x2 spindle motor replacement options ?

[wizard]

The point I was making is that the mill is not inherently bad, especially for the price, but in your case it looks like you got a poorly assembled mill right out of the box. That sucks actually. It might have been reasonable to just return the mill. It amounts to buying a new car and having it seize up on the drive home.

The only difference that I can see is that your local car dealer has the people in place to put a new engine in the car. Most of the machine tool dealers seem to be wanting in their ability to service what they sell.

the very first time that I had used the machine to do some cuts the spindle stalled and broke the end mill , a 1/4" end mill that was taking a .1 depth of cut and 50% engagement . it also destroyed the gearing after i put in a new tool to finish the part , its not as though i was abusing the machine with that size of tool . 45 minutes of cutting time and the gearing is toasted .
If that is pushing it beyond its capabilities then what are its capabilities ? it is rated to use up to a 5/8 end mill , i don't see how i can expect to use it as is with a 5/8 end mill when a 1/4" can stall the spindle at such a light cut ?
If this is what i have to expect from the $800 that I spent then it is a joke , its no intention to insult anyone and their happiness with their machine but maybe my disappointment can be understood .
I do want to get more out of it which is why I originally asked for help , something which i rarely ever do in the forums . In the meantime I was able to do some research and found what I hope will help with doing some re-engineering .
I'm always open to better suggestions if anyone cares to offer them , otherwise i think that I've found all of the info that i need anyhow

I see that you have a better motor controller, that is a good thing. However you now have the capability to put even more current into the motor, so you want to be careful about how you set up that controller. In the end I would be surprised to find out that you need a new motor too. That isn't a bad thing as the new controller should allow you to drive many makes well.

The sad part here is your spindle. It still sounds like something isn't right there.

I will do what it takes for me to be satisfied with the spindle performance and if the new board isn't to my liking then I've found a number of other alternatives . So far everything else is good , so in the meantime it works , and at some point very soon i will get the right spindle setup on it and I'll be happy


.

Sounds good! If you are like most of us you will never be 100% happy. Like I said the machines are impressive for the price but they do require a bit of tinkering to keep working well.

[dertsap]

It might have been reasonable to just return the mill. .

it would have been reasonable but I've own it for a year or two (can't remember exactly when I bought it to be honest ) I've had this sitting in wait for me to cnc it , finally got around to doing it .
With the grinder mods and the tapped holes in various places then I'd get some funny looks from them anyhow if i tried to return it .

[Al_The_Man]

heres the board that i bought on ebay

That board looks like the one that fits over the stake on terminals and converts it to terminal strip, also AC line fuses.
For smoother operation, the KB PWM version rather than SCR type, would be better.
BTW, you should also use the I1 I2 terminals if you stop the motor by the armature leads instead of input power.
Al.

[dertsap]

That board looks like the one that fits over the stake on terminals and converts it to terminal strip, also AC line fuses.
For smoother operation, the KB PWM version rather than SCR type, would be better.
BTW, you should also use the I1 I2 terminals if you stop the motor by the armature leads instead of input power.
Al.

I thought that with it being complete with the terminal board on top then it would save me a bit of trouble
if this fails then what kb pmw would you be able to suggest ? I'm no electronics guy , I know enough not to kill myself and am capable of doing by example which is why i decided on this board , a number of guys have used the kblc-120 board but it only puts out 90v
i don't know what the difference is between the kblc-19 and the kblc-19mod but I've seen stuff over the net where guys have used them and there are a few within the forum that used those boards (mod or not)
heres one http://www.cnczone.com/forums/bencht...ply_my_x2.html

[Al_The_Man]

Depends on what the voltage is of the motor you have, the SCR types cater for 90v or 180vdc motors, the KBIC-240D covers both and the PWM KBWD-16 is the 'Whisper' PWM series.
KBLC mod is just an add on board to the KBLC-120.
Al.

[dertsap]

the motor voltage is 110 , I avoided the KBIC-240D and the KBLC-120 because they'll only put out 90v , the KBLC-19 puts out up to 125v , I figured that I'd be better off with a little extra voltage vs not enough .
I'll see how this works out and if I'm not satisfied then I'll check out the KBWD-16 , it looks like they're roughly only $100

[Al_The_Man]

I see Galco have them for $80.00, thats not bad.
Al.

[dertsap]

that isn't bad at all , i just quickly looked at the first site that came up , and came up with $102 , even at that it blows away the $160 to replace a crappy stock board .

one thing that I'm curious about are treadmill motors . those suckers are at roughly 2 - 2.5 hp and roughly 6000 rpm .
them motors are 18 amp and 90vdc , which seems to me that they need some pretty decent power , any idea off hand what control a guy would need for a motor like that ?

[Al_The_Man]

Many use the KB or Baldor equivalent SCR drives, but take the 2.5HP with a pinch of salt,
If you compare the size with an industrial 2.5hp brushed, they are usually much larger,
also it takes a well designed (expensive) DC brushed motor that will run at 6000rpm?
Al.

[dertsap]

i sort of figured that might be the case , heres one off the top of the ebay page , there are loads that are similar TREADMILL PERMANENT MAGNET MOTOR 130V DC 2.5HP 18 amps | eBay

[Al_The_Man]

One like this looks decent construction 360388512832.
If you are lucky, a Leeson or a Baldor T.M. motor sometimes come up.
Or look for an older Gettys or Fanuc DC servo motor, they also have tachs for using the feedback option.
Al.

[Al_The_Man]

i sort of figured that might be the case , heres one off the top of the ebay page [/url]

Forgot to mention, that one and many such cheaper ones designed specifically for T.M. operation are designed uni-directional.
It is marked CW rotation.
Al.