Surface Grinder?

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Harold_V
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Re: Surface Grinder?

Post by Harold_V » Sat May 15, 2021 3:03 pm

rmac wrote:
Sat May 15, 2021 5:18 am
Mr Ron wrote:
Sat May 15, 2021 4:01 am
A surface grinder can't handle anything that large.
Not so. As Bill said, you just need a big surface grinder.
Correct! Just because the bulk of surface grinders fall in the small category (6" x 12" or 6" x 18") doesn't mean they're not made larger. In fact, one of our readers, gcarsen, happens to own a 10' surface grinder. I'm not sure of the cross slide capability (Y axis), but it's likely to be 36".
The second video I referenced above shows a big SG finishing a table saw top. The first video shows a Blanchard grinder flattening the same top before they used the surface grinder to remove the circular marks left behind by the Blanchard.

I'm kind of assuming that this was a two-step process because it would have taken forever to do the initial flattening on the surface grinder. Can somebody confirm that guess?
Because Blanchard grinders are typically powered with huge motors, they are capable of performing much like a milling machine. They can move a frightening amount of metal, and are equipped with large wheels, with segmented inserts. The resulting surface may be somewhat coarse, although, given adequate spark-out time, assuming the machine has been properly set up, the resulting surface can be as flat as one generated by a linear surface grinder, and with a very nice finish, so a followup linear surface grind isn't necessary unless a straight line finish is desired.

H
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liveaboard
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Re: Surface Grinder?

Post by liveaboard » Sun May 16, 2021 6:43 am

The surface of a wood cutting machine just doesn't need that level of accuracy.

I plan to plane my warped cast iron tablesaw / shaper top on my milling machine, even though I'll likely need to move the work along the milling machine table to get it done.
When I get the milling machine to work that is...

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Bill Shields
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Re: Surface Grinder?

Post by Bill Shields » Sun May 16, 2021 12:51 pm

Giggle. .what does NEED have to do with it?
Too many things going on to bother listing them.

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4gsr
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Re: Surface Grinder?

Post by 4gsr » Sun May 16, 2021 1:31 pm

If you do get the top reground or planed, the table top is very thin, person has to be very careful how you support the top. It will require shimming underneath the table top to keep it from dipping down when going across it with a tool that is removing metal. Rather you grind it or plane it, the problem will exists. Just a little "heads up". Ken
Ken

VelocityDuck
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Re: Surface Grinder?

Post by VelocityDuck » Sun May 16, 2021 2:07 pm

GlennW wrote:
Sat May 15, 2021 7:57 am
Southern Grinding Services in Pompano Beach, FL does both.
From Panama City that would be about an 8 hour drive. Atlanta is almost half that.

VelocityDuck
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Re: Surface Grinder?

Post by VelocityDuck » Sun May 16, 2021 2:08 pm

whateg0 wrote:
Sat May 15, 2021 2:28 pm
Grinding? If you want it really flat, I want to see it scraped!!

Are you grinding for appearance or for use? I've used epoxy to fill divots in drill press tables and vises and it works fine. Are you talking about a depression or pitting from rust?
Appearance. Mostly pitting from rust.

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rmac
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Re: Surface Grinder?

Post by rmac » Sun May 16, 2021 4:04 pm

You might call these guys just to see what they have to say:

https://csmachineco.com/capabilities

They're closer to you than Atlanta, and they have super Google reviews.

-- Russell Mac

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4gsr
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Re: Surface Grinder?

Post by 4gsr » Sun May 16, 2021 5:49 pm

Someone with a CNC mill locally can mill your table top flat leaving a very nice finish on it. It won't be ground, but they can make it look pretty with the right facemill.
Ken

pete
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Re: Surface Grinder?

Post by pete » Sun May 16, 2021 7:05 pm

Unless you already had free access to a large mill, surface or Blanchard grinder I very much suspect the costs are going to far outweigh the aesthetic benefits of having it done. Plus there's every chance of making it less flat than it already is if there's any stresses left in it. It's already been mentioned the tables on these aren't very thick. So it wouldn't take much to warp the top. Finding another table without the rust pits would probably be the cheaper option.

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