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Author Topic: Harbor Freight Mini Mill Relay Spindle Motor  (Read 1198 times)

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Harbor Freight Mini Mill Relay Spindle Motor
« on: March 21, 2017, 03:59:30 PM »
I am sure this has been done but wondering if any of you guys could tell me if i were to put a relay in series with the DC Motor would MACH3 turn the relay off and on. I assume its a 5 V from MACH3.
Has anyone tried this with a X2 Mill?

Offline Tweakie.CNC

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Re: Harbor Freight Mini Mill Relay Spindle Motor
« Reply #1 on: March 22, 2017, 03:09:00 AM »
Quote
if i were to put a relay in series with the DC Motor would MACH3 turn the relay off and on

You would need a relay which has a coil capable of handling the current of the DC motor.

Quote
I assume its a 5 V from MACH3.

Not sure what you mean by this ???

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Harbor Freight Mini Mill Relay Spindle Motor
« Reply #2 on: March 22, 2017, 11:14:01 AM »
Hi,
I'm guessing you want Mach to turn a relay on and off and the relay turn the spindle on and off?

Mach doesn't have a voltage per se....but the BOB does. Many BOB's are 5v so it could turn a 5V coil relay on and off.
Note also that most BOBs have fairly limited current output, commonly 20mA or less. Your 5V relay will have to be
pretty small and therefore the output contacts may not last long when switching spindle current.

To improve that situation you can use a small 5V relay to control a bigger relay or contactor. Another way is to use a transistor
with the base controlled by the BOB but the collector/emitter circuit controlling a much larger relay than the BOB could handle
on its own.

Craig
My wife left with my best friend...
     and I miss him!
Re: Harbor Freight Mini Mill Relay Spindle Motor
« Reply #3 on: March 22, 2017, 11:25:26 AM »
There are some decent low current trigger relays around where the trigger is very low current, but the coil is powered by a direct connection to a power supply.  Unfortunately those I am aware of are 12V not 5V. 
Re: Harbor Freight Mini Mill Relay Spindle Motor
« Reply #4 on: March 22, 2017, 01:41:18 PM »
Thanks for the info..
Does anyone know how much voltahe current the motor draws
Re: Harbor Freight Mini Mill Relay Spindle Motor
« Reply #5 on: March 22, 2017, 02:14:00 PM »
Hi,
should be written on the motor or at least in the docs that come with the machine.

Craig
My wife left with my best friend...
     and I miss him!