Rotating Ballnut - design ideas

[Jonathan]

The minimum pulley size that I could fit on the shaft was 30T, so that's what I used. By machining the pulley teeth directly into the shaft, as with my first version, a smaller pulley could indeed be used, but it adds a lot of time to the machining.

The shafts are 35mm diameter, so it's a bit thin even with 30T as you can see from the previous one I made, here:

[mutzy]

Jonathan, how are you?
1. Where did you get the pulley that is associated with post 79? Was it machined out with a larger bore to fit the shaft or store bought? Where can i get one?
2. I see that there are two different shaft configurations with the pics. One the shaft where the ballnut attaches sits kind of deeper in the cupped out area, and the other sits flush with the whole face. what is the reason for this.
Thank you so much for your time.

[Jonathan]

Where did you get the pulley that is associated with post 79? Was it machined out with a larger bore to fit the shaft or store bought? Where can i get one?

I used a standard pulley and bored it out to the size of the shaft.

I see that there are two different shaft configurations with the pics. One the shaft where the ballnut attaches sits kind of deeper in the cupped out area, and the other sits flush with the whole face. what is the reason for this.

This shaft where the face is 'cupped out' leaves a surface to locate the ballnut concentric to the shaft. This works well if the ballnut is accurately machined, but I found that you can't necessarily rely on this so sometimes it's better to just go with a face and align the nut with a DTI.

[mutzy]

Thank you Jonathan. What is a DTI?

Mutzy

[Clive S]

Thank you Jonathan. What is a DTI?

Mutzy

Dial test indicator https://www.machinemart.co.uk/p/cm22...c4FBoCNljw_wcB

[Jonathan]

e.g:

[Black Forest]

Hello Jonathan, Do you not accept PM? I would like to contact you.

[reefy86]

Jonathan do you sell these to other people at all or know anyone specifically who can make the from drawings?

cheers

Ash

[mutzy]

Hello Jonathan, how are you today? Wow, you certainly created a great thread here. I can't seem to find distributors that have this size bearing to bore out. Do you have any suggestions of who might sell them? USA would be best for shipping. Once again thank you.

[Boyan Silyavski]

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.