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[4]

Electric brake

January Project of the Month [3]
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Mikelkie

Iron
Registered Member
Joined
Nov 19, 2017
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35
#1
I was getting tired of stopping the drill by hand or wait for it to stop by itself
to change from drill bit to a tap.
So i build and fitted a dc electric brake and foot switch. It stops almost immediately now
and a pleasure to use with both hands free.
 

Bob Korves

H-M Supporter - Sustaining Member
H-M Supporter - Sustaining Member
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Jul 2, 2014
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#3
I was getting tired of stopping the drill by hand or wait for it to stop by itself
to change from drill bit to a tap.
So i build and fitted a dc electric brake and foot switch. It stops almost immediately now
and a pleasure to use with both hands free.
Tell us more. Pics, too.
 

Mikelkie

Iron
Registered Member
Joined
Nov 19, 2017
Messages
13
Likes
35
#4
The wiring consists of two contactors each with two sets normally closed (n/c) auxiliaries to avoid the closing of a contactor whilst the other one is closed. ie. electrical interlock
The second set of n/c aux. is to close the brake contacor to inject a dc current into the
running winding of the motor, supplied by a transformer and bridge rectifier.
The timer is set to energize the brake cotactor for the period needed to stop the motor. I also included a foot switch forward and reverse then it leave both hands free
to locate drill points etc. I hope the diagram is legible. I will answer any question where
possible. Thanx for the interest shown
Mike SAM_1044.JPG SAM_1046.JPG
 
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