On Thursday 18 August 2016 22:28:38 Martin Dobbins wrote:
> >Agreed. And I have a saying when it appears that it will work,
> > gopherit. I need to see if I can rewire this 1600 for parallel,
> > which ought to speed it up considerably. But its 22mh per winding,
> > so I don't expect miracles.
>
>Agreed. And I have a saying when it appears that it will work, gopherit.
>I need to see if I can rewire this 1600 for parallel, which ought to
>speed it up considerably. But its 22mh per winding, so I don't expect
>miracles.
>And then tell us how it works when you've lived with it for 2 weeks.
de back of it, and the motor on the front in a good
stout nema 34 bracket. With a 1/1 belt drive, probably. We'll see,
because the closer I can get the screw to the bed, the less swarf it
will have to self wipe off.
>
> Martin
>
>
>
>
>
>
>
> _
he "made in the USA"
idea, the stepper solution is lot less $$.
Martin
From: Gene Heskett <ghesk...@shentel.net>
Sent: Wednesday, August 17, 2016 10:37 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Clearpath Servo For Lat
On Thursday 18 August 2016 04:58:20 andy pugh wrote:
> On 18 August 2016 at 04:37, Gene Heskett wrote:
> > That flat line going to the left
> > to zero speed, is the maximum steady torque over a longer period of
> > time without overheating something.
>
> A typical
On 18 August 2016 at 04:37, Gene Heskett wrote:
> That flat line going to the left
> to zero speed, is the maximum steady torque over a longer period of time
> without overheating something.
A typical threading operation probably doesn't count as "steady state"
except on
On Wednesday 17 August 2016 22:39:46 Martin Dobbins wrote:
> That depends on 2 things, Martin.
> 1. And likely the most important by far, is the coil inductance.
>
> A motor with only 2 millihenry's of inductance can achieve full coil
> currents quick enough to have usable torque at 500 rpms.
That depends on 2 things, Martin.
1. And likely the most important by far, is the coil inductance.
A motor with only 2 millihenry's of inductance can achieve full coil
currents quick enough to have usable torque at 500 rpms. The same motor
frame, wound for the same starting torque but has a 15
On Wednesday 17 August 2016 17:54:46 Martin Dobbins wrote:
> Gene wrote:
> >Looking at the torque curves of the SDSK series, and the steady state
> >available powers, for a spindle drive the steady state limit is the
> >important one, and its much lower than its peak torque while moving
> > to a
>I would be surprised if a stepper of that size makes any torque at all
>at 1500 rpm.
>Is there a performance curve anywhere on t'internet?
What was I typing??? I meant 500 rpm
Martin
I would be surprised if a stepper of that size makes any torque at all
On 17 August 2016 at 22:54, Martin Dobbins wrote:
> It's very difficult (for me, at least) to compare a stepper motor to one of
> these because the torque of a stepper is going to fall off rapidly with
> speed. The stepper used is so huge, however, how much torque will it
Gene wrote:
>Looking at the torque curves of the SDSK series, and the steady state
>available powers, for a spindle drive the steady state limit is the
>important one, and its much lower than its peak torque while moving to a
>fixed position. You have to get large and ex$pen$ive to get steady
On 17 August 2016 at 03:37, Martin Dobbins wrote:
>
> https://www.teknic.com/products/clearpath-brushless-dc-servo-motors/
>
> The trouble is I know nothing about servo driven spindles, would they have
> the same problem with poor torque at low revs that the Sherline DC motor
On Tuesday 16 August 2016 22:37:48 Martin Dobbins wrote:
> Sherline lathe motors are not known for torque at very low speeds,
> which is probably why Sherline sells this piece of kit for cnc
> threading:
>
> http://sherline.com/product/6500-stepper-motor-mounting-kit/
>
> This will work (very
Sherline lathe motors are not known for torque at very low speeds, which is
probably why Sherline sells this piece of kit for cnc threading:
http://sherline.com/product/6500-stepper-motor-mounting-kit/
This will work (very slowly!) for cnc threading if a modest size Nema 23
stepper motor is
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