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Messages - DMBGO

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171
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: December 21, 2010, 08:34:09 PM »
That's good new about the tool numbers Wes, I tend to use everything with caution due to my limited CNC experience. I did read through the thread so far and saw Dan's issues, but I always use radius mode, so I may not see that one.
What did Dan mean by his issue with the Z start and end being swapped?

Cheers
Dave

172
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: December 21, 2010, 06:38:17 PM »
Hi, I just found this thread and have downloaded the new wizards. I will give them a try soon. It is great to see some work being done on the lathe side of Mach3.

If you are taking feature requests for the existing wizards, it would be great to have a tool number field in all of the wizards that don't have one already.

The first couple of times that I used the OD groove wizard I managed to attempt a 10mm deep initial cut with my parting tool, with disastrous and fairly expensive results.

I subsequently worked out that I needed to edit the gcode output from the wizard and input the tool number  ie: T103.

Anyway thanks for what you are doing.

Cheers
Dave

173
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 16, 2010, 06:07:25 PM »
I am very confident that nobody on this forum has any relationship with Huanyang whatsoever. As for you annoyance with the ebay reseller and Huanyang, please feel free to take out your frustrations however you want, but we are definitely end users just like you!

174
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 16, 2010, 05:17:29 PM »
Hey,
RadiantHeat, don't yell at us, we are in the same boat as you. We are not the manufacturer / retailer of the VFDs, this is just a forum where people can volunteer to help each other, and share their experiences.

Particularly please don't complain about the modbus plugin, this was written by an end user and generously shared with us for no personal gain.

Personally I appreciate your frustration, but a situation like this is always a possibility when you buy virtually unknown products from an unknown manufacturer, for a substantially lower price than competing well known products.
In future you would be better to do some research before you buy. Google is your friend!

Cheers
Dave

175
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 05, 2010, 09:23:55 PM »
I have not had any of the issues you mention with the plugin. Your errors sound more like an RS485 comms problem, since it doesn't always read the registers on the VFD correctly. It could be an issue with the chip on the VFD, or cabling, or a problem with your RS485 convertor.

Cheers
Dave

176
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 01, 2010, 08:24:34 PM »
If you are unsure about the wiring, get a sparky :)

Cheers
Dave

177
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 01, 2010, 08:14:16 PM »
Yes, I think some are better than others, the one you mentioned is only 6 amps, which may not meet the current requirements of your VFD, try this one
http://cgi.ebay.com.au/EMI-Filter-Variable-speed-AC-drive-/320608802271?pt=AU_Gadgets&hash=item4aa5c615df#ht_500wt_1156

I recently bought 2 similar than these from the states and paid about $40.00 each, so this is a good price, and is designed for an AC drive.

Cheers
Dave

178
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: November 01, 2010, 07:24:41 PM »
Sounds like you need an EMI filter on the incoming power to the VFD, although if the mouse is your only issue, I'd try a different mouse first. A mouse is cheaper. It might just be that you have a poorly shielded mouse!
You can get EMI filters on ebay

Cheers
Dave

179
Finished Plugins for Download / Re: Huanyang VFD controller plugin
« on: October 31, 2010, 06:33:31 PM »
Normal PC serial poprts are RS232 ports, whereas the VFD needs a RS485 port. If you look back through this thread you will see some discussion on various options for converting from RS232 to RS485.
Or, just google or ebay RS485 converter

Cheers
Dave

180
SmoothStepper USB / Re: Smoothstepper problem when spindle is on
« on: October 23, 2010, 03:40:17 AM »
I think I have the answer to this common issue, here is a copy of the rather detailed saga that I posted on the yahoo group.


I think I may have the answer to this, please skip down to the last few paragraphs if you are not interested in why it fails, but would prefer how to fix it.

 

From what I’ve read, Jeff and many others have spent a lot of time solving electrical noise related issues with the smooth stepper. I have just recently gone through a trial and error resolution of this same problem, although perhaps issues were more repeatable?

 

From the day that I received my smooth stepper I could consistently make the SS stop responding by starting my lathe motor, which is on an electrically noisy VFD., so I read up on the forums about the subject and started trying things that others had recommended, in what I hoped was a systematic manner.

 

When I first experienced issues I had the SS just sitting on my electronics workbench, unprotected, about 15 feet from the vfd.

 

The things that I had read about and decided to try were:

 

1/ Mount the smooth stepper and the BOBs into their own chassis, with a separate power supply (other than the PC’s power).

 

2/ Use only shielded cables and connect the shields to the earthed chassis at the controller end away from the lathe.

 

3/ use a separate power supply for the break out boards and power the smooth stepper from the usb cable.

 

4/ Number 3 test reversed.

 

5/ Put the smooth stepper into a separate grounded metal enclosure (powered from PC).

 

6/ Ground the smooth stepper via its grounding jumper and a metal post to the controller chassis.

 

7/ Number 6 test but with the break out boards grounded as well.

 

8/ Isolate the smooth stepper from ground completely using plastic standoff mounts but ground the breakout boards.

 

9/ Number 8 test, but also isolate the BOBs from ground as well.

 

10/ Fit an EMI filter to the input of the VFD.

 

11/ Fit ferrite rings to the cables between the bobs and the smoothstepper.

 

The fact that I made it through all of these tests may give some clue as to the fact that none of these fixed the problem. Occasionally the smooth stepper would continue to function for a few seconds after starting the lathe motor, causing a quick indrawn breath, but it would inevitably stop responding seconds afterwards.

 

I was continually assailed by doubts while carrying out the above experiments, since I had no way of telling if some of the steps were improving things, or making them worse – I could have been trying the fix combined with something else that was stopping the fix from taking effect. I kept thinking that perhaps the answer was a particular combination of the above steps and I tried a fair few combinations.

 

While carrying out my connecting things to ground / isolating from ground experiments, I noticed that when the PC was off, but with the usb cable plugged into both the PC and the smooth stepper and I measured between the shield on the smooth stepper’s usb connector and chassis ground on the controller the meter behaved as if I was measuring across a capacitor (I probably was). If I unplugged the usb cable from the smooth stepper I measured about 7 Meg ohms between the shield and ground. This was with the smooth stepper isolated from ground via plastic standoffs.

 

When I turned on the power to the PC, with the USB cable connected, the smooth stepper’s usb shield was immediately connected to chassis ground on the controller back via the PC, and then through the ground wire in the wall.

 

At this point I had a light bulb moment I had read in other places on the net about VFDs putting EMI spikes back into the ground circuit of the building, and the experiments with isolating the smooth stepper from ground completely were meant to eliminate this as a cause of the lockups, but I didn’t know that the usb shield was being connected to ground via the PC.

 

I had read in a post somewhere where another smooth stepper user had fixed his lockups by swapping USB cables, so I decided to try a few different cables to see what happened. (I have quite a few usb cables around because I work in IT). The very first cable I tried eliminated the problem completely. The smooth stepper went from locking up within 3 seconds every time I started the spindle motor, to not locking up at all. In fact I could even sit the controller chassis on top of the VFD with the smooth stepper inside and start the spindle without it locking up.

 

This all happened about 3 weeks ago since then I haven’t had a single lockup with the smooth stepper. This afternoon I decided to find out what the difference was between the working usb cable and the one that was causing the lockups. I plugged the cables into the PC and measured between the usb signal pins and the shield on the usb cable, the only difference I could find between the two cables was that the one that worked reliably had about 1.4 ohms resistance between the ground pin and the shield, and the one that failed reliably, had only 0.3 ohms resistance (this resistance was being measured back through the PC).

 

I suspect that the cable that was failing may have been the better quality cable. Both cables had no connectivity between the shield and the usb ground pin when the cable was unplugged and the shield had continuity in both of the cables.

 

Any way to end a very long story, I decided to see if I could make the smooth stepper work with the cable that had always failed, so first I tested it again on the smooth stepper and was able to instantaneously cause lockups by starting the spindle. I then put the same cable in the vice and carefully hack sawed through the metal case around the plastic plug on the end of the cable where it plugs into the smooth stepper. I then removed the metal shield from that end of the cable and plugged the plastic part of the connector into the smooth stepper. It worked flawlessly!

 

I even bypassed the line filter on the vfd to reintroduce as much electrical noise as possible, with no problems.

 

I am now quite convinced that this was the cause of my issues, and also I strongly suspect the cause of the same issues that many others have also experienced.

I suspect that a small design change to the smooth stepper would eliminate this lockup problem almost completely. It would be worth while, since otherwise this is a very good product.

 

I hope I haven’t bored the pants off you all with this.

 

 

Regards

David M

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