[Emc-users] cnc lathe retrofit

hey everyone just for your interest here is a cnc lathe I am retrofitting here in NZ link to video on youtube still got a whole lot of work and need to sort out analog servo drive stuff tomorrow but thought I would send a email anyway also what do p

Re: [Emc-users] cnc lathe retrofit

On Saturday 26 December 2020 04:57:38 andrew beck wrote: > hey everyone > > just for your interest here is a cnc lathe I am retrofitting here in > NZ > > link to video on youtube > > still got a whole lot of work and need to sort out analog servo drive

Re: [Emc-users] cnc lathe retrofit

On Sat, 26 Dec 2020 at 10:00, andrew beck wrote: > also what do people do for E stop circuits with analog systems? I have only > used a step direction system before this On my lathe the main servo power supply comes via a contactor with a 24V coil, and that coil power passes through two e-stop

Re: [Emc-users] cnc lathe retrofit

On Saturday 26 December 2020 10:08:47 andy pugh wrote: > On Sat, 26 Dec 2020 at 10:00, andrew beck wrote: > > also what do people do for E stop circuits with analog systems? I > > have only used a step direction system before this > > On my lathe the main servo power supply comes via a contacto

Re: [Emc-users] cnc lathe retrofit

On Saturday 26 December 2020 11:23:20 Gene Heskett wrote: > On Saturday 26 December 2020 10:08:47 andy pugh wrote: [...] > I think we are on about the same page, just need to find the round > tuit. Two additional questions. That 70 ohm 300 watt braking resistor just walked up and rang my doorb

Re: [Emc-users] cnc lathe retrofit

On 12/26/2020 10:47 AM, Gene Heskett wrote: Two additional questions. That 70 ohm 300 watt braking resistor just walked up and rang my doorbell, so are you using one? and if so what settings mods have you made in the VFD? Mine has several settings. There is a minimum frequency, below which it

Re: [Emc-users] Checking vfd hookup question?

I'm sure those could be made to work if they are of an acceptable Ohms range, but how do you mount them? They are just elements. Most braking resistors on larger machines are in cages on the top or side of the control panels. For small drives, they are oftentimes just screwed to the panel backp

[Emc-users] Chinese VFDs with good reputations

What low cost Chinese drives have you guys used with great success? I'm talking mostly single phase input drives. There are a lot of look a likes on Ebay.   Some are dirt cheap. Others not so much. Some specify that they are specifically for water cooled spindles, etc. Others say almost noth

Re: [Emc-users] cnc lathe retrofit

On Sat, 26 Dec 2020 at 16:49, Gene Heskett wrote: > Two additional questions. That 70 ohm 300 watt braking resistor just > walked up and rang my doorbell, so are you using one? I am not using one. It would be useful if I was, since I added on-the-fly gearshifting to the two speed box. The idea

Re: [Emc-users] Chinese VFDs with good reputations

I looked at prices for a 2HP 3phase and a VFD (like Hitatchi Vectorless?) and found without shipping the price was approaching $600. For less than that I ended up with Bergerda. I'm using a Bergerda AC Servo 110SM series (1.8kW, 6NM) on my spindle, currently with a cheap PWM module until I wi

Re: [Emc-users] Chinese VFDs with good reputations

On 12/26/2020 11:44 AM, Dave Cole wrote: What low cost Chinese drives have you guys used with great success? I have a Magnetek (made by Yaskawa) GPD333 on my Bridgeport mill. I think it is designed for single-phase operation. It is a 1 HP drive on a 21 HP motor, so not derated. I do put a

[Emc-users] Making L Type Timing pulleys.

Hi everyone, As I mentioned in a previous posting I'm expecting a Bergerda AC Servo to replace the Stepper motor on the knee of my mill. http://www.autoartisans.com/mill/KneeDrive.jpg The photo shows how the stepper is connected. The L type pulleys were a gift from a friend who salvaged them f

Re: [Emc-users] Making L Type Timing pulleys.

My source for buying belts and pulleys is SPD/SI. On their web site is some tables that will allow you to select the proper size belt. https://sdp-si.com/resources/

Re: [Emc-users] Making L Type Timing pulleys.

On Sat, 26 Dec 2020 at 19:34, John Dammeyer wrote: > Making a new lower pulley with 9 teeth is out of the question. It's too > small for only 9T and definitely won't fit on the 19mm motor shaft. And > that's the kicker. At almost 3/4" the pulley that goes onto it has to be > large enough to

Re: [Emc-users] cnc lathe retrofit

On Saturday 26 December 2020 12:27:29 Jon Elson wrote: > On 12/26/2020 10:47 AM, Gene Heskett wrote: > > Two additional questions. That 70 ohm 300 watt braking > > resistor just walked up and rang my doorbell, so are you > > using one? and if so what settings mods have you made in > > the VFD? > >

Re: [Emc-users] Making L Type Timing pulleys.

I must have missed the designed size. Yes there is a minimum size. You need to have a minimum number of teeth engaged. So even if you have a 13T pulley, if it is very close to a larger pully it would not have enough teeth on the belt. You CAN design a system that works if you move to different

Re: [Emc-users] Checking vfd hookup question?

On Saturday 26 December 2020 12:35:17 Dave Cole wrote: > I'm sure those could be made to work if they are of an acceptable Ohms > range, but how do you mount them? > They are just elements. > Most braking resistors on larger machines are in cages on the top or > side of the control panels. > For s

Re: [Emc-users] cnc lathe retrofit

On Saturday 26 December 2020 13:36:18 andy pugh wrote: > On Sat, 26 Dec 2020 at 16:49, Gene Heskett wrote: > > Two additional questions. That 70 ohm 300 watt braking resistor just > > walked up and rang my doorbell, so are you using one? > > I am not using one. It would be useful if I was, since

Re: [Emc-users] Chinese VFDs with good reputations

On Saturday 26 December 2020 13:48:29 John Dammeyer wrote: > I looked at prices for a 2HP 3phase and a VFD (like Hitatchi > Vectorless?) and found without shipping the price was approaching > $600. For less than that I ended up with Bergerda. > > I'm using a Bergerda AC Servo 110SM series (1.8kW,

Re: [Emc-users] cnc lathe retrofit

On Sat, 26 Dec 2020 at 21:11, Gene Heskett wrote: > No synchros in that gearbox? I'd be getting quotes to replace it with one > that did. It was built in 1916. It's perfect as it is :-) -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mech

Re: [Emc-users] Making L Type Timing pulleys.

On Saturday 26 December 2020 14:55:02 andy pugh wrote: > On Sat, 26 Dec 2020 at 19:34, John Dammeyer wrote: > > Making a new lower pulley with 9 teeth is out of the question. It's > > too small for only 9T and definitely won't fit on the 19mm motor > > shaft. And that's the kicker. At almost

Re: [Emc-users] for PCW

On Friday 25 December 2020 15:27:39 Peter C. Wallace wrote: > On Fri, 25 Dec 2020, Gene Heskett wrote: > > Date: Fri, 25 Dec 2020 15:03:43 -0500 > > From: Gene Heskett > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > To: emc-users@lists.sourceforge.net > > Subject: [Emc-users] for P

Re: [Emc-users] Chinese VFDs with good reputations

I picked up a couple of 220V 1PH to 220V 3PH VFDs, rated for up to 3HP, for under $300 each new. Don't recall the brand and I'm not home where I can go look in the shop. What I find insane is how *simple* electronic phase converters that do nothing but change single to three phase, doing nothing

Re: [Emc-users] for PCW

On Saturday 26 December 2020 18:21:01 Gene Heskett wrote: > On Friday 25 December 2020 15:27:39 Peter C. Wallace wrote: > > On Fri, 25 Dec 2020, Gene Heskett wrote: > > > Date: Fri, 25 Dec 2020 15:03:43 -0500 > > > From: Gene Heskett > > > Reply-To: "Enhanced Machine Controller (EMC)" > > >

[Emc-users] A clarifying post that might help another victum of poor Chinese docs.

On Saturday 26 December 2020 18:54:09 Gene Heskett wrote: A clarifying post for the list archive that might help someone else. After reading several different versions of the manual I've found online, and killing another tree for hard copy BIG enough to read, it becomes obvious that the common