Sharpening with a bench grinder

  • Advertise with us

« back to Hand Tools forum

Forum topic by curliejones posted 07-17-2018 12:02 PM 720 views 0 times favorited 9 replies Add to Favorites Watch
View curliejones's profile


186 posts in 2719 days

07-17-2018 12:02 PM

Topic tags/keywords: bench grinder chisels hand tools sharpening

A two/three part ??
I’ve read about one technique for sharpening shop tools where the guy recommended starting and stopping his bench grinder to sharpen chisels, etc. It lets him use his single speed grinder and catch the steel at diminishing speeds. I don’t do a lot of sharpening and I wonder if this start and stop technique is hard on a good motor or just puts wear on the on-off switch?
If indeed it is not that bad for the motor, could / should a momentary foot switch be used and leave the grinder switch in the “on” position? As long as the amp rating is high enough for the switch, would a Big Foot switch for trolling motors work OK? A 15A rating on a switch and a grinder that is rated at 5A , for example?

-- Like Guy Clark sez - "Sometimes I use my head, Sometimes I get a bigger hammer"

9 replies so far

View Bill White's profile

Bill White

5216 posts in 4413 days

#1 posted 07-17-2018 12:28 PM

NNNOOO!!! on the trolling motor!!!! Different animal for a different purpose. If you must pursue the start/stop process (which I don’t value), get a momentary foot switch designed for the proper AC induction motor.
I use one on my router table, but that’s a totally different story.

-- [email protected]

View TheFridge's profile


10859 posts in 1939 days

#2 posted 07-17-2018 11:23 PM

Not good for the motor. Once or twice is one thing. More than that is another.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Mr_Pink's profile


167 posts in 825 days

#3 posted 07-17-2018 11:55 PM

I don’t know about the effects on the motor, but this would certainly overcomplicate the process of grinding.

View theart's profile


112 posts in 1007 days

#4 posted 07-18-2018 12:57 PM

It lets him use his single speed grinder and catch the steel at diminishing speeds.

I can’t see any reason why this would be useful. Steel doesn’t care how fast the stone is moving. Full speed, light touch, and let the blade cool between passes.

View Don W's profile

Don W

19294 posts in 3021 days

#5 posted 07-18-2018 03:57 PM

The faster it moves the quicker it build heat. That way we say a slow speed grinder is best, but with care, a normal grinder works well. Go slow, quench often, and you’ll be ok.

I often take several passes then set it in the water and focus on something else for a few minutes if it’s a long term grinding op.

-- - Collecting is an investment in the past, and the future.

View RHutch's profile


7 posts in 3507 days

#6 posted 07-19-2018 04:19 PM

I’m in agreement with the full speed and regular cooling in water. I’ll add that I don’t use my grinder for sharpening ever. It’s just there to reshape misused tools found at yard sales.

-- Hutch, Rhode Island

View MrRon's profile


5631 posts in 3696 days

#7 posted 07-19-2018 05:39 PM

If you use an aluminum oxide wheel (white), it won’t heat up the steel as much as a carborundum wheel will. A grinder is used to shape tools, not to sharpen them. After reshaping the tool, then you sharpen it using stones or diamond. Sanding belts are out for sharpening. They round over the edge.

View Karda's profile


1615 posts in 1007 days

#8 posted 07-19-2018 05:50 PM

I have never used this method but done see a use for it other than very small to that would burn easily. I read one turner used that method for his under .25 inch skews because even regular slow speed would burn them, makes sense

View bandit571's profile


23429 posts in 3136 days

#9 posted 07-19-2018 06:29 PM

Maybe find one of these?

And use it….WEN Wet Wheel.

-- A Planer? I'M the planer, this is what I use

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics