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11-08-2017 #1
Hi Clive,
I was playing around with the stepper calculator from this forum...
1605 on Z 1:1 ? or also reducted?
Picking the 2010 over a 1610 on x axis ,1700mm between bearings, is about critical rpm vs speed... looks like i need 2010 to reach up to or over 5 m/min.
What is your opinion on these?
Since i am a beginner i am not sure what the max speed is i would need for cutting and rappids
Some other materials might need faster speeds i am not sure...
2.2kw spindle makes cutting at lower rpm easier combined with a quality vfd.
I am trying to pick the right quality parts to make a versatile machine.
Any help is welcome.
Please share your concerns.
No linear parts or elektronics are bought yet.
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Picking the 2010 over a 1610 on x axis ,1700mm between bearings, is about critical rpm vs speed... looks like i need 2010 to reach up to or over 5 m/min.
Don't buy any electrics until you have it all drawn up in CAD AM882 or EM806 work well for the drives at 68V..Clive
The more you know, The better you know, How little you know
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The Following User Says Thank You to Clive S For This Useful Post:
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12-08-2017 #3
Dear Clive S,
My design dictates at least 2 idler pullys per ballscrew if i want to go single x axis nema 34 stepper... and have the whole bed space.
Or... i have to limit bed space and cross the bed...There is room in the design to do this though.
And 1 side is up against a wall anyways.
When going single stepper,
i think i would buy a wide stepper pully,
and shift the ballscrews a belt width and use 2 belts, 1 for every ballscrew.
For now a 2 stepper x setup looks more convenient from a mechanical point of view.
2 short belts.
lots of bed space
My Electronic pov is opposit.
For inertia it seems, in my mind, better too.
2 powerful 3+Nm steppers on high voltage digital drivers. Instead of a single bigger 8/12nm nema34. this is just a gut feeling , not based on any sound research.
Not sure what makes a 3, 3,1 or 4 Nm nema 23 stepper best choice.
Just high amps low inductance right?
Any thoughts?
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For now a 2 stepper x setup looks more convenient from a mechanical point of view.
2 short belts.
lots of bed space
with am882 drives from China
I do have a nema 23 4Nm on my mill but don't see a difference in them..Clive
The more you know, The better you know, How little you know
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13-08-2017 #5
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09-09-2017 #6
Dear Boyan,
Not sure iam really clear what your preference is.
Do you mean use a single motor on 2 belts solution?
Mechanical advantage is :
- Y axis can not get out of alignment easy?
* disadvantage idler pullys
or
use 2 motors and solve alignment in the homing sequence by electronic controls...
- Y axis can be aligned easily that way.
* Some (cheaper) controls dont do gantry squaring sequence.
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09-09-2017 #7
if you are experienced with belts, know how to tighten properly long belt, know how to align all components then go with 1 motor and belt system. If you dont have the space, have a suitable controller board, go with motor each side. At the end is a question of convenience.
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