use the spindle as well on a classical cnc for precise metal work
I could find reasonably priced chinese spindles, in 65mm diameter which should fit quite well inside M4 clamps.
Power is 1.5kW (in reality 0.8kw) and collet is ER11.
Preferably, I would have gone for a 3 phases 2.2kW with ER20, but I am concerned about the overall weight of those spindles, apparently around 5.5kg, whereas a DEWALT is 2.5kg (is it?) and 65mm water cooled spindle is still 3.2kg.
I would also have to hack the clamps to increase internal diameter to 80mm but this is really not a problem for me.
Would those +3kg represent any significant challenge due to friction for belt stretch, belt motors, route dynamics, overall M4 flex, toolpath acceleration? working horizontal, vertical?
Sounds ridiculous considering first iterations of Maslow were requiring 2 brick ballasts or even the pressure required for tools to grind wood, but I have no idea of the magnitude of what the M4 design is able to endure.
use the spindle as well on a classical cnc for precise metal work
I could find reasonably priced chinese spindles, in 65mm diameter which should fit quite well inside M4 clamps.
you will want to add a sleve around the spindle, the dewalt is 67mm IIRC (just
enough different to be a problem)
Power is 1.5kW (in reality 0.8kw) and collet is ER11.
Preferably, I would have gone for a 3 phases 2.2kW with ER20, but I am concerned about the overall weight of those spindles, apparently around 5.5kg, whereas a DEWALT is 2.5kg (is it?) and 65mm water cooled spindle is still 3.2kg.
I found one I could add a ER20 to to let me handle larger bits/drills
I would also have to hack the clamps to increase internal diameter to 80mm but this is really not a problem for me.
This is a LOT more work than you think, it’s basicly going to mean building a
maslow-like machine from scratch. If you want to do that, I’ve got the CAD setup
to help you with the parts. But I wouldn’t try that right away.
Would those +3kg represent any significant challenge for belt stretch, belt
motors, route dynamics, overall M4 flex? working horizontal, vertical?
don’t know. working vertical would be more likely to have problems. I think it
will work horizontal. you would have to try it. We don’t have reports from
people trying it.
This could be a way, on the other hand I had already worked on an easy hack which I think doesn’t require much work. Since the 80mm spindles often have a first bottom collar that is < 67mm (I estimated 60mm x 16mm so enough for collet depth), only 1 clamp would require rework.
Choice of material to be determined, PLA might fit for a water-cooled spindle (glass temp starts 60-65*C, so to be checked).
Anyway, I could find one, and only one, water-cooled spindle with ER16 but still 65mm diameter. So I’ll give it a go to this no-brainer solution (still a sleeve adaptor and a PCB holder to be created as you well mentioned).
I stay in the range of 2-3kg router motor and get a ER16 which will give me access to 1mm → 10mm tools range, which is already gorgeous.
This could be a way, on the other hand I had already worked on an easy hack which I think doesn’t require much work. Since the 80mm spindles often have a first bottom collar that is < 67mm (I estimated 60mm), only 1 clamp would require rework.
The problem isn’t the clamp, it’s the arms, which then means the spools, which
then affects the placement of the vertical guides and steppers, which then
changes the clamps.
Got it. The spool system can be easily re-created and re-printed to get a larger ID=80mm+. while maintaining the same step for the large gear. Bar smartly put the encoder on the exit gear, so not over-complicated. Now the resistance of the material to abrasion comes into play.
But I won’t spend time on this tbh. Thanks for having guided the discussion.
that include the ability to resize everything, and a future upgrade to fix the
arms in place rather than have them ride the spindle. but there is a bit of
software that would need to be done to support that.
so I’d suggest that you go with a <67mm spindle for now and once you have that
working, I can work with you on a larger version.
or even the pressure required for tools to grind wood, but I have no idea of the magnitude of what the M4 design is able to endure.
