Clamping fixture order of operations

[richz]

Hopefully my drawing makes sense. I am not quite sure on the correct way to make this. At first I thought about doing the reaming and threading first. Then sawing the 3” block to one 2” and one 1” the machining the saw cut area. I think after matching there might be some alignment issues. Then I thought about machining the 2” and 1” pieces, then clamping them together some how the do the machining. Next thought was to do the machining on each part individually using the dro to reference where the holes would be. I am leaning toward the second two. how would you guys go about this? This is going to be a clamping fixture.

 

[GeneT45]

I would probably ream and tap first, BUT what your fixture is missing is some stationary element (the mill table, or a base, etc). That element is, imo, critical to holding everything square and true as you tighten up on it. Hope that makes sense...

GsT

 

[richz]

The 2” x2 1/2” will be stationary. There will be two tapered head screws in each plate to hold a lawn mower blade. If you google all american blade sharpener you will see what I am trying to do.

 

[richz]

The 2 x 2 1/2 will be stationary. If you google all american blade sharpener this is what I am trying to make.

 

[GeneT45]

The 2 x 2 1/2 will be stationary. If you google all american blade sharpener this is what I am trying to make.

Found it. Cool deal. I'd go ahead and try it. If it binds then I'd add a bar along the bottom, screwed to the fixed jaw, with a slot for a screw and delrin or nylon washer on the running jaw. Hope that makes sense. I guess it doesn't matter unless your current design has issues.

GsT

 

[matthewsx]

The 2 x 2 1/2 will be stationary. If you google all american blade sharpener this is what I am trying to make.

That looks awfully fancy for sharpening mower blades. I just did them freehand in my shop but I can see how it would be nice to get them all precise like that.

BTW, is that a Samson lathe in your avatar like mine?

John

 

[richz]

Logan lathe

 

[stupoty]

Always do test reams on some spare material to avoid disappointment.

Not that it's ever happened to me at all

Stu

 

[RaisedByWolves]

I would start with a squared up block and drill and ream, then cut and square up the cut faces.

Always do test reams on some spare material to avoid disappointment.

Not that it's ever happened to me at all

Stu

I’m hoping he’s using over and under testers to begin with.

That will leave more wiggle room.