I noticed a spark came off where the cut out attaches under the screw on generator. What is causing that?
Announcement
Collapse
No announcement yet.
Cut out
Collapse
X
-
Comment
-
Originally posted by Beauford View PostThis is what I have...
With that much pitting, I hope the rough pulley doesn't chew up your V belt.
Comment
-
Pulley is good...if you remember when I started this journey it had been out in the elements for 60 some years in the woods. And yes, after a rebuild it works. Reads 10 on plus side when running.
Comment
-
sounds like another tech article is coming
Comment
-
This is another great write up i had saved from Tom W...
. i think it would make a good addition to the tech forum
"QUOTE"
Generator Brushes and Adjustment and How It Works
I'm asked quite often about brush adjustment and how they work, so hopefully these pictures will help.
The first picture is a cutaway taken at the Model A museum at Gilmore Auto Museum in Hickory Corners, Michigan. The second picture shows the 3 brushes. This happens to be the style with a ball bearing in the rear, as used until about March 1930. At that time the bearing was changed to a bushing and the output stud was moved from the front of the case to the rear.
The brush on the left is the output ground brush and has no insulators on the brush holder.
The top brush is the adjustable brush (third brush) and it sets the generator output amperage.
The brush on the right is the output brush and connects to the output stud in the generator case.
Notice all 3 brushes have a long and short side, and the short side is always closest to the brush holder pivot post.
Also notice the adjustable field brush is thinner than the 2 output brushes.
The adjustable brush connects to the field windings, and the other end of the windings is connected to ground. So, consider the ground brush as 0 potential and the output brush as 6 volts potential. Now you can see that as you move the adjustable brush (field brush) closer to the output brush, you will increase the voltage feeding the field coils. This will increase the magnetism of the field poles, which increases the generator output.
So, you can see this also becomes a runaway situation. As the field gets stronger, the output increases, and this also increases the output to the adjustable brush, and it becomes a vicious circle. However since the output is connected to the 6 volt battery, this keeps the output under control. If you have a poor connection in the charging circuit, then the battery is no longer connected and the voltage can rise to as high a 40 volts. This can smoke the field windings and cook the armature. If the lights are on they will also burn out.
With the generator on the car, as you face it from the front of the car, the adjustable brush will be about in the 2 o'clock position. Moving the brush UP lowers the output, and of course moving the brush DOWN will increase the output. For most daytime driving a couple amps should work fine. The more amps, the more the water is evaporated from the battery. If you do a lot of starts and short drives, or night drives, then you will need to move the brush down for more output.
This picture shows too much grease for the rear bearing, and I removed about half of it before the final assembly. I also put a thin coat of grease on the adjustable brush ring and 2 tension holders, and a drop of oil on each of the 3 brush pivot posts.You do not have permission to view this gallery.
This gallery has 2 photos.
Comment
Related Topics
Collapse
-
by Bill in NJI have a new regulator that has the cover off of it. It can go two ways. Does it make a difference ? It is the point style. Looks like there is to tab to to connect to the post coming out of the top of generator. Thanks in advance !!
...
-
Channel: Model A Forum
09-08-2017, 09:43 PM -
-
by smittykidI'm running a 6 volt generator on a pos. ground system. I was afraid the old cut out was over charging the battery. I replaced the old cut out with a new NUREX semi-conductor cut out. At regular idle the amp meter shows about 5-6 amps of charge. Running down the road- 40mph it shows around 12 amps charge. No lights on. What is the correct charge rate? Maybe the old cut out wasn't bad after...
-
Channel: Model A Forum
08-17-2017, 11:28 AM -
-
Over the years generators have been swapped on the Model A's, so now days you can normally have 1 of 4 different styles. First came the 5 brush powerhouse, then the 3 brush powerhouse, then the long generator known as the Autolite style. After Model A production ended and the Model B began, the generator also changed slightly, and now many B style generators can also be found on the Model A. People...
-
Channel: Model A Forum
01-03-2018, 03:00 AM -
-
All Model A fine point cars that I've observed (post Powerhouse gennies, 1929-1931) have the output post on the generator towards the 'back', away from the front of the car. Seems like I've been noticing more Model A's anymore that have the long Autolite generator with the output post on the front near the radiator, so the cutout relay is mounted 'backwards'.
I realize that the generator...-
Channel: Model A Forum
09-28-2017, 12:23 PM -
-
by MitchGenerator Brushes and Adjustment and How It Works.
By :: Tom Wesenberg
I'm asked quite often about brush adjustment and how they work, so hopefully these pictures will help.
The first picture is a cutaway taken at the Model A museum at Gilmore Auto Museum in Hickory Corners, Michigan. The second picture shows the 3 brushes. This happens to be the style...You do not have permission to view this gallery.
This gallery has 2 photos.-
Channel: Electrical Reference
05-19-2017, 09:51 PM -
-
by Fred SI installed what is supposed to be a newly rebuilt generator. I flashed it. Then attached an on off switch between the generator and the wire that goes to it. Started the car with the switch off, and the ammeter showed zero. Turned on the switch, and the ammeter shows minus 10 with the engine running. I took off the belt and turned on the switch and the generator motors slowly in the correct direction...
-
Channel: Model A Forum
05-30-2018, 03:16 PM -
-
by SeaSlugsI have 2 of these cutouts on some model A generators. Both are Ford script and one has a stamped B (not sure on other) I read the JS and they say all model A cutouts had slotted mounting tabs - these 2 do not. So what are they to? Model B's? Sure are heavy....You do not have permission to view this gallery.
This gallery has 4 photos.-
Channel: Model A Forum
08-18-2018, 05:46 PM -
-
by ClaudeCCan an antique 1933 Generator cutout still function? Or is it a better idea to purchase a new manufactured one?
-
Channel: Early V-8 Forum
01-02-2018, 03:16 PM -
-
by Chevmn56Started putting the generator back together after detailing it, correct bolts etc i bought a Generator pulley bolt from Brattons, the description says that the 30-31 generator takes the big headed black bolt and black star washer......but in trying to put the pulley back on with the new bolt and washer, the bolt isn't long enough. The generator i rebuilt is period correct for the A ......is there...
-
Channel: Model A Forum
01-26-2018, 03:56 PM -
-
I'm working on a generator that needs to be restored. Mention was made about a bearing noise, but there was no mention of no output, so I assumed it worked OK. The first thing I check was the cutout, and find the input terminal shorted to ground. It looks like a homemade bracket with just a small thin piece of black plastic that looks like a tiny piece off a TV dinner. You can see the bracket is bent...You do not have permission to view this gallery.
This gallery has 3 photos.-
Channel: Model A Forum
03-09-2018, 01:29 AM -
Unconfigured Ad Widget
Collapse
Comment