Re: [Emc-users] Large servo selection

2018-04-12 Thread andy pugh
On 12 April 2018 at 13:27, Todd Zuercher wrote: > If you want to try multiple drive motors, a rack and pinion becomes a very > good option. You can make quite a nice actuator reasonably easily by using a gear on the motor spindle and a round rack running in suitable

Re: [Emc-users] Large servo selection

2018-04-12 Thread Todd Zuercher
<linuxcncro...@gmail.com> Subject: Re: [Emc-users] Large servo selection Hmm. Belting is a pretty interesting idea. Though for my application, the reverse motion of a crank/slider isn't a big negative. I've also been toying with combining a few servos smaller servos to get the work done. I'

Re: [Emc-users] Large servo selection

2018-04-12 Thread Dave Cole
On 4/12/2018 6:09 AM, andy pugh wrote: On 11 April 2018 at 15:30, David Berndt wrote: I'm looking to output about 1000lbf in a linear direction via a crank/slider or ballscrew with peak speed of about 1m/s. Have you considered hydraulics? (Or possibly even pneumatics).

Re: [Emc-users] Large servo selection

2018-04-12 Thread andy pugh
On 11 April 2018 at 15:30, David Berndt wrote: > I'm looking to output about 1000lbf in a linear direction via a crank/slider > or ballscrew with peak speed of about 1m/s. Have you considered hydraulics? (Or possibly even pneumatics). Hydraulics can be pretty quick with a

Re: [Emc-users] Large servo selection

2018-04-12 Thread Gene Heskett
On Thursday 12 April 2018 00:38:11 Jon Elson wrote: > On 04/11/2018 01:01 AM, David Berndt wrote: > > Wondering if anyone had any preference/experience/advise > > to share with single phase capable larger servos. I'm > > looking at an application for a 3 to 5hp motor with a vfd, > > but if I

Re: [Emc-users] Large servo selection

2018-04-12 Thread Gene Heskett
On Wednesday 11 April 2018 21:56:17 Chris Albertson wrote: > If you are willing to design and build your own controller and add an > encoder, a motor from a treadmill could work > But only in one direction. The flywheel/pulley/cooling fan on those I have used is screwed onto the motor shaft, and

Re: [Emc-users] Large servo selection

2018-04-11 Thread Jon Elson
On 04/11/2018 01:01 AM, David Berndt wrote: Wondering if anyone had any preference/experience/advise to share with single phase capable larger servos. I'm looking at an application for a 3 to 5hp motor with a vfd, but if I could just get a servo to fill in that'd be nice. Gear reduction will

Re: [Emc-users] Large servo selection

2018-04-11 Thread David Berndt
Hmm. Belting is a pretty interesting idea. Though for my application, the reverse motion of a crank/slider isn't a big negative. I've also been toying with combining a few servos smaller servos to get the work done. I've got no great idea on that yet mechanically or electrically. But

Re: [Emc-users] Large servo selection

2018-04-11 Thread Dave Cole
Consider using a timing belt drive. Not exactly a timing belt, but a cogged tooth belt.  They make cogged tooth belting specifically for linear actuators. You can buy it several inches wide so 6 hp would not be a problem.   I did a servo drive setup to propel a machine carriage with such a

Re: [Emc-users] Large servo selection

2018-04-11 Thread Chris Albertson
If you are willing to design and build your own controller and add an encoder, a motor from a treadmill could work On Wed, Apr 11, 2018 at 12:08 PM, John Kasunich wrote: > > > On Wed, Apr 11, 2018, at 10:30 AM, David Berndt wrote: > > I'd like this to be reasonably low

Re: [Emc-users] Large servo selection

2018-04-11 Thread Gene Heskett
On Wednesday 11 April 2018 04:32:05 jeremy youngs wrote: > Does it have to be a servo ?? 1800 in lb nema 34 steppers are > inexpensive and your speed needs are not great , it's possible a > stepper and a kelling drive would get you there . But again more input > needed. > Gene , I know of a bunch

Re: [Emc-users] Large servo selection

2018-04-11 Thread John Kasunich
On Wed, Apr 11, 2018, at 10:30 AM, David Berndt wrote: > I'd like this to be reasonably low effort. My biggest concern is single > phase input. Control/response requirements are about as low as it gets. > > I'm looking to output about 1000lbf in a linear direction via a > crank/slider or

Re: [Emc-users] Large servo selection

2018-04-11 Thread John Kasunich
On Wed, Apr 11, 2018, at 3:08 PM, John Kasunich wrote: > > > On Wed, Apr 11, 2018, at 10:30 AM, David Berndt wrote: > > I'm looking to output about 1000lbf in a linear direction via a > > crank/slider or ballscrew > You don't mention the stroke length. Are you moving a few inches in a >

Re: [Emc-users] Large servo selection

2018-04-11 Thread theman whosoldtheworld
In my zone there are a lot of big servo motor manufactorer ( 30-50 hp and more) it work for siemens, snider, and many other big company as I can see that power single phase is for special pourpuse only, and it can be found normally in last page of big general product catalog of big

Re: [Emc-users] Large servo selection

2018-04-11 Thread andy pugh
On 11 April 2018 at 15:40, Ed wrote: > I have to check on a regular VFD to drive it, Toshiba claims to be able to > drive (most) PM motors. The Parker Unidrive is another option, can run induction or PM motors equally well (the clue is in the name). Available to huge power

Re: [Emc-users] Large servo selection

2018-04-11 Thread Ed
On 04/11/2018 08:38 AM, andy pugh wrote: On 11 April 2018 at 14:24, Dave Cole wrote: You can find 3 phase gearbox equipped motors on Ebay that can get you 500 rpm max. Another alternative would be to simply get a slow-speed motor. I have an 8-pole motor on my Rivett

Re: [Emc-users] Large servo selection

2018-04-11 Thread David Berndt
I'd like this to be reasonably low effort. My biggest concern is single phase input. Control/response requirements are about as low as it gets. I'm looking to output about 1000lbf in a linear direction via a crank/slider or ballscrew with peak speed of about 1m/s. So that's a real 5hp of

Re: [Emc-users] Large servo selection

2018-04-11 Thread andy pugh
On 11 April 2018 at 14:24, Dave Cole wrote: > You can find 3 phase gearbox equipped motors on Ebay that can get you 500 > rpm max. Another alternative would be to simply get a slow-speed motor. I have an 8-pole motor on my Rivett lathe. This one here is suggested for

Re: [Emc-users] Large servo selection

2018-04-11 Thread jeremy youngs
Snip On Wed, Apr 11, 2018, 03:59 andy pugh wrote: > > > That doesn't sound right. > > A brushless servo should be able to give rated torque indefinitely at > absolutely zero rpm. > Mine is a brushed baldor motor , I agree a brushless will go all the way to zero . It sounds

Re: [Emc-users] Large servo selection

2018-04-11 Thread Dave Cole
How much time/work do you want to put into this motor/drive setup? There are no really cheap large servo motor solutions unless you stumble into a deal on Ebay or a surplus marketplace. Larger servos generally mean 3 phase inputs.   So that becomes an immediate issue. If you can live with a

Re: [Emc-users] Large servo selection

2018-04-11 Thread andy pugh
On 11 April 2018 at 09:11, jeremy youngs wrote: > The red caps are generally 2-3 k rpm , what response do you need at your > lowest rpm? And what is the lowest rpm. The red caps will give you great > low end torque but will have a threshold below which it will be weak >

Re: [Emc-users] Large servo selection

2018-04-11 Thread jeremy youngs
Does it have to be a servo ?? 1800 in lb nema 34 steppers are inexpensive and your speed needs are not great , it's possible a stepper and a kelling drive would get you there . But again more input needed. Gene , I know of a bunch of 700 ozin SLO-Syn but they are syncronous at 72 rpm, how would

Re: [Emc-users] Large servo selection

2018-04-11 Thread jeremy youngs
Far more information is needed to give you a fitting response. You need to know what your actual torque needs are, even roughly quantified. I've recently purchased several servo motors , due to not having a known torque needed. Your rpm requirement is quite low leaving a vfd 3phase motor wit not

Re: [Emc-users] Large servo selection

2018-04-11 Thread Gene Heskett
On Wednesday 11 April 2018 02:01:07 David Berndt wrote: > Wondering if anyone had any preference/experience/advise to share with > single phase capable larger servos. I'm looking at an application for > a 3 to 5hp motor with a vfd, but if I could just get a servo to fill > in that'd be nice. Gear

Re: [Emc-users] Large servo selection

2018-04-11 Thread John Dammeyer
My plan is to find a 2HP 240VAC 3 phase motor and add an encoder. Then use one of my STMBL AC Servo Drives to run it. I haven't yet decided how I will control the speed from LinuxCNC or BBB Machinekit. So far I've only had experience with my 3 phase Harmonic Drive and the STMBL but it's