On Tue, 2008-07-08 at 11:53 -0500, Jon Elson wrote:
> ... snip
> 
>>If the encoders are inscrutable proprietary ones that mix the 
>>index and commutation signals like Yaskawa does, then Renco has 
>>some really nice 2.1" encoders with 6 channels (ABZ and UVW for 
>>commutation signals.)
>>
>>Jon
> 
> 
> Would you happen to have a model number or link for the Renco encoders?
The link is a little long, but the model # is the RCM21, the C 
is for commutation.



I see they now also have an RCML15, a smaller encoder also with 
commutation, and it sells for $68!  Wow!

> How do ABZ  (quadrature with index) differ from UVW? UVW sounds like
> some sort of three phase thingy.
> 

Yes, the UVW are the commutation signals, and tell a siz-step 
drive what polarity to drive on which motor pins.  Most newer 
motors are designed for sinusoidal drive, but some work fine 
with six-step.  The ones that don't work so well have vibrations 
at about 150 RPM.

Yaskawa uses a proprietary 3-channel scheme, where the C channel 
looks just like the A and B channel, but its phase shift from 
those channels tells what sextant of the motor's rotation it is 
in, thereby giving the commutation info in with the index pulse.

Jon

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Re: [Emc-users] OT: Perfboard Wire

[Emory Smith]

I use some Belden control cable left over from a lighting project.
It's 10 or 12 conductors of 24 ga stranded wire.
It doesn't melt near as bad as Cat 5 or phone wire.
You might check with sound and lighting companies around town
to see if they have any scraps.  A 10' piece will last a good while.

Emory

On Tue, Jul 8, 2008 at 3:09 PM, Kirk Wallace
<[EMAIL PROTECTED]> wrote:
> I have been using CAT-5 wire to solder up perfboard circuits, but the
> insulation melts back. Does anyone have a favorite wire for
> perfboarding?
>
> --
> Kirk Wallace (California, USA
> http://www.wallacecompany.com/machine_shop/
> Hardinge HNC/EMC CNC lathe,
> Bridgeport mill conversion, doing XY now,
> Zubal lathe conversion pending
> Craftsman AA 109 restoration
> Shizuoka ST-N/EMC CNC)
>
>
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Re: [Emc-users] pyVCP and AXIS Position

[Chris Radek]

On Tue, Jul 08, 2008 at 12:56:27PM -0700, Kirk Wallace wrote:
> I would like to display the axes positions in larger numbers, and
> possibly with an inch/mm toggle. I made an X position pyVCP element on
> the AXIS display, but it doesn't change with Touch-Off.

AXIS already has an inch/mm display toggle.

To enlarge the font use something like
http://cvs.linuxcnc.org/cgi-bin/cvsweb.cgi/emc2/src/emc/usr_intf/axis/etc/axis_big_dro?rev=1.1
in your X resources.  We've talked about some ideas for a better way
to do this (like on a menu) but nobody has done it yet.


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[Emc-users] OT: Perfboard Wire

[Kirk Wallace]

I have been using CAT-5 wire to solder up perfboard circuits, but the
insulation melts back. Does anyone have a favorite wire for
perfboarding?

-- 
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/ 
Hardinge HNC/EMC CNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversion pending
Craftsman AA 109 restoration
Shizuoka ST-N/EMC CNC)


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[Emc-users] pyVCP and AXIS Position

[Kirk Wallace]

I would like to display the axes positions in larger numbers, and
possibly with an inch/mm toggle. I made an X position pyVCP element on
the AXIS display, but it doesn't change with Touch-Off. Can anyone give
my a head-start on how to make my pyVCP position match AXIS' position
display?

My lathe_postgui.hal has:

net Xpos => pyvcp.Xposition

I suppose Xpos is not the proper signal? Or I need to process it with
Touch-Off some how?

-- 
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/ 
Hardinge HNC/EMC CNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversion pending
Craftsman AA 109 restoration
Shizuoka ST-N/EMC CNC)


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Re: [Emc-users] EMC and brushless motors

[Kirk Wallace]

On Tue, 2008-07-08 at 11:53 -0500, Jon Elson wrote:
... snip
> If the encoders are inscrutable proprietary ones that mix the 
> index and commutation signals like Yaskawa does, then Renco has 
> some really nice 2.1" encoders with 6 channels (ABZ and UVW for 
> commutation signals.)
> 
> Jon

Would you happen to have a model number or link for the Renco encoders?
How do ABZ  (quadrature with index) differ from UVW? UVW sounds like
some sort of three phase thingy.

-- 
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/ 
Hardinge HNC/EMC CNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversion pending
Craftsman AA 109 restoration
Shizuoka ST-N/EMC CNC)


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Re: [Emc-users] EMC and brushless motors

[Jon Elson]

Ed wrote:
> I recently purchased a small HMC with Fanuc control and red cap AC 
> motors. The control and probably servo drive will go on Ebay as I have 
> no docs with the system and it had been partly dismantled. A couple of 
> questions, Does antone know if a VFD will work on a PM 3 phase motor as 
> well as a squirrel cage type?
No, it will NOT work.
  That would make the spindle drive much
> easier. Does anyone make an amp that works well with EMC and can drive 
> an AC servo? Motors specs are: 198V at 7.6A at stall. Jon, will your 
> system work with this? I can change the encoders. Thanks.   Ed.
Maybe.  It depends a lot on the design of the motor windings.
The only way for me to know is to try it.  Especially if you 
don't need the full RPM of the motor, there should be no 
problem.  Assuming 250 IPM is good, and a 5 TPI screw, it only 
needs 1250 RPM.  If it is a 2000 or 3000 RPM motor at the 198 V, 
then I think there is no electrical limit.

If you want to pull one of the motors off and send it to me, I 
can test it on my drives.  First, I have to find out the wiring 
setup to make the encoder work, then I can check it for 
smoothness.  Some motors run quite smoothly with my 6-step drive 
scheme, some don't - they buzz a lot at around 150 RPM.
If the encoders are inscrutable proprietary ones that mix the 
index and commutation signals like Yaskawa does, then Renco has 
some really nice 2.1" encoders with 6 channels (ABZ and UVW for 
commutation signals.)

Jon

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Re: [Emc-users] EMC and brushless motors

[John Kasunich]

Ed wrote:
> I recently purchased a small HMC with Fanuc control and red cap AC 
> motors. The control and probably servo drive will go on Ebay as I have 
> no docs with the system and it had been partly dismantled. A couple of 
> questions, Does antone know if a VFD will work on a PM 3 phase motor as 
> well as a squirrel cage type?

Some VFDs will work with some PM motors, but different control 
algorithms are required.  If the drive maker didn't specifically include 
PM control, it most likely won't work.

> That would make the spindle drive much 
> easier. Does anyone make an amp that works well with EMC and can drive 
> an AC servo? Motors specs are: 198V at 7.6A at stall. Jon, will your 
> system work with this? I can change the encoders. Thanks.   Ed.

If you have AC servo drives already, you _really_ want to search for 
docs, etc, before you give up and ebay them.  AC servos are much more 
complex than DC servos - if you've got drives that are matched to the 
motors, use them.

Regards,

John Kasunich

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[Emc-users] EMC and brushless motors

[Ed]

I recently purchased a small HMC with Fanuc control and red cap AC 
motors. The control and probably servo drive will go on Ebay as I have 
no docs with the system and it had been partly dismantled. A couple of 
questions, Does antone know if a VFD will work on a PM 3 phase motor as 
well as a squirrel cage type? That would make the spindle drive much 
easier. Does anyone make an amp that works well with EMC and can drive 
an AC servo? Motors specs are: 198V at 7.6A at stall. Jon, will your 
system work with this? I can change the encoders. Thanks.   Ed.

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