Changing to Hiwin design from round supported parts advice grateful.

[Clive S]

Rob it's hard to answer questions without the machine details why don't you keep all the questions in one build thread and then others and me can follow along.

Do you already have some parts or is this supposed to be the complete setup for the machine.
In item 3 above he say he has priced for deep groove bearings the Angular contact bearings are much better. I also would be buying the motors from cnc4you as you will know what you age getting and they are tried and tested.

[grain_r]

Good Morning Clive

Thank you for the reply.

My Build Log is here http://www.mycncuk.com/threads/7936-...3396#post83396

although not so much building has happened just lately after the arrival of our new baby girl although I occasionally get to the garage for a few minutes.

Being a silly billy I originally bought the SBR20 rails and ballscrews 1605's from Aliexpress and then researched after which I now realise wasnt the way but a good learning curve I have nearly got my frame and because of the time taken I don't want to come out with a second rate machine.

The parts I have are 1000mm SBR20, 500SBR20,& 300MM SBR20 Rails and the ballscrews to go with them I though I would sell the rails but keep the screws and then come out with a better machine its all that deans fault

I will have a look through cnc4you
I need to go through the logs of the machines for the electronics because I havn't really been working on that part but it's difficult to know where to start And I don't want to get it wrong this time.


thank you

Rob

[Clive S]

Ok Rob either keep using your build log or start a new one and keep it all in one place. Have you any drawing done for the nee machine? I would not buy any electronics until you have the basic design done. The drives I would use would be AM882 or similar ( they will handle 80V and are known to be good and tested.)

Are you going to design it with belts and pulleys . If you are using two motors on X have you considered one motor with a belt between the two. Like Dean does.

[grain_r]

Good Afternoon Clive

Thanks for the reply. Yes I will keep it ijn my Build log I was going too but I thought I should put it in the right forum section but I prefer to keep it all in the same place.

No I haven't altered the drawings although I know what I want to achieve in my mind. It will essentially be the same design as it was going to be with the SBR Round rails and I did design it for rails to be upgraded later in mind but I couldn't stand the thought of having drilled the holes and then swapping and it just looking so messy.
I did think originally for opting for the 1 motor and pulleys but I just couldn't get the design right because I want to be able to end mill and so I wanted to keep the ends free to clamp too although I have through after I will be able to take the spoil board off and clamp to the frame center section.

It does seem like I'm not on the best path to get everything from Fred So maybe It will be best to get the rails and the Ball-screw and then when i'm further down the road to research individual items.

I will certainly look at the AM882 driver so thank you very much for giving me a starting point to look at.

I still have a long way to go I feel before the Spindle goes in. My excitement gets ahead of me. Are the Am882 best to go for somewhere like cnc4you or are the Chinese versions the same ?

I probably should be looking at the epoxy level before the other items.


thank you

[Clive S]

Ok then post some current pics up the the build log and start from there.

[Jonathan]

One not so obvious consideration is the ballscrews getting bent in shipping. I'm not sure if this is an issue with BST, but ordering everything in one go can help as it makes the package stronger.

[JAZZCNC]

I'm not sure if this is an issue with BST, but ordering everything in one go can help as it makes the package stronger.

Freds is the most well packaged stuff I've ever had from china. For larger orders mine always comes in wooden box. Smaller orders like just couple of ballscrews come in cardboard box like most others but I've not had a bent one yet from Fred.