Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: truckeic on January 07, 2019, 12:00:32 PM

Title: Newbie here asking about why need REV on my mill
Post by: truckeic on January 07, 2019, 12:00:32 PM

Ok i am getting ready to add spindle control to my Harbor Freight Mill. I have looked into putting a REV function on it but cant really see why that would be a big deal or not. When i say big deal i mean using it... Are you folks tapping in CNC program? Tell me why i need the REV?

Title: Re: Newbie here asking about why need REV on my mill
Post by: joeaverage on January 07, 2019, 01:12:05 PM

Hi,
when I built my mill I shagged around putting a REV on it as well but never use it.

Unless you have left-handed tools or drill bits why bother?

If you are doing rigid tapping that's another ball game altogether I wouldn't bother with REV.

Craig

Title: Re: Newbie here asking about why need REV on my mill
Post by: BluePinnacle on January 11, 2019, 05:44:36 AM

same here, I did it all with relay logic and being 3-phase it was fairly simple. it's got a spindle brake and a timer so that I can program m3, m4, m3, m4 all day and it doesn't crash but I have never, ever used it in 15 years.
Edit: my 300th post, I should make a cake to celebrate :D

Title: Re: Newbie here asking about why need REV on my mill
Post by: truckeic on January 11, 2019, 08:40:39 AM

Thanks guys what i thought...

Title: Re: Newbie here asking about why need REV on my mill
Post by: jimthefish on January 11, 2019, 09:31:06 AM

I just use reverse for machine tapping with my tap holder.

Title: Re: Newbie here asking about why need REV on my mill
Post by: JohnHaine on January 21, 2019, 04:41:32 AM

I also regularly use reverse on my manual mill when machine tapping (which I do all the time).  Also there is a Hemingway design for a spindle speed increaser using an epicyclic gearbox which reverses so you need to run the mill in reverse to get correct spindle direction.  If you're using a VFD it's a simple low voltage control option, why not do it?