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Forum topic by Charlie75 posted 03-07-2015 10:14 PM 877 views 0 times favorited 10 replies Add to Favorites Watch
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Charlie75

286 posts in 1727 days


03-07-2015 10:14 PM

I am thinking about getting a bench grinder and learn to sharpen my own tools.

Been watching Craigs list but not much comes up. There are a lot of grinders but they are mostly 6” high speed.

This raised the question in my mind, would a 6” high speed grinder work.

High speed vs low speed. 6” vs 8” and 1/2 hp vs 3/4 hp. all raised questions in my mind.

Charlie

-- Charlie75, Alto


10 replies so far

View TheDane's profile

TheDane

4997 posts in 3125 days


#1 posted 03-08-2015 01:15 AM

Charlie … You can get by with a 6” high-speed grinder. A lot of turners have been using them for years with great success.

You just have to make sure you put friable wheels on it (the grey wheels most come with are not appropriate for sharpening HSS tools) and above all, take it easy to avoid grinding away too much steel.

That being said, by the time you buy a high speed 6” and replace the wheels, you will probably spend close to what you would pay for the Rikon slow speed with friable wheels at Woodcraft ( http://www.woodcraft.com/Product/158512/Rikon-8in-Slow-Speed-Grinder.aspx ).

I have a 1/2 hp slow speed that I bought from Woodcraft four years ago … it has been fine.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View ElChe's profile

ElChe

630 posts in 799 days


#2 posted 03-08-2015 04:53 AM

I’ve been using a cheapo free 3450 8” grinder with a Norton white wheel with no problems on plane irons and chisels. I keep a little container of water and dip when steel gets uncomfortable on my finger tip. Light touch. Works great. I think a 6” wheel would effectively run slower if my mind math is correct. But my mind like my wheel is friable. I did get a decent tool rest because the cheapo grinder came with a usless tool rest.

-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.

View LeeMills's profile

LeeMills

271 posts in 764 days


#3 posted 03-08-2015 04:53 AM

I agree with the above.
I have use a 6” grinder with no problems (abt 35 years). If new I would go with the low speed and 8”.
A light touch is all you need with either.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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Charlie75

286 posts in 1727 days


#4 posted 03-08-2015 12:08 PM

My original question may have been a bit misleading. I was referring mainly to turning tools. Of course I want to grind chisels and plain irons too.

There are many 6” high speed grinders available in my area at prices that fit my budget at this time but I don’t want to get something that won’t work at any price.

Where do you guys get your grinding wheels?

Charlie

-- Charlie75, Alto

View jdh122's profile

jdh122

879 posts in 2280 days


#5 posted 03-08-2015 12:23 PM

Turning tools are even easier to grind on a regular grinder than chisels and plane blades, because high speed steel is less likely to burn than carbon steel. Any 6-inch regular grinder will work, you just need to make sure you gave an aluminum oxide wheel (white, friable). You need to make sure to dress the wheel often, cause if it glazes over it’ll burn your tool in no time flat.
I bought mine at Lee Valley, but all of he regular woodworking sources sell the wheels (Woodcraft, HIghland, Rockler, Amazon and no doubt many others).
TheDane brings up a good point. Include this extra wheel purchase in your calculation in comparison to the RIkon or similar grinder that comes pre-outfitted with these wheels. Personally I don’t think it’s necessary to have two white wheels, though. I left on the regular, included wheel to use occasionally for non-tool grinding.

-- Jeremy, in the Acadian forests

View LeeMills's profile

LeeMills

271 posts in 764 days


#6 posted 03-08-2015 02:53 PM

A little OT but I never grind my chisels (bench or lathe). I like them razor sharp so just a few passes to hone brings them back. To grind you would be starting all over. For the lathe I hone the skew, parting tool, and the small cutters which are hard to grind.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View ElChe's profile

ElChe

630 posts in 799 days


#7 posted 03-08-2015 03:27 PM

Lee Valley or Sharpening Supplies carries the Norton white friable wheels.

-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.

View waho6o9's profile (online now)

waho6o9

7172 posts in 2039 days


#8 posted 03-08-2015 04:15 PM

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.X8%22+slow+grinder.TRS0&_nkw=8%22+slow+grinder&ghostText=&_sacat=0

HTH

I purchased a similar one a few years back with the friable wheels and
she’s still working fine.

View TimberMagic's profile

TimberMagic

114 posts in 642 days


#9 posted 03-09-2015 07:32 AM

I have a Delta 6” grinder, and did put one Norton wheel on it for grinding lathe chisels. I have to raise it up now since I just bought a Wolverine jig, and my setup lacks the necessary clearance/height. I’ll get an 8” slow speed grinder next year, and I am really anxious to get CBN wheels. Check out D-Way Tools for info and videos if you are not familiar. They are expensive, but are really impressive. CBN grinding wheels are coated metal wheels. They need no wheel guard since they will not fracture and fly apart.

I just saw a turning demo this week at Woodcraft. The turner had two 8” grinders set up with 4 CBN wheels (platforms set at different angles for grinding different tools). Really a nice setup. That is over $700 just in wheels!

-- Lee

View whitetimothyaus's profile

whitetimothyaus

1 post in 637 days


#10 posted 03-09-2015 11:03 AM

I have 6” grinder and it is working really very well.

-- http://www.energysavingsblinds.com.au

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