Author Topic: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?  (Read 6982 times)

Offline Bolster

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Is that possible? Or is it crazy? Putting a cup-style grinding wheel in a vertical mill's quill and using it as a surface grinder? Obviously you'd have to shield/protect the ways....Anybody tried this?
a.k.a. Delmar O'Donnell, bona fide soggy bottom boy

Offline Bogstandard

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #1 on: November 19, 2010, 03:07:21 PM »
If your mill can get up to over 5000rpm, then yes.

Bogs
If you don't try it, you will never know if you can do it.

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Offline Trion

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #2 on: November 19, 2010, 04:15:36 PM »
I know nothing about surface grinders, but logic makes me think  the spindle speed needed depends on the wheel size!? :scratch:

Offline Bolster

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #3 on: November 19, 2010, 07:20:12 PM »
If your mill can get up to over 5000rpm, then yes.

Bogs

Then I am screwed. 2000 is my top speed. Darn it.
a.k.a. Delmar O'Donnell, bona fide soggy bottom boy

Offline Andrew_D

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #4 on: November 19, 2010, 08:01:24 PM »
If your mill can get up to over 5000rpm, then yes.

Bogs

Then I am screwed. 2000 is my top speed. Darn it.

As mentioned, wheel size plays a role....just get a larger wheel to keep the feet per minute of the cutting edge up high enough.

Andrew

Offline Bogstandard

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #5 on: November 20, 2010, 12:14:47 AM »
I use up to 8" wheels on my surface grinder, and they are rated up towards 6K RPM.

I have used a large diamond lap at fairly low speeds under experimental circumstances, but that would require flood coolant and is limited to the materials you can use it on.

http://madmodder.net/index.php?topic=2232.0

I am also playing about with diamond coated laps, but that is a little in the future.

http://richontools.com/index.php?main_page=index&cPath=1_9

and their associated backing plates

http://richontools.com/index.php?main_page=product_info&cPath=45&products_id=797


Bogs
If you don't try it, you will never know if you can do it.

Location - Crewe, Cheshire

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Offline Lew_Merrick_PE

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Re: Does Cup Grind Wheel in Mill Spindle = Poor Man's Surface Grinder?
« Reply #6 on: November 20, 2010, 11:14:19 AM »
The basics of a surface grinder are not all that complicated.  The "issue" is defining a set of specifications that would make for a good overall project.  The size of the unit is fairly easily varied, but I would need good definition as to the resolution of (downfeed, mostly) such a unit.  Laying out such a design is fairly trivial once the specifications are set.

How about: 6 inches (150 mm) vertical feed with .0005 inch (0.01 mm) nominal vertical feed resolution; 18 inches (450 mm) longitudinal table travel X 8 inches (200 mm) crossfeed table travel; with a ø1.250 inch (ø31.75 mm) wheel spindle as a baseline?  Personally, I prefer a pneumatic longitudinal drive, but a cable-type drive is doable.  What criteria would be appealing here?

Irrational minds want to know...  ;-)