Thread: Rotating Ballnut - design ideas
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.
Having said that, I did start making a few some months ago, but got distracted by another project:
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!
What exactly would be included in the units you would sell Jonathan?
4 Weeks Ago #115
Jonathan, i would like to purchase some of the bearings from you. how much are they. 30t 5m bored out to correct size.
3 Weeks Ago #116
[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:
I'm away racing next weekend, but after that I should have time to finish these ... at last.
Last edited by Jonathan; 3 Weeks Ago at 09:09 PM.
1 Week Ago #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.
2 Hours Ago #118
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