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Grinder Speed to Sharpen

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Forum topic by davidroberts posted 11-29-2009 05:50 AM 1130 views 0 times favorited 6 replies Add to Favorites Watch
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davidroberts

1025 posts in 2945 days


11-29-2009 05:50 AM

Topic tags/keywords: sharpen grinder

I want to try and grind a bevel in a test chisel. Until now, I’ve used water stone. I have an old Cman 3450rpm grinder and bought a white wheel, but now I’m starting to believe 3450 rpm may be to fast, especially given the popularity of the tormak low speed grinder. So what speed grinder do you use to put a bevel on a chisel. Thanks!

ps, I bought the veritas angle jig for use with a grinder, so I do have a guide.

-- Better woodworking through old hand tools.


6 replies so far

View MedicKen's profile

MedicKen

1610 posts in 2921 days


#1 posted 11-29-2009 06:16 AM

I am using a 1/3hp motor that is 1725 rpm. Be careful and use a very light touch when grinding and dont burn the edge. If you get any bluing of the steel it will have to be ground off. Have some water nearby to cool the blade between passes.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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jack1

2057 posts in 3487 days


#2 posted 11-29-2009 06:25 AM

or oil. that works too. I need a slower grinder too.

-- jack -- ...measure once, curse twice!

View mski's profile

mski

418 posts in 3440 days


#3 posted 11-29-2009 06:41 AM

I have a 20 year old Harbor frt 3250 rpm , I got a white wheel and had a he%# of a time until I bought a diamond cutter to true the wheel, works excellent for my lathe tools but planes and bench chisels takes some practice not to burn and you will never get them to useable sharpness without hand honing anyway even with a 1750 rpm, so if you jump, jump all the way to a slow speed wet wheel.
There are some cheaper versions of the tormak from HF ,Grizz and another german (Starts with S I think) one on Amazon that I would get to save ALOT of $ ,but I do not have the need, past lathe tools.
Me 2c

-- MARK IN BOB, So. CAL

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TopamaxSurvivor

17654 posts in 3135 days


#4 posted 11-29-2009 08:12 AM

My grinder is an old Craftsman, 25-30 yrs old. I think hi-speed. I just keep water handy to cool. I sharpen everything from lawn mower blades to chisels, dril bits and and plane irons on it. I do the final touch up by hand on the precision stuff. Most of the time I keep coarse and fine wheels on it. The lawn mower blade never touches the fine wheel :-)) You can use any seed grinder and long as you know what you are doing and don’t burn the edge. Somebody on here said the modern tools steels can be burned without taking the temper out. Just be careful and keep things cool and you won’t have to worry about it.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Derek Cohen's profile

Derek Cohen

296 posts in 3428 days


#5 posted 11-29-2009 05:19 PM

Do NOT use the grey wheels that comes with most grinders. Get either a white or blue Nortons at either 36 or 46 grit. You want a coarse wheel for cool grinding. The smoother wheels are for HSS lathe chisels (which do not burn). A very light touch is still needed. Keep a finger on the blade near the edge to check for heat.

Regards from Perth

Derek

-- Buildiing furniture, and reviewing and building tools at http://www.inthewoodshop.com

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bigike

4048 posts in 2748 days


#6 posted 11-29-2009 05:46 PM

i have a delta and it has a speed knob to slow the wheel down i put it all the way to the slowest speed posible and grind on that speed u can get one for about $60-$100 on ebay the only thing is it comes with a grey wheel an a white one dont know the grits but the white one i want to change to get a better one like from norton but need to know the best grit to get? but for now it works for me.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

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