Should I get a surface grinder?

projectnut said:
Dusting the chuck may solve your problem. However, before I dd it I would be sure the chuck is properly secured to the table. It doesn't need to be torqued down hard, rather just enough tension to hold the chuck in place. If you tighten it down too tight it's likely it will warp over time. In most places it wouldn't be distinguishable, but when you're looking for flatness in the 1/10ths it will make a difference.

When I first got my machine, I noticed the chuck wasn't totally flat. I removed it, cleaned and stoned the table and the underside of the chuck and remounted it. I put a known thickness coupon in each corner and one in the middle and did some grinding. I only took off a couple tenths per pass and only moved over a quarter of an inch or so with each pass. When I was finished it was less than .0001 side to side and end to end.

It's one of those mind-numbing jobs to continue to pass over the coupons until they've totally sparked out. I wouldn't want to do it on a regualr basis, but it was worth the time I spent.
Click to expand...
Wachuko,

Sorry for infringing on your thread man. But, everything we are talking about is what you will go through to get the basics down.
I was reminded somewhere along this discussion about stoning the chuck.
Another advantage of having a surface grinder is you can make your own precision ground stones.
Bob Korves helped me with my first set and I have since made some for friends and more for myself.
Anyway,

Projectnut, I checked the spindle hub, tightened a hair, stoned the chuck, redressed the wheel then reground both sides of my D2 puck.
I have better results!
First of all, the finish is better.
Then I measured for parallel Perfect.
I think the precision stones made the difference.
Same 1 2 3 4 pattern with the same measurement!
That's incredible to me.
 

Attachments

  • puck.jpg
    puck.jpg
    88.1 KB · Views: 2
wachuko said:
Here you go...

View attachment 510692
View attachment 510693
View attachment 510694View attachment 510695View attachment 510696
View attachment 510697
View attachment 510698

This is the one that I bought...

View attachment 510699


And there are lot of boxes and tools that I could not make out from the photos... will have to wait until I get there.
Click to expand...
Awesome score. I’m looking to buy a Bridgeport. If you’re not then see what he’s asking for it. May be worth me taking the trip
 
Pevehouse said:
Awesome score. I’m looking to buy a Bridgeport. If you’re not then see what he’s asking for it. May be worth me taking the trip
Click to expand...
He wanted 5,900.00 for everything in the garage… he needs to clear the garage to sell the property. Pretty sure you can get a good deal since I just knocked out 900.00 from it.

I can send you his number via PM.
 
Another key to getting good surface finish and minimizing inaccuracies is to allow the machine to warm up properly.

I mentioned in another thread that on days the grinder was to be used the first one in the shop would turn on the lights then the surface grinder. By the time the remainder of the opening chores were completed (10 to 15 minutes) the grinder had warmed up enough to get all the play out of the bearings
 
wachuko said:
He wanted 5,900.00 for everything in the garage… he needs to clear the garage to sell the property. Pretty sure you can get a good deal since I just knocked out 900.00 from it.

I can send you his number via PM.
Click to expand...
Yes sir, let me get his number. Been looking for quite a while for a good Bridgeport
 
wachuko said:
You sum of beaches... arghhh... did something stupid, again! Bought it without looking at it... 900.00

Father passed away and son is selling all his machines...

Boyar Schultz 612 Surface Grinder

View attachment 510688

And only God knows what else I will take with me when I get to that garage... good grief...
Click to expand...
I wondered who was going to fall victim to this thread. lol
 
Janderso said:
I was getting quite a bit of wheel hop affect so I changed wheels after the first rough grind I installed a fine grain wheel.
The actual wheel hop affect was measured using my home made surface gauge. I picked up 0001-2". That's more than I would have thought.
I checked the spindle with a tenths indicator and noticed a .001" movement up and down.
So I che3cked the bearing adjustment. Got a slight turn out of the locking hub.
Rech3ecked, now I am back to comfortable .0003-4"
I bet the wheel hop affect is better.
I replaced the bearings myself. I know right!
But, Richard King advised me along the way. It wasn't too bad.
Click to expand...
I approve of your shop cleanliness and organization!
 
You must log in or register to reply here.
Back
Top