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My Model 5 again
Posted: Tue Jun 03, 2008 12:30 am
by pyramid head
This time in attack for a short 3 cycles, my Model 5 roars in the back of my pickup. I want some opinions on this, towards the end of the video a sound can be heard coming from the motor. I really have concern for this, and I am willing to bet it is not siren friendly. If the verdict is bad, I will have to re-tap the rotor holes to pull the rotor.
http://www.youtube.com/watch?v=r1vbM5K9nNY
Posted: Tue Jun 03, 2008 1:51 am
by Corey Hudson
I cannot really tell what is wrong, the youtube video is too compressed. If you put the audio on putfile or something i can give it a check.
Posted: Tue Jun 03, 2008 4:53 am
by Archon
Is it single phase? if it is could be the brushes you are hearing.
Posted: Tue Jun 03, 2008 5:06 am
by murrfarms
Archon wrote:Is it single phase? if it is could be the brushes you are hearing.
Yes, his is single-phase. None the less, it sounds great!
Re: My Model 5 again
Posted: Tue Jun 03, 2008 11:21 am
by ver tum
I do hear some motor noise towards the end of the wind-down, but I've heard other sirens that were noisier than this one. I can hear a very similar noise sometimes on one of my electric fans, but the fan runs fine. Some motor oil couldn't hurt though.
Posted: Tue Jun 03, 2008 11:28 am
by Mr. Machine
If you slide the Play cursor back and forth between 0:10 and 0:40, you can see the siren rotate in place.
Posted: Tue Jun 03, 2008 11:34 am
by ver tum
Mr. Machine wrote:If you slide the Play cursor back and forth between 0:10 and 0:40, you can see the siren rotate in place.
That could explain the noise. The siren may not be sitting completely level in the back of that truck. I've noticed that if some electric motors are even slightly unlevel, they can make that sound.
Posted: Tue Jun 03, 2008 7:50 pm
by pyramid head
I am afraid it is not as simple as the unit sliding in the bed of my truck. I can hear a very distinct clicking sound from it. A brush is what I was thinking, but why would it click like that? I have spun a few brushed motors before and they do not really click like that.
Posted: Tue Jun 03, 2008 8:27 pm
by JasonC
All of my model 2's have made that noise. I think mine was in the bearings, although it could be the brushes in yours. You have a 40+ year old giant piece of metal spinning a close tolerances, its going to make some noise of some sort (and of course you still haven't refurbished the inside yet)
Posted: Tue Jun 03, 2008 10:10 pm
by holler
pyramid head wrote:I am afraid it is not as simple as the unit sliding in the bed of my truck. I can hear a very distinct clicking sound from it. A brush is what I was thinking, but why would it click like that? I have spun a few brushed motors before and they do not really click like that.
Both of the motors in my Model A's click if you turn them by hand.
I think you are worrying too much, the siren sounds fine. Anything that old is not going to be smooth as silk.