Bridgeport Series II

[BruceP]

We have a Bridgeport series II Boss 5 cnc converted to run Greecko box, our Y-axis motor went out and found a used motor (p/n 025805) and installed it. We have tried the motor and it will run for a quarter turn then stop..we have the jog set to move 1 inch on the Y-axis but but it barely moves the belt pulley only moves 1/4 turn. Also does the motor also act as a brake because once it tries to turn it locked up like the motor is trying to turn both directions, feels that way also. So i guess my question is what could be going on ..like bad encoder...or controller.

The old motor would run but the output shaft wont turn.

Thanks in advance..

[machintek]

No encoders on a BOSS 5 unless someone installed them. And a whole new control that uses them
What do you mean that the old motor would run but the output shaft would not turn?
These are stepping motors. If a output transistor is shorted, it will whine as the motor oscillates between poles but the shaft does not turn.

George

[BruceP]

Well maybe that transistor whine is what we heard on the old motor, but it sounded like the motor ran. The 025805 motor has 8 wires and I was under the impression that it had end coders from what I was told.

The motor we have now we bought used and like i said it tries to run but not long enough for the Y-axis to travel an inch when hitting jog button. Even took the drive belt off and motor only turned about 1/2 a turn and you couldnot turn the motor pulley by hand untill shut the machine off.

[machintek]

Check output transistors.

George

[keebler303]

What is a Greecko box? Do you mean Gecko? If so, the output transistors are not to blame.

A better description of the hardware you are using would be helpful.

Matt

[BruceP]

The motor we took out was confirmed dead by a motor motor repair shop..was not repairable.

Thats why i asked if the was anything else that could of been burned out from old motor.

I,m not familiar with how to check transistors on the motor.

[keebler303]

WHAT IS A GREECKO BOX??

The motor is a stepper motor, it does not have an encoder. The transistors are in the electronics of the machine, not the motor.

If the old motor shorted, it could have blown one or more transistors in the original stepper motor drive. This is assuming you are using the original drives. If a transistor is blown, the new motor will not work until the transistor(s) is replaced. The transistors are mounted in fours on the big black heat sink on the back of the control cabinet. There are dozens of threads describing how to find the transistors and check them here. Make an effort to search the forum and then ask questions to help you along. It helps to answer the questions of folks trying to help you!

Search for:
BOSS transistors
2N6547

I have posted in multiple threads so you could search my name on here.

Matt

[BruceP]

WHAT IS A GREECKO BOX??

The motor is a stepper motor, it does not have an encoder. The transistors are in the electronics of the machine, not the motor.

If the old motor shorted, it could have blown one or more transistors in the original stepper motor drive. This is assuming you are using the original drives. If a transistor is blown, the new motor will not work until the transistor(s) is replaced. The transistors are mounted in fours on the big black heat sink on the back of the control cabinet. There are dozens of threads describing how to find the transistors and check them here. Make an effort to search the forum and then ask questions to help you along. It helps to answer the questions of folks trying to help you!

Search for:
BOSS transistors
2N6547

I have posted in multiple threads so you could search my name on here.

Matt

Thanks Matt

Gecko i guess i hit the (r) when i posted..lol

[keebler303]

In that case, the output transistor issue is not relevant. That pertains only to the original stepper drives.

What software are you using? Mach3?
Which Gecko drives are you using? G203V, etc.
Did the machine ever run correctly on the "Gecko Box" or is this a new modification?

Matt

[BruceP]

In that case, the output transistor issue is not relevant. That pertains only to the original stepper drives.

What software are you using? Mach3?
Which Gecko drives are you using? G203V, etc.
Did the machine ever run correctly on the "Gecko Box" or is this a new modification?

Matt

My bad Matt..i was wrong on spelling again...ugh or misunderstood when info was relayed to me...its Greco systems...which i believe its referencing to floppy drive.

The unit is all bridgeport original stepper motors and controls as far as we know it has the 025805 stepper motors on it.


I posted yesterday from home while sick and was relayed info over phone to make my post.

sorry about confusion.

Thanks Bruce

[keebler303]

OK Bruce

We are back to post #7.

Search and read.

Additionally, if the motor shop told you your stepper had an encoder, I am not sure that I would trust them to say the motor was dead. Did they even know it was a stepper motor? It is possible for the motor to fail and kill the transistors but it'd be much more likely that the transistors failed due to age or something and gave the appearance that the motor was not working.

Matt

[BruceP]

I can not turn my motor once its been activated or after i try to run it...before trying to run it i can turn it...i read somewhere where you said the transistors should be ok then? if i read it right...


Oh by the way is this what im looking for