Learning the art of surface grinding

Janderso

Janderso

Jeff Anderson
H-M Platinum Supporter
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Mar 26, 2018
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I’m making these chuck stand offs, as you can see, the finish quality is quite different.
All I did was dress the wheel. I don’t understand why I get the oscillating pattern.
It goes away after I dress.
Tomorrow I’m going to try a different wheel.
This is an open grain 46 J Radiac. Red.
I have a white 46 H I’m going to try, I’ve had spectacular finishes with that wheel.
This is annealed 4140. I’m going to harden when complete.
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Wish that I had a decent chuck with slots to utilize those.
Is that a 6-Jaw?
 
Why grind and then harden? You will need to polish them after hardening anyway to get the discoloration off so if you wait you can use the grinder to polish them up. May even get a better surface finish on them after hardened.
 
Ok, good ideas.
I thought it best to finish the part before hardening.
Leaving the surface finish after milling was not acceptable.
Maybe I should re-think that.
I still need to drill and tap the locking set screw for the adjusting bolt/screw.
I Haven’t decided what to do with the finish after hardening.
Bluing maybe?
 
Janderso said:
Ok, good ideas.
I thought it best to finish the part before hardening.
Leaving the surface finish after milling was not acceptable.
Maybe I should re-think that.
I still need to drill and tap the locking set screw for the adjusting bolt/screw.
I Haven’t decided what to do with the finish after hardening.
Bluing maybe?
Click to expand...
Bluing looks better when the surface is polished.
 
Most metals have residual stress, heat treat sort of relieves this internal stress but affects any previous machining. You'll see bulges, dips and slopes. Watch the WIYB machinist vice vid, very illuminating:
 
middle.road said:
Wish that I had a decent chuck with slots to utilize those.
Is that a 6-Jaw?
Click to expand...
This is a 4 jaw Bison.
I made sure it had the T slots before I laid out the money.

I’m using the SG as another tool to get the parts where I want them to be before hardening. Probably spending way too much time but I’m learning as I go. I’m going to have to grind again after hardening.
I screwed up by trying to clean up the finish with a belt grinder, I lost parallel, I had to grind so I could clamp in the vise for the remaining ops.
If I worked for me, I’d be in the unemployment line
 
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