Thread: Spindle too heavy?
I have a small aluminium framed machine that was previously using a small 200 watt spindle. I changed to a 1.5kw spindle and after a few weeks its started making a rough noise on the Z axis. Thing is, is if I increase the speed/acceleration it sounds normal and like the spindle is no issue for it but I'm worried it will kill another driver chip(when doing 3d work) like a I did a few weeks back. Would springs on the Z axis rails help(pushing back against the Z axis) alleviate the weight problem. If I use my hand to lift the spindle a touch they sound returns to normal.
Thanks, any idea would be great!
"Doctor, I have a pain, what could be wrong with me?"
"a pimple or cancer, take your pick"
* What's the machine,
* how is the z-axis driven (e.g. belt/pulley sizes, ballscrew/pitch, leadscrew/pitch?),
* what is the z-axis motor (NEMA size, torque, current rating.)
* what voltage/driver board/PSU
* What velocity/acceleration (original/new)
* what's the weight of the two spindles
* anything else that might be relevant
I'll Take a wild guess it's 3020/6040 or some rubbish from Devon.!!
Springs cost pennys so try them is the easy answer to that question. They will help not indure but you obviously have issues so a better solution is to heal problem not cover it up with parcel tape.!
Give the details irving asked and we can advise more specific.!
I will check the rest of the details shortly and let you know.
I would just devise some counter weight like the springs idea has it will be a lot cheaper and probably easier.
Would you put a tractor engine in a mini ? put the old spindle back in and either use it like that or sell the whole machine to be replaced with something larger.
That machine has 1204 trapezoidal lead screws with Delrin or bronze nuts so very inefficient. The stepper motors are probably 1.1 or 1.5Nm. I'd hazard a guess the Z-axis stepper is struggling with that additional weight. You either need to counterbalance it, or upgrade the stepper/driver combo or replace the leadscrew with a ballscrew.
As Jazz says, you're on a hiding to nothing....
Last edited by irving2008; 11-01-2014 at 07:13 PM.
I will counterbalance it for now, only needs to last another 4-8 weeks while I order the rest of the parts and build it. Is there a method to choosing a spring or is it just trial and error. I reduced the accel to 50 today and it did a full 3d job just fine and the noise wasn't too bad but noticable. I also cut some Aluminium for the first time and I'm pretty please with the result. This machine will be my fulltime foam cutter once the new one is up and running.
Cheers for the help guys, Isaac
As a very quick cheap short term fix you could try rigging a "bungee". G.
Last edited by GEOFFREY; 11-01-2014 at 07:39 PM.
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