On Thursday 30 November 2017 23:32:48 Cecil Thomas wrote:
> Gene,
> I guess you could understand why all the talk about gearboxes and 2
> speeds and motors speeding in multiple K revs was confusing me a lot
> when I thought you were talking about the Sheldon.
> How close was my remembrance to abou
Gene,
I guess you could understand why all the talk about gearboxes and 2
speeds and motors speeding in multiple K revs was confusing me a lot
when I thought you were talking about the Sheldon.
How close was my remembrance to about right?
Cecil
At 10:06 PM 11/30/2017, you wrote:
> Are we ta
On Thursday 30 November 2017 22:45:06 Jon Elson wrote:
> On 11/30/2017 12:29 PM, Gene Heskett wrote:
> > 2. and this is for Jon. I have a fixed gain scale setting
> > that prevents the pwm from exceeding a 98% duty cycle. The
> > pwmgen is running at 20 kilkohertz, and when the pid is
> > outputti
On 11/30/2017 12:29 PM, Gene Heskett wrote:
2. and this is for Jon. I have a fixed gain scale setting
that prevents the pwm from exceeding a 98% duty cycle. The
pwmgen is running at 20 kilkohertz, and when the pid is
outputting 46 something it is up against this limit, with
a 1.06 u-sec rechar
On Thursday 30 November 2017 19:40:32 Cecil Thomas wrote:
> Gene,
> If we are talking about the sheldon you got from Tom as I recall, it
> had: (These are very approximate numbers based on an admittedly faulty
> memory)
>
> a) Motor pulley about 4 inches
>
> b) countershaft Pulley (input cone pull
Gene,
If we are talking about the sheldon you got from Tom as I recall, it had:
(These are very approximate numbers based on an admittedly faulty memory)
a) Motor pulley about 4 inches
b) countershaft Pulley (input cone pulley shaft) about 10 inches or so.
so with a "nominal" 3600 rpm motor the
On 30 November 2017 at 21:12, Ed wrote:
> It appears to be 200V and about 7.5KW rated for 6000RPM, I don't know the
> pole count. The encoder sends out A B and Z
How many wires are there between the drive and the motor?
If it is only the 3 power cables then perhaps a VFD would work,
because any
On Thursday 30 November 2017 13:29:05 Gene Heskett wrote:
> On Thursday 30 November 2017 10:27:39 andy pugh wrote:
> > On 30 November 2017 at 14:13, Gene Heskett
>
> wrote:
> > > Yes, and its math I should have explored, but I had no clue that
> > > there was that big a geardown in the head, even
On 11/30/2017 11:37 AM, andy pugh wrote:
On 30 November 2017 at 17:20, Ed wrote:
Is there a VFD that works with a PM motor rather than a squirrel cage type?
Need spindle orientation also, the motor has an encoder.
You need a servo motor driver, really. I would imagine that this is a
synchrono
On Thursday 30 November 2017 10:27:39 andy pugh wrote:
> On 30 November 2017 at 14:13, Gene Heskett
wrote:
> > Yes, and its math I should have explored, but I had no clue that
> > there was that big a geardown in the head, even in high gear, before
> > I ordered that 1000 line encoder. That says
On Thursday 30 November 2017 14:12:11 Chris Albertson wrote:
> I'm Stil not understanding. Gene's math is still not clear.
>
Thats because the a/b signals ARE coming from a 1000 line encoder on the
MOTOR. BUT the index is coming from an encoder on the SPINDLE. IOW, two
different encoders. The i
I'm Stil not understanding. Gene's math is still not clear.
Is the encoder on the motor or the spindle? If the goal is to do
threading it must be on the spindle or the index pulse is not going to work.
If on the motor then what is the gear ratio?
The trick is to convert FIRST to revolutions p
On Thursday 30 November 2017 12:20:54 Ed wrote:
> I have a small HMC that has a Fanuc PM 3 phase motor and drive to
> drive the spindle.I am trying to get away from the original drive and
> go with newer. This is for a Linuxcnc retro project.
>
> Is there a VFD that works with a PM motor rather th
On Thursday 30 November 2017 10:27:39 andy pugh wrote:
> On 30 November 2017 at 14:13, Gene Heskett
wrote:
> > Yes, and its math I should have explored, but I had no clue that
> > there was that big a geardown in the head, even in high gear, before
> > I ordered that 1000 line encoder. That says
There are more "850" clones on eBay then you can shake a stick at. The
good thing is they seem to use interchangeable replacement parts. Do make
sure this is the case before you buy. Or if yo are really worried buy a
spare heating element from the same seller.
With conventional solder I have a
On 30 November 2017 at 17:20, Ed wrote:
> Is there a VFD that works with a PM motor rather than a squirrel cage type?
> Need spindle orientation also, the motor has an encoder.
You need a servo motor driver, really. I would imagine that this is a
synchronous motor, and VFDs only really work on a
I have a small HMC that has a Fanuc PM 3 phase motor and drive to drive
the spindle.I am trying to get away from the original drive and go with
newer. This is for a Linuxcnc retro project.
Is there a VFD that works with a PM motor rather than a squirrel cage
type? Need spindle orientation also
On 30 November 2017 at 14:13, Gene Heskett wrote:
> Yes, and its math I should have explored, but I had no clue that there
> was that big a geardown in the head, even in high gear, before I ordered
> that 1000 line encoder. That says the motor, running wide open, is
> turning about 20 k rpms.
Th
On Thursday 30 November 2017 09:30:20 Peter C. Wallace wrote:
> On Thu, 30 Nov 2017, Gene Heskett wrote:
> > Date: Thu, 30 Nov 2017 09:16:16 -0500
> > From: Gene Heskett
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users]
On Thursday 30 November 2017 08:54:57 Peter C. Wallace wrote:
> On Wed, 29 Nov 2017, Gene Heskett wrote:
> > Date: Wed, 29 Nov 2017 23:41:51 -0500
> > From: Gene Heskett
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users]
On Thu, 30 Nov 2017, Gene Heskett wrote:
Date: Thu, 30 Nov 2017 09:16:16 -0500
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] omron encoders
On Thursday 30 November 2017 06:19:58 Les Newell wrote:
Ok, I looke
On Thursday 30 November 2017 06:19:58 Les Newell wrote:
> Ok, I looked trough your previous posts. It appears that you are
> getting 7161.17 counts per spindle revolution. Your max frequency in
> that case is (7161.17 * 3000) / 60 = 358058.5Hz. 358kHz is well within
> the range of the 5i25.
>
> Wh
On Thursday 30 November 2017 05:14:07 Les Newell wrote:
> Hi Gene,
>
> Are you sure your maths is correct?
>
> > 1000*7161.17=761,170 line/rev
>
> So your drive ratio is 7161.17:1? At 3000rpm your encoder will be
> spinning at 3000*7161.17. That's over 21 million RPM!
>
> Les
Yes, and its math I
On Wed, 29 Nov 2017, Gene Heskett wrote:
Date: Wed, 29 Nov 2017 23:41:51 -0500
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] omron encoders
On Wednesday 29 November 2017 22:42:11 Chris Albertson wrote:
So th
Ok, I looked trough your previous posts. It appears that you are getting
7161.17 counts per spindle revolution. Your max frequency in that case
is (7161.17 * 3000) / 60 = 358058.5Hz. 358kHz is well within the range
of the 5i25.
What is your encoder filter set to?
Les
On 30/11/2017 04:41, Ge
Hi Gene,
Are you sure your maths is correct?
1000*7161.17=761,170 line/rev
So your drive ratio is 7161.17:1? At 3000rpm your encoder will be
spinning at 3000*7161.17. That's over 21 million RPM!
Les
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