Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: MojsterMiha on October 13, 2007, 02:59:07 PM
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Hi
Is there any solution to controll feed rate through parellel port?
Regards!
Andrej
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You should be able to set up a button and use a brain to activate the feed override when it sees that buttons input. In fact I will probably try this out in the next few days as I want an external override for my Lathe. I will probably end up getting an analogue input card for my PLC so that I can use a pot but for now the buttons will do.
Hood
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Hi,
I set two inputs to activate Triggers OEM code 108 and 109 and that works but ther is a problem because I can set FRO from 1 - 10
in division 1 and from 10 to 250 in division 10. I would like division 1 from 1 to 250, even better from 0 to 250 so I can stop moving.
Second problem is that by restart MACH3 set FRO on 100% even if I left external button on diffrent value - position by shut down.
I still prefer analog variant where I can set FRO on each value between 0 and 250.
Is there any possibility to control FRO with PWM input or pulses with changeable frequency?
Sorry for my very bad English!
Regards!
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There is a setting in general config page to keep the feedrate override persistant, ie if you shut down at 10% it will start up again at 10%.
Dont know if you will be able to overcome the 10% jump, maybe someone else can chime in here.
As for your English, its probably better than mine and most others on the forum so nothing to apologise for :)
Hood
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Whos English is you talking about Hood? ;D
Brett
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its certainly not yours because you only speak and write redneck ;)
Hood
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;D
Brett
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I havn't done this yet but you should be able to have up/down with two input pins, some vb running a timer and countdown or count up of the fro.
I have an analogue through modbus, which I think is the better way to do it, and save some input pins on the lpt port.
If there is enough demand for just a modbus feedrate device, I could manufacture it. It would cost much less than a complete modbus system.
Whacko for $
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Hi,
How much will cost this modbus?
And how much will cost a complete modbus system?
I´m interested in for a complete modbus system but I don`t know where in
Europa I can get one of them which will work with Mach3.
I want to build four axes CNC mill with servos with Pixie100, ATC, and other addition but for
that I need more I/O and also analog input.
Now I planing to solve this with two LPT ports but modbus is surely better solution.
Regards!
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Your best bet is to probably go for a PLC, the one most people use with Mach seems to be the DL06 from Automation Direct. I got mine in the UK from Lamonde Automation and depending on where you are in Europe there will probably be a stockist that you can get one from. You will also need the programming cable and an adapter so that once programmed you can use the same cable to connect the PLC to the computer. If you are needing analogue inputs then you will also need a F0-04AD-2 , this is a 4 channel 0-5/0-10v module. Prices are expensive in the UK compared to the USA but you may not get ripped off so much in your country ;)
Hood
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Do you need to change the fro on the fly? If not you can type in the feedrate on the MDI page. Or just drag the slider. Disregard this if you need a pendant type of feed control. Then a modbus is the best way to go. Check the links page. HOMANN does a nifty modbus. I can do a simple feedrate only using a small pincount PIC MICRO. If you have access to programmer for PIC MiCRO's, let me know. If not, I can burn a chip, send it as a kit. That's the cheapest way.
Whacko
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Hi,
this all about modbus and feed-/speed-override is very complex to me and i don't find pages where it's explained ...
can anyone gimme some help to use a modbus device and attached potentiometers for overrides ?
frank