DMM Tec Servos

[mactec54]

giz

The 110/220V Drives are now being tested,A release time has not yet be set, the 7.2nm motor now can run up to 5,000 RPM

[mactec54]

kregan

The encoders are sealed so that part should not be a problem, the motors are not, You could do what Haas & many other manufactures do, with just a sheet metal cover/box over the motors, the bottom of the cover/box is left open, & sealed were it mounts to the machine

[ihavenofish]

The motors are the right ones for a ballscrew of 25x25, so you are on the right track there, You could not go with a smaller motor unless you geared it down

lies, all lies!

this machine actually runs happily with a cheapie 270 oz in nema23 stepper on a 42v power supply, all the way up to 1000ipm with acceleration set pretty high as well. basically a 400w 3000rpm (1.27nm continuous torque servo would work well with a small spindle. 750w 3000rpm (2.4nm) would be fine for a 3hp spindle. peak torque is 3x the contunuous for short durations on most brushless servos.

the dmm 300w 1000rpm 2.9nm model is a little overkill for this router in general, even with a 3hp colombo spindle, but its cheap and the speed cutoff is in the perfect range (984ipm x 787ipm y and 630ipm z). if you run the 400w dmm with a belt, youll be 50% faster, and almost the same torque, more compact, and cheaper. but of course you need to rig a belt and pully set.

i know a couple of xzero demons have the 1000rpm models installed already, should be a video of it running somewhere if im not mistaken.

[mactec54]

ihavenofish
Quote es, all lies!
i know a couple of xzero demons have the 1000rpm models installed already, should be a video of it running somewhere if im not mistaken.

It is quite obvious you have no clue what you are talking about as usual,

You said it is the wrong servo motors, then at the end of your post say there are some xzero demons with the 1000rpm motors

That is what he is looking at & going to use for his demon machine, just the same as what is being used already

[ihavenofish]

ihavenofish
Quote es, all lies!
i know a couple of xzero demons have the 1000rpm models installed already, should be a video of it running somewhere if im not mistaken.

It is quite obvious you have no clue what you are talking about as usual,

You said it is the wrong servo motors, then at the end of your post say there are some xzero demons with the 1000rpm motors

That is what he is looking at & going to use for his demon machine, just the same as what is being used already

um. no, i said there are some people running these 1000rpm 300w motors. i also said they are overkill, and the smaller 400w 3000rpm motors will be more than adequate direct drive unless you use a big spindle.

you said you could not go with a smaller motor, and this is plain false, cause ive done it.

now without resorting to personal insults, whats not to understand?

[mactec54]

ihavenofish
Quote
you said you could not go with a smaller motor, and this is plain false, cause ive done it.

We have all seen what you have done, That also is not what I said, So get it right

For a starter DMM does not have a 300w motor that is a 1000rpm
The 300W motor spec is 48V, Max 3000rpm, rated torque:1.14Nm(160 oz-in),

As you can see the 300W motor with 160 oz-in Rated Torque, would not be enough for a 25mm pitch ballscrew on this machine

So what I said is correct
The motors are the right ones for a ballscrew of 25x25, so you are on the right track there, You could not go with a smaller motor unless you geared it down

Note what I said, You could not go with a smaller motor unless you geared it down

2.1 is all that is needed if someone wanted to go with a smaller motor

[ihavenofish]

$328 kit, 2.9nm, 1080rpm. thats the big motor right? thats 300w assuming the torque is flat.

thats the motor im talking about, that is the one that has been put on xzero demons with 2525 screws. its overkill on torque, but has a good speed range. overkill isnt a bad thing in this case. there is a limit to useful torque on a machine like the demon though, its only aluminium after all.

$280 kit, the one on the dmm page listed with 1.27nm continuous torque at 3000rpm, thats 400w assuming the torque is flat. this motor in DIRECT drive is good for the demon or raptor with 2525 screw, unless you go with a very powerful spindle. (most people wont). you will waste alot of the speed though, topping out in the 1500rpm range on the machine simply due to the screw length/balance.

now relax, you dont want to lose customers by being a hothead

[mactec54]

ihavenofish
Quote now relax, you dont want to lose customers by being a hothead
es, all lies! plain false, cause ive done it.

What ever I have said in these posts is a reaction to what ever you have written & there is nothing hothead about it

I'm not sure what you mean, lose customers, I only help people who buy the DMM system
get there system up & running, I'm not an employee of DMM

I have installed a lot of the Dmm systems, & others as well, so I know what works best for there system,The information I give is from doing installations & not just from testing there system

The motor you are talking about is the motor that azam1959 had already selected
They are not a 300W motor

At 48V 1050rpm at 60V 1350rpm, at 110/220V it will do 5,000rpm The motor you are talking about is a 750W AC servo motor derated only by the input Voltage

The 400W motor is not suitable for a direct drive to a 25mm Pitch Ballscrew, will it drive a 25x25 Ball screw Yes It Will, So will 100W motor drive a 25mm Pitch Ballscrew

The problem is 400W will drive it but what happens when you need to use a .500 cutter or bigger, Do you really think rated torque: 1.27Nm(179 oz-in) is going to cut it being direct drive, It is Not, most people with routers want to cut what they are making, not scratch at it for hours

If you use 25x10mm pitch Ballscrew then the 400W motors will work very well & in there power range

[ihavenofish]

in the supplied kit at 48v, its 300w. its pretty irrelevant at higher speeds in this specific case, you cant spin the screw much higher than 1000rpm anyway.

as for 1.27nm continuous, yes, its quite adequate actually on the 2525 with a gantry load of about 100-120lbs. using 3hp colombo spindle with 1.2nm torque will give a maximum of 190N or 42lbs of force on a 1/2" cutter. bigger cutters will exert LESS force on the axes at the same spindle torque. a 1/4" tool would exert 84lbs, but its likely to break with that kind of force. for reference, that cut is 1/2" width, 1/2" depth, 620ipm in the hardest wood you can find (none of this butter soft rock maple). thats not a cut most people would expect to run on a light machine like this.

on the motor, that translates to a mere 0.8NM

the screw itself has about 0.3nm drag

that leaves plenty of torque to overcome screw inertia and still acelerate at up to 0.15G, without moving into the intermittent torque zone.



edit: big math error, ahhh!. point still stands though

[mactec54]

ihavenofish

How do you figure out that the motor kit we are talking about is 300W at 2.9nm

When the 300W motor that Dmm does have in there other kit is only1.14nm 160ozs

So were do you get this number of 300Watts from

[ihavenofish]

ihavenofish

How do you figure out that the motor kit we are talking about is 300W at 2.9nm

When the 300W motor that Dmm does have in there other kit is only1.14nm 160ozs

So were do you get this number of 300Watts from

uh. 2.9nm at 1000rpm = 300w.

1080rpm would be 330w, but the drawing shows the torque drop off shortly after 1000, not sure if it makes it all the way to 1080 at full torque.

[mactec54]

ihavenofish

A different way to look at it, but not correct

48V x 8amp=384W this is the minimum it could ever be at 48V

The motor runs close to 10amps when running which makes that 480W so the kit as you get it is 48V 480W with a max of 20amp 960W output

The 60V option 60 x 8=480W at 10a running 600w with a max of 20amp 1200W output