Seeking a small SG with 1" spindle

veniceboo said:
By the way the manual for the Sanford SG 48 states the spindle speed is 5500 rpm. I don't believe that the spindle is a direct drive from the motor.
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Well good luck finding one of those machines, the recent thread some else just posted is the only one I've ever seen before...
 
Are you asking for a 1" hole through your spindle, or a 1" spindle. I don't understand the need for a certain size spindle unless there is a hole involved or you already have the wheel you want to use.
 
veniceboo said:
By the way the manual for the Sanford SG 48 states the spindle speed is 5500 rpm. I don't believe that the spindle is a direct drive from the motor.
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Grinding speed is all about surface speed, how fast the grit is going past and rubbing the material being cut. A 3" wheel has to turn twice as fast as a 6" wheel to achieve the same "surface feet per minute (sfpm)". For grinding steel, we use somewhere around 5500 sfpm. A 7" wheel achieves 5500 sfpm at about 3450 rpm, and a 1 " wheel achieves 5500 sfpm at about 24000 rpm. I have no idea what sfpm wood prefers, probably pretty high.
 
Bob Korves said:
Are you asking for a 1" hole through your spindle, or a 1" spindle. I don't understand the need for a certain size spindle unless there is a hole involved or you already have the wheel you want to use.
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Sorry, this is not really my area of expertise so I'm not totally sure about the nomenclature. The cutters that I'll be using have a 1" hole. They are double sided 30 degree milling cutters and they're 2 and 3/4" in diameter. Cutters like this are readily available from McMaster Carr and any number of other places. Because they are so common they are cheaper and this size is optimal for a machine like this. Bigger cutters mean my hold downs won't be as close to the business end which opens me up for tear out. There are a set of the cutters in the picture next to my machine. This is what it looked like before I converted it.

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veniceboo said:
Maybe, but they are the ones I use for my mill and they work great. Many builders use the same cutters.
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This is confusing, the thread title says SG & a Sanford SG-48 is a surface grinder. SGs use grinding wheels, not cutters. Sounds like you are looking for a horizontal mill rather than a surface grinder?
 
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