Drilling and tapping spider

  • Thread starter Lucky Shooter A
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Lucky Shooter A

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I'm looking for some basic machining advice.

I've turned a spider sleeve and the time has come to drill and tap it.

I don't have a mill, only a drill press. I've scribed the hole centers to the best of my ability using the squares I have.

Should I drill each hole independently----4 holes---or should I drill them in opposing pairs, going all the way through with each hole ?

What would be the best method, considering what equipment I have ?

Thanks.

A. Weldy
 
Lucky Shooter A said:
I'm looking for some basic machining advice.

I've turned a spider sleeve and the time has come to drill and tap it.

I don't have a mill, only a drill press. I've scribed the hole centers to the best of my ability using the squares I have.

Should I drill each hole independently----4 holes---or should I drill them in opposing pairs, going all the way through with each hole ?

What would be the best method, considering what equipment I have ?

Thanks.

A. Weldy
Click to expand...

Use the jaws of your 4Jaw to check the indexing of 90 degrees. I'd drill all the way through. Work carefully and bolts should meet pretty close. The trick is starting drill at TDC and having opposing holes square to table and quill of mill/drill press.
An indexing head would be nice but not essential. Machined jaws of your 3 and 4 jaw help index for 30, 60, 90, 120 degrees.

Semper Fi,

Wally
 
If you don't drill them all the way through to make two opposing screws, you can wind up with opposing screws that are offset. Offset screws will cause you problems when you try to adjust your barrel. If you are using a spacer to hold your piece to drill the holes, then it doesn't make any difference.
 
Thanks for the replies

After a close look at my old drill press, I don't think I'll be satisfied with the job it does.

Think I'll get it done on a mill.

A. Weldy
 
It's relatively easy

to do what you want to do on your drill press. Just go all the way through, as others have said. Then, either use the same drill or a piece of round stock, measure under whichever until you have it 90* to the first hole. Drill your second hole and use your press to assure you tap the holes straight. Mebby there is a Youtube of someone doing this you can watch. Youtube has more instructional stuff to watch than one has time to see.

Pete
 
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