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Adding an electronic brake to a shaper...1/28/14
I have an older Italian shaper that I'm thinking about adding an electronic brake to. I looked at the "Short Stop" website, but it seems like you have to call to get any real info. Right now I'm just trying to get a grasp on the basics of motor braking BEFORE I talk to the sales guy! What do I need to know before I open my wallet. Also any feedback on brands, types, etc, etc,.
Oh and FWIW it's an 8 hp motor running on 220v.
Many off the shelf motor drives can do this plus more. Ramp speed up, down, variable speed, reverse, ect.
Short Stop essentially takes the 3 phase voltage going to your motor and upon hitting the stop button applies DC voltage across 2 of the legs turning it into a momentary electromagnet. There are adjustments in the box for timing parameters. You wouldn't want to use this on anything that the momentum of the cutter could unscrew the arbor nut. Not an issue with the shaper.
Finally talked to Short Stopů.they don't make a break for this (Delta config) motor. Ahhh well, have to run without I guess.
What kind of catastrophe are you hoping to avert with a brake stop? I doubt that's going to be practical.
I do have a brake handle on an old frequency router motor because it fly-wheels for some time after switches-off. Belt-driven machines however, won't coast very far.
What's the point?
Not trying to avoid a catastrophe as much as would like to have a short run down time. On big shapers running large cutter heads I like to be able to bring them to a stop quickly if/when necessary. Many large shapers feature a mechanical brake which once you get used to it's hard to work without. Especially when you might have to do a couple test cuts before getting it just right;>)
My SCMI T-110 has a foot brake and I can't imagine what it would be like not to have that convenience. I never considered what it would be like having to wait for the machine to coast to a stop. Not a very efficient way to have to operate.
My very old 37" Timesaver has an automatic brake that I find somewhat unconventional but which works very well. The braking action is nothing more than an air cylinder activated pressure plate with a block of wood on the face. As the machine begins to coast to a stop the air cylinder activates and presses the wood block against one of the pulleys.
Perhaps you could construct a lever action mechanical brake for the shaper using the simple wood block technology. Or if you really want to get technical with it design and build an air activated brake like on the Timesaver. A few mounting brackets, relays and solenoids should do the job if the pulley is positioned right.