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Question about Bench Grinders

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Forum topic by Steven H posted 05-29-2010 07:05 AM 997 views 0 times favorited 5 replies Add to Favorites Watch
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Steven H

1117 posts in 2523 days


05-29-2010 07:05 AM

This is my first time buying a bench grinder. Need one for flattening my chisel. I have 3 question.

1) Is it better to have 2 different speed bench grinder, one low speed and one high speed? Or variable speed?

2) For the grit, what would you guys use for flattening the bevel? Im not using it for sharpening.

3) What is the difference between High Speed and Low Speed Sharpening?

Thanks


5 replies so far

View a1Jim's profile

a1Jim

115202 posts in 3040 days


#1 posted 05-29-2010 07:09 AM

I’ve never bought any special grinders I bought one from sears 25 years ago and I’m still using it. usually they come with two different wheels a course and a fine.

-- http://artisticwoodstudio.com Custom furniture

View Eagle1's profile

Eagle1

2066 posts in 2527 days


#2 posted 05-29-2010 12:37 PM

There alot of grinders out there. I have 2 one is variable speed the other one is not. One 6” the other 8”. If you have any thought about turning wood at any time, I would look into getting a 8”.

-- Tim, Missouri ....Inside every older person is a younger person wondering what the heck happened

View Marc5's profile

Marc5

304 posts in 2805 days


#3 posted 05-29-2010 02:27 PM

It sounds like this may be your first and If you have the means I would suggest a Jet 10” slow wet grinder. It comes with a plane iron and chisel jig that is a snap to set up and guarantee’s repeatable results. You can use the side of the wheel to flatten your chisels to a 1000 grind and hollow grinds are a snap. This is nice when you have a old chisel that needs some work reducing time on the wet stones. Being a wet grinder it will not blue your chisels or plane irons. Tormek jigs can be used on the Jet and there is a jig available for almost every sharping operation you can imagine. Since I purchased this tool my bench grinder is in the garage and most likely will end up in an auction.

For me, it is all about spending lees time sharpening and more time making shavings.

-- Marc

View David Craig's profile

David Craig

2136 posts in 2571 days


#4 posted 05-29-2010 04:52 PM

I bought a Delta 6 inch variable speed grinder awhile back. If I could do it all over again, I would have picked up the 8 inch, but I can make the grinder work to fulfill my needs. I would not suggest using it to flatten the chisel backs, at least not without a jig. I can be a little tricky getting a long flat surface with a round wheel. I screwed up a few chisels after I bought the grinder by attempting to do sharpening and flattening. For flat backs, you might want to invest in a piece of glass and some adhesive sandpaper, both high and low grits, or pick up a sharpening system, instead of the grinder. What I have used the grinder for (successfully anyway) is to grind away some pitted edges of old chisels and resetting the initial bevel. Then I took it to my sharpening system (worksharp 3000) and sharpened and honed the chisel. I have variable speed but have pretty much stayed with the lowest speed so as not to burn the chisels and to perform the grinds with a little more control. There are jigs available for the grinder and sharpening systems (Tormek, Work Sharp) that allow you to flatten and sharpen without a grinder.

High speed grinding is used to remove material quickly, which you don’t really want when you are fine tuning the backs and bevels of a chisel. Keep a glass of water on hand to keep the chisel cool. Very easy to burn out the temper. Your grinder will come with a fine and coarse stone. I mostly use the fine stone.

Hope this helps,

David

-- There is little that is simple when it comes to making a simple box.

View SnowyRiver's profile

SnowyRiver

51452 posts in 2943 days


#5 posted 05-29-2010 05:00 PM

I have a single speed Delta 8” grinder and it has a coarse wheel and a fine wheel. Thats all I have ever used.

-- Wayne - Plymouth MN

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