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Thread: DIY CNC plasma table build - Forcecut 42i

  1. #21
    Senior Member 65falcon's Avatar
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    Also, on the mini plug connection to the THC from the plasma...the tip is + and the ring portion is -. It does not say this anywhere that I could find on the CandCNC documentation but they told me so in an email response. The divided output pins for + and - are identified on the 42i pin-out page of the manual. This is important to know if you cut the end off the cable and splice like I did.

    PW
    Custom 2x4 CNC plasma table - www.hotrodfab.com
    Hypertherm Powermax 45 Plasma
    TA 211i with TIG torch/Pedal and spoolgun
    MK Morse Metal Devil 14" saw
    12" disc sander
    1961 Buffalo forge no.15 Floor standing drillpress
    My brain - a fairly useful tool on occasion..

  2. #22
    the 42i should be ok as far as the divided arc voltage goes.. Its a modern machine...
    Last edited by brucer; 10-14-2013 at 09:59 AM.
    _____________________________

    1972 Bridgeport Mill
    Thermal Arc 211i
    Thermal Dynamics Cutmaster 52
    Buffalo 4x6 Horizontal Band Saw
    Craftsman Benchtop Drillpress
    Craftsman Bench Grinder
    Craftsman Belt/Disk Sander Combo
    Crafstman Vertical Band Saw
    _____________________________

  3. #23
    Senior Member 65falcon's Avatar
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    I checked the voltage divider in the unit to make sure it was set at 20/1 and..... it was.


    Kind of a dark and crappy cell phone pic but you can see the 4 dip switches - I unplugged a couple of wires so you can see better. This card is roughly located behind the settings panel on the front/top of the machine.

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    The voltage at the cnc port pin out (while cutting a 1/4" piece of steel) was reading right around 6 volts...so 6 x 20 = 120v at the tip which is probably quite close from what I have read. So I think technically everything is now connected except for the X,Y and Z limit switches. I will pick some up tomorrow after work.

    Once those are wired in I think I am ready to start actually trying to use the table!
    Custom 2x4 CNC plasma table - www.hotrodfab.com
    Hypertherm Powermax 45 Plasma
    TA 211i with TIG torch/Pedal and spoolgun
    MK Morse Metal Devil 14" saw
    12" disc sander
    1961 Buffalo forge no.15 Floor standing drillpress
    My brain - a fairly useful tool on occasion..

  4. #24
    I used Hall effect transistors for my limit switches. Mechanical switches kept false tripping. You might want to look into them, cheap too.
    Units owned Longevity PROmts 200

    Force Cut LP80 plasma cutter
    Longevity auto dark welding helmet

    Atlas 10x36" lathe
    Craftsman 5HP 30 Gal compressor
    Home made CNC router/plasma/hot wire foam cutting, 3D printing table powered by Longevity Force Cut LP80
    Home built aluminum foundry, HF 4x6 bandsaw

  5. #25
    Senior Member 65falcon's Avatar
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    getting close...

    Well I have not had much time to spend on the CNC the last couple days but i did manage to get a few things done.

    I got some small limit switches for the X, Y and Z limits and for homing.
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    I was able to get the torch to fire through Mach3 which is great.

    I loaded Sheetcam onto my other computer and started to read some of the manual and watch some basic tutorial videos I got from acourtjester (thanks Tom).

    Tonight and this weekend I will try and cut something from a file.
    Custom 2x4 CNC plasma table - www.hotrodfab.com
    Hypertherm Powermax 45 Plasma
    TA 211i with TIG torch/Pedal and spoolgun
    MK Morse Metal Devil 14" saw
    12" disc sander
    1961 Buffalo forge no.15 Floor standing drillpress
    My brain - a fairly useful tool on occasion..

  6. #26
    YOur welcome Getting close with my table too.
    Miller Mig
    Everlast Tig/plasma
    HyperTherm PowerMax 65 & Machine torch
    DIY CNC table for plasma/routing CandCNC DTHC-IV Electronics
    metal lathe
    small milling machine
    Powder coating oven
    2 bead rollers
    small shop
    ect, ect

  7. #27
    Senior Member 65falcon's Avatar
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    1st cuts!

    Got the first cuts off the machine this morning! Still quite a bit of messing around with the settings required to get a better cut...but it did actually cut from a drawing which is a good milestone.

    Not very clean from the back. I suspect it has to do with the cut height of the torch and possibly speed of cut?
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    Cuts in order from 1st to 3rd - for some reason it did not cut the 2nd ones ear? and first one was obviously cleaned up after cutting..
    Name:  cnc38.jpg
Views: 12
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    Custom 2x4 CNC plasma table - www.hotrodfab.com
    Hypertherm Powermax 45 Plasma
    TA 211i with TIG torch/Pedal and spoolgun
    MK Morse Metal Devil 14" saw
    12" disc sander
    1961 Buffalo forge no.15 Floor standing drillpress
    My brain - a fairly useful tool on occasion..

  8. #28
    well conrats little fine tuning and you there. Let the fun begin!!
    Miller Mig
    Everlast Tig/plasma
    HyperTherm PowerMax 65 & Machine torch
    DIY CNC table for plasma/routing CandCNC DTHC-IV Electronics
    metal lathe
    small milling machine
    Powder coating oven
    2 bead rollers
    small shop
    ect, ect

  9. #29
    Congrats on the initial run..


    the material your cutting is pretty thin.. what kind of feed rate are you running? you should be running pretty fast, I would guess at minimum of 80ipm, maybe try 100ipm to start with.

    most definitely get your standard thickness of materials together and start you a log book (cut speed chart), and start testing... I would try to get 1/8", 3/16", 1/4" 3/8", and any sheetmetal you might want to cut..

    The thermal dynamics cutmaster52 manual has some charts rated at 40amp with unshielded consumables, that might be a good place for you to start for feed rates.
    _____________________________

    1972 Bridgeport Mill
    Thermal Arc 211i
    Thermal Dynamics Cutmaster 52
    Buffalo 4x6 Horizontal Band Saw
    Craftsman Benchtop Drillpress
    Craftsman Bench Grinder
    Craftsman Belt/Disk Sander Combo
    Crafstman Vertical Band Saw
    _____________________________

  10. #30
    Great looking first cuts. Looks like you can increase your feed speed which should cut down on the dross. Run it as fast as you can and still keep it a full thickness cut. Too fast and you will just cut channels in the material. A good log book of settings and possibly photo results will pay dividends.
    Units owned Longevity PROmts 200

    Force Cut LP80 plasma cutter
    Longevity auto dark welding helmet

    Atlas 10x36" lathe
    Craftsman 5HP 30 Gal compressor
    Home made CNC router/plasma/hot wire foam cutting, 3D printing table powered by Longevity Force Cut LP80
    Home built aluminum foundry, HF 4x6 bandsaw

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