How to retrofit a brake on a band-saw?

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Forum topic by b2rtch posted 01-27-2014 04:05 PM 765 views 0 times favorited 3 replies Add to Favorites Watch
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4822 posts in 2473 days

01-27-2014 04:05 PM

Topic tags/keywords: question bandsaw

I posted on another post ( where we talk about retrofitting a brake on Grizzly band saws this idea:

“Another idea would be to have a temporary switch to reverse the current on the motor
As you hold the paddle switch to stop the saw, you send a current to the motor in the reverse direction to stop it, with 3 phases it would easy to do.
With one phase, I do not know but I am sure that it is possible”

Would it be possible to do just that?

Thank you.

-- Bert

3 replies so far

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883 posts in 1498 days

#1 posted 01-27-2014 04:38 PM

most single phase motors have a capacitor that starts the motor in the right direction and then a centrifugal switch takes the cap and start windings out of play. others have run caps that remain on the whole time. three phase has no caps and direction is determined by the phase direction of three inputs. braking is supplied by reversing the phases through a reversing switch and or contacter. this is hard on the contacts in either if used frequently and heat can build up in the motor as well if cycle times are short. Most equipment utilize a mechanical brake although it may be electrically activated. Vfds will reduce the current or induce a DC current to slow down the equipment faster but not immediately. if the brake time is set too short the drive will drop out and display a fault requiring a reset. this happens on my lathe with large pieces. to avoid the reset i disable braking and let it coast.

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3599 posts in 1911 days

#2 posted 01-27-2014 04:48 PM

Easiest way I have ever found to add an aftermarket brake is to do it like they did on the old Conestoga and freight wagons.
A piece of leather attached to a chunk of wood. The wood on a hinge with a spring to keep it pulled away from the pulley or wheel or belt, (wherever you want your brake). Attach with a string to a pedal you built on the floor.
When you step on the pedal, the brake “shoe” engages the contact point, slowing the saw quickly.

It’s kind of a ‘Oh, Duh’ fix, but it works quite well.

While I never did it on a band saw, I did make one for a round saw sawmill I worked at. It engaged at the flywheel of the arbor. It worked for a few years before the little piece of leather wore out.

-- Improvise.... Adapt...... Overcome!

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4822 posts in 2473 days

#3 posted 01-27-2014 04:51 PM

What about this?
Less cheezy

-- Bert

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