Grizzly G0779 Gearhead drill press rewiring

[psacustomcreations]

I have this new gearhead drill press at work. It works fine but the way the barrel switch is wired seems backwards to me.

Is there an easy way to reverse the wiring?

Trying to change the wires on the barrel switch seems a bit harder than changing the wires at the motor.

Can I just move the V1,V2, U1,U2 wires in the box near the motor to change the direction?

If so, any suggestions?









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[mla2ofus]

If it's 3 phase just switch two wires at the breaker panel unless there's other motors on the same circuit then don't as they'll then run backward. Better get someone qualified to do it at the drill so the smoke don't leak out.
Mike

[psacustomcreations]

It is single phase 220

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[filetobeef]

did you check in both high and low gear? some machines spin in reverse in one of the speeds.
but yes,you should be able to do it the motor.

[ronsii]

Is there a manual available for it? I have seen quite a few grizzly manuals and they are great when it comes to schematics...

***DANGER***This is just a guess!!! so don't do it unless you check the switch with an ohm meter FIRST to confirm operation of the poles!!!!! My guess is switch the U's 1 with 2 , 2 with 1 and the V's same thing....

[BrooklynBravest]

I felt it was backwards as well.

But i just got used to it. It’s muscle memory now.

[psacustomcreations]

I felt it was backwards as well.

But i just got used to it. It’s muscle memory now.

Yesterday I used it for a couple of hours turning it on and off repeatedly as I was milling the discs, so it pretty much became muscle memory. I saw you had the same thoughts initially in your thread on the switch but was not sure if you had tried to change anything.

[danielplace]

Flip the switch handle over if it will and almost accomplished the same thing unless it is keyed to that position which it may be.

I guess though it isn't even the markings you want fixed but rather clockwise on switch equals clockwise on the quill.


Did it come with a schematic. Check out what the drum switch is doing thoroughly first. Sure don't wanna fry something.

[FHJ]

Hi newbie here and found this thread. I have the same model and am hoping there is an answer one day. Thanks all.

[danielplace]

If you have a motor wiring schematic I can help you out no problem but you need that to be certain of the changes needed to get it flip flopped.

I did find it but it only shows how to wire what is exactly there. The motor wire to proper switch connections but not actual connection needed to compare the forward to reverse actual wiring and without knowing that drum switch I don't want to say do this and it is wrong. I will study it further and see if maybe enough clues to be pretty certain I will post.
Here is the diagram. I do a lot of electrical motor controls but not enough often enough to know the wiring inside out. Someone even more adept to the standard drum wiring and switching of single phase motors that are reversible. I do more 3 phase but have done a bit of the smaller stuff that is single
phase.

I am 90% sure you want to flip flip U1 with V1 and flipflop U2 with V2. That is different than the U1 flipping with U2 and V1 and V2 flipped flopped that was suggested. Still a guess.

[ronsii]

Yep, simple if you have a schematic handy like I said earlier.. probably just a v's and u's swap... but without it in front of me to verify where the wires go or at least verify the switch poles I can't guarantee it

[danielplace]

Yep, simple if you have a schematic handy like I said earlier.. probably just a v's and u's swap... but without it in front of me to verify where the wires go or at least verify the switch poles I can't guarantee it

Found it sorta but not with what connections it is really making but the layout may suggest what it is. What do you think after looking at what I posted. That is for that machine. You still have to make a guess. That is only making it slightly more educated but still no way to positively confirm from it.

It may in fact be your earlier suggestion too flipping the U's 1 & 2 and then the V 1 with 2.

[ronsii]

Found it sorta but not with what connections it is really making but the layout may suggest what it is. What do you think after looking at what I posted. That is for that machine. You still have to make a guess. That is only making it slightly more educated but still no way to positively confirm from it.

It may in fact be your earlier suggestion too flipping the U's 1 & 2 and then the V 1 with 2.

I might see if I can find a better res pic of that... it's a bit hard for me to see the tags..

I see they have line1 hitting 5,7,9,11 of the spindle switch and line2 hitting 1 and 3 which also jumps to the motor(common coil) so you can also see the criss-cross on 2-12,4-10 and 6-8(straight) so the 2-12 and 4-10 are where the flipping goes on but I can't quite read the tags for those posts


Ie... just switch wires on post 2 and post 10 of the spindle switch... I think

[danielplace]

I might see if I can find a better res pic of that... it's a bit hard for me to see the tags..

I see they have line1 hitting 5,7,9,11 of the spindle switch and line2 hitting 1 and 3 which also jumps to the motor(common coil) so you can also see the criss-cross on 2-12,4-10 and 6-8(straight) so the 2-12 and 4-10 are where the flipping goes on but I can't quite read the tags for those posts


Ie... just switch wires on post 2 and post 10 of the spindle switch... I think

Scroll to page 39

https://cdn0.grizzly.com/manuals/g0779_m.pdf

What you said is correct I believe. Flipping 2 and 10 on the switch should do it. There is actually several ways there with those that you could move stuff and accomplish the same but I believe those are easiest without further thought.

Pretty sure that swap couldn't let out the smoke even if somehow it was not the answer. I think you got the easiest way figured man.

[ronsii]

Yes, much better pic thanks... and yes pretty sure 2X10 flip will do it as the way the caps and everything else is wired show it is a common center coil on the motor.



** Unless the spindle switch is really weird on the inside

[OPUS FERRO]

psacustomcreations

I have this new gearhead drill press at work. It works fine but
the way the barrel switch is wired seems backwards to me.

Is there an easy way to reverse the wiring?

Trying to change the wires on the barrel switch seems a bit
harder than changing the wires at the motor.

You have received solid info . . . the nob swap - is my front
runner . . . if the nob is keyed and won't swap . . . Plan B -

There has been mention of Muscle Memory, and 'it is no longer
a problem' . . .

You do not want to 'hone/develop' - Muscle Memory on a non-
standard machine . . .

This could lead to serious accidents as you acquire more power
tools that are Standard Throw.

Life-long safety - is the paramount reason to change your Throw -

I'd rewire the switch: not the motor - in shop/field modifications
you alter the peripherals - not the heart - and tuck a note in the
switch-can telling all, what you have done . . .

To confirm your understanding of the schematic - test with a VOM.

First - test for the hot lead in the switch -

Unplug your drill - set VOM on ohm setting [Omega] - test from
the Hot terminal to the Forward/Back terminals - the VOM will
squeal upon circuit - then reverse the the contacts . . .

I would hook-up one rewire at a time, test - then disconnect and
test the other . . . this should avert smoke . . .

I have a client that has this machine - I'll look at it tomorrow -

hth


Opus



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