Mr Bridgeport
Stainless
- Joined
- Nov 27, 2002
- Location
- Burlington, NJ
I figured I would start a new post on my current issues. I have a post on here about my voltage conversion using Peter's setup with the transformer to boost the filament transformers and contact coil voltage. I worked through that and now seem to have the proper voltages to run the machine.
I cannot seem to get the drive to run stable at all. For now I am going to take the motor out of the equation as it looks like it was rebuilt shortly before I purchased the machine. The commutator looks very nice, the brushes look new and the inside of the motor was repainted with that red insulating paint that they use. In operation there is never any arcing or noise coming from the motor.
After getting the voltage conversion done I took some voltage readings. As of now, this is running on a single phase line.
L1 to L2 = 246VAC
Output of new transformer = 460VAC
Filament voltages on C16J = 2.45VDC
A29 to A30 checked at bottom of fuses = 621VAC
A24 to A25 = 308VAC
Output of EL1C measured at F2 to 73 = 119VDC
F1 to F2 with spindle running varies with spindle pot at crossover point = 111VDC to 43VDC
The machine pulsates badly and you can see it in the tubes as well. After I reach the cross over point and the field takes over, it seems to smooth out a lot better. The right C16J seems to be acting normally but the left tube only fires intermittantly. Swithing the tubes does not change the problem, left side is still intermittant. None of the relays are chattering or acting up. Contactors pull in very nicely.
http://i1277.photobucket.com/albums/y493/Coyotebill57Bill/IMG_1301_zps442877dc.jpg
Peter had suggested replacing the 8MFD 450V cap. I replaced that tonight with a 10MFD 450V cap, the closest I could get. Still has the same problem. There is an exploded cap that Peter found a match for, it's a 0.1MFD 600V. Problem is, I have no idea where the other end was connected or if it was added. The one end that is left with most of the body is soldered to the case of the 1MFD metal cap behind the front panel at the bottom. I seperated the front and looked carefully for hints of where the other end was. I could find nothing. Tying the cap to the body of the metal cap is basically tying it to chassis ground. I will try and post a picture. I need to know if anyone else has that cap in there system.
http://s1277.photobucket.com/user/Coyotebill57Bill/media/IMG_1310A_zps0675f38a.jpg.html
After replacing the 8MFD cap with the 10MFD cap I tried to do the drive tuning procedure that Monarch sent me. I hooked my meter to GA2 and S1 on the DC scale. I set all the pots to zero, full CCW. I set the speed control pot on the front of the lathe to the mid position and placed the lever into the forward position. At that point I'm supposed to adjust the Minimum Voltage pot to 98VDC. At full adjustment the voltage only comes up to 62VDC, spindle was running about 250 to 300 RPM and pulsating. Right tube was pulsating and left tube was doing nothing. I tried playing with the compensation pot, that brought up the voltage but it was pulsating so badly that I could not get a clear reading.
At this point I think I can say that the field is not the problem, the armature circuit is. I will not be able to get back to the shop till maybe Sunday or Monday but I need some help.
Thank you
Bill
I cannot seem to get the drive to run stable at all. For now I am going to take the motor out of the equation as it looks like it was rebuilt shortly before I purchased the machine. The commutator looks very nice, the brushes look new and the inside of the motor was repainted with that red insulating paint that they use. In operation there is never any arcing or noise coming from the motor.
After getting the voltage conversion done I took some voltage readings. As of now, this is running on a single phase line.
L1 to L2 = 246VAC
Output of new transformer = 460VAC
Filament voltages on C16J = 2.45VDC
A29 to A30 checked at bottom of fuses = 621VAC
A24 to A25 = 308VAC
Output of EL1C measured at F2 to 73 = 119VDC
F1 to F2 with spindle running varies with spindle pot at crossover point = 111VDC to 43VDC
The machine pulsates badly and you can see it in the tubes as well. After I reach the cross over point and the field takes over, it seems to smooth out a lot better. The right C16J seems to be acting normally but the left tube only fires intermittantly. Swithing the tubes does not change the problem, left side is still intermittant. None of the relays are chattering or acting up. Contactors pull in very nicely.
http://i1277.photobucket.com/albums/y493/Coyotebill57Bill/IMG_1301_zps442877dc.jpg
Peter had suggested replacing the 8MFD 450V cap. I replaced that tonight with a 10MFD 450V cap, the closest I could get. Still has the same problem. There is an exploded cap that Peter found a match for, it's a 0.1MFD 600V. Problem is, I have no idea where the other end was connected or if it was added. The one end that is left with most of the body is soldered to the case of the 1MFD metal cap behind the front panel at the bottom. I seperated the front and looked carefully for hints of where the other end was. I could find nothing. Tying the cap to the body of the metal cap is basically tying it to chassis ground. I will try and post a picture. I need to know if anyone else has that cap in there system.
http://s1277.photobucket.com/user/Coyotebill57Bill/media/IMG_1310A_zps0675f38a.jpg.html
After replacing the 8MFD cap with the 10MFD cap I tried to do the drive tuning procedure that Monarch sent me. I hooked my meter to GA2 and S1 on the DC scale. I set all the pots to zero, full CCW. I set the speed control pot on the front of the lathe to the mid position and placed the lever into the forward position. At that point I'm supposed to adjust the Minimum Voltage pot to 98VDC. At full adjustment the voltage only comes up to 62VDC, spindle was running about 250 to 300 RPM and pulsating. Right tube was pulsating and left tube was doing nothing. I tried playing with the compensation pot, that brought up the voltage but it was pulsating so badly that I could not get a clear reading.
At this point I think I can say that the field is not the problem, the armature circuit is. I will not be able to get back to the shop till maybe Sunday or Monday but I need some help.
Thank you
Bill
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