Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: trigger on January 09, 2007, 10:44:20 PM

Title: Screws for mounting motors
Post by: trigger on January 09, 2007, 10:44:20 PM
I hacked two motors out of an old CD player and I want to mount them to a U bracket (which I have yet to obtain). The screws it came with are too small to fit through both a washer and a bracket, so, how do I find longer screws to fit it? I don't have any tools to measure screw size. Are there standard screws for small DC motors? I looked on McMaster but that wasn't helpful--way too many options.   ???

Title: Re: Screws for mounting motors
Post by: Militoy on January 10, 2007, 12:44:55 PM
There are no "standard" screws used to mount motors (although from a CD player, it's likely you're dealing with a metric size) - you're just going to have to find a way to measure them. It shouldn't be all that hard, with a cheap pair of calipers (your best bet) or even a 6 inch steel scale. You should be able to pick either up for under $10. You can determine thread pitch by using a pitch gauge (maybe $3 for a Chinese-made one) If your budget won't allow for buying new tools, take the screw to a good hardware store close to your home, and see what nut will easily thread onto the screw you have. That will tell you the screw size and thread pitch - and you can pick up longer screws while you're there.