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  1. #81
    Quote Originally Posted by blackburn mark View Post
    im assuming you slackened everything off at one end (nut housing and bearing housing) and ran the gantry to that end and nipped it up, then did the same at the outher end... back and forth a couple of times to make sure
    Yes I did exactly that. I think I'll try it again.

    I saw on you-tube a video about making ballscrews and they straightened it by putting the screw between two blocks, and pushing down in the middle with a lever to bend it.

  2. #82
    I saw on you-tube a video about making ballscrews and they straightened it by putting the screw between two blocks, and pushing down in the middle with a lever to bend it.
    sounds like a winner
    just take your time untill you know how much pressure it takes to get it to move or youll end up going passed the sweet spot and youll be chasing muliple curves up and down it till new year :)

  3. #83
    I relieved most of the tension on the X screws and now it's much better. Seems happy at 3600mm/min over the whole bed. I'm using a 42T pulley on motor, and the 28T pulley I posted about earlier on the 2.5mm pitch screw.

    Bed surfacing, not terribly exciting but it demonstrates the vacuum working reasonably well:

    http://www.youtube.com/watch?v=Jb1TL..._order&list=UL

    Click image for larger version. 

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  4. #84
    Been doing a bit more testing, latest videos:

    This is the video of the first ever test...
    http://www.youtube.com/watch?v=ZrhZL..._order&list=UL

    And here I tried machining some aluminum:

    http://www.youtube.com/watch?v=b4NrS..._order&list=UL

    Bit of a faliure! I think I'll try that again but with it mounted higher on the bed. I could see/hear the Z wobbling.

  5. #85
    Owch !!!
    a bit uggly on the aluminium :( im a bit gutted
    i was over the moon with mine, 3mm single flute 3000rpm, cant remember the feed i also had a go with the engaving spindle at about 10000rpm cutting small fonts (low feed) and they both were lovely and crisp

    if mounting the work higher doesnt work out to well id be really tempted to stick a block n tackle above your gantry and make provisions to drop it down by 3/4 for alli and any fine work

    im confident you would be amazed at the diffrence it would make
    i guess it depends on what you are going to do with the machine generally

  6. #86
    Quote Originally Posted by blackburn mark View Post
    Owch !!!
    a bit uggly on the aluminium :( im a bit gutted
    i was over the moon with mine, 3mm single flute 3000rpm, cant remember the feed i also had a go with the engaving spindle at about 10000rpm cutting small fonts (low feed) and they both were lovely and crisp
    That's a lot less aggressive than 3 flute 8mm ballnose with 1mm DOC and 2m/min I tried! Anyway I've since noticed the plywood router mount I made isn't as tight as I thought which should make a huge difference.

    I think I will look into making it easy to lower the gantry.

    Having said that it's working nicely with woods:
    (Wind turbine blade mould section)
    http://www.youtube.com/watch?v=93SSlH0ldC4

    We got chickens recently, so I made an egg holding device for my Mum for Christmas, hopefully it will go down well:

    http://www.youtube.com/watch?v=GZC_0PWQc3g

    I'm certainly pleased with the finish on that.
    Last edited by Jonathan; 25-12-2010 at 01:59 AM.

  7. #87
    3 flute 8mm ballnose with 1mm DOC and 2m/min
    i wouldnt dare!! :)

    the vid you posted isnt working
    i could do with getting some vids up (might have to speed them up a bit to make it look like its actualy doing something)

  8. #88
    Quote Originally Posted by blackburn mark View Post
    i wouldnt dare!! :)

    the vid you posted isnt working
    i could do with getting some vids up (might have to speed them up a bit to make it look like its actualy doing something)
    One of the videos hasn't finished uploading. It'll be done in 5 mins...you were too quick!!

    I often sped up the videos on my milling machine.
    Better go, cat is drinking my tea again, sigh...

  9. #89
    One of the videos hasn't finished uploading.
    just watched them both :) splendid!! it is nice and quick
    wind turbine blades!! can i order three for my paramotor :)

  10. #90
    fanatic jonathan i read all your post and watched all your vids love it keep um coming :)

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