Hi,
I have a small (5.5" centre height) Boxford AUD Mk III lathe and have connected it to an IMO I-DRIVE inverter.
The motor is a standard british, Brook Cropmton Parkinson motor. The image attachment link on this web site doesn't seem to be working so here is the motor plate info :-
Model number = V (or could be W)MA544CM1B (spares CAD No 2-V
Wo = 550
R.P.M. 1425
Star V = 380/440
Star A = 1.5
Delta V = 220/240
Delta A = 2.6
Insulation class = E
Phase = 3
Hz = 50
Rating = (looks like it says) CP
It is wired in delta to work from U.K. mains supply i.e. 240V 50Hz
The problem that ever since I got this lathe it is that particularly in the highest belt speed (which gives 1400 r.p.m.) the machine vibrates a lot (much worse on the headstock), and makes a strange low frequency drone that comes in and out in loudness, but is always there; As the speed is reduced, the vibration varies a bit but never is less than objectionable as does the low frequency sound.
I have tried all ways to remove this vibration and sound, and have replaced the pulley bearings (they were worn out anyway) which made only a very slight difference, and changed the belts for different types which did make a difference in that the fenner belts sounded worse than the originals and the toothed v-belts I tried that are more flexible lessened the sound quite a bit, but none removed the vibration.
I did find that removing the equipment door considerably quietened the sound, but this was the right-hand door and the left-hand door (the one in front of the motor), made no difference.
I also found that the headstock was not the cause as I removed the brammer belt but the vibration still existed.
I found that if I slackened the belt off from the first stepped pulley to the counter-shaft, the vibration decreased but then it did not have enough grip to work properly.
Could this be as a result of using an inverter, or could it be a mechanical problem ?
The vibration is such that it is not comfortable to touch the machine (i.e. the cross-slide or top-slide handles), for any length of time.
The machine is bolted to a specially made, level, concrete pedestal.
Any help would be very much appreciated.
Thanks.
I have a small (5.5" centre height) Boxford AUD Mk III lathe and have connected it to an IMO I-DRIVE inverter.
The motor is a standard british, Brook Cropmton Parkinson motor. The image attachment link on this web site doesn't seem to be working so here is the motor plate info :-
Model number = V (or could be W)MA544CM1B (spares CAD No 2-V
Wo = 550
R.P.M. 1425
Star V = 380/440
Star A = 1.5
Delta V = 220/240
Delta A = 2.6
Insulation class = E
Phase = 3
Hz = 50
Rating = (looks like it says) CP
It is wired in delta to work from U.K. mains supply i.e. 240V 50Hz
The problem that ever since I got this lathe it is that particularly in the highest belt speed (which gives 1400 r.p.m.) the machine vibrates a lot (much worse on the headstock), and makes a strange low frequency drone that comes in and out in loudness, but is always there; As the speed is reduced, the vibration varies a bit but never is less than objectionable as does the low frequency sound.
I have tried all ways to remove this vibration and sound, and have replaced the pulley bearings (they were worn out anyway) which made only a very slight difference, and changed the belts for different types which did make a difference in that the fenner belts sounded worse than the originals and the toothed v-belts I tried that are more flexible lessened the sound quite a bit, but none removed the vibration.
I did find that removing the equipment door considerably quietened the sound, but this was the right-hand door and the left-hand door (the one in front of the motor), made no difference.
I also found that the headstock was not the cause as I removed the brammer belt but the vibration still existed.
I found that if I slackened the belt off from the first stepped pulley to the counter-shaft, the vibration decreased but then it did not have enough grip to work properly.
Could this be as a result of using an inverter, or could it be a mechanical problem ?
The vibration is such that it is not comfortable to touch the machine (i.e. the cross-slide or top-slide handles), for any length of time.
The machine is bolted to a specially made, level, concrete pedestal.
Any help would be very much appreciated.
Thanks.