I'm trying to get a cheap pull-type solenoid that can operate for at least ten seconds at a stretch to serve as an electronically-controlled ward in a lock (for a wooden box) I'm building.
I'm a novice and confused at my findings. Can anyone enlighten me?:
This model touts a stroke length of 0.05 inches. Does that really mean that the shaft only retracts 5 hundredths of an inch?
What's a "nominal" stroke? How is it different from a maximum stroke? (I'm looking at the table on this page.)
If max stroke is specified but nominal stroke is listed as n/a, does that mean that nominal stroke length is 0?
Lastly, any counsel on where to shop for the solenoid I need? I want a retraction of about 1/8 inch but could just as easily make use of 1/2 inch.
TMI: My shopping criteria:
- cheap
- small
- >= 1/8" stroke length
- DC
- <= 12V
Best Answer
If it says the stroke length is .05 inches, then you have to assume the stroke length is .05 inches (50 mils). There is nothing ambiguous here.
The nominal versus maximum stroke is less clear. It appears they are rating the solenoid for pulling in the nominal amount, but are saying that it can actually start further out. That will likely mean significantly less starting force, though. They are saying that this solenoid is meant to be used so that it is held the nominal distance out, but that it can mechanically go further. However, it's hard to trust what they say when the starting force is labeled in Ohms. Huh? I'd seriously wonder what else is wrong with that datasheet. I'd find a different solenoid, preferably from a different manufacturer.