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Messages - DMBGO

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131
General Mach Discussion / Re: CNC Dictionary
« on: December 29, 2011, 07:30:27 PM »
Well it"s good to hear that you like me :)  what do you think of the idea?

Cheers

Dave

132
General Mach Discussion / CNC Dictionary
« on: December 29, 2011, 05:28:49 PM »
 I was thinking of a dictionary that covers the both the unfamiliar CNC terminology and also converts from Chinese English, to Mach3 English.

 I for one could really use something! CNC terms may not be immediately clear to the layperson.
 
I have found it very difficult interpreting the names given to in-outs (that is a new word that I have made up to describe inputs and outputs) on the servo driver that I am trying to wire up.
If such a thing doesn't exist we should make one.

I volunteer to start things off (see attached)

Cheers

Dave (dmbgo)

133
Tangent Corner / Re: X-Mass Gift for my son
« on: December 25, 2011, 05:36:21 PM »
What a bewdy Brian, no wonder you had to employ another programmer!

Hope you had a great Xmas

Dave

134
Tangent Corner / Re: My Blackberry is not working.
« on: December 24, 2011, 03:43:28 AM »
Fortunately we already have all those devices - even an eggs box!
Merry Xmas

Dave

135
General Mach Discussion / Re: Servo Motor question
« on: December 22, 2011, 10:08:46 PM »
I can't remember why I chose the knee mill now, and I don't know why I ordered what from GSK and from Adtech. I appear to have a set of servos and drivers for the lathe from Adtech, as well as most things needed to CNC the mill from GSK including an off the shelf CNC controller! The CNC controller is a GSK 980MDa. I don't know why I bought a dedicated CNC controller, but I am hoping that I can use it to compare mach3 to the "off the shelf" product and depending on the results, keep it, or resell it.
Both GSK and Adtech were very good while I was in hospital and ensured that their stuff found its way into my shed. Even to the extent of calling in favours from other people in this country to pay for things like GST on my behalf, for which I am extremely grateful.

Having forgotten why I purchased what I did, I thought I would start with the lathe, since it has already had a CNC conversion, just using steppers and Gecko drives instead of servos and their propriety drives. So it should be an exercise in memory refreshing to replace the existing steppers for servos. I suspect that I planned to replace the 3phase main motor and VFD with a servo as well (at least I have 3 x servos from Adtech).

I thought I might start by getting one of the Lathe servos running, perhaps on the bench, and getting it under computer control with mach3 and my smoothstepper.

At this point any advice would be gratefully appreciated, as I  think I said earlier in this thread this is my first foray into the world of servos. Add to that my memory loss from the accident and I anticipate that this will be tough, but a good mental exercise.

Have a great Xmas BTW.

136
General Mach Discussion / Re: Servo Motor question
« on: December 08, 2011, 05:18:09 PM »
Well a whole .lot of time has gone by now! I was unfortunate enough to have a very serious car accident on the 31st of march this year, and have spent the last 6 months in rehab, that is after I got out of emergency and then intensive care. The ambulance drivers said it was the worst accident they had seen where the driver lived. Apparently I was unconscious for 6 weeks. Consequently all I had time to do was take delivery of the mill and that's it.
I suffered a brain injury at the same time, so now even though I went through a lot of planning before ordering the mill, I now don't remember anything much.

Oh well looks like it's time to start again.

Cheers

Dave

137
General Mach Discussion / Re: Servo Motor question
« on: March 26, 2011, 07:44:41 PM »
Well a bit of time has gone by and I have made a decision about the VMC-760 machining centre. I decided not to go ahead at the last minute. The supplier was adamant that I use their 3 phase spindle, which would have necessitated buying what they called a variator. Unfortunately, despite numerous e-mails they were unable to give me any clear information as to what a variator was. I assume that it is a phase converter, but whether it's  mechanical or electronic I don't know. To this day I am perplexed. I think they just didn't understand my questions; I would say "I believe a variator is a type of phase converter, could you please tell me if it is a mechanical or solid state device" and they would say something like "The spindle need 3 phase power you need variator to operate it with single phase". We just kept going in circles until I gave up. Once I had given up they sent me this link in an attempt to resurrect the sale but they couldn't tell me what model the one they were quoting was.

http://www.shinhsing.com.tw/index.php?option=com_content&task=view&id=46&Itemid=45

In the end I lost confidence and decided it was too much money to spend, when I didn't really know what I was going to end up with and how expensive and time consuming it was going to be to sort out the inevitable problems. I probably should have just bought the basic machine frame and then sourced the remaining electrical components after it arrived, but by this stage I was worn down and was getting impatient.

One day I will go to Taiwan and China and have a look at the factories over there it should be fascinating.

Having put the import business to bed I turned around and ordered a convention knee mill from a local Melbourne supplier, since I had just sold my existing mill being sure that I was going ahead with the VMC-760.

The mill I have bought is a King Rich KR-V3000, which is set up already for CNC conversion with ground C5 ballscrews on the X and Y and precast brackets for the servos. I just need to supply and fit the motors, put a ballscrew on the quill and do the wiring.
There are a couple of conversion threads on CNCZone for this mill:
http://www.cnczone.com/forums/knee_vertical_mills/117112-conversion_king_rich_3000_a.html
http://www.cnczone.com/forums/knee_vertical_mills/105668-king_rich_krv-2000_knee_mill.html

I had already ordered the 1 kw servos from GSK, after they confirmed that their 1kw servo is fine on 240v single phase, GSK was a bit concerned that I may be under powering the mill, but the guys on CncZone who have converted these mills have used 400watt and 750watt motors in their conversions, so hopefully I will be Ok.

Since I had saved some money by not buying the machining centre I went ahead and ordered some more servos for the lathe as well. I found a single phase 2.5kw one with 2500rpm and a 5000line encoder and drive from Adtech that runs on single phase. I intend to put this on the spindle, and two 500watt servos for the X and Z drives, which should put the lost steps from my steppers to bed.

The mill should arrive in the next week or so so I think I might document the conversion on CncZone, since it seems to be the in thing.

Cheers
Dave


138
General Mach Discussion / Re: Servo Motor question
« on: March 19, 2011, 04:17:43 AM »
here's what they said in the quote:
"2. DA98B-10/110SJT-MZ040D(A2Y2) AC SERVO UNIT (1.0KW、4Nm、2500rpm、5000pps incremental
encoder, 3-phase or single phase AC220V input, short shaft, with brake) for Z axis: 1 SET "

However the DA98B user manual says 240v single phase up to 0.8Kw and 3 phase 1 Kw and over.

I will have to re-clarify this with them, but it does look like the drive will accept either single or 3 phase, there are just some output power limits on single phase.

Thanks for bringing this to my attention

Cheers
Dave



139
General Mach Discussion / Re: Servo Motor question
« on: March 18, 2011, 09:35:52 PM »
Ok, I'll check now thanks for going to the trouble Hood

140
General Mach Discussion / Re: Servo Motor question
« on: March 18, 2011, 07:49:32 PM »
Actually I'm thinking of buying what they call a variator from them as well anyway. Apparently it's a phase converter and it would come in handy from time to time.
I wasn't planning too do this, but I am keen to use the 10,000rpm spindle motor and drive that comes with the mill and that's 3 phase only

Cheers
Dave

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