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15th June 2009, 12:58 PM #76Senior Member
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Atc
Bit off topic but I've sent an email with a few questions to Derek at HTS LLc about his changer. Biggest issue I see is its ability to properly grip the tool holder. If I'm right on how I see how its done,( ball bearings pressing agains the ramp on the tool holder to draw the taper in) then I can't see how enough upward force is applied to make it really positive grip. That,, and the fact that the centrifigal forces on the balls will lossen this grip at speed, which is the opposite to what you want. I know its over the top but read up about HSD and NC5 holders to see how they deal with the issue. If the design was such that the centrifigal force increased the lockup the fact that the spring is rather weak is not an issue anymore.
Just my $0.02
Cheers
Mark
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15th June 2009 12:58 PM # ADSGoogle Adsense Advertisement
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15th June 2009, 09:47 PM #77
Hi Rosco,
As Greg stated I produce the DigiSpeed DC-06 as well as the DC-3. The only difference between the two is that the DC-06accepts a Step/Dir input. The DC-03 accepts a PWM signal.
They can be found at;
http://homanndesigns.com/store/index...products_id=21
http://homanndesigns.com/store/index...products_id=39
Cheers,
Peter.
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16th June 2009, 11:50 AM #78Intermediate Member
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Thanks Peter for your info. I will definitely considder the 30 when I want to control it by step and direction. It look really good!
For now, my BOB already has a 0-10V output. I am having trouble getting the right voltage out , but I think it is a Mach 3 issue. I guess that my question should have been about Mach3 settings, Sorry if that is off topic.
cheers
rosco
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16th June 2009, 07:46 PM #79
Hi,
Sorry for the delay as I've been interstate on Monday and trying to catch up.
As to the toolchanger, I have similar concerns, but they have been around for quite a while.
I also have the changer made by Paul Kelly. It uses a drawday and a Pneumatic solinoid to release it. It may be a better way to go for high speed spindles.
http://www.cncathome.com/spindles.html
It is a nice spindle. I'll also bring it along to the BBQ.
Cheers,
Peter.
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16th June 2009, 08:09 PM #80Senior Member
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VFD speed control
Hi Guys
I'm still waiting on a USB to RS485 converter to test out modbus comms to the Huanyang VFD so still don't know what I'm getting myself into.
I don't want to play down using a F/V converter board to control the speed thru the 0-10vdc analog input but what are the advantages of doing it this way? Is the voltage latched on the BOB or does Mach have to send pulses continually? Noise immunity issues?
Like I said I have yet to dig into the complexities of using Modbus control but am curious what the advantages are to doing it the other away.
Cheers
Mark
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21st June 2009, 08:33 AM #81Intermediate Member
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mhasting2004,
I just got around to opening up my VFD which is made for the 2.2kW spindle, and it has the same missing components.
Hope this helps some way.
cheers
rosco
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21st June 2009, 10:05 AM #82Senior Member
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missing bits
Thanks Rosco
I hadn't got a reply back from Chai yet. I guess it might be a model thing with the same board being used for different models. Bit strange though as having a braking resistor for a 2.2kw motor isn't unreasonable. If I can get the info on whatthe components should be. then its an easy fix.
I've posted over on the zone. But basically, I've started testing talking via a usb to RS485 converter to teh VFD so i can control its speed and get info like motor current which is indicative of the load.
struggling to get the CRC calculation right at the moment.
Cheers
Mark
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21st June 2009, 01:09 PM #83Intermediate Member
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Looking forward to it!
cheers
rosco
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21st June 2009, 01:16 PM #84Senior Member
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serial comms to VFD
Hi Guys
Just found an excel spread sheet that calculates the CRC I'm using this while my mate sorts out his VB.... maybe he's drinking it rather than scripting it!
You will also need a serial port monitor s/w like this one from AGGsoft
Cheers
Looks like I can't attatch excel files so do a search for simply modbus site (.ca) and read the "what is CRC" you'll find a link to the file.
BTW you need to change the C6 cell to text to allow leading zero's
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21st June 2009, 06:48 PM #85New Member
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Dont like VB
Mark,
You should know that i dont like VB. I thought i better get on here and keep and eye on you.
The CRC checking is working. Just need to come and see you on Tuesday to play heaps. Hope you are going to do the BBQ lunch
So if anyone else is interested in talking to there VFD via the serial port, what sort of things would you like to do in particular. As you can make soemthing that is very technical to use and does everything. Or we can make it limited and easy to use. Just want some feedback for what others would see as a benefit.
Oh and hi all my name is Wayne, I work with Mr Hastings
Later
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21st June 2009, 08:24 PM #86
Welcome aboard Wayne,
I suspect most of us here, without doing a lot of research and reading, wouldn't know what can be done.
So, if I can have a say, lets have it all, but I know that this takes time and is probably not an efficient means of deriving a solution.
Can you maybe educate the forum on what could be done in a reasonable time and maybe we can call this the yardstick. Then maybe a few extra requirements could be added, but as time allows and maybe necessity.
Not sure if this suites people and you guys in particular
Side Note: Rod is building a control panel and through reading his very useful output I have concluded that the Modbus I/O that is sold by Peter H can be coupled to the DC-06 which I have just purchased.
I'm not entirely sure how you were going to connect to the ModIO input on the VFD, but is it going to be along the lines of what i just said? The only diif I see between your setup is that your going to run out of a USB port on the PC instead of the serial connection directly (For what ever reason).
In my case I was actually thinking of using the 2nd port on my smooth stepper. Same diff I expect.
Clarification of my ramblings may be in order as I am prone to crapping on the wrong toilet!
/M
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21st June 2009, 09:40 PM #87GOLD MEMBER
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Hi Mike,
I agree with what you said. Having no idea of what they can do makes it hard to give some parameters.
I am laughing at your final quote and must congratulate you on at least reaching a toilet - only joking of course.
Hi Wayne
Welcome aboard and your help in this project is most appreciated.Cheers,
Rod
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22nd June 2009, 09:07 AM #88Senior Member
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Hi Guys
I'll clarify a bit. What we are doing is talking directly to the Huanyang VFD (no BOB or analog card or PLC etc) and setting parameters as if you were doing it on the front panel.
I am using a USB to RS485 adapter as I don't have any serial ports on my laptop and this also gives a measure of isolation between it and the VFD.
What Wayne was asking was how much stuff would you want to set via the serial port using this test app. The current test app lets you type in the hex codes for address, func, length and data then appends the calculated CRC prior to sending to the port address of your choosing. At the moment it is hard coded to 9600 baud and 8n1 protocol.
He is making it a bit fancier right now such that you have a start/stop button and a set speed, display value (ie actual current drawn by motor) windows so you don't need to know the hex for these.
My list of things I want to test is just this
on/off
set speed
increase/decrease speed
display current/voltage/speed
All other parameters I choose to set via the control panel as normal. For example I can't see the point in changing the line voltage or motor rating settings via an app (could be dangerous if done incorrectly)
Again to clarify this is a testing app not something that runs within Mach3. You will still need to write VB scripts, brains etc and assign them to DRO's and LED's within Mach3. Everyone has their own preferance on how they setup screens so that is outside the scope of what Wayne is doing right now.
Jayson posted most of these commands in HEX over on the EMC users forum (google Huanyang modbus)
http://www.mail-archive.com/emc-user.../msg14091.html
Cheers
Mark
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22nd June 2009, 03:32 PM #89New Member
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No Idea
Hey,
Just so you all know. I have no idea of all these things you are talking about.
I know what a CNC is and like watching the you tube vids on them as well.
I do have components here to make a CNC myself, a very small one, all i need is a frame to hold it all together. The scalextric and PC games and other hobbies get in the way thou. GT Legends (car game) on the PC rocks
OK The software as Mark said is a Straight PC via serial Port comms with The VFD. Mark asked me to help out as he wants to talk directly from Mach to the VFD via the comms line, so we are writing this app to get all the routines to talk sorted out before we then place the code into scripts in buttons directly in Mach. Mark and i have both work on this app and we are happy to let anyone else use it if they desire afterwards. The app is a useful tool by itself, but is only the stepping point before placing scripts into Mach for Mark.
Correct me if im wrong there Mark
So I have the current planned, as i can see some value in making it sort of stand alone so no Mach stuff gets in the way. Like when you have a Spindle problem you are trying to debug.
App description
Basic Screen - Here you have a stop and start button for the spindle and a faster and slower button. The screen will show the Speed of the spindle and the current Amps its using so you can see the load blah blah blah.
Advanced screen - here you can enter the data values of any of the parameters in the VFD you like, and i mean any of them.
Monitor screen - Mark thought it useful to have something that monitors the port traffic so we can make sure the 1 we are sending what we think adn 2 that the vfd is replying to us.
Configuration screen - Comm port setting etc, maybe min and max motor speeds. whatever global parameters that need setting.
Tomorow I will be attending Mark's house to do some work on the scripts inside of Mach, and as soon as i post this im going to finish the app for tomorow.
So i guess if your interested than say something otherwise
Wayne
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22nd June 2009, 05:24 PM #90
Would you not want to have a direction change function too?
I have a few tools that are CCW.
I think you have covered everything else needed.
Thanks for the project clarification.I see what your trying to achieve now.
Edit: Maybe a place holder for an initial start speed would be great. When you start these units they seem to start at the lowest speed and you have to enter up/down, etc or an M3?? i think command to set the speed.
/M
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