Am i missing something? Why you need 750w servos on a Bridgeport. 400w will do the job
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Am i missing something? Why you need 750w servos on a Bridgeport. 400w will do the job
Ye, I think it was a question from someone else and it's gone off topic a bit. Nothing to do with this thread I think.Quote:
Originally Posted by Boyan Silyavski
I don't know i will need to find out. Do the cheap Chinese controllers do both methods?Quote:
Originally Posted by JAZZCNC
No, not normally.Quote:
Originally Posted by Colin Barron
Step / Dir is common. Analog, less so.
Can't answer that because depends how cheap your talking. If you are talking the Newker type then I think most of them have both but if you are talking the really cheap Chinese controllers then no most will only be Step/dir.Quote:
Originally Posted by Colin Barron
However, my main reason for asking this question was more to find out if what you plan to use will provide high enough frequency that you can get the full resolution and speed from the servos. Asking about Step/Dir was to get an idea of how hard or easy you are going to have it to set up the servos, esp if using the cheap Chinese servos which don't offer any help with motor tuning.
Dave who started the thread used 750w servos.on his BridgeportQuote:
Originally Posted by JAZZCNC
To be honest, Colin if your converting a Bridge port then I would seriously consider Closed-Loop steppers because they will easily match the performance that Bridgeport limits you too. In my opinion, Servos are a costly and complicated overkill for a bridge port.
Now Stepper technology as got so much better with Digital drives and Closed-loop feedback then they are a good match for Older machines like Bridge ports.
The secret is using the correct drives and sizing the motor. The Lichuan mains-powered drives that I use with 9Nm 3 phase motors will easily handle anything a Bridgeport will throw at them and are quite a bit Cheaper than cheap Chinese servos. They are simple devices with hardly any setting up required, just Fit and use.
https://www.aliexpress.com/item/3279...3cac6f37EbjJgf
On my easyiturn3 lathe it has steppers and Parker CD20/1 stepper drives, would this old tech work with one of these Newker controllers, http://newker-cnc.com/index.php?m=co...=166&l=3&id=91
Dunno that one but the incremental version of the Newker would almost certainly work with an existing stepper drive / motor setup. At some point there will be a step and dir signal to tap into. Even the old analogue controllers tended to have a step / dir output from the CNC controller before the signals passed through a "positioner" that generated the +/-10V control voltage. To my mind, there's a lot to be said for retaining the existing powertrain if it all works OK.
With the Newker controllers, make sure you don't get one of the "bus" versions, as they use some sort of serial bus to pass the positional signals etc to the (servo?) drives. The basic "incremental" ones send out the standard step and dir signals.
You'll notice that the screenshot of the controller in the link shows a 990TD (lathe) controller with X and Z keypads - but a 4 axis 990MD (milling) display showing X, Y, Z & A. The power of Photoshop!
I think you can only use Newker Drives with there Bus Controllers because they use their own propriety protocol.Quote:
Originally Posted by Muzzer