Grinding small holes

Any reasion not to use a larger diameter like 1/2”
 
On the video he said single cut. Like a single cut file
 
1/4" because of collet size but I'm not sure about that... just what I use. I've only bought one burr ever for it and it still seems new despite lots of use.
 
Thy make larger burrs that have 1/4” shanks. There is a 1/2” and a 3/4” and larger. But I think maybe going to big could create a spinning blade of mega death.
 
I gotta make one of these I have a router i don't use.

JTknives said:
Thy make larger burrs that have 1/4” shanks. There is a 1/2” and a 3/4” and larger. But I think maybe going to big could create a spinning blade of mega death.
Click to expand...

The closer you get to the hole size the more teeth you'll have engaged in the cut. You can get chatter with too light of cut or like you said a spinny knife.
 
JTknives said:
Thy make larger burrs that have 1/4” shanks. There is a 1/2” and a 3/4” and larger. But I think maybe going to big could create a spinning blade of mega death.
Click to expand...

lol I agree! On second thought my chamfer bit is 1/2" but I never use it, just use the ball end cylinder (lol I bet that name is not correct) and lower it to chamfer.
 
I got the wife looking for HF coupons as we speak lol
 
kuraki said:
I gotta make one of these I have a router i don't use.



The closer you get to the hole size the more teeth you'll have engaged in the cut. You can get chatter with too light of cut or like you said a spinny knife.
Click to expand...

Sounds like another project for the laser cutter. Would be cool if the top was adjustable so you could change the angle to the burr
 
JTknives said:
Thy make larger burrs that have 1/4” shanks. There is a 1/2” and a 3/4” and larger. But I think maybe going to big could create a spinning blade of mega death.
Click to expand...

Make a jig to clamp the blade in and use a plunge router with a bit the exact size of the finished hole.
 
If I were doing larger batches of those 120 ata time I'd get a cheep dedicated drill press and a small cylinder hone like used for honoring brake cylinders. Build a fixture to hold 10-20 blades in. Veuala. Do one hole till it's polished then move to the next. 10-20 blades done in minutes. You can get pretty high grits on them.
 
That's a neat idea. I think a carbide tipped reamer would be the best balance between cost, repeatability and ease of use.
 
KnuckleDownKnives said:
If I were doing larger batches of those 120 ata time I'd get a cheep dedicated drill press and a small cylinder hone like used for honoring brake cylinders. Build a fixture to hold 10-20 blades in. Veuala. Do one hole till it's polished then move to the next. 10-20 blades done in minutes. You can get pretty high grits on them.
Click to expand...
I cant find the rest of them now..............I think that this will work....they come with three , four stone .............

Kw812ds.jpg
 
why not have the holes cut out undersized when they get cut out for you? then its just cleanup with a large reamer,carbide burr,stone if fine enough. i have 1 inch carbide burrs that use a 1/4 shank.
 
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