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Type: Posts; User: BillTodd

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  1. Replies
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    Re: proto trak lcd upgrade

    hi hdokes,

    I have played with 'prototrak' equiped lathe ( not sure of model) but only to fix minor connection problems in the control box (if i recall correctly, the pc part slides out one end of...
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    Re: proto trak lcd upgrade

    sorry, i didn't take any pictures.

    Have a look at your controller board (it will be some kind of pc) , see if it has a spare pci slot or, like my other trak edge machine, an onboard vga output...
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    Re: proto trak lcd upgrade

    I've just fitted a pci vga card and 8" lcd monitor to my brother's AGE 3 machine . Nice to see age 3 is in full colour !

    The ebay monitor waseasy enough to mount in place of the crt and runs...
  4. Re: Wishbone stabiliser for round post drill/mill

    D.L. I'd like to see that :-)

    Bill
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    Re: Remote stop / go switch SWI cnc

    Just to provide a bit of useful info (not much SWI info in the web)

    I have the Quill dro working now. The default settings are pretty accurate using an Easson 5um glass scale. There is a...
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    Re: Remote stop / go switch SWI cnc

    Thanks ATscuba .

    I took the cover off the encoder end of the motor and traced the wires of the X axis (I assume the same pins will be used for all axes) .

    I'll report back if all works as...
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    Re: Remote stop / go switch SWI cnc

    Sorry to dig up an old topic, but do you have the pin numbering for the stop/go switch?

    (I'm also looking for the pinout of the 14pin SWiI Q input (Z scale) if anyone has it)

    TIA

    Bill
  8. Re: Proto Trak MX3 LinuxCNC/Mach3 Conversion -Selecting interface boards/Connections

    Did you get anywhere with your conversion?

    I've just acquired a prototrak edge (2D) machine and have been thinking along similar line as you :-)

    BTW have you figured out the pinouts for...
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    Re: proto trak lcd upgrade

    The older prototrak machines us a MDA or CGA monitor which is not usually compatible with VGA monitors. However, the full size PC mother board will take a standard ISA VGA card

    The software...
  10. Thread: PIC based DRO

    by BillTodd
    Replies
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    33,863

    Re: PIC based DRO

    Hi All

    Anyone wishing to build this project should bare in mind that I designed this some years ago for use with the 1.5V (positive frame) callipers that were around at the time. Modern callipers...
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    Re: DRO Design discrepancies.

    Hi

    Attached are the only schematic and pcb layout that I have of the DRO. You should bare in mind that I designed this some years ago for use with the 1.5V (positive frame) callipers that were...
  12. Re: CVT - Continuously variable drive for RF30 type Drill/Mill

    Many lathes (including my Hardinge see https://www.youtube.com/watch?v=vaFWNz3fUGE) use reeve's drives.They tend to be limited to below 10hp.

    Bill
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    Acceptable for what? Cable stretch and sag...

    Acceptable for what?

    Cable stretch and sag will be no worse that that found in belt and chain drives

    The major drawback with cable is usually resonance (like a guitar string) . Belts and chains...
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    I don't think you've understood the differential...

    I don't think you've understood the differential drive system above. :)

    From what i can see of it, the Belsaw uses a standard winch arrangement with a variable speed (variable slip) belt drive.
    ...
  15. Hi Rob, I used a Doga DC Gear Motor (24V...

    Hi Rob,

    I used a Doga DC Gear Motor (24V 120W 25rpm 15Nm ) left over from another project - very nice motor, but bloody expensive to buy new. A big vehicle wiper motor might do the job . I...
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    The cable are tensioned by a 'tensioner adjuster...

    The cable are tensioned by a 'tensioner adjuster pin' item 14 - so obtaining a fixed pre-load.

    It's now really suitable for long axes (You'd need a lot of cable), but for short low-friction...
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    Interesting Cable drive patent

    Came across this while browsing patents:

    Rotary to linear transmission

    The clever thing here, is the way it uses a differential drive that allows large cable drums (for traction and maximum...
  18. Very neat :) What sort of step rate can the...

    Very neat :)

    What sort of step rate can the interface deliver?

    Bill
  19. The carriage and/or the cross-slide are driven by...

    The carriage and/or the cross-slide are driven by the power feed motor (mounted on the front of the carriage) and are engaged via two clutch levers on the apron (up is engaged - down is free).
    ...
  20. Looks interesting :) Please keep us posted...

    Looks interesting :)

    Please keep us posted with your progress.

    Bill
  21. Thread: PC Base DRO

    by BillTodd
    Replies
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    My thoughts only but ... Steppers either have...

    My thoughts only but ...

    Steppers either have enough power to get the job done, or they don't. If they are losing steps then adding extra ones seems a bit of a bodge (I suppose if speed is not...
  22. Thread: PC Base DRO

    by BillTodd
    Replies
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    You seem to be confusing two different things: ...

    You seem to be confusing two different things:

    1 - displaying the position - for example a DRO
    Here the axis is moved (usually manually), the DRO counts the pulses from the scale and a display...
  23. Thread: PC Base DRO

    by BillTodd
    Replies
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    7,473

    Sounds like you could do what you want with a...

    Sounds like you could do what you want with a classic PID (Proportional , Integral, Derivative) controller, programmed into the PIC or PC.

    Your 10mm/s is only 10,000 pulses per second even at 1...
  24. Thread: PC Base DRO

    by BillTodd
    Replies
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    7,473

    It is still not clear in my mind what you are...

    It is still not clear in my mind what you are trying to do; Are you trying to capture positional data on the move (for a servo system, for instance) or are you digitising (locating the position of...
  25. Thread: PC Base DRO

    by BillTodd
    Replies
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    7,473

    Which scales do you have (or intend to buy)? -...

    Which scales do you have (or intend to buy)? - the document describes three types PPL TTL and HTL which have different power and output voltages.

    If the cable run is short <2m then you could...
  26. Thread: PC Base DRO

    by BillTodd
    Replies
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    7,473

    What's wrong with their pc interface? Welcome...

    What's wrong with their pc interface?

    Welcome To Innovative
  27. Thread: PIC based DRO

    by BillTodd
    Replies
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    33,863

    I'm afraid I don't have the time to work on this...

    I'm afraid I don't have the time to work on this ATM I doubt the little PICs I'm currently using would be able to keep up with the scales (and hence lose counts) but it could be done fairly easily...
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    Good to see some progress :) It looks great ...

    Good to see some progress :)

    It looks great :)

    It'll be interesting to see how well your design works: It looks to me only one roller is taking the cutting force in each direction (Roller nut...
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    A little bit of friction that will act like a...

    A little bit of friction that will act like a damper , reducing vibration in the belt, may not be such a bad thing.

    Bill
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    I've no direct experience but... Is the...

    I've no direct experience but...

    Is the problem area at a consistent diameter ? if so I'd suspect linear guide way. (e.g. contamination)

    If the problem areas are spaced at similar distances, is...
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