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Old 10-13-2004, 09:04 PM
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riches139 riches139 is offline
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Building a blade grinder

I have my design layed out for a blade grinder I wish to build.

My question is should I use a motor with 1725rpm or 3450rpm?
I see both advertised on other grinders.

I don't want to burn the metal.
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Old 10-13-2004, 11:01 PM
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What will the grind stone be rated at? You do not want a stone to come apart in your face it could ruin your whole day. And what size will the stone be? The bigger the stone the faster the surface speed will be at a given RPM.
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Old 10-14-2004, 06:57 PM
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I realize that a smaller wheel will have a lower surface speed,
but I may need a 8" wheel for clearance.
I haven't checked on the rating yet, but I'm sure they make wheels compatable for both rpm ranges.

I guess my question is, will the 1725rpm motor be sufficient for the task using the same size wheel and rating?

Never owned a grinder before, so I don't want to invest in a new motor that won't do the job.

Thanks Fixer
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Old 10-14-2004, 10:40 PM
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I checked our grinder at work today and it is rated at 3450 RPMs and has a 7" wheel and I have not had a problem with burning blades. You can sharpen mower blades free hand on just about any bench mounted grinder. In fact that is what we use at work. With all the funny shaped blades out now days the fancy high dollar blade machine is up on a shelf in back of the shop collecting dust. It was just too much of a PITA to try and set it up for every blade sharpen because no two were alike. And you had to have a mounting jig for every blade shape. It was more like cutting keys than sharping blades. A blade sharpening machine would be OK if all or most of the blades were the same type and shape I guess but I fine a bench grinder works just fine. I have even used a side grinder when some one else was using the bench grinder. By the way our bench grinder is not mounted on a bench. It is mounted on a pedestal (post) which makes it easier to use without the other end of what you are grinding hitting any thing. When you get your grinder built you should post some pictures of it. Have fun and good luck.
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Old 10-14-2004, 11:22 PM
UNISCAPER UNISCAPER is offline
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If you are going to the trouble of making a blade grinder, go a step firther. Look in the equipment, machinery trader for an old Bridgeport milling machine. Set the table for the angle you want, shave the dings off the blade. Takes about 10 seconds a side, you make even cuts, so balancing is nearly unnecessary, and you can put the shavings into a can, run them to the recycler and get Christams party money. We had $350.00 in ours when we were mowing alot and sold it for $500.00 when we moved. It was the best investment we ever made.
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Old 10-15-2004, 06:05 PM
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riches139 riches139 is offline
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I guess mine will work somewhat similar.

I will use a machinist cross slide vice to move blade back and forth, side to side.
Motor and wheel will be mounted 30 degrees to the horizontal plane.
Initial height adjustment will be with new wheel, as wheel wears thin shims can be added under blade to increase height.I can also use an adjustable motor mount to change height, but will increase cost.

Blades for my M60 Tank and walk behind are virtually straight, so I intend to end up with a "factory" quality grind.
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"04" F150 5.4 8' bed
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