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  1. #561
    Quote Originally Posted by Nickhofen View Post
    As Robert said ,down cut bit, slower feed and............ put self adhesive tape at the side you cut, after the cut remove it and you will have a cleaner cut.
    Good advice this was very old oak I tried a newer bit today didn't tear the same but still not perfect.

    Just bit the bullet and bought a hardware step generator a Mesa 5i25 as my pc's not giving me the performance I can get out the machine.

    https://www.ebay.co.uk/itm/272930377353

    Plugs into the breakout board so no need to rewire which is good ;) I was in Vilnius last year I could have collected it lol.

    This will generate more pulses than I could ever need it expands the BOB connectivity considerably but it's the pulses I can about, it can be linked to encoders for other funky stuff.
    Last edited by Desertboy; 23-02-2018 at 05:38 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  2. #562
    Clive S's Avatar
    Lives in Marple Stockport, United Kingdom. Last Activity: 15 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,333. Received thanks 618 times, giving thanks to others 78 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Plugs into the breakout board so no need to rewire which is good ;)
    What do you mean by this? This will plug into your PC PCI slot but then you will need a bob like a 7i76 if you just use a standard BOB you will still only have 5 inputs and the opto's will no doubt be slow.
    ..Clive
    The more you know, The better you know, How little you know

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  4. #563
    Quote Originally Posted by Clive S View Post
    What do you mean by this? This will plug into your PC PCI slot but then you will need a bob like a 7i76 if you just use a standard BOB you will still only have 5 inputs and the opto's will no doubt be slow.
    https://forum.linuxcnc.org/38-genera...nerator#106403
    Just remember most cheap parallel port breakout boards are not designed to be able to handle the speed potential of hardware step generation. They often have relatively slow optos, not a problem with a slow parallel port, and shouldn't be with an ordinary step motor config (unless your using really high micro stepping and spinning fast). But it can be a problem with high resolution step/dir servos.
    So we shall see I guess I'm only using 8 (maybe 16) microsteps with nema's. Not worried about the other inputs at moment but at some point I will get a daughter board for it and if I find speed is an issue that will be sooner than later lol. I assume I can set the khz within a certain range for each axis? If I can run at 50khz per axis I'll be more than happy for now.

    Am I doing my maths correct?
    8*200 steps *20 (revolutions in 1m) * 2 pulses per step=64000 pulses/metre
    I want 10/min it would be 64000*10=640000khz then divide by 60 == 10666.66 khz per axis

    Good thing about mesa is their upgradability.
    Last edited by Desertboy; 23-02-2018 at 07:17 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  5. #564
    Clive S's Avatar
    Lives in Marple Stockport, United Kingdom. Last Activity: 15 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,333. Received thanks 618 times, giving thanks to others 78 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    This will generate more pulses than I could ever need it expands the BOB connectivity considerably but it's the pulses I can about, it can be linked to encoders for other funky stuff.
    I do read all your post on the other forum as well. But you will need more inputs if you are using encoders and dual homing etc. The beauty of the 7i76 is that you will have differentials output for the step gens and 24v inputs etc.
    ..Clive
    The more you know, The better you know, How little you know

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  7. #565
    Quote Originally Posted by Desertboy View Post
    Am I doing my maths correct?
    8*200 steps *20 (revolutions in 1m) * 2 pulses per step=64000 pulses/metre
    I want 10/min it would be 64000*10=640000khz then divide by 60 == 10666.66 khz per axis
    20 revs = 50mm pitch surely not.??

    Khz = (steps per unit * velocity in units per minute) / 60

    So Break it down into mm units not meters. So lets work on 10mm pitch with 1600 micro steps.

    1600/10=160 steps per mm

    160 x 10,000 mm/min= 1600000 /60 = 26.666Khz

  8. #566
    Quote Originally Posted by JAZZCNC View Post
    20 revs = 50mm pitch surely not.??

    Khz = (steps per unit * velocity in units per minute) / 60

    So Break it down into mm units not meters. So lets work on 10mm pitch with 1600 micro steps.

    1600/10=160 steps per mm

    160 x 10,000 mm/min= 1600000 /60 = 26.666Khz

    LOL that's why I need to check it was having a blonde moment ;)
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  9. #567

  10. #568
    Life is like a box of chocolates, some bastards been in it before you and ate all the good ones leaving you the strawberry creams lol ;)


    Hmmm I have a PS3 pad kicking around wonder if I can get it to work over bluetooth.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  11. #569
    Cool!

  12. #570
    Quote Originally Posted by Nickhofen View Post
    Cool!
    You can do the same thing in Mach 3, not as good as an MPG of course but if you have a pad kicking round better than nothing for free.

    Any linux (Or windows if using Mach 3) compatible gamepad will work.
    Last edited by Desertboy; 24-02-2018 at 02:38 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

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