Reversible Right Angle Die Grinder

Closest thing I have found is this drill but it's only 1800 RPM's...

https://www.harborfreight.com/3-8-eighth-inch-rev ... 67474.html

Richard S. wrote: ↑

Tue. Jun. 26, 2018 7:49 am

Closest thing I have found is this drill but it's only 1800 RPM's...

https://www.harborfreight.com/3-8-eighth-inch-rev ... 67474.html

Use the right abrasive wheel and 1800 is likely plenty fast enough. Faster isn't always better in grinding/sharpening. Lots of the best sharpening equipment has gone to slower surface feet per minute for good reasons.

If you look at the abrasive company info, you only need enough grinding surface speed to have the abrasive particles generate just enough heat to fracture and present new sharp edges as they wear down. At 1800 RPM the diameter of the grinding wheel out where the sharpening contact is occurring might be plenty fast enough to do what you need without over doing it.

Small, pointed cutting teeth are easily over heated out at the tips, because the cross section to conduct heat away is reduced. That's the main reason for using less surface speed, because it is less likely to overheat and draw out the tempering of the cutting edge, making the cutting edge go dull sooner.

Paul