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McCormick Knife grinder

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Wardner

06-13-2007 17:06:59

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I have had this for 20+ years. I don't think the grinding wheel is the right one as it doesn't fit. Can't figure out why I have the extra gears.

I need to know why the wheel arbor goes up and down as the wheel rotates. What does the grinder attach to? The mower bar, maybe. Was it used in the field or the shop?

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Jim Becker

06-14-2007 07:35:52

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Re: McCormick Knife grinder in reply to Wardner, 06-13-2007 17:06:59

Your grinding wheel looks too big for the tool. It also looks like you may be missing a few pieces. I don't see the parts that clamp the knife in place. Look at this page to see what the complete tool looks like, clamped to ta mower and with the knife clamped into it.

Knife Sharpener

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Cedric

06-14-2007 03:22:57

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Re: McCormick Knife grinder in reply to Wardner, 06-13-2007 17:06:59

I have one of those grinders. A parallel stone was also available for use as a general purpose grinder. The hinged arm that holds the arbour was set on the fixed peg when used as such. Sid.

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Mingo

06-13-2007 17:42:18

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Re: McCormick Knife grinder in reply to Wardner, 06-13-2007 17:06:59

The gears seem to be just extra--I would bet that they have the same number of teeth as the one on the grinder. The grinder clamped to the wheel of a horse mower, you clamped the sickle knife to it and then the grinder moved up and down to sharpen the sides of two sections. You then moved it one way or the other until you had sharpened all the knife sectons. I would be most interested in the name on the rock you have.
By the way the nuts that hold the rock on the shaft are left handed threads,

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Wardner

06-13-2007 18:37:13

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Re: McCormick Knife grinder in reply to Mingo, 06-13-2007 17:42:18

The extra gears are identical to one of the gears on the machine.

Can't see how the knife could clamp to the grinder. The only clamp I see mounts the machine to a stationary object. Yes, a steel wheel would be perfect.

The grinding wheel is branded by Bay State Abrasives, a division of Dresser. It is carborundum and has a max rpm of 4140. Part # is 893542. The diameter of the stone is too great to fit the throat surrounding the arbor. The bore is bigger as well.

I remember seeing similar stones at the hardware store and the IH dealer when I was a boy in the '50s.

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Janicholson

06-13-2007 17:23:33

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Re: McCormick Knife grinder in reply to Wardner, 06-13-2007 17:06:59

I'm old enough:
This grinder was used (both in the field at times, and at the machine shed) for sharpening siclkle sections while on the bars. The sickle bar was pulled out of the guards, and worked on as a whole. The machine was clamped to a convienient surface, or angle iron and held steady. The sickle bar was clamped in to allow the sections (and the whole bar) to pivot allowing the sections to be ground from root to tip (the ocillation motion) Two surfaces were ground at a time, one on each of two different sections. That is a very close to correct stone, it may need a sleeve arbor to make it centered, but it is not wrong. The person grinding the sections could sharpen a bar on a 7 foot mower in about 25-35 minutes. (compared to replacing sections that took 2 hours. (and cost way more than my grandfather would consider rational) The sections were often not serrated as they are today, and if at all dull, were sure to plug the mower, or make stripes in the field (again the grand dad did not approve) They were a necessity. The steel in modern sections is so good, and the sections cheaper (it is considered) so it is not used except to show it off. I hope this is enough content, JimN

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Wardner

06-13-2007 17:37:25

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Re: McCormick Knife grinder in reply to Janicholson, 06-13-2007 17:23:33

Was it a man plus boy/girl/wife job? In other words, did one person crank and the other sharpen? Can't see how one person could do both functions and wind up with a good job.

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El Toro

06-13-2007 17:18:35

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Re: McCormick Knife grinder in reply to Wardner, 06-13-2007 17:06:59

I think it mounted on the wheel, but I could be wrong. It may have been mounted on the sickle bar. We used a grinding wheel similar to the one in the picture. I heard some farmers are using a disc sander to sharpen their sickle bars. Hal

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Steven@AZ

06-13-2007 18:00:14

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Re: McCormick Knife grinder in reply to El Toro, 06-13-2007 17:18:35

4" Makita angle grinder works great, takes about 10 minutes to do a 7 foot bar, but you need to pull the sickle out to do it right... and of course have under-serrated sections.

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GordoSD

06-13-2007 19:06:06

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Re: McCormick Knife grinder in reply to Steven@AZ, 06-13-2007 18:00:14

Yep, use the angle grinder with the new 80 grit flap wheels, and you can shave with those sections.

Gordo

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