is it normal to be able to stop the spindle by hand

[winegummo]

hi.

I have a 6040 with a 1.5w spindle. Is it common to be able to stop the spindle by hand at 12000rpm? I would think not so I am wondering what i should be looking at next to solve this.

yooncnc
120v
1.5w spindle

thanks in advance

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[routalot]

I wouldn't dare put my hands anywhere close to a decent spindle at any speed.A hand held trim router will typically have 600W.Have you missed out a K?

[RCaffin]

Tear your whole hand off, not just your fingers!

Two problems:
Slowing the spindle down from 12k rpm will burn your hand off, dissipating the rotational energy.
A PS with enough volts to get the spindle up to 12k rpm but then let it be braked by hand should have such a low output current that it should take forever to get up to speed.

I question the initial claim.

Cheers
Roger

[mactec54]

hi.

I have a 6040 with a 1.5w spindle. Is it common to be able to stop the spindle by hand at 12000rpm? I would think not so I am wondering what i should be looking at next to solve this.

yooncnc
120v
1.5w spindle

thanks in advance

Need more information on the VFD Drive and the Spindle spec's

This is a common problem when you have only a 120v power supply for a 3phase spindle, this can be helped some by setting the correct VFD Drive Parameters and getting a good 20 amp power supply source to the VFD Drive

[mactec54]

Tear your whole hand off, not just your fingers!

Two problems:
Slowing the spindle down from 12k rpm will burn your hand off, dissipating the rotational energy.
A PS with enough volts to get the spindle up to 12k rpm but then let it be braked by hand should have such a low output current that it should take forever to get up to speed.

I question the initial claim.

Cheers
Roger

This is a common problem when you run a 3Phase spindle on 120v single phase, you can stall them very easy if not setup correct stopping with your hand is quite easy to do

And no they get right up to speed or they would fault out the VFD Drive there is a torque boost when these spindle startup to get them up to speed

[winegummo]

oops.. ya. i missed the k

1.5kw

1 would normally never try and stop it by hand. it was a slow process of discovery as we were having troubles with the motor stalling during simple drilling functions.

[winegummo]

thanks. Mactec54..

My initial google searches didn't seem to show up others having the same issue but i also suspected something like this. I will gather up a bit more information while i am in the shop on Friday. would any pics help?

would this also contribute to why the spindle never gets hot? Its a water cooled unit and we have never felt the need to install the water cooling system. It also blows a fuse when it stops.

[winegummo]

i agree that a fully operational spindle is way to dangerous to touch. That's why this is a problem. Spindle gets up to RPM no problem. just has no torque at all.

[mactec54]

oops.. ya. i missed the k

1.5kw

1 would normally never try and stop it by hand. it was a slow process of discovery as we were having troubles with the motor stalling during simple drilling functions.

Drilling functions are not simple

How big was the drill ? and they need to be good quality or they will create a high load to drill a hole a drill usually need more torque than a cutter of the same size, so drilling in general are more demanding of a spindle like this

[gfacer]

And 12k is pretty damn fast for a drill. My 3.8kw HSD spindle stalled out drilling at about 5k rpm.....so if you are slower than 12k it's more likely still.

Edit: might have been even lower than 5k rpm, 5k might be what I set it to so it didn't stall.

Sent from my motorola one using Tapatalk

[winegummo]

Drilling functions are not simple

How big was the drill ? and they need to be good quality or they will create a high load to drill a hole a drill usually need more torque than a cutter of the same size, so drilling in general are more demanding of a spindle like this

it was a a 6mm. we tried a few feed/speeds and peck drilling.

[winegummo]

we were drilling slower but we also found that even at 12k rpm. it had no torque. i think we were trying from about 5k to 7 or 8k. I'd have to check my notes at the shop

[mactec54]

we were drilling slower but we also found that even at 12k rpm. it had no torque. i think we were trying from about 5k to 7 or 8k. I'd have to check my notes at the shop

The water cooled have a minimum speed of 6000RPM so if you can go below that number then the VFD Drive has not been setup correct

6mm should of been ok at what feed and material where you drilling

[winegummo]

The water cooled have a minimum speed of 6000RPM so if you can go below that number then the VFD Drive has not been setup correct

6mm should of been ok at what feed and material where you drilling

it was just aluminum. not sure what grade. I'd have to check the notes for feed but it didn't seem at the time to be overly aggressive. thanks for the tip on the RPM. I'll test that as well.

[winegummo]

https://photos.google.com/photo/AF1Q...o4-W0prjv-JlTv

hope this link works. i am having troubles uploading images to CNCZone.

opened the box yesterday and all connections seem to be well secured. No discolorations from etc.

Watched through this video and it all looks normal for a machine not connected to mach3

I also read through the Nowforever manual. I am noticing that both the vfd and spindle are rated for 220v but i bought the 110 version. Is that my problem right there?