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  1. #181
    Quote Originally Posted by 2e0poz View Post
    Your almost right Jonathan? The screw is very hard and can easily crack (only the centre is soft). If this is added to the floating end then no need to knurl it, just go for a nice tight slide fit and let the loctite do it's job.
    The reason I knurled it is because that's what John S does. Well, says he does at least. Could anneal the very end of the screw to stop the risk of cracking, but that's probably taking it too far.

    Putting the extension on the 'floating' end sounds good to me as all it's doing is stopping the screw whipping, not transmitting torque. The other end is probably easier though as the tolerances to fit the pulley are not tight as for a bearing. It depends how much we need to add?

  2. #182
    Jonathan the problem wih extending the belt end is as you have pointed out to is torque on the jointed section. As WG said that end can always be machined to allow for the pulley. An even easier solution is to just extend out the floating bearing housing with some ali round bar and mount the bearing in the end?

    At the end of the day the KISS approach is always best, less to go wrong
    If the nagging gets really bad......Get a bigger shed:naughty:

  3. #183
    I haven't got a clue what your all taking about but I think I've solved the problem.

    If I take the retaining nut off and have the pulley machined to slide over the threaded part and have 2mm machined of the pulley shoulder and fit a grub screw plus slide the other bearing right to the end and cut off the excess ballscrew material It will fit

    Click image for larger version. 

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    what do you think is this a solution or am I making more problems for my self

    James
    Last edited by luke11cnc; 18-10-2011 at 09:22 AM. Reason: add image

  4. #184
    No one with any advice on my solution ??

    James

  5. #185
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    I take it you're going to replace the bearing clamp nut with a thread in the pulley. If so you'll need a more positive location for the pulley, one grub screw just won't be enough. Possibly a pin right through the pulley and shaft when it's clamped up tight.

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  7. #186
    Well after a lot of soul searching I've decided to take it down to my local engineering shop and have it rematched if it doesn't work I will have to buy a new one but I'm not going to cut corners to make it work now

    and if it works they can do the other one (z-axis) as that is the same

    James

  8. #187
    Quote Originally Posted by luke11cnc View Post
    take it down to my local engineering shop and have it rematched
    Rematched? Wont they charge a lot :(

    Quote Originally Posted by luke11cnc View Post
    if it doesn't work I will have to buy a new one but I'm not going to cut corners to make it work now
    I'll buy the old one if it is spare, then you don't loose out. Just need to get ball-nuts for it and that's my milling machine X and Y sorted. I need to do the end machining myself for that anyway.

    Quote Originally Posted by luke11cnc View Post
    and if it works they can do the other one (z-axis) as that is the same
    What is the overall length of the Z-axis screw?

  9. #188
    Jonathan the length of the z axis is 400mm

    and yes if a new y-axis is required then you are welcome to it


    James

  10. #189
    Just to let you all know the build is back on


    Luke is walking now with shoes on so I'm getting him in the garage at the weekend to work on his CNC machine.

    we have so much to do and I am hoping to get the machine up and running by the end of November

    James and Luke

  11. #190
    well we did do some work on the CNC Machine at the week end and have now mounted the gantry support extrusion to rear beam and gantry sides

    Click image for larger version. 

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    poor poor Luke "Dad how many more time do we have to take it apart just to build it back up again"


    Click image for larger version. 

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    at the week end we also started the mounting of drivers in the old computer


    Click image for larger version. 

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    Now I must admit I did most of this and Luke just did the last one and as you can see he finished mounting the transformer

    Click image for larger version. 

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    In this image Luke is drilling out the y-axis supported rails as they came blank

    Click image for larger version. 

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    I'm hoping to receive the y-axis supports from Jonathan on Saturday

    so we can fit them on Sunday as Mum is out for the day

    any way I just thought I would post a quick update

    James and Luke

    Ps

    it's Luke's bday next month any suggestions for a CNC related present ??

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