Quote Originally Posted by Chrono View Post
As far as I understand, they step up the controllers signals to 24V and handle isolation between the electronics and the controller? The UB1 looks great, but the price is another 200€ on top (on that note: Where did you buy your BOB, if I may ask? I can only find a couple shops, some of which sell it for twice as much as others)... if only i had a schematic, then i could just roll my own :D
Don't skimp on the BOB it's just as important as the controller and the single most troublesome part of any machine when it's done on the cheap.
The UB1 is good BOB, thou i'm not keen on the spring loaded terminals but other than that it's well made and very capable.
I've seen Many electronics geeks try to Roll there own and 99% fail resulting in wasted time only to buy one in end.


Quote Originally Posted by Chrono View Post
Regarding the linear motion: With both the 25mm rails and the ballscrews, I have the choice between HIWIN stuff and "mainland china" rails with "C7" ballscrews. The difference is 670$ to more than 1000$... Are there any verdicts on the quality of the chinese alternatives?
You can get Hi-win from china and the ballscrews are Ok for the money. They also sell C5 if you want little better.

You don't need 25mm rails for machine this size and it will actually negatively affect the machine compared to 20mm rails because of the extra inertia etc the motors will have to deal with. These may seem little negative things but together they add up into large negative which affects performance.

Regards the VFD it will damage the VFD eventually by switching it off and on thru a relay. It's also not safe due to capacitors causing a delay in it powering down.

Not looked at the schematic too close but will take a look. The schematic Joe used mostly came from me so should make sense..