New build - Steel - 3 Axis initially then conversion to 4 axis.

[Slixxor]

I wouldn't be worried about the steppers but the drives in your spec you have said that you are using these M542H If I am not mistaken the max voltage they will handle is 50V so 48V would be too high for them. AM882 drives would be a better choice running at about 68-70 V.

If you want a decent machine you have to have decent electronics.

Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.

[Clive S]

Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.

Ok then if you have not bought the motors either then try and find 8 wire so they can be connected in parallel and get the lowest inductance motors you can find these are proved and tested by many over here :- http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf.

Good luck with the build.

[Slixxor]

Ok then if you have not bought the motors either then try and find 8 wire so they can be connected in parallel and get the lowest inductance motors you can find these are proved and tested by many over here :- http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf.

Good luck with the build.

I have the motors already and all mounting hardware. saving the electronics for last. The AM882's are in the price range. I am running dual ballscrews on the X Axis. so additonal cost. but oh well :)

[mekanik]

You can run both X axis screws with one motor and belt connecting them,it's common practice with the guys on the forum.
Good luck
Mike

[Slixxor]

You can run both X axis screws with one motor and belt connecting them,it's common practice with the guys on the forum.
Good luck
Mike

I have noticed that. but whats the go with custom belts? Obviously each machine will differ in length required. Do you simply ask for a particular length?

[mekanik]

You can get custom belts but they are more expensive, but you have a lot of leeway length wise as you will have adjustment on the motor and your tension/routing belt layout. there was a post on the forum a while ago showing a belt routing setup to address this issue.
Regards
Mike

[Slixxor]

Ok. Z AXIS design time. What is the acceptable leverage ratio of a sturdy Z?

My length of linear rail is 450mm. I was hoping for 300mm
Of cutting depth but it seems like there would be excessive difficulty keeping my Z cutting straight with a 150mm (1/3 ratio) binding area for the spindle on a 450mm run. What do you all suggest?

Also, would be wiser to mount the linesr bearings on the spindle plate or on the gantry plate?

[Slixxor]

X and Y axis bolted and mounted. Was a very tight fit on the Y axis bearing blocks but It fits like a glove :)

[Slixxor]

Few more updates. a redesign of the Z axis and some major work to keep it all straight. moves very smoothly now. Z axis is 6mm steel. working on the ball screws next.

Here's a quick vid of the movement: https://youtu.be/DRLe3EPQ01M

Here's some photos.