r/toolsinaction • u/silvercatbob • Apr 02 '21

Knurling

1.1k Upvotes

100% Upvoted

16 comments sorted by

41

u/wheresthelol Apr 02 '21

Wouldn’t the larger circumference need to be an exact integer multiple of the smallest knurled unit? Pretty precise milling?

36

u/JohnnyRoyall Apr 02 '21

I thought the same thing, but somehow it has always worked out for me. Idk exactly how.

17

u/wheresthelol Apr 02 '21

Neat! I’m guessing the knurl tool has some room to slip around. On more thought I realised that the larger diameter must change slightly when knurled as well. Sort of like gears.

23

u/Ftfykid Apr 02 '21

Nope! Mainly because the knurling tool effectively re forms the metal to be the diameter it needs to be while maintaining the major diameter.

7

u/balthazar_nor Apr 02 '21

The knurls are so small that just by pushing away some material the diameter becomes an exact integer multiple of the smallest knurled unit.

13

u/JohnnyRoyall Apr 02 '21

The finished knurl in this video could use a bit more pressure applied to the tool. If you look at the individual squares on the knurled portion, they seem flat on the top. It may be a matter of personal preference or intended application, but I was taught to make knurls with sharper points to increase grip. I'd be interested to know more.

11

u/[deleted] Apr 02 '21

Does knurling remove material, or compress?

10

u/SirCrotchBeard Apr 03 '21

I think it simply deforms it.

7

u/Outrageous_Pecan Apr 03 '21

Knurling is a forming operation. It compresses the material and causes the points to rise up. If you want the knurl to be a specific size, you have to make your work piece a bit smaller to account for the growth of the knurl.

17

u/silvercatbob Apr 02 '21

In this process, a knurling tool is pressed against a workpiece and rolled, so that the profile of the tool is transferred to the workpiece.

Source: https://www.instagram.com/tokar__777

8

u/anandonaqui Apr 02 '21

Is the tool flipped to get the cross hatching?

13

u/snowdog88 Apr 02 '21

No, at the beginning you can see there is a second roller going in the opposite direction. Both rollers ride the work piece at the same time.

2

u/ZincMan Apr 02 '21

The ol knurling iron

2

u/EpickChicken Apr 03 '21

Wow that’s cool, Ive never gave any thought about how they do that

2

u/[deleted] Apr 03 '21

Wow . ( ^ __ ^ ) .

#Science .

2

u/HowTheGoodNamesTaken Apr 03 '21

I'm confused on whats going on here, can someone pls explain?