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Messages - Tweakie.CNC

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7991
FAQs / Re: plug and play with old machine?
« on: August 10, 2010, 02:33:34 AM »
Hi Tom,

Quote
why do you think there are only 4 inputs? There are six pins connected to the circuit board is that not 6 inputs?

The standard PC parallel port consists of inputs and outputs (1-9, 14, 16 & 17 are all output pins 10-13 &15 are all input pins and 18-25 are ground).
So by my reckoning you have pins 1,14,16,17 to control the steppers and pin 11 as a feedback / interlock / etsop / whatever - pin 25 is ground.

The active high / low relates to the circuit design of the driver board and can be found by trial and error if it is not previously known.

Here is a link to a typical driver PCB with some setting up instructions which you might find useful. http://www.cooperman.talktalk.net/MDfly.zip

Tweakie.

7992
FAQs / Re: plug and play with old machine?
« on: August 09, 2010, 02:05:44 AM »
If what is says on the edge of your driver card "3 x 2A 36V" is correct then your existing PSU etc. should be just fine.

As mentioned earlier mach requires two outputs for each axis and your driver seems to only have 4 inputs for all 3 axis (not sure how this works, unless it only moves any one axis at a time).

Tweakie.

7993
Show"N"Tell ( Your Machines) / Re: Dixie Duke - A machine in the making.
« on: August 09, 2010, 01:58:15 AM »
Great work Sam - at this rate it will be making chips in two weeks   ;)

Tweakie.

7994
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 12:37:29 PM »
Hi Tom,

I have done a bit of searching on this but no luck. HME Technology are very cagey with their information but it appears to be a Rishton CNC designed machine. There is more than a good chance that your control board is for Serial operation using the (2) setup of pins 14,16, 17 and a computer installed driver.

If you are unable to get the necessary info from HME (bearing in mind that all suppliers to schools and the educational market are very guarded with their info and software) then the best bet would be to remove the board and fit another cheap 3 axis driver such as this one http://cgi.ebay.co.uk/3-AXIS-TB6560-CNC-DRIVER-BOARD-4-STEPPER-MOTOR-ROUTER-/110570269975?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item19be806d17
There are plenty of these type of boards available on ebay and, in my opinion, they represent an economic solution.

Hope this helps,

Tweakie.

7995
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 11:32:48 AM »
Tom,

From that information I would think this is not designed to connect to the computers parallel port at all but to a, perhaps PCI, driver card fitted in the controlling PC.

Tweakie.

7996
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 08:47:35 AM »
Tom,

Just one point that is very important - do not disconnect any of the motors whilst the board is powered up.

Tweakie.

7997
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 08:11:38 AM »
OK Tom, excellent photos. This looks like it will be an easy one, well at least not very complicated.

A common convention (but there is no defined standard) is;
LPT Port Pin      2   X Step
                       3   X Direction
                       4   Y Step
                       5   Y Direction
                       6   Z Step
                       7   Z Direction

With pins 18-25 as GND or 0 Volts.

This is the very basic and initial connections required to move the motors but there may be an enable signal (e-stop) to be found also.
If it was me, I would connect the cable to your computers printer port and try configuring Mach with the above pin allocations (2 to 7) as trial and error and see what happens. Once you get axis movement then you need to set the steps per and velocity / acceleration etc. for each axis and get the directions right. (the Mach manual and videos will give you more details of this).

The next step is to find the limit / homing switch, e-stop and spindle control pins (2-9, 1[seldom used], 14, 16 & 17 are all output pins driving the machine functions) (10-13 &15 are all input pins connected to e-stop, limits, safety interlocks etc.) (18-25 are ground)

Good luck with the experiments.

Tweakie.

7998
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 06:19:14 AM »
Tom,

I have never seen one of these machines before and their website doesn't give much away either but if the machine is operated by 'step and direction' signals generated by the PC then there is a good chance that it can be used with Mach without too much hassle.

If,on the other hand, the stepper motor pulses are generated by the machines internal controller then there may be quite a lot of work to do.

A photo of the machines internal electronics might help.

Tweakie.

7999
FAQs / Re: plug and play with old machine?
« on: August 07, 2010, 05:57:11 AM »
Hi Tom,

In answer to your questions it is just about a 'no' to all of them.  :'(

There is no easy solution without knowing more information, it may be possible but most solutions with old DOS machines is to replace the internal driver board.

Does the router operate from a 'parallel port' cable (as opposed to serial) ?.
Do you know the type and model of the router ?

Tweakie.

8000
General Mach Discussion / Re: Z stepper movement
« on: August 07, 2010, 01:46:57 AM »
Hi Bernie,

I suggest that your 'steps per' are incorrect. Is there any possibility that you are not saving the axis settings after you are making the changes ?

Tweakie.

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