Thread: Low budget grinder V2 clone....thanks Charlie

Um, well, I guess my next question is what sfpm speeds do I want?

I'm seriously impressed. I can think of a bunch of knifemakers who have done homebuilt grinders. They model their designs on a settled industrial type and assemble them from metal scrap from the boneyard with the intention of using ready made grinding wheels from a standard wheel manufacturer.

Here you go making everything from the ground up out of stuff the other guys would never think of using. The only thing that would make this better would be a steam powered motor with a piston powered flywheel to keep up the turning momentum. Straight razors are retro enough, why not the tools too?

Variable speed is the ideal. With a single speed grinder you can do just fine (sfpm), but there will rapidly come a time when even that will be too fast for some delicate material that doesn't mix well with heat.

Here is a quick addition ....

Here is a link to a hole saw for easily cutting out various sized wheels....

DeWalt D180064 4 inch 102 mm Bi Metal Hole Saw

It mounts in a drill press or drill.

You can use 1/2" MDF and simply glue 4 of them together with epoxy for a 2" wide wheel. The hole saws come in various sizes. About the biggest I have seen is a 5". I have made a number of wheels with these.

Originally Posted by medicevans

Um, well, I guess my next question is what sfpm speeds do I want?

I'm hoping some of the guys who have been making their own blades for a while will chime in with this question. But here is what I have; 2650, 1325, 1050, 830, 675 sfpm. Most these speeds correspond to the diameters of my hole saw set, all but the 2650 sfpm, which a mate turned up for me.
Have seen the different speeds running, I thinks that you need at least a 2500+ sfpm speed for your rough grind. I haven't done any post heat treat grinding yet but the 850 and 675 sfpm speeds look like they would be suitable, still unsure on the 850 though.

Hope this helps. Take this info with a grain of salt as I have only just started at this grinding stuff

Stu

I like around 400 feet/min when going slow and around 3000 feet/min when going fast. I do not have a variable speed but I have a lot of pulleys. I do 99% of my grinding at about those two speeds.

Charlie

Originally Posted by Mike Blue

I'm seriously impressed. I can think of a bunch of knifemakers who have done homebuilt grinders. They model their designs on a settled industrial type and assemble them from metal scrap from the boneyard with the intention of using ready made grinding wheels from a standard wheel manufacturer.

Here you go making everything from the ground up out of stuff the other guys would never think of using.

Again, I can't take credit for the idea on this one, this was Charlie's idea and I modified to suit what I had.

http://straightrazorpalace.com/forge...er-v2-0-a.html

Here is the product of the grinder so far. I needed to use files to get into some of the tight spots but the bulk of this was done with a 40 grit belt. I will change out the belts and smooth the edge some more before grinding the blade. I have a bit of work to do to finish my tool rest, then on to the tricky bit.

Stu

I've almost finished the blade guide. Here are a couple of pics.


Please excuse my messy workshop. I need a big cleanup on the weekend.

Shops are supposed to be perfectly tidy once a year...that's it.

Messy? Ya gotta be kidding me! Compared to mine yours looks neat as a pin!

Nice job.