Drilling a set screw?

G

Gfrost

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Well guys,

I have almost completed my first project on the lathe, An outboard lathe spider!
I have done all the turning and have it threaded to screw onto the outboard end of the spindle.

Last night I started to make the set screws until I ran into an issue-drilling into the end of them to put brass ends on them. I essentially killed a small center drill and two drill bits. So this morning I heated those set screws to cherry red and let them cool on there own and will try to drill again tonight.

I have watched a couple of YT videos about drilling hardened steel and it seems that a couple of things work but not very well.

Any suggestions would be greatly appreciated
 
Maybe what you did will work, but I've never tried to anneal something so small. I wonder if it would still cool too fast.

If you find they're still too hard, maybe try drill and thread a piece of stock, insert set screw, and anneal the whole thing. Would cool much slower.
 
I used stainless steel set screws on mine. Easier to drill.
 
Yeah, I got what was readily available here in town. I wanted 1" and actually ended up with 1.25".
If I have a lot of trouble I may just order some with the brass ends already on.

The fun is in the Journey, right?!!


Gary
 
I was actually having a hard time finding one that I could order an inch long.
MSC had some that I was going to order, than I found these in town!
 
Don't know what size set screws you are using but a solid carbide drill bit should do the trick.

I just used flat point set screws on mine but then again I haven't used it on anything where the surface finish was important like a gun barrel or something.
 
Brass set screws are available too, but maybe not locally.. We use them for orifices in projects at work, drill em to size. Found out long ago that the shop guys didn't like trying to drill steel set screws!
On another application where a set screw clamps down on a thread, a nylon pellet gets dropped under the set screw.
 
A center cutting carbide end mill will go through that set screw like butter.

Ted
 
The less expensive import screws may be easier to drill? McMasters sell the set screws with nylon tips. Not sure which sizes.
Can't imagine that a carbide drill won't be able to cut through a set screw.
 
Well, what I did worked. That being said, I didn't like the way they came out so I am going to re-do them after I correct an issue with the Morris taper drill chuck.
Went ahead and order some stainless set screws, got it my head to make these rather than just buy them!
 
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