Question on buying this surface grinder

[DavidR8]

I didn’t know there was a difference between truing and dressing a wheel.

 

[Brento]

That is what i thought. Something i saw said trueing cleans up the wheel but you have to dress the wheel to wear away the bonding compound for the grit? I found it when i was looking up what a brake speed controller was.

 

[7milesup]

That is what i thought. Something i saw said trueing cleans up the wheel but you have to dress the wheel to wear away the bonding compound for the grit? I found it when i was looking up what a brake speed controller was.

Never heard of that (not that I know a heck of a lot about surface grinding) but I use a single-point diamond mounted in a block that is then held fast with the magnetic chuck. Once it is trued up with the diamond point, then it is time to start grinding. Any dressing seems to me like it could then alter your just trued-up wheel.

 

[Brento]

Never heard of that (not that I know a heck of a lot about surface grinding) but I use a single-point diamond mounted in a block that is then held fast with the magnetic chuck. Once it is trued up with the diamond point, then it is time to start grinding. Any dressing seems to me like it could then alter your just trued-up wheel.

That is what i thought and what i was taught.

This is the video i saw.

 

[Brento]

How much do you think this could weigh?

 

[7milesup]

How much do you think this could weigh?

If it is a DH612 it looks like it should be in the 885lb range. My 815 Bridgeport surface grinder is somewhere in that range too.

 

[Brento]

Ok thanks! Tmr is move in day!

 

[7milesup]

@Brento Wellllllll, we're waiting! Do you have a surface grinder or a hunk of scrap metal?

 

[Brento]

@7milesup i posted in the buy group about it but yes i do have a good looking grinder. Needs a little elbow grease but I believe she will be a fine machine for what i need. The electrical will be the biggest thing. I will prob buy the Teco vfd this weekend. Ill need to figure out what breaker size i will need for my panel box when i run the electric i know it will be a 220 just not sure on the amps. Also what kind of oil is needed in the oiler. It says something about pumping the oil before you start the spindle and every 15 minutes of use. She is home and in her resting place.

 

[7milesup]

Very nice! It looks like it will clean up nice, although it doesn't look bad the way it is.

The wire and breaker size is straightforward to calculate. Your spindle requires 2.7amps at FL (Full Load) and 230 volts. 14 gauge wire can handle 15 amps (actually 20, depending on temp) and 12 gauge has a 20 ampacity rating. The voltage when determining the ampacity capability of wire is irrelevant. In your case, I would run #12AWG with a 15 amp breaker. By running the 12awg wire it allows for "headroom" should you decide to do something different with that outlet. You will need a 3 wire conductor with ground so it will have a Black, White, Red, and either green or bare for ground.
Just remember that there is to be no switch between the VFD and the motor. The motor is run directly from the VFD. I have mine utilizing a soft start to slowly spin the grinding wheel up, which is a nice feature. Do not utilize any braking or you will find the grinding wheel across the shop when the nut unscrews itself.
The oiler is somewhat of a mystery to me. Mine has large oil wells with a wheel system to pull the oil onto the ways. Yours has a different system but for the same purpose. The motor is permanently lubricated according to the data plate, so nothing to do there. I use 80w-90 gear oil in mine with STP oil treatment added as a tackifier. One must remember that this is a manual machine and my arm will likely wear out before the ways do.