I picked up this 8 lb DC motor last Saturday at the junk shop. Should have plenty of low speed torque. Just reverse polarity to get it to spin backward for unwinding mistakes.
At first, I brought a smaller one up to the counter without a price tag and asked for a price. In order to get a ballpark figure, the manager went and got this guy shown below to compare with. The first motor was $45 and had no pulley or gizmo on the tail shaft. The second one for $65, had a 40 tooth belt pulley, and the gizmo on the tail shaft, and a mounting bracket. After thinking for a while, I decided to upgrade. The pulley can drive a mechanical counter, via a toothed belt, which is the way to go, since it won't need pain in the rear software and electronics to tell it which way is forward and which was is reverse, like an LCD display counter would. Also immune to power failures/glitches etc.
The gizmo on the end is an encoder. It puts out two square waves at 90 degrees to each other so you can sense motor direction, 1250 waves per revolution, which I think works out to 8 bits or close. Optical gradient wheel and led inside.
Speed control will be a variac into a big dc bridge, no filter caps needed.
I don't need a fancy servo system to ramp the motor up and down, and telling it when to stop. Maybe later on I can add this, but trying to keep it simple right now.
Anyway, I have the counter figured out, and I am going to buy a 10:1 precision lead screw for the wire traverse. The encoder will be perfect for driving the stepper motor that turns the lead screw.
I was hoping someone at the forum might have some experience in motor controls so they could tell me what I need in between the stepper motor on the lead screw and the encoder. I will need to tell the stepper motor how fast to click in relation to the wire size I am using. What do I need to do this?
Thanks for any help!
http://vacuumbrain.com/The_Lab/Winder/wind_1.jpg
http://vacuumbrain.com/The_Lab/Winder/wind_2.jpg
At first, I brought a smaller one up to the counter without a price tag and asked for a price. In order to get a ballpark figure, the manager went and got this guy shown below to compare with. The first motor was $45 and had no pulley or gizmo on the tail shaft. The second one for $65, had a 40 tooth belt pulley, and the gizmo on the tail shaft, and a mounting bracket. After thinking for a while, I decided to upgrade. The pulley can drive a mechanical counter, via a toothed belt, which is the way to go, since it won't need pain in the rear software and electronics to tell it which way is forward and which was is reverse, like an LCD display counter would. Also immune to power failures/glitches etc.
The gizmo on the end is an encoder. It puts out two square waves at 90 degrees to each other so you can sense motor direction, 1250 waves per revolution, which I think works out to 8 bits or close. Optical gradient wheel and led inside.
Speed control will be a variac into a big dc bridge, no filter caps needed.
I don't need a fancy servo system to ramp the motor up and down, and telling it when to stop. Maybe later on I can add this, but trying to keep it simple right now.
Anyway, I have the counter figured out, and I am going to buy a 10:1 precision lead screw for the wire traverse. The encoder will be perfect for driving the stepper motor that turns the lead screw.
I was hoping someone at the forum might have some experience in motor controls so they could tell me what I need in between the stepper motor on the lead screw and the encoder. I will need to tell the stepper motor how fast to click in relation to the wire size I am using. What do I need to do this?
Thanks for any help!
http://vacuumbrain.com/The_Lab/Winder/wind_1.jpg
http://vacuumbrain.com/The_Lab/Winder/wind_2.jpg