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  1. #111
    I made it a couple of times. If Johnathan could not, i could do it. Plus i have it from my drawing on my machine and is working perfectly fine.


    Though last time i did it, i said i would not do this again for the money i charged then. In short only parts are worth ~200euro, as i have to have them at hand as all is not available locally and shipping costs are included that raise the price,

    +answering to 50 emails, 3-4h redrawing for different motors and mounting, 8h to make parts and 2h for 2 people to put them together, 2h packaging, 1h sending . Plus while you are making them you learn from small mistakes.

    So if you have 500euro prepared for them, then PM me. Thats the reality folks for bespoke parts. Mind that the cheapest servo motor with hole in shaft is 1500euro plus 400euro for drive, and you need 2x.


    What i am saying here is i am just trying to help, not sell. So if sb could do it cheaper, go with him. If not- call me, i will do it.
    project 1 , 2, ...

  2. #112
    Quote Originally Posted by Boyan Silyavski View Post
    +answering to 50 emails, 3-4h redrawing for different motors and mounting, 8h to make parts and 2h for 2 people to put them together, 2h packaging, 1h sending . .
    I know the feeling....

    Having said that, I did start making a few some months ago, but got distracted by another project:

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    I already have the bearings etc. I'm willing to finish these off and sell them, as I have a bit more time now. Silyavski's price is about right, maybe a little less - fortunately I bought the bearings before the crashed!
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  3. #113
    What exactly would be included in the units you would sell Jonathan?

  4. #114
    Quote Originally Posted by Black Forest View Post
    What exactly would be included in the units you would sell Jonathan?
    That's up to you, but in the past:

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    So the mount, including pulleys and belt. You just add the motor and ballscrew.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  5. #115
    Jonathan, i would like to purchase some of the bearings from you. how much are they. 30t 5m bored out to correct size.

    Thank you
    Mutzy

  6. #116
    Quote Originally Posted by mutzy View Post
    Jonathan, i would like to purchase some of the bearings from you. how much are they. 30t 5m bored out to correct size.
    Is that just the pulleys you're after, or bearings and pulleys? For the bearings, I got the last lot from here:

    https://www.aliexpress.com/store/pro...053270817.html

    [It may help to order 2 at a time to avoid customs charges. Not sure how it works in the USA, but I ordered two with no charges, then got taxed a lot when I bought 10 :(]

    Regarding the pulleys, I can get 30t 5m HTD for about 6.30 each. Boring them accurately then drilling/tapping the setscrew holes takes maybe half an hour, so I'd be happy to sell them for 10 each plus postage.

    This weekend, I made some progress on the six mounts I'm making:

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    I'm away racing next weekend, but after that I should have time to finish these ... at last.
    Last edited by Jonathan; 25-09-2016 at 10:09 PM.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  7. #117
    Impressive nuts! I just took a look at your e-moto webpage quickly too , wicked. Great project and racing at Isle of Man wow respect that place is nuts.

    Hey I have a large router that is running well but I want to upgrade the main screw to a fixed screw rotating nut design. The screw is 40mm dia 10mm pitch and 3m long so its heavy. Running a 940W AC servo and a Grantite Devices VSD-XE servo drive, and 80VDC supply, I'm getting good response now with 8m/min velocity and about 400mm/s/s acceleration. This took a long time for me to work out the servo tuning but I got there in the end. I'd like to remove the rotating mass to improve my accelerations. The gantry it moves weighs around 150KG I estimate.

    So I am wondering are you interested in building me a ball nut for this? Happy to pay market rates of course and if it helps fund any of your emoto projects then all the better. Please contact me if this is interest to you.

    Below is my final servo response I got recently which I am really stoked about it, but to speed up my jobs I really want to up the accelerations.

    cheers
    Richard

    Click image for larger version. 

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    Quote Originally Posted by Jonathan View Post
    Is that just the pulleys you're after, or bearings and pulleys? For the bearings, I got the last lot from here:

    https://www.aliexpress.com/store/pro...053270817.html

    [It may help to order 2 at a time to avoid customs charges. Not sure how it works in the USA, but I ordered two with no charges, then got taxed a lot when I bought 10 :(]

    Regarding the pulleys, I can get 30t 5m HTD for about 6.30 each. Boring them accurately then drilling/tapping the setscrew holes takes maybe half an hour, so I'd be happy to sell them for 10 each plus postage.

    This weekend, I made some progress on the six mounts I'm making:

    Click image for larger version. 

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    I'm away racing next weekend, but after that I should have time to finish these ... at last.

  8. #118
    Quote Originally Posted by richienz View Post
    Great project and racing at Isle of Man wow respect that place is nuts.
    You can certainly say that of the riders!

    Quote Originally Posted by richienz View Post
    I'd like to remove the rotating mass to improve my accelerations. The gantry it moves weighs around 150KG I estimate.
    With that size ballscrew then you do have a problem with the rotating inertia, not so much the 150kg gantry. Can you measure the ballnut - approximate it as cylinders, then we can work out the inertia of the ballnut compared to the ballscrew to see what you could gain by rotating the nut.

    Quote Originally Posted by richienz View Post
    So I am wondering are you interested in building me a ball nut for this? Happy to pay market rates of course and if it helps fund any of your emoto projects then all the better.
    My PhD studies are taking up a lot of time at the moment (need to catch up after all the racing!), but I do intend to have time to finish some rotating nut assemblies soon.

    Quote Originally Posted by richienz View Post
    Below is my final servo response I got recently which I am really stoked about it
    What else can you plot from your system - can you plot the motor torque in addition to the speed response? If so, that's another way to work out the inertia and get better insight into how the system will behave.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  9. #119
    Quote Originally Posted by Jonathan View Post
    You can certainly say that of the riders!

    With that size ballscrew then you do have a problem with the rotating inertia, not so much the 150kg gantry. Can you measure the ballnut - approximate it as cylinders, then we can work out the inertia of the ballnut compared to the ballscrew to see what you could gain by rotating the nut.

    My PhD studies are taking up a lot of time at the moment (need to catch up after all the racing!), but I do intend to have time to finish some rotating nut assemblies soon.

    What else can you plot from your system - can you plot the motor torque in addition to the speed response? If so, that's another way to work out the inertia and get better insight into how the system will behave.
    I am too scared to watch the racing almost, its impressive riding nothing else is close really is it, but scary when a rider is badly hurt or killed, seems to be all too common.

    I'll measure up the ball nut and screw and also try find the original part numbers and specs weights etc.

    The PID loop tuning I struggle with, yes I can measure the currents I think , my Granite Devices VSD-XE servo drives have an inbuilt virtual oscilloscope that I use to measure the response with, to be honest the PID tuning I am very hit and miss with I can;t quite qork out what low pass filters I should use and why.......

    I retuned the PID loops on both x and y on the weekend and its better but still I am sure there is room for significant improvement. whip of the screw is a problem too when I get over 600RPM approx. Thats a 10mm pitch per revolution screw (isthatthe correct terminology?) so thats a speed 6000mm/min , any faster and sometimes it whips and that really gives me the shits. I'm finding that small circle cuts say a 6mm end mill cutting a small 10mm dia helix has some error in the hole and I have to crank the speed back to around 1500mm/min for cutting (the timber) rather than running at higher speeds that I'd like to.

    Anyway if you have time I would appreciate your guidance, keep on top of your studies thats top priority! Even if I can plagiarise your design and try build locally with some of your engineering input that would be greatly appreciated but if I can commission you to build one at the right price that works for us both then that's even better!!!

    Funny I was a bit ambitious the last figures I quoted in my earlier post looked good on the scope but in real life cutting it was terrible!

    Cheers
    Rich
    Last edited by richienz; 25-10-2016 at 02:38 AM.

  10. #120
    This cheap tool looks good for the KM03 locknut used if you have 20xx screws and using KM03 locknuts both sides

    Still looking for an inexpensive tool for the KM04 nuts / 25xx screw and KM05/30xx screws. If sb knows , just post it here. Otherwise most probably you have to make yourself one so you could tighten and adjust tension of your ball screws

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    table of locknuts for reference below, i use 2 each side so total of 4 per screw , locktite on thread, red paint to mark any movement, did not know at the time about washers:

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    Last edited by Boyan Silyavski; 4 Weeks Ago at 11:06 PM.
    project 1 , 2, ...

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